I don't know how well this is going to work but I picked up a P600B Procharger with about 10hrs run time cheap. I have a 420sbc stroker with a roots 177 on it making 6psi and I want to try the centrifugal on it. I know the 600 is pretty small but I'm not looking for a lot of boost anyway. If I can get 8psi out of it, that would be plenty. It was on a stock BBC making 10psi. My combo is:

420sb 8.82:1 CR
GM 509 Block
4340 3.875 stroke
Ross -34cc pisons 6.0 H-beam rods
Brodix Track 1 221cc heads 67cc chambers
NX274 CompCam 230/244 @.050"
Victor Jr intake Proform Race Series 850dp

I need to build or find a SBC bracket/pulley for it since it came with BBC brackets and 12 rib crank pulley. ATI recommends a 2.75 blower pulley. I seen a lot of problems with this charger concerning belt slip due to 3.05 step-up in the transmission. Other than that, they seem to make power.

If I like the centrifugal I may sell the roots and P600B in favor of a D1. I can't make too much power due to the 400 block and the issues they are notorius for. (ie. cracking, busting, etc.)

Should be interesting to see if this 'lil' supercharger can feed these cubes. Got to start hunting/building parts first though.

 

haah not a chance..way to small. I think even a D-1 would be a bit too small.

 

I would not expect 6# boost with a 2.75 pulley.

Lonnie

 

That might not even make positive manifold pressure at all on that motor.

Your best bet is a D1SC or an F1.

 

You all may be right. I have talked to a few people that has or still is running it and the concern seems to be mostly on belt slip. If I can get it to turn up without slippage, most say it's capable of making power.
Does the P600B flow as good as Vortec V1 S-Trim? The S-Trim was worth 6-8psi on a 427sbc with more cam and Dart 230cc heads. He has since went with an F-1 and a 434sbc due to a valve failure. That F-1 makes 3X more than enough boost to split my GM block.

 

I would think that the S-trim would be better than the P600B, but it might not be enough to feed that 420 like you want to.

However, I like the Procharger stuff much better. If your engine DOES explode, you won't have to worry about sucking debris into your supercharger and ruining that as well, since the Procharger has a self-contained oiling system.

Anyway, seeing that you're from my neck of the woods, why don't you call Futral Motorsports and ask them what they think? They build some of the nastiest F-bodies in the nation.

 

P600B isn't self contained, the P1SC is though.

http://procharger.com/models.shtml

 

Isnt the D1SC bigger than the P1SC? I was recommended a D1SC when I was considering putting some low compression pistons in a 434 stroker... they said it would be fine for 10 lbs easy. So I would imagine on a 420 it would be more than enough.

Yeah you really need a bigger blower for that many cubes. I was considering a miniblower but there isnt any that I know of big enough to feed 420+ ci at 6000 RPM.

 

The P1 SC is about the same as the P600B. It's self-contained and has a better step-up ratio but power wise, not much better. A D1 SC is what I need, just can't swing it right now. I'd rather upgrade my block first also. I have a 177 mini blower and turning it 2.1:1, it makes 6-7psi @6K~565hp/590ft.lbs. It builds a lot of heat though and power goes away quick.
I'm hoping this little Procharger will make 8psi on the 420. I talked to a guy running one on a 429 making 10psi turning it 45K. Mine will be ratio'd for 51K.

If it don't work out, I have a 9.2:1 355 short block laying around and a set of Brodix -8 heads. As a back-up plan, I'll build that back up with the blower, pull the 420, sell the 177, the Procharged 355, and maybe pimp out the wife for a D1SC or F1 set-up and a Dart block.

 

I'm curious as to how well those 177's would work on a street 434. I know the 122's are too small and I'm assuming the 250s are too big to fit under and SS hood. Problem is a motor of that size can easily make the same power, with a loss of around half it's streetability (midrange setup). A blown 434 could do it with stock type driveability and decent mileage...

Roots is the nuts though, over a centrifugal. Makes you wonder what they could do if they made one of those 'High-Helix' type 177ci mini-blowers... bet that would work fine.

Makes ya wonder doesnt it?

 

If Magnuson would build a 177 the same way they build the 112, I wouldn't be trying to get away from a roots blower. The MagnaCharger is a good roots based charger and they tried to convince me that 8-10lbs of boost would be easy on the 420cid.

I have to run a 4" cowl hood on my '68 Camaro with the 177 and a compromised air cleaner. I really want to go back to my 2" steel cowl hood. It looks 100% better. I have seen a Camaro with the engine dropped so that a 420mega blower would fit under a cowl hood but I think that was a 6" cowl and it didn't appeal to me. I drive my car and the last thing I need is my headers closer to the ground.

 

You could try an exhaust manifold restrictor system. Good hood clearance, no problems with headers scraping the ground.

 

I'll seve the exhaust restrictions for the LS2 project that I'm collecting parts for.