Thread: 8.5 or 9.4 compression with m112 supercharger

Originally Posted by GenVI805

3. Fred Cakanic w/ 421WHP (I/C, G5 m-90, ZZP S3 Heads, 9.5:1) [STD]

those arent aluminum and 10whp more than any m112
i see a 1whp difference between the m112 and m90 on two identical setups

fred has more money into his car than you can put into a damn house. he also leg humps zzp like it's going out of style (which it has...).

his car is nice, but for the money he put into it he should be making more power and run faster times.

The way you calculate lift is to take the intake or exhaust number and multiply it times your rocker ratio. That gives you the total lift. The S1X * 1.80 = .579/.592. Do the math and check. I'm not sure if the valve is open too long or too far with 1.84. I knew someone that had done it and it was acceptable. So I did it knowing the headwork that was needed. I didn't forge any new bounds or figure things out to ensure it's safe. Sorry...

Originally Posted by BillBoost37

The way you calculate lift is to take the intake or exhaust number and multiply it times your rocker ratio. That gives you the total lift. The S1X * 1.80 = .579/.592. Do the math and check. I'm not sure if the valve is open too long or too far with 1.84. I knew someone that had done it and it was acceptable. So I did it knowing the headwork that was needed. I didn't forge any new bounds or figure things out to ensure it's safe. Sorry...

No worries. Sounds like I would be venturing into uncharted territories. The m112 isn't that common on the 3800 either, but i don't think it would be as much of an issue as too much lift for the heads to handle. With my math, I figured about 0.591"/0.605" lift using the S1X and 1.84s.

Likely that's acceptable. I think some of the Stage 4 cams get into that range.

M112 not common? If you want any pics of how the one I assembled for a guy was done, just holler.

Looks like that's the expensive custom m112 case that I think Intense only made like 10 of. And yeah, post away. Do you remember what mods where on the car to handle the m112. Heads ported? I spoke with Trannyman and some local friends for advice on porting mine. My machinist was quite impressed how good they turned out. Either he didn't have high expectations for me or else I did a good job, lol.

I built it.. I know every detail.

New England Pontiac Enthusiast Club :: View topic - mp112 build thread

Originally Posted by BillBoost37

I built it.. I know every detail.

New England Pontiac Enthusiast Club :: View topic - mp112 build thread

Only read the first page so far. That was a great offer you made to build it for him. And I see your Bonneville is running the S1X and 1.8s. Is that a daily driver?