Just off the shelf availability for any of the manufactures found. I agree 10:1 or even stock would have been better. But when I purchased this built bottom end, it had supposedly 0 miles, but after taking it apart, I discovered that it was fresh, but had been put together dirty and some of the bearing surfaces and walls in the sleeve had some slight scoring, the clearances were also too loose at 0.55 thou. It was built for an 800+hp turbo car apparently. So I had to get the sleeve re honed and move up a size in piston to get a closer tolerance for my needs. I chose to go with the biggest piston possible at 89mm. CP's highest compression off the shelf with anything larger then a stock 87mm is 9.6:1. I generally agree with staying stock compression with a supercharger, but I had to take a slightly different path due to these circumstances. Looking on the bright side, I’ve got a 2.3 liter now, which hopefully will compensate for the 1.5 comp loss, wile also being more forgiving to tune. Will see what happens. I'm going to get a baseline N/A dyno this fall when its done, see where I’m at out of the box. My only saving grace is knowing that sideways is running even lower comp at 9:1 and is over 500whp. He has quite a bit of breathing mods that I dont have however. I'm running a stock ap2 head with factory header.

 

Hmm... I wonder where that will put me since sideways is 500+ at 9:1 comp. Jeff Evans said I should expect to pick up 10-15% additional power from stroking to 2.4

 

Yes you will, but it will be at a lower rpm. Its easier to make power higher in the rpm, but your sacrificing that for more bottom end trq. its a totally different strategy in engine build then what sideways has done. Your rev limit will be shorter, so your going to have to find a pulley small enough to max the blower out at that rpm, which may be challenging. sideways revs to 9500rpm. Centrifugal Superchargers are most effective in the top end, and therefore on a high strung 4 banger. Dropping the rev limit reduces their effectiveness area of the power curve. So again just make sure you match the right size pulley to max out the blower at your lower rev limit to get the most out of your set up, what ever that is. Likely 7500-7800rpm.

Will be nice and torquey though Just not as broad, it should have a more concentrated power curve, where using a longer gear ratio like a 390 or 373 may be most effective. Your peak hp may be lower then ours due to the lower rev cap possibly. Just my educated guess.

As far as my build, I'm upping displacement through piston diameter, rather then stroke. So with compression ratio aside. I should be increasing hp and trq throughout the stock rev range.

 

Remember where 9:1 got me...

 

as much as i want to see you run a 1500 blower, only one or two guys have done it and the results are not fantastic. 1200 blower will make serious power.

 

Yeah the 1200 just seems like a better overall, more efficient blower from whats being gathered. I will probably end up with it. I just hope its enough to crack 500whp for me.

 

I'd like to see another 1500, in teh US just to see the #'s.
I was ALWAYS down on HP to the US #'s even with higher supporting mods.

 

My rev limit will remain stock for ap2.

 

My rev limit will remain stock for ap2.
[/quote]

With a longer stroked motor, a lower rev limit is typical to insure the engine doesn’t destroy itself prematurely. There are more stresses on a longer stroke engine. The power band itself shifts down in rpm also, so there is a point where it doesn’t make sense to rev higher, though being Supercharged that rpm is likely higher then what is safe for the motor. But Inline pro is cool with 8200rpm on the 2.4? Thats good news for you. I have a friend who is getting a 2.4 tuned soon. I'll be interested to find out where they cap it on his turbo set up.

 

Yeah I think we all would like to see this, but it is a pretty big investment to risk being disappointed. You know all to well of that unfortunately. Who bought your 1500...and what ever came about with their set up?