I have the 89 camaro 305 TBI

If I bought the 142 blower for this engine, which one from the summitracing.com would I need? I do have a serpentine belt.

I understand the 4" cowl hood I need.

also Would this blower be swappable to my 350 TPI I will be building soon? or should i wait on the blower till my 350 is done? thanks!

 

When you bolt on a 142/144 roots blower it basically IS your intake manifold. It is in no way compatible with a TPI. It's not really even intended to work with TBI exacept for a kit they make for mid-90s TBI truck engines, which might be able to be be adapted for use on a 3rd gen TBI Camaro. I'd call Holley and ask them for their advice.

Bolting it on top of your motor and making the blower drive fit should be realtively straight forward (Weiand 142 extended long nose version will bolt on). Making it work with the TBI system on top and metering fuel correctly- a whole nother' ballgame.

 

oh, so i would need the longnose version? because of my serpentine belt correct?

I guess I could go carburated if that means i get to use my supercharger, i assume it is easy to go from TBI to carb?

 

i used a short snout (short waterpump style) 144 and eliminated the factory gm tensioner, used underdrive pulleys (crank under pulley is about the same as the sc pulley) and tension the whole thing with the s/c tensioner, i only had to space out the s/c pulley and tensioner 1/8th oe an inch.been running this for 2.5 years now without a problem,i did convert over to a carb though... email me for pics at rory@net2music.com

 

HERES APIC




WELL THAT DIDNT WORK

 

There's 3 versions of the 142. Short snout, long snout and extra long snout. The short snout is for early applications that use short-style water pump and 2 v-belts maximum (you won't find this on anything in the last 20 years except maybe a 'Vette). Long version is for long style water pumps and 3 v-belts maximum (real common through the 70s and early 80s). The extra long version is for STOCK GM serpentine belts and some later-model v-belt engines that used 4 v-belts (4th being for the smog pump).

My 78 Malibu that uses a 3 stock v-belt setup (Alterantor, P/S, A/C) and a long style water pump has the long nose version installed. It's TIGHT, but it fits without modification.

I have compared that setup with my 91 Camaro serpentine belt TBI engine. It would fit but the blower drive belt would be trying to "occupy the same space" as the serpentine belt around the water pump and crank pulley by about 1/4". That's probably the reason Holley recommends the extra long nose version for serpentine belt applications.

 

RS/SC- I can't find your pics, but did you run the serpentine belt around the blower pulley and drive everythign off a single belt? I'm assuming that's what you did. Otherwise, the "short" version of the 142/144 wouldn't stand a prayer of fitting past stock pulleys/belts.

Please post pics ASAP. I'm REAL interested in how everything lined up. How close was evertything to being "in plane" with the stock pulleys? Your setup could be the answer to a LOT of problems of running the little Weiand/Holley blower on a late model serpentine belt engine. I'm super-interested in your solution.

 

yes i used the factory set up but deleted the a/c completely even at the firewall

 

what kind of power increase is to be expected from the roots blower?

 

Depends on the carb you run (roots blower has to suck air and fuel from it instead of pressurizing it likes a turbo or sc). Also depends on how efficent it is.

The smaller ones are pretty straight forward you can pick up around 100 hp or so from what I read. The big difference is the lower end though, since the roots is ran off the crank and is turning all the time you get more low end tq and the boost builds in a nice upward slope usually. Builds up a lot quicker than a centifugal but the centifugal will catch up with the roots in the higher rpms usually.


Course there's all kinds of other blowers 142, 177, 174, 250, 420, 4-71, 6-71, 8-71, 10-71, 12-71, 14-71 that put out more cubic inch of air just have to get the one that matches the motor.

 

rs/sc- that is really very inventive. I LOVE stuff like that. Did you just stumble onto that belt setup by chance? It looks like the pulleys are almost perfectly in-plane with the stock stuff from the picture. How close are they really? It looks like you spaced the blower pulley (and tensioner) out away from the blower snout about 1" (it's not right up tight to the snout like mine is). What sized belt did you use?

Also, I have an observation about your air cleaner setup.... I tried exactly that on my 78 Malibu with equally tight hood clearance. The K&N Xtreme Flow lid hurt performance more than it helped in my case. Yeah, it flows air, but the inside of the lid with the drop base put the lid's filter pleats (that stick down about 3/4" inside the lid) REAL close to the carb's inlets. So much so that it choked airflow, despite the greater filtering area. If you're at the track sometime you might want to try some back-to-back runs between that lid and a plain stamped steel lid. You might be surprised at the results. Airflow is good but having room above the carb for the air to "straighten out" before it goes through the venturis is just as important. Something to store in the old memory banks and try out later, maybe.

 

yea i see what you mean about th filter lid, as for the pulleys there only spaced out mabey 1/4 of an inch. i originaly came up with the idea after i had a short and a long and placed each one on an old lg4 i had and realized it wasnt that far off from thwe orig.serp set up. i then got the march underdrive pulleys due to the fact that the original pulley would create way too much boost,the march is within 1/8th in size to the weiand pulley.i have a buddy who owns a speed shop so it realy was great to have both types on hand to try, this set up also gets rid of all the crap on the rightside engine bank...

 

hey damon if you want i can email you a dead on pic of the pulley and belt planes to see how inline it is...

 

Yeah, a picture would be great. My email's in my profile. I'm putting all this into the back of my brain for a future project. I happen to have a 92 Camaro with a TBI engine that's getting swapped for carb soon (and uses a serpentine belt setup like yours). You got me thinking.

 

Hey...I'm looking to put a 142 on my L98. My motor is already carbed so I figure im halfway there. Should I be looking at a long nose or extra long nose?

 

im using the short nose as you see it pictured here...

 

I would love to see the pics, but they are not working. Could someone please fix them?