my88IrocZ

I just picked up a 400 ci smallblock and now want to start to build a supercharged engine. I want to use the 15-20PSI Procharger with 3 core intercooler. What do I do for a shortblock? all forged or not? I would like to make 600+ HP. Also what cam would you use for a supecharged engine? I will be using a pair of trickflow aluminum heads, The rest of it i have no Idea, I have never looked into supechargers before but latly I have really wanted one , I love the sound and the big horsepower thay give you!!!! I hope to get some answers from you guys it would help me out a lot, thanks.

Kingtal0n

https://www.thirdgen.org/techbb2/sho...hreadid=144692

Read it and modifiy the part that says "roots blower" to say "centrifugal blower"

Ace_Murdock

i betcha you may be able to squeeze a bit more power out of a centrifugal supercharger. don't they use less power to deliver the same flow/boost as a roots?

my88IrocZ

I am keeping it a TPI does this make a difference on what supercharger i use? Everyone told me not to go to carb it would be a mistake.

Kingtal0n

roots blowers only work with TBI or carbs. TPI requires the use of a centrifugal supercharger. they can make more power but your bottom end has to handle it.

squeezing power isnt exaclty the choice of words. I could have gone StealthRam / Procharger for an extra $5000 on my setup, instead of 21 MPG/500HP i would have 24 MPG/600HP. but this is only because an intercooled centrifugal supercharger setup would take advantage of my blower motor on the street much easier than a roots can, for the simple reason its intercooled. that just means more power.

Non intercooled superchargers? dont even bother. if your going to get a supercharger that actually has to "spool up" then at LEAST have the advantage of an intercooler.

JuicedBird

15-20 lbs of intercooled boost on a fuel injected 400! I think you'll make much more than 600HP. With that setup, forged internals are a must. That sounds great, let us know how it turns out.

True Power

15-20lbs of supercharged boost on a 400cid would be more than sufficient to net you 600hp (done properly, of course). At those boost levels, COMPLETE forged bottom end is a MUST

Kingtal0n

you can make 600 horsepower with less than 10 PSI of boost... just depends on the engine size.

cramming 14.7 PSI of boost (an extra atmosphere) into an engine making X amount of power will technically double that power, minus heat/density losses. it takes about 16-18 PSI of intercooled boost to actually double an engines output. if the engine makes 400 horsepower without boost (easy on a 350 OR 400 block... streetable too) then cramming that much boost will give you around 800 horsepower. easy. now add juice and run some 9's...

this is stuff from ATI's website, not from me.

SATURN5

Hmmm...... For most roots style I'll agree. eg 144,177, 6-71. however my Eaton is a roots blower and its doing just fine on my TPI.

Course my M90 is a tad small for my 305. Bout 4 lbs of boost. But theres more to come...

Kingtal0n

well smarty pants if your so smart how come you have a eaton huh?

cuz if it was me i would havnt eaton, i would have ate. see thats proper linguistics for you.

SATURN5

rofl.. just had to give you a hard time.

Working on putting a second M90 on presently. Just waiting for the materials to arrive. Will post pics shortly..

83 Crossfire TA

iTrader: (2)

Hey SATURN5, how fast are you spinning the first one? Have you done any porting on the inlet?

My brother is seeing about 10psi with his on his 306 (.030" over 302), with big heads and cam...

SATURN5

Crank pulley is 7.5" dia
Blower pulley is 2.85" dia

Gives a 2.63 to 1 ratio

or 13700 rpm @5200.

I start getting boost at 4500 ish, no more than 4 psi. However this is just revving up the motor. I know theres a bit more rpm left, I will probibly change to a 2.5" pulley later. I have not done any porting yet. If I can get some time over at a buddies shop I'd rework em like Mike did.

I got a good deal on the new M90, and I had a second intercooler already. So... guess some silliness took over. I always planned to get a second M90, I just couldn't pass on it. cheers, Bob

83 Crossfire TA

iTrader: (2)

My brother's is pullied 3:1 and he's shifting a little over 6000rpm.

The case that's on it now is actually one of Mike's old cases that we ported quite a bit past what he did. As a matter of fact, the datalogs show that the additional porting got us an an average additional boost of almost 2psi at the same rpm... (we ran it, ported it and ran it again, then took it off and cleaned it up enough more that it needed a new intake to fit the new opening)