I saw a SMall blowwer 144 or 177 somewere a couple years ago for TBI SMall block GM's. Anyone know were to get these?

 

http://www.holley.com/division/Weiand.asp

Scroll down to superchargers and there are 4 SB Chevy SC. A 142, 144, 177, 250, 6-71, 8-71. Thats all of them in order top to bottom, left to right.

 

man I thought they were cheaper than that. Oh well.
thanks

 

Has anyone ever used one of the TBI truck blowers? If so what are your opinions/comments/mods you had to do?

 

I am currently working on a project using an Eaton M90 and adapting that to a 305 TBI. You can pick that blower up at any junk yard for roughly $200 (I've see them aqs low as 50) and Corky Bell's guide to supercharging is like $20. If you use a Ford Thunderbird S/C as a guide car and you aren't half bad at fabrication of custom parts you can have yourself a COMPLETE blower setup for less than $350. Only challenge is tuning!!! You'll need to do all the "Ultimate TBI" upgrades first including fuel pump from a TPI car, and you need Injectors Larger than the ones found on the 454 TBI. But it can be done! Mine should be done in... well, lets not get ahead of ourselves :-)

 

3rd-gen junkie, are you making it into a blow-through setup ? i.e. like a centrifugal s/c or are you making it into a roots style blower setup ?

 

Roots style, air to air intercooled, blow thru TBI
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The best of both worlds, using a roots like a centrifual. Dual roots is down the road...

 

1 M90 is going to be REALLY working to try to feed a 305. the M90, run's at about a 2:1 drive ration, that gives you 180ci of air per revolution. Even being gneration, and saying the 305 need only 85% its CID in air-flow, that means we need 130ci of air per revolution. that gives us about a 1.3 pressure ratio. BUT WAIT, there's more. I don't think an eaton will even do 70% effeciancy, but we will go with that, at 70% effeciancy (it creates heat to pressurize air, as you heat it, you get less density), you end up with a .96 pressure ratio. I really don't see a single M90 making over 300hp, under any conditions.

A guy with a PAIR of M90's in his garage, just making an observation.

I would also suggest going with EBL to try to get the computer to play nice. Plan on some big injectors, and big fuel presure. Rember, you need to up the fuel pressure in at least a 1:1 ratio with the boost. If you are using TBI, the injectors will be under boost, and if you don't raise the pressure with the boost, you are effectivly lowering your FP as your boost goes up.

On another note, didn't Fast do a 144 on top of the 350 in his van?

--John

 

Yes I DID do a 144 on a 350 TBI in a Van. It was being run by the EBL and a 2-bar MAP sensor. I knocked 3 4L60Es out of it before pulling the supercharger back off of it. This is probably the reason that I could not keep a 4L60E in it.

http://www.youtube.com/watch?v=DPIaLtE_U1I

I backed off around 50 when the rear end started getting a little sideways.

I also did a TBI 305 with pair of ported TBI 350 heads and a Vortec truck cam a few years ago.

 

Well thus far my research indicates an M90 is suitable for all hte way up to a 350. Keep in mind I am planning on using a gen 5 with overdrive pulley. I designed an adapter that only utilizes the blower when under boost b/c of the blow thru setup. As for normal driving car functions like a N/A engine. But as for this van, did you blow thru TBI as well?

But I plan on using fuel pump from a TPI car, injectors from a 454 TBI, and the overdrive pulley on the blower. A friend who does M90's on 3.8L cars is pushing up to 15 pounds from his M90 setup... I am expecting 7-8 pounds max. All calculations were done using Corky Bell's formulas. ADVICE AND TIPS ARE GREATLY APPRECIATED.!!!

 

No my 142 was draw through but the fuel pressure was boost referenced. 15 PSI @ idle, 23 psi with the vacuum line off the regulator, and about 30 PSI at 7 PSI of boost. It drove just like a normal van, until I layed into it. At 1/2 - 2/3 throttle not in PE the transmission would flare between shifts pretty bad.

http://www.youtube.com/watch?v=JwWio6o9NHQ

Also keep in mind that this 350 has Stock HD swirl port castings, Peanut Roller cam, and cast iron exhaust manifolds at the time.

 

So Fast, if you had a stock 350 TBI like me, what would be the parts that're required to install a supercharger/blower and have it run smoothly? (To the best of your knowledge, now that you've completed it once) I could never affored this, so I'm simply wondering.

 

i think im just gonna stick a carb ontop