JP86SS

iTrader: (1)

I feel kind of stupid asking but I'm trying to not screw up my combo and maintain good all around driving with it.
I found a deal on a Crower cam and am wondering if I'm limiting my potential by using it. Its only a 214 with 114 LSA.
http://www.crower.com/misc/cam_spec/...01LM&x=27&y=11
My original plan is to use the LT4 hot cam of 218 but that may not be what I should do. The 110 LSA has me worried that I may need to bring the idle up to 800-900 to keep things smooth.
i'm really not too worried about the idle because I like it at 750-800 now.
I realize that the exhaust port on my heads (-1's) are going to limit me a bit on top end so I opted for a full 3" dual X setup (but stayed with 1-5/8 primaries for some dumb reason, probably LE torque)
I am still pushing for 12's out of this heavy beast and don't want to kill to much on the low end and am hoping the 114 LSA will help with that as well as a flatter curve.
HSR, 30# and open breathing is the plan.
As it stands now, the motor lives at 1800 and up for "normal" driving so I guess going to the LT4 would hurt me.
Somebody give me a push in the right direction, I'm probably over anylizing this and should just do what my gut tells me and get the LT4.

Z69

A 114 will take some torque off the peak and move it up towards the HP peak. Basically making the power broader.
Also, it moves the intake closing later which will help the top end more. Especially on a small cam like your 214
But with a low CR motor it will also lower the dynamic CR and lower LE too from CR loss. In short, on a street car, the smaller the cam, the tighter you want the lsa for midrange torque.
When comparing cams, look at the .050 and .200 #'s. The higher the .200 # for the same .050. The faster the lobe is.
The LT4 I'd imagine has nice slow ramps for long term reliablity. Helps it rev with oem lifters too.

With stock heads I wouldn't go more than .500 lift or about
220@.050. Or you simply trade 2 ftlbs at 2500 for 1 at 4000 for a simple anology. With a 220 having a 114 lsa.

-email me all your specs John-

I thought the LT4 was on a 112?

JP86SS

iTrader: (1)

I guess I'm camfused at the moment

Z69

The LT4 is about 4 deg bigger than the crower and will have about 8 deg more overlap. The crower will probably work with your current springs.
Unless you do a lot of city driving I'd go with the LT4. It's a much better match to your intake. If running 1.6 rockers, you may need a spring upgrade. Since's it's your money, I like the comp 26918 or whatever beehive springs. Oh, I like those crane $375 HR lifters too.

Now you know why I'm running a solid cam....

JP86SS

iTrader: (1)

Ok now I'm really throwing options out there. The wad of $ for this year is growing smaller by the minute and this is the last piece of the puzzle for me
When I installed the heads I did not insure the pushrod holes would be ok for the 1.6 rockers and I DO think they will be rubbing. I'd like to stick with my Harland 1.5 rollers for now anyway and save.
The heads are these:
011250-1 Hydraulic Flat Tappet Camshaft (Straight Plug, 64 cc Chamber, Cast Iron)
I can't find any info on how much lift I can go on the springs that are on the Sportsman II heads. -1 Heads use a 1.250 diameter spring. Seat pressure 100 lbs. @ 1.825 Replacement part # 830105. Retainer part # 830205
I believe the 1.825 is the installed height but that doesn't help me.
The CompCam HR276HR (224/230, 110 LSA) looks like my next best candidate but am not sure on the 0.502/0.510 lift being ok.
A little more aggresive but like I said before, the motor rarely is below 1500 when I'm moving.
I'm really open for constructive critizism here (or non, I just want some insight from people who know better)
TIA,
Jp

Z69

Here's something to keep you up at night.
DCR calculator
Download the calculator and start playing.
Shoot for 8.0.

Valve Springs are more a cash concern than anything else.
I'd call World and ask them. Or Mondello since they are buddies. I'd think that .520 would fit.

Wonder when Joe is going to shut this down?

Rick King

I know that you know this
1. All the hp or tork in the world will do you know good if it is just smoke (tire spin).

2. most us us tend to overlook the capabilties of our chasis to what ever car we are building, myself included.

3. I would make sure that my car will hook durring the launch before going bigger. I learned this lesson a long time ago and kept making the same mistake.. I took the 350 (330 hp) out of the ELky(has 3:73 gears) and put in a 210 hp 305 and the car went quicker because I do not spin the tires as bad---dosen't that kill the normal.................................................... thinking............................................................................
the ricers could not belive it when the saw they where beat buy a 305 with stock exaust and a stock 1972 elky chassie. I will up grade the suspension before I make more hp.... I am old and finally learned


GB

rick

3.8TransAM

Hot cam was a pretty decent cam for me, managed about 20ish with mixed hihg/city driving too.

I would try and find one of the new comp cams with slightly less spread between intake/exhaust

They have tons of stuff in the 214-230 range now in all kinds of intake/exhaust durations and lifts.(the old stuff and now the XFI stuff)

Wouldnt mind something like 218-224 w/ around .525 for my car now but it would be splitting hairs at this point and only slight step up from where I am at on the Formula now.

Take it for what its worth

Jeremy

vernw

iTrader: (2)

The Comp roller in my 383 is 218/224 @ .050, 112* LSA, and .495/.502 w/1.5 roller rockers. I've got 1.6 on the intake side, so I'm getting .525/.502 @ .050

I got some Comp Pro Mag steel 1.6 rollers for all the way around, but they were so noisy I (and others) thought I had a bad lifter after only putting them on the driver's side so I took them back off.

The cam seems like a fairly nice setup on my SuperRam, but I just started my WOT tuning though.

JEREMY - ever find a PC file transfer method?

JP86SS

iTrader: (1)

I should have put this under general.
Thanks for the link, I'll be playing for a while with it

VernW, your running the same heads so I'd have to say I'm ok on the lift so that removes that worry.
You guys are right, I really need to do more homework and figure out something 1n the 218-220 range.
Seems like the best fit for me even though I may be leaving some top end HP on the table. With that setup I could reduce my low end timing possibly to reduce power and get decent launches but that will take some playing to get a handle on it.
Thanks all!
Ok, you can kill it now

vernw

iTrader: (2)

SAME HEADS --- except mine do not have World's springs. I'm using Comp Cam springs. Don't have the part number of them handy, but can probably get it if you need it.

3.8TransAM

http://www.cranecams.com/?show=brows...tType=camshaft


For what its worth thats the cam I run in my Vortec headed 383 with TPI. I am running it with 16.rr however.

And motor has a whopping 8.7-1 compression ratio :-) Cam specs and engine build were both geared for future turbocharging, so I know I gave up some on cam and compression.

I can make up for it with 12-15psi I think.

Looks like it will get Stealthrammed once I can get a vortec one again thou. Dropoff at 5k like a rock :-(

Lots of fun until then and pulls like all heck

later
Jeremy