Correct me if I am wrong but I've heard that you can't or souldn't run high compression pistons with a turbo. I beleive this but don't understand why? If someone could clear up this confusion that'd be great.


Tyler

 

High compression increases cylinder pressures and temperatures. A turbocharger inreases cylinder pressures and temperatures, but does it by forcing more air into the cylinders, instead of taking the air in the cylinders and compressing it into a smaller space.

Don't worry about the physics of it, but lower compression means you can run more boost and timing, and subsequently make MORE POWER on pump gas. There is a thing going around honda-tech right now that 10:1 or higher compression is great for a streetcar because it "improves off boost response" and **** like that, but I don't buy it. If you're rebuilding the motor for your street car, run 9:1 compression.

 

So which would be better for drag setup? Both high comp pistons and turbo or just one or the other?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LSEGHATCH &raquo;</TD></TR><TR><TD CLASS="quote">So which would be better for drag setup? Both high comp pistons and turbo or just one or the other?</TD></TR></TABLE>

How many 600 WHP naturally aspirated turbo B-series hondas have you seen? None. How many turbocharged 600 WHP B-series hondas have you seen? Several. Turbo makes a ton more power than naturally aspirated, no question. If I were building a motor purely as a drag motor I would probably run 10:1 compression because it will give you a few ponies over a 9:1 motor, although reducing how much power you can make on pump gas. If the car is never run on pump gas, that becomes a non issue. I'm going to assume you're building a street car that you want to take to the drag strip once in a while, so once again, run 9:1 compression.

 

Thanks for clearing that up...the project car I am starting will be driven at the track once and while otherwise to car meets and around in the summer and maybe winter not sure yet.. you can check out what I have in mind in the EG civic forum.

Thanks Again,

Tyler