I have an eagle cast crank and eagle SIR rods, I have not yet decided pistons so a lot is up in the air right now. I want to run a P600B supercharger with a twin intercooler and I was wondering what PSI I should run and what compression ratio I should run assuming the pistons can handle it... The pistons will be forged, recommendations would be nice.

 

Wow, thats a pretty broad question. Lets start with how much hp you plan on making?. Is this a street car or a race car?,whats your budget?.

 

This will be a weekend/strip car... My brother and I are making it and we both already own camaros so it doesn't have to be that streetable. I was hoping for around 600 rwhp but if thats not possible close to it. There isnt really a budget but I just want to keep the costs down.

 

There might be less choice than you think as I recently discovered. What heads are you going with? If stock, you will have a real problem lowering the CR especially if you are going with a stroker crank. The biggest dish you can get is 31cc (JE). With stock heads, 54 cc and a 3.75" stroke (383) you are looking 9.2-9.5 depending on gasket and block deck height. This is basically where I am now.

If you want anything below 9.0:1 you will have to keep it a 350 and/or go with AFR larger-combustion chamber heads.

 

That sucks, I want to stay away from a thicket headgasket because of the quench size, how much psi would i be able to throw in there with the PB600B and the JE dished pistons?

 

Not sure because I don't have the blower yet. Intercooled I am sure you can get at least 10 psi on pump gas.

 

10 psi pulley or an actual 10psi? The pulley would probably have to be 14psi to ge 10psi of actual boost wouldnt it? (P600B)

 

I dont think you'll get anywhere near 600rwhp. For one, the P600b wouldnt be the blower to go with, I dont think it could do it. And, I wouldnt want to try to throw that much power at a cast crank and those "SIR" rods, which arent too much better than stock. just my opinion. I dont think 500rwhp is out of the question, but I'd still want better rods. As cheap as they are, and many people use them, some of the eagle H-beams would be a good idea for you

 

I agree to a point to what was said above. I know a couple of people that have put down well over 500rwhp with the p-600. I do agree that you wont hit 600rw with the blower only. The p600 just wont deliver the cfm your looking for. I know the d-1 will get you were you want to be but not the the current head unite you have now. Im also sure you will see more than 10# of boost as well with stock heads witht he 12#pulley. Youll more than likely see between 12-14 depending on the day.

 

The P600 is rated at 1200cfm. On a VERY efficient engine you might see 600rw (manual tranny) with one. But I don't think it's possible on an LT1 with 23 degree heads. As MEAN LT1 said, it just doesn't "blow" quite enough!

As Joe said, with an off the shelf piston you probalby can't get the CR as low as you might like with stock heads, due to the small combustion chambers. However, "customs" really aren't that much more expensive if it's a high quality piston in the first place. A shop should be able to order what you need. I like the JE "Extreme Duty Inverted Dome" piston. You could probably order the -31cc inverted dome in the compression height you need and get down to ~8.5:1, which is where you want to be. Most of the Off the shelf "blower" pistons will put you in the low 9's.

Rich Krause

 

It doesnt need to be 600rwhp horsepower, anywhere between 500-600 would be fine with me. I just want a very quick/sorta budget car. would the 12 lb pulley and the p600b on a -31cc dish work okay with a compression ratio of 9.3 or so on pump gas?

 

Yes it will be fine. That was pretty similar to my old setup.

 

yeah that should be fine, im planning on 9.7:1 with 15 psi on 94 octane and methanol injection.

 

One more problem, the only pistons I found by JE (-31cc) are for a 5.7 rod, do they have one for a 6" rod?!

 

Call them. That's why I was referring to a "custom" piston. They can probably make the -31cc with the right compression height for a 6" rod.

Rich Krause