11.0:1 306 vs. 9.0:1 306

[Nitrous Al]

Originally posted by PKRWUD
red82gt's advice is very good. 11:1 pistons would very noticably increase your power, but you have to have the fuel to run them. 93 octane wouldn't do it. Also, as mentioned, if you ever plan on adding forced induction, forget 11:1's. If a blower isn't in your future, 10.5:1 is the highest you can expect 93/94 octane to handle, and would provide alot more torque (acceleration) than 9:1 pistons. You should only do so if you have a cam (and intake) that is designed to run with compression that high.

Take care,
-Chris

Thank you for the answer, Chris. I understand what you're saying, but how is Acura and other import makers building "everyday cars" with 200 hp, 11.0:1 compression 2.0 L inline fours? Don't these cars run on 89 octane, get 25 mpg and their smog legal? How do I build my 5.0 306 motor to totally blow away their numbers?