Building an H22 block. Looking to run about 10:1 compression and make 300hp for a daily driver, and crank it up a little more from time to time. I anticipate needing to get a GT35R to push the air necessary, though going to try my GT3071R I have now to see what it will do.

Back to my question. Are normal Mahle pistons ok for boost? They're 4032 alloy, and I'm running 4032 alloy SRP pistons in a GSR engine right now in my Civic. I want to know if Mahle pistons are built to take boost or just for NA. And can I run the Gold pistons in a sleeved motor? I know the Gold ones are meant for stock sleeves, but incase I see a deal on Gold pistons, I just want to know if they're OK and if anything, maybe just last longer.

 

I am by-no-means an expert, but 10:1 sounds a little too high for a turbo build. Just wanted to mention that so you can look into it and be sure you build it the best it can be

 

The Integra GSR (B18c1) has 10:1 compression from the factory and lots of people turbo them. I was going to run 10:1 in my engine when I put forged pistons in but couldn't find any 4032 alloy pistons suitable for boost, at a price I could afford. I was pretty much limited to SRP, which are great quality and a good price, just there's not that much selection. I wound up with about 9.4:1 compression. It's safe and it does better than a friend's 8:1 compression engine he built. It's still not quite what I wanted though.

Lowering the static compression just means you have to run more boost to make the same dynamic compression as if you were running higher compression to make the same horsepower. You have to be more careful tuning, but the trade off is more low end power and it will make my target power sooner with less boost. I'm not looking to make a ton, maybe 400hp, which is easy on the engine I already have except I want more torque sooner. More displacement and more compression should do it just fine.

 

http://www.google.com/url?sa=t&rct=j...BisVig&cad=rja

 

Mahle also makes a 9:1 Gold series piston. This guy is running mahle goldseries pistons in his accord.

http://cb7tuner.com/vbb/showthread.p...highlight=phil

 

Read this thread a while back, tons of people doing it with success it seems, too bad no ones trying NA.

 

jdogg has used them quite a bit for NA. Iirc he also did some development testing on them and S2000 pistons for Mahle.

 

how much work is it to get 300hp out of a h22

 

Well looks like everything should work fine then. I am going with 10:1 because I just really want more mid and low range power. That's the biggest regret with my 1.8 liter I have now, it's just a little lacking on the low end because I don't have enough compression and put a single stage intake on instead of keeping the oem dual stage...and it's only a 1.8 liter.

300hp should be pretty easy on a h22. It's not that hard on a b18c1.