Hi, 've been planning out a new motor combo and after much research I'm almost deadset on going with an ATI Procharger P600B or P-1SC. However I have a few questions for you blower-experts out there... First off here is the combo I have in my head. Remember this is all in the very early stages I need to do way more research and planning:

Shortblock:
My current 355 which has TRW forged flat tops,
C&A forged 5.7 I-beam rods, ESP cast steel crank,
studded 4-bolt mains, all ARP hardware, Plasma moly
rings gapped for nitrous use

Cylinder heads:
I'm thinking either AFR 195's with 74cc chambers or Dart Pro 1
200cc's with 72cc chambers. With the AFR's my (estimated)
compression would be around 9.2:1 and
with the Darts about 9.4:1.

Camshaft:
I'm thinking something like Crane Powermax solid
grind: 278/288 Adv duration, 238/248 @ 050,
.480/.500 lift, 114LSA. This is just an idea, might consider
a custom grind or even a solid roller.

Induction:
Holley Strip Dominator intake manifold and
(possibly) my current 750 Speed Demon modified for a blow-thru
setup. EFI is out of my budget right now but most definately
sometime in the distant future so I don't wanna hear about it at the moment smile.gif

Now, here comes the questions.

1) What parts would you change? (No I'm not going with EFI!)

2) How much non-intercooled boost do you think I could push on pump gas? I know 9.x:1 compression is slightly high for a blown motor but I'm guessing I could get away with 10-12psi safely on 93 octane?

3) Is the P600B a good choice for a motor like this or should I go a set further with a P-1SC?

4) What kind of power do you think a motor like this could produce? Do you think my bottom end would handle it (considering good tuning)?


Thanks in advance. I'd really like to hear some opinions on a motor like this before I begin making it a reality

-Chris

I've done several ProCharger engines.Here are my thoughts and answers to your questions.

1) What parts would you change? (No I'm not going with EFI!)

Most everything looks okay. A forged crank would be nice but not absolutely necessary. Having the pistons barrier coated goes a long way towards how much boost and timing you'll be able to run on pump gas; I do all mine that way, figure about $250 to have the pistons coated. Again, not absolutely necessary, but it definitely helps.

2) How much non-intercooled boost do you think I could push on pump gas? I know 9.x:1 compression is slightly high for a blown motor but I'm guessing I could get away with 10-12psi safely on 93 octane?

9.2 to 9.4:1 compression is about ideal on a centrifugal street engine. I've run up to 16 psi on 91 octane (non-intercooled) with water injection and coated pistons. 10-12 psi is very doable.

3) Is the P600B a good choice for a motor like this or should I go a set further with a P-1SC?

Do NOT ever run a P600B if the P1SC or other options exist. I hate that blower, nothing but slippage issues when you try to run more than 6-7 psi of boost. The step-up trans in the blower is much smaller which requires a much smaller upper pulley to make boost; less belt surface area with the small pulleys creates slippage. Fought this for a while and I'll never go back. The P1SC is a very nice street blower, better trans, cooler air because it's self contained and doesn't have the hot engine oil running through it. Plus because it's self-contained there's no oil feed and return lines to plumb in the block and oil pan. Will handle 700+ HP easily.


4) What kind of power do you think a motor like this could produce? Do you think my bottom end would handle it (considering good tuning)?

With 10-12 psi you should easily be in the 650-675 hp range, maybe more. One of the members here has a very similar combo and we're expecting 550-600 rwhp on his. A forged crank would be nice, and I'd consider a custom ground roller cam if it fit the budget. However it looks like the above combo would be pretty healthy.

Just finished dynoing a friends 406 with a D1SC, the next bigger blower. With 8.9:1 compression, ported Vic Jr. heads, and a fair-sized hydraulic roller he made 691 rwhp on 91 octane (no intercooler) and 14 psi of boost. He does run water injection though to allow the boost and timing on pump gas.

Good luck with your project. I highly recommend calling Scott at SDCE to prep your carb. He's done a couple for me and other members here, awesome work and very reasonable prices. He can also help with specing a cam and any questions on these blowers. He also beats buying them direct from ProCharger. His site is http://www.sd-concepts.com/

Jody

Thanks that info really backed up what I've been reading for the past weeks. I know my bottom-end isn't exactly dipped in gold but I figured as long as I keep the boost around 10psi and keep the revs below 6000RPM I'd be alright. I'm thinking of going a season with the current shortblock and if it survives (I have a bad habit of pushing things to their mechanical abilities) I'll rebuild it with some better parts that are more blower-friendly.

Anyone else have any opinions on this buildup?

Jody has it right, for sure do NOT use the P600B. Scott at SCDE will be a valuable resource as you progress through the build.

As a personal preference I am not much of a fan of the Demon carburator in a blow through application - I prefer Holley. Carb setup is THE critical factor to getting results. I've used www.customcarbs.com (http://www.customcarbs.com) - one of the things they do is to actually run their customer's finished carb on an actual blow-through supercharged engine in their shop to verify fuel trim.

I ran 10.5 psi of non-intercooled boost with crappy California 91 reformulated pump gas. I probably could go higher on boost with pump gas, that was just where I was comfortable. With C16 in the tank I ran 17.1 psi of non-intercooled boost.

Definitly worth mentioning:
Do NOT run the old ATI pancake/K&N style carb hat, it is a very poor design that causes excessive turbulence around the air bleeds and boosters. There are several newer designs, almost everyone achieves the most power using the West Coast Fab carb hat - I think the West Coast Fab carb hat added a little over 40 hp on my engine.

Thomas