Roman et al.,

Rather than going with lower-compression pistons, you may want to consider "high-definition" auxiliary injection (aka, HD AI), either water or methanol.

I will be doing "water" AI on my 1.3-liter rotary for knock and cooling control for about 350 RWHP (approx. 437HP crank) in a 2800-lb. car.

If you chose "methanol" be prepared for an intake manifold temperature so cold you don't want to touch it.

The turbo Buick guys have been doing AI for years, and you don't need a very large intercooler (87 pages containing 3461 threads):

http://www.turbobuick.com/forums/alcohol-nitrous-propane-tech/?daysprune=-1


HD AI allows millisecond control, and offers safe-guards like retarding when out of methanol/water, or a loss of signal.

Check it out here and scroll down to this phrase:

< I bring good news… 21st century AI is now available >
http://www.rx7club.com/showthread.php?t=806104

With a twin-turbo on a 1.3-liter he's making 498 rwhp (about 622 crank HP) @ 20-psi on 93-octane PUMP gasoline for the last 4-years!

He tore-it down, measured negligible wear, and the insides were super-clean due to the constant "steam cleaning" effect of AI.

Resources

HD-AI vendors:

http://www.aquamist.co.uk/index.html
http://www.coolingmist.com/
http://www.fjoracing.com/index.php

AI vendors
http://www.alcohol-injection.com/
http://www.alkycontrol.com/
http://www.snowperformance.net/

AI Forum links
http://www.aquamist.co.uk/phpBB2/
http://www.turbobuick.com/forums/alc...-propane-tech/

:-) neil