Drac0nic

Worse comes to worse if you have a blow through (centrifugal) blower you could probably pull the belt and drive it, the blower would be a restriction but it'd allow you to have a car that'd be a lot less likely to kill you in the rain even though it'd probably run rich due to the tune being off.

DIGGLER

iTrader: (1)

.....or you could just not floor it while your driving it in the rain.

shinobi-x

I made that with my 142 blower. It won't be hard with a 177. Trust me...You'll love the torque off idle. A 177 isn't small for a 400cid either. A local guy runs one on his 10 seond 406 77' Camaro. Very impressive blower for $2100

Sonix

iTrader: (1)

I don't think he's concerned about driving in the rain because of loss of traction, I think the point was pulling water into the intake of a blower, and trying to compress water instead of air.
I think it'd have to be raining GALE FORCE to matter.

Confuzed1

iTrader: (4)

That's really tempting me now....I'm holding off buying anything until I can figure out if the Weiand 177 I want to run will fit under a 4" Jongbloed or cowl hood. By my measurements, it's close....real close even with 4" added hood height. I wanted a 5" Jongbloed, but I've since found out that there is a state law says I can only have a max of 4" hood over stock height. And they say the police around here will pull you over and measure it too!

So - big cowls and the 5" Jongbloed hood is out of the question. By my measurements, as I said earlier my post, the intake and blower itself has a decent shot at fitting under a stock hood or close to it. - without a carb and filter on it mind you.

Add the carb measurement - 31/2" , that seems to put me within 1" of hitting the bottom of a 4" cowl hood, so that may be too tight. I'm glad this is an all - winter project, and I have time to sift through this stuff. Keep the post comin! It helps me alot , since some of you guys have blowers on your 3rd gens.

How close is that 142 blower from the top/underside of your hood shinobi-x - or anyone else running one on a thirdgen?? I'm really interested, because it'll help me figure out if a 177 will fit possibly. Wow shinobi-x, you made 500 RWHP with a 142? You sure it wasn't FWHP? I'd need around 600 FWHP to make anywhere near 500 RWHP. If that's the case, I'll just slap on a 142 and forget about it! It's 2" lower than the 177....

Oh, and I don't plan to run it in the rain anyway. I have my 4WD S-10 for that! lol My Z28 is my own personal money pit/toy car. I mentioned a supercharger to the wife, and she said something about a "mid-life" crisis.....

shinobi-x

I was hitting 10psi boost on the 142 and 850cfm Proform Race carb. It was running 11.9 on the street with GTEC PRO at 116mph. Very impressive little blower and I had a simple yet choking exhaust system too. Shorty headers and full 22" long mufflers and tail pipes. Remember this is in a bulky 69 chevelle with bench seating,sway bars,powersteering,not slicks but drag radials. Very tame combo,freeway friendly too.

dennisbernal91z

iTrader: (2)

I love this thread and just want to subscribe cuz I have a 386 that is a little under powered and I have no idea why. Only pushing 344 to the rear wheels. I have always wanted to have more like 500. My main problem is that it is my DD for 3 seasons and I don't want to have a MPG drop through the floor. Oh and I don't want to tear my motor appart.


Oh crap, my head is filling with questions.... I better start a new thread for me, LOL.

Good luck with your build, I will be doing something soon if I get bored of N20.

Confuzed1

iTrader: (4)

Shinobi-x:

After I made my previous post, I looked at another post I had on this board about hood clearance and you referred to the Magnuson 122. I didn't realize they existed until today! But it looks alot more promising so far as hood clearance goes. It measures 9.3" from the top of the block to the top of the blower. Certainly better than the Weiand 177 at 10 15/16ths" from the top of the block to top of blower....

I might even be able to run a respectable air cleaner under say, a 4" cowl or Jongbloed hood - just maybe. Even though it's a smaller blower (122 cu. in.) - it's a cooler charge due to the Magnuson rotor design, so that *MIGHT* make up for it, if you believe thier dyno tests on the website. It's a bit more expensive, but price has never really been a "show-stopper" for my forced induction project - but ease of tuning, minimal modifications and reliabilty is. -Along with my goal of close to 500 RWHP.......Thanks for the tip - I'm starting to look into Magnuson now!!

P.S. - And honestly, if I can't find a roots style blower that'll meet my goals (without having to run an "outlaw" type hood) , then centrifugals will be next on my list. But I already know that if I end up choosing a centrifugal like a Procharger D series or a Vortec S trim, "minimal modification" and "ease of tuning" will be out the door. No doubt either should easily meet or exceed my power goals - if I could ever get it tuned right to be streetable on a carbed application.

Sonix

iTrader: (1)

In case you haven't seen this before;
http://www.carcraft.com/featuredvehi...evy/index.html

I'm not sure that would flow enough air for what you want... Size wise, it wins, but airflow?

hmm...
http://www.youtube.com/watch?v=N4l642TnA2c

Confuzed1

iTrader: (4)

Yes I read the article, and just watched the vid. If I heard it correctly, it was a 122 Magnacharger, on a 404 inch LS2. Seemed to feed it fine...700 some-odd lbs. of TQ oughta gitterdone! They claim it'll feed up to a 7 liter engine. And I'm as skeptical as you are Sonix, since it's even smaller than a 142 Weiand!?!

So let's see....My engine makes 400ish tq already N/A - what will my tq be with a blower? -And don't think I didn't look at the Procharger vid too!

shinobi-x

I bought a mag 122 for my 69 chevelle,i no longer run a 142 and haven't installed the mag yet. Definately a big increase in technology from the 80's design of weiand mini-blowers! The weight difference is better too! I should make the same power as the weiand but with less boost. I must get some install pics up soon when Im ready to change cyl. heads.

Confuzed1

iTrader: (4)

shinobi-x: If you don't mind me asking, where did you find a Magna Charger 122 H at? Only place I see it is on the Magnuson website - is that where you got it?

And do you know if it works with a 3 V-belt system?

shinobi-x

Ya know what,i don't know if it will work with 3v belts or not....That is one to ask the boys at Magnacharger. I did buy direct from them aswell.

Jegs offers the Edelbrock E-force supercharger for SBC's which is the 122H by Magnacharger. its $3066 for the satin finish and standard SBC heads too. Might be worth it do just go from jegs. Shipping is easy and cheaper to ship and they might have some in stock unlike my 2 week wait

Confuzed1

iTrader: (4)

Thx for the vid shinobi-x, your Chevelle is pretty impressive!! I tried calling Edelbrock but after waiting 15 minutes on the phone I got tired of waiting and just emailed them....still waiting on a reply if the MP 122 will work with 3 V-belts.

Waiting is no problem since I'm just starting to take the engine apart to set up for boost. I most likely won't need the blower till early spring sometime.

As I mentioned in one of my other posts on this board, I'm sticking with the "roots" style blower, because I believe that's where I want my power - from idle to 6K rpm's. And after additional measuring, it looks like the only two blowers that I can put under a 4" cowl is either the Magna Charger MP 122 H or the Weiand 144.

So -I'm finally down to two choices. Feel free to post up which you'd choose and why. I see advantages/disadvantages to both myself. Here's my take:

Weiand 144
Good =
-Lowest "underhood" blower available - plenty of room under a 4" cowl
-Has 144 CFM, which is more than the 122 at least
-Cheaper
Not so good=
-Have read complaints about the belt drive
-Not a very efficient design
-doesn't have a bypass

Magnuson MP 122
Good =
-More efficient design
-Has a bypass
-Seems to be built more rugged
Not so good=
-Should still fit under a 4" cowl, but it'll be closer
-Only puts out 122 cfm
-About 1K more in price than the 144
-May not work with 3 V-belts? (I'll know soon for sure I hope)

So again, which would you choose. Remember, I'm trying to feed a 400 SBC and most companies only test these on 350's. Thx in advance for any responses!

dennisbernal91z

iTrader: (2)

I would def go with the more efficient one. It might be a bigger pain to fit in, but the added tech from the newer design can't be beat.

JPTINMAN70

Confused,
I think you are a bit "confused" by the nomenclature used to describe the Magnuson & Weiand blowers. The 122 is a refernce to the size of the blower not the CFM capacity. The Mag MP 122 flows much more that 122 CFM. I would imagine that it is capable of more like 1000 cfm or so at a reasonable rotor speed. The 144 is larger in volume than the 122, but the flow is directly related to rotor speed. On a side note, a typical centrifugal supercharger flows 1000+ CFM.

You really want to run a larger blower (if underhood space permits and you need the airflow) to reduce the ambiatic effect of the air compression that occurs within these units. A larger volume blower (177 as opposed to 144) will turn slower to produce the same boost in an engine with much less heat.

Efficiency also comes into play here as I understand that the tolerances and therefore efficiencies of the latest crop of "small case" blowers, like the 122 are far better than that of the old school 6-71s ect. This would equate to more cfms at a given rotor speed and less heat added to the intake charge.

The old style 6-71 blowers are famous for eating up pistons and head gaskets due to detonation which is caused by the intake charge being super heated by the blower. At the extreme, fuel ignites on the compression stroke prior to the plug firing. This is a bad thing.

You want to size your blower to your intended motor size and RPM range. I do understand that the 122 is capable of 500 hp in a 350 ci motor without spinning too fast. Remember that rotor speed = heat added.
With that in mind, if the 122 is capable of producing enough boost at a reasonable rotor speed then that is a large enough blower.
The 144 is marketed toward larger ci small blocks. The 177 is usually found on big blocks to deal with their larger air volume requirements.
As far as what blower to go with, if the new 122 can produce the necessary boost, you will be much better off with the smaller and lighter unit.
Less weight will make your car faster, handle better, and stop more quickly.
The high positioning of the added weight of a blower is very noticeable.

JP

Confuzed1

iTrader: (4)

JP - Thx for the response, Please refer to the Car Craft article link posted above. They refer to the MP 122 blower - and I quote: "Magnuson's new High Helix, 122ci displacement supercharger is about to set the boulevard on fire". -So I'm not making that up, but maybe Car Craft is wrong because in the actual Magna Charger literature I found, it doesn't say what CFM or ci is. But I do know a blower will pack more cfm of air per cu/in of air at sea level into the cylinders, so maybe I'm "confuzed" once again! lol...but your explanation helps!

It makes sense that CFM would be related to rotor speed. But why does Weiand claim 144 CFM from theirs then? Can't it be spun faster to get more CFM? -I already know for a fact that 8 lbs. of cool boost is much more useful than 8 lbs. of hot boost, so I agree totally with you.
So, it sounds like:
-Both JP and Dennis chooses the MP 122. So 2 votes for the Magnuson.

So far....

dennisbernal91z

iTrader: (2)

Screw it all and play with spray

just kidding...

Thats what I am doing

Confuzed1

iTrader: (4)

It's the quickest way for sure! I'm looking for full time power though...

dennisbernal91z

iTrader: (2)

yeah, mine is my DD right now. almost 400 RWHP is good for me, for now. Once I get out of school and get a second car, BAM, I am going to go S/C and booste this thing. Right now, gas is too much and I drive her too much to afford the gas of a 500 HP motor.

shinobi-x

mp122 is the way to go for efficency and all around better power. Im hoping to install my mag 122 soon. Im saving for the heads and bigger carb right now so it will be while before its in the works.

Thats too bad magnacharger doesn't make a larger 170cid blower for the bigger badder combos. If that 122 makes almost 600hp from a 406 in a previous mag aritcle can you imagine what a larger design can do!!! I'd buy that one instead!

Confuzed1

iTrader: (4)

Damon chimed in on another post of mine, so that's three for the MP 122. Since no one has responded since then, the MP 122 wins by default!

sinobi-x: I'd like Magnuson to make a bigger version too....but that's a double-edged sword when you have a thirdgen - it probably wouldn't fit under the hood! But I think I'll end up getting the 122.

On another note, I checked with my local machine shop (they just got a Mustang dyno) , and they say it'll cost 125 per hour to dyno tune it, plus labor and any parts. He says it'll most likely end up being close to 600 bucks for them to set the timing and A/F ratio for max performance.

That sounded about 200 bucks too expensive to me - sounds like they're workin hard to pay off that new dyno....is that the going rate in general? I've read too many horror stories about others that tried to home tune their new boosted engines just to have them blow up due to detonation or running too lean - I don't want that to happen!

Dennis - You got the right idea - get out of school and get another car so you don't have to count on your thirdgen every day. Then it's open season and you can still get to work every day! Not to mention, it allows you to the time to do it right....

shinobi-x

The above in bold something important to address here. Sometimes I wish I dyno'd my car but its no big deal. Getting the A/F ratio (tune) right is extremely important. I went and bought a INNOVATIVE LM1 WB 02 kit which allows you to see your engines true A/F ratio. Best $350 bucks i've ever spent besides the supercharger. It will tell me so many things(not the future,damn!) about what your motors doing and thats what you need. You can tune it yourself with changing jets and altering your own timing advance,etc,etc. Might think about the LM1 WB 02 unit and consider doing it yourself. Its easier than you think and theres plenty of us guys on this forum who can help answer questions.

Don't get me wrong,I'd love to get a dyno tune session myself,just don't the cash and dyno around to do it.

allend43

I RUN A 177 ON MY 77 CORVETTE AND I CAN TELL YOU TRACTION WILL BE YOUR BIGGEST PROBLEM! MINE RUNS ANYWHERE FROM 12.30S TO 11.30S@ 118MPH AND THATS WITH THE BELTS FLYING OFF-- TAKING THE BLOWER BELT OFF WITH THEM, SOMEWHERE DURING THE PASS. SPINS THE DRAG RADIALS LIKE THEY WERE REGULAR STREET RADIALS.I RUN A 406 WITH 9 TO 1 COMPRESSION NO PROBLEM ON PUMP GAS. I RUN THE BLOWER 210 PERCENT OVER. I HALF FILLED THE BLOCK WITH ROCKBLOCK AND IT NEVER GETS OVER 190 DEGREES AT THE MOST-IF THE BELTS STAY ON. HOPE THIS ANSWERS SOME OF YOUR QUESTIONS.

Confuzed1

iTrader: (4)

Been kinda busy lately....

I want to thank everyone once again for all their advice/tips!

The engine is now out of the car, and I'm tearing it down just to make sure it's ready for boost. I'll be adding forged pistons and getting my compression in the 8.5:1 static compression range.

I've really had a TOUGH time deciding what type of blower would fit the bill better on a car driven 90% on the street - roots or centrifugal. I didn't think it would be that hard of a decision, but it is - at least for me. The Magna Charger MP-122 seems like a neat little blower to me, and that's most likely what I'll end up getting.

shinobi-x - I've decided for sure that I WILL be getting the WB O2 kit. Once I think I have it tuned right, then I'll have a chassis dyno done. BTW, I finally got a response from Edelbrock, and they claim my 3 groove crank pulley will work with the MP-122 blower, or any setup requiring the long water pump if running stock pulleys.

allend43 - I took the Weiand 177 off the table as soon as I determined I'd need a 6" cowl, or I'd have to cut a hole in my hood. -If I'm cutting a hole in my hood, I'd just get a 6-71 blower and be done with it. But I don't want to be a cop magnet every time I drive the car.

rmmstnr

Would the same be true if you were using a birdcatcher scoop?

Oh, and Confuzed1, just for the heck of it, you might wanna read this: http://www.holley.com/data/Catalogs/Superchargers.pdf . It has all sorts of stuff you'd need to know about dropping a blower on your engine, and I think the section on Blower Drive Ratios (page 78(18/90)) would be a particularly important section judging by the size of your engine and blower choices. For just over 7psi with a 144 on your engine, you'd need a drive ratio of 144%, not good for heat or overall durability, especially if you wanna touch 6k rpm every now and then. Not horrible, but not good for a DD. Sorry to muddy up the waters.

Also, the 144 stands for cid for the Weiand blower.

Confuzed1

iTrader: (4)

rmmstnr - Don't worry, you're not "muddying" up any waters here. As mentioned above, I'm going with a Magna Charger not a Weiand. Due to the advanced helix designed rotors on the MP-122, it should be a cooler charge at all rpm's as compared to any non-intercooled Weiand.

I won't be up to 7 pounds of boost with it though. The most Magna Charger says I'll get out of their MP-122 is about 4-5 pounds. But - I should be able to make more power with 4-5 lbs. of relatively cool boost as compared to 7 pounds of hotter boost from the Weiand I figure. And yes, it's supposed to be for engines up to 7.0 liters.

-But thx for the link...I hadn't found that one. I'll look through it!!

shinobi-x

You can make as much as 12psi out of the MP122's. It can handle it

Confuzed1

iTrader: (4)

You can? You mean there are different sized pulleys offered?

I emailed Edelbrock, and they didn't mention that. When I asked about changing pulley sizes, they just said that they don't recommend it. I also had them send me a PDF file covering installation (just researching) and it doesn't refer to optional pulley sizes - here's what it says about boost:

"The E-Force Supercharger Kit is designed and intended to produce approximately 5 lbs. of boost on a street/strip modified 350 C.I.D. small-block Chevrolet engine."

So if they DO offer different size pulleys, I'd like to end up with 7-8 pounds. I think that'll be enough if the charge can stay cool enough not to cause detonation....maybe.

-Where did you find the optional pulleys for it?

1fas92

iTrader: (1)

Hello,
I have a Vortech V1 S-Trim Supercharger for sale, if your interested just let me know.

There is a link below.........

Thanks
Robbie
1fas92
https://www.thirdgen.org/forums/engi...v1-s-trim.html

shinobi-x

Magnusun makes a 2.70 inch upper pulley and the top one is 3.25. It will give you a big jump in boost. They make different pullies and just think of how the guys in the 03-04' cobras and lightning trucks change pullies

Confuzed1

iTrader: (4)

Well, they didn't tell ME that nor do they list them anywhere I can find. I spend the extra time to explain to them my particular setup, and what I'm looking for as far as boost, and what do I get told? "changing pulley sizes is not recommended"...

Geez, I'm really getting tired of these so-called "tech reps".....I call, email them and they just recite what I can read myself on their website or install instructions - BS.

Do they assume all the blowers they sell will end up on a completely stock 350 cubic inch engine? - Or are they really that clueless? From what I've seen, any schmo can be a "tech rep" - just memorize the install instructions and what's on the website and you're hired!

But I bet the guys in the Cobras and Lightning's void their warranty from both F*rd and Magna Charger when they install those pulleys.

Confuzed1

iTrader: (4)

OK - Something's wrong here.....I emailed the Edelbrock tech guy, and without pasting the whole letter, here's a cut of it:
There's a possibility that maybe Edelbrock doesn't currently sell any additional pulleys, but maybe Magnuson does. I'm checking into it.

Confuzed1

iTrader: (4)

Well - Here's an "official" response to my question about trying to make 550 plus HP with a Edelbrock E-Force blower on my 400:

"Our supercharger is a 4th generation and we do not feel if would give you the horse power numbers you are looking for. It will probably be best if you were to go to a larger supercharger. And a HEI distributor will not fit with our supercharger."

Confuzed1

iTrader: (4)

Just an update for anyone considering this blower (like me)

I was really opting to not get this blower at all after the email I got from Edelbrock (above), but I decided to try and call and guess what? I finally got ahold of a REAL person at Magnuson on the phone for the first time in 5 tries! Hooray!! Up to this point, it's been all answering machines. Here's what I've been told and/or found out:

-Don't bother asking Edelbrock - they are truly clueless about these blowers, although they sell them. They were only correct about one thing - you can't use a large cap HEI with the MP 122. So I guess my almost brand spank'n new MSD HEI is going up for sale...

-Additional pulleys ARE available, but you won't find them on their website. You need to get them via phone from Magnuson.

-The blower will work just fine with a 400 SBC. With a pulley size change, I should be able to get 6-8 pounds of boost, no problem. If I use the pulleys supplied in the kit I'll only get 3-4 pounds of boost.

-If you want big power in the upper RPM range, this isn't the blower for you. Either get a bigger roots or go centrifugal. They claim all the small blowers start to fizzle out at around 6K rpm's on their dynos.

-The biggest suprise is they say I don't need to lower my compression way down to 8.5:1.......the guy I spoke to at Magnuson said I can run up to 9 to 9.5:1 and STILL have no problems with detonation.....I found that kinda unusual...actually REAL unusual. So I asked twice and got the same answer. (But I still bet I'll have to back down the timing)

That being said, this "Tech rep" says I should be able to get up to 600 HP with this blower (about 100-120 additional HP onto what I have)....and that should meet my goal of close to 500 RWHP (I dunno, but I'll find out)

-Any comments welcome

dennisbernal91z

iTrader: (2)

You have re kindled my interest.

You said you can fit this under what kinda hood? I know it is someplace up in the thread, but let me know.

I have a cervini 3". Prob not fitting right.....

You seem to be doing a lot of research on blowers. Are there any centrifugal ones that make power down low sorta. I hear that they are great for up high.

Confuzed1

iTrader: (4)

Glad I could help you "re-kindle your interest"....
I'm not commiting to anything until I have the blower in the car and measure again. I "think" I can squeeze it under a 4" cowl.
Depends on "down low sorta" is... But yeah, centrifugals generally make big power up high. Boost is progressive with rpm's.

Confuzed1

iTrader: (4)

OK...just checking in. I've made progress. Got the crank and rods at the machine shop. They're going to install the JE forged pistons I ordered, and balance the rotating assembly (neutral) - which pretty much makes the whole bottom end forged, plus I've bought some Total Seal gapless rings made to handle boost. I'll end up with 9.1:1 compression with -21cc inverted dome pistons. That's supposedly a good compression for this blower according to the guy I spoke to at Magnuson's tech dept.

Still trying to figure out a good cam for 2000 - 6000 RPM range....

Also having the block cleaned and re-honed, and all the bolt holes cleaned out. I found I also could use a front cam bearing....there's alot of wear on the lower bearing from the timing chain...already have new rod, main bearings and gaskets from Jeg's. I'll get the shortblock together and I'll order the O2 analyzer and the blower next...

I can post pics if anyone is interested.....

Sonix

iTrader: (1)

Sure that's a good idea? Word on the street was that gapless rings aren't so hot for a boosted engine. I think crossfire_83 mentioned that on here and the feeling was pretty well accepted. Might want to look into that some more.

Confuzed1

iTrader: (4)

Already have looked into it...there ARE some gapless rings that are not designed to handle boost. Usually the ones with the "gapless" 2nd ring. The ones designed to handle boost have a gapless top ring. I haven't found anything contrary to using them. I've yet to run into anyone that's actually used them and had bad results.

I'm not knocking what Crossfire_83 says, he's a wealth of knowledge when it comes to super/turbo charging, but I don't think he's personally used them. I've used the gapless already that's not designed for boost, and I loved 'em.

No worries hopefully, since we called the Total Seal tech dept and told them what my setup would be, and I got the rings they recommended. At 200 bucks, they're not the cheapest, but the claims of more TQ and less blowby are too hard to pass up - esp. in a boosted application...

Sonix

iTrader: (1)

Good enough, just wanted to make sure you were aware of that, as well as anyone who might read this thread later. Nice thing is, they have a small chance of butting together under a high heat load, i'm guessing the "gap(s)" are quite wide.

Confuzed1

iTrader: (4)

Yes, they are wide on the "gapless" top ring(s), but the 2nd ring is a standard ring that will need to be gapped properly for the application. And as with any rings, cylinder wall prep makes it or breaks it. I'll use the "quick seat" power also - seems to work well.

Any thoughts on cam selection? I'll need one soon!

Sonix

iTrader: (1)

This thread is getting bulky, why don't you refresh our memory on your exact combo?

which heads?
final CR?
approximate boost level
current cam
desired powerband

Confuzed1

iTrader: (4)

Sorry Sonix, you're right - the thread is a bit lengthy....

-Heads are Dart Iron Eagles, 70cc chambers, 200cc runners
-Compression ratio (static) should be 9.1:1
-Boost level: 7-8 PSI
-Current cam is a Comp XE288HR (N/A)
-Looking for basically a stock type powerband (1500-6K RPM max)

-Rear gear ratio is 3.70

Sonix

iTrader: (1)

Was this going to be intercooled?

Honestly? I wouldn't change the cam, it's hard to beat what you've got there. You have the 236/242 @.050, and .520/.540" one eh?

Other ones to consider are
XFI280HR-13 (due to the longer LSA it'll trap a bit more cylinder pressure)
this lunati one
http://store.summitracing.com/partdetail.asp?CP=1∂=LUN-50156&N=700%200&Ntt=LUN~50156%20or%20LUN~54756LUN&Ntk=&rsview=sku&Ns=
is ok, wider intake/exhaust spread, but same LSA. ( I can't remember how to make the text say "link" and the link text is hidden. This 80 character long link thing is a PITA...)

For $300 I don't think you'll get $300 worth of upgrade, is what i'm trying to say.

Confuzed1

iTrader: (4)

No intercooler Sonix. I checked out the cams you posted, and they look like decent ones! But from the little research I've done, It seems that I can run a relatively mild cam and make good power. Most say to keep LSA at 112-114 degrees and pretty low duration - I think I need to stay under 230 duration so I don't blow off too much pressure at idle.

Correct me if I'm wrong, but wouldn't I end up having to adjust the A/F slightly rich to compensate?? I'd like a pretty smooth idle with a little lope.

Whataya think of this cam? A Comp 12-415-8 ?? http://www.jegs.com/webapp/wcs/store...0002_107186_-1

Sonix

iTrader: (1)

Hmm, there's a reason nobody uses Jegs anymore, their website stinks. There's no information there at all.

nitrous 276. 224/236 on a 113 LSA. That would work pretty good. It'll just be a lot tamer than what you have now, that's for sure.

Confuzed1

iTrader: (4)

Sorry about the link - Here's the specs:
"Street machine with 125+ nitrous system or small supercharger, 2500+ stall with lower gears"
2000 to 6000 rpm
Dur at .050 = 224/236
Lift = .502/.520
112 LSA

I "mis-wrote" about not exceeding 230 duration above...what I think is nice about this cam is having a 10 plus degrees more duration on the exhaust over intake duration, along with the slightly higher exhaust lift. Should allow better exhaust flow on a street setup - at least it seems that would be a good thing to me.

Does that cam sound good for a blown setup?

Confuzed1

iTrader: (4)

Well, I'll assume it's a decent cam then. I'll follow up with the Magnuson tech rep and see what he says about it I guess.

Even though it seems the responses have been pretty scarce (except for Sonix) - I think there might be a little bit of interest since there's been over 2K views so far. So I'll post updates anyway when I get them. I know this is a lengthy post, but if I start a new one, I'll have to re-type how I got where I am now - which just confuses things. If nothing else, it might help out someone considering this blower.

On another note, I picked up my block, flywheel and newly balanced rotating assy. from the machine shop. Block was prepped for assembly, new forged pistons installed with gapless rings and flywheel was cut and re-balanced (turned out it needed it).

Turns out .030" had to be trimmed off the gapless top ring set...Total seal recommended it for blown applications.

Also, it seems I'll get the blower a couple hundred cheaper since Summit started carrying them!! Jeg's promptly lowered thier price from 3,066 bucks to $2,829....I LOVE COMPETITION!!

Sonix

iTrader: (1)

Yea, I already said it's good, just tame. You'll notice it feels significantly less lumpy, due to the shorter intake duration, and wider LSA.


Hey, it's always nice to get a few hundred bucks off