low compression for blown motors

[02stangGT]

I was just wondering why it is better to have low compression when running a supercharger?

[WildBill]

I was just wondering why it is better to have low compression when running a supercharger?

That's not necessarily so. Your combo is a perfect example.

With a centri, it's better to have relatively higher compression since you don't build boost in the lower rpms.

But to answer your question, it's all about effective cylinder pressure. Superchargers add cylinder pressure. It's EFFECTIVE cylinder pressure that mandates timing allowed and fuel requirements.

[02stangGT]

So the stock compression is best because im not running a lot of boost?

[WildBill]

So the stock compression is best because im not running a lot of boost?

In your particular case........yes

[02stangGT]

my car just hit 87xxx miles. what is the max hp i would run with out blowing up the inside? (still have stock internals) have seen same set up with 420-450rwhp.

[WildBill]

my car just hit 87xxx miles. what is the max hp i would run with out blowing up the inside? (still have stock internals) have seen same set up with 420-450rwhp.

TOTALLY depends on how well the car has been maintained and beat on in the past, fuel system and the quality of the tune.

I've seen 02 GTs run 430 to 450 for long periods of time.

[El Jefe]

my car just hit 87xxx miles. what is the max hp i would run with out blowing up the inside? (still have stock internals) have seen same set up with 420-450rwhp.

Most I ever saw on a stock motor was right over 500rwhp. Fuel/Amazing tune I guess but the max on most is right around 450

Some great reading here:

http://www.modularfords.com/forums/s...ghlight=static
http://www.modularfords.com/forums/s...ad.php?t=34527
http://www.modularfords.com/forums/s...ead.php?t=9673

[wickedcobra]

I'd say it would depend on how you drive it. Balls to the wall all the time = motor doesn't last.

[02stangGT]

thanks for all the advice! I dont drive my car hard that often. but i love knowning that i have the power if i want to. its my DD so i dont drive it hard alot cause it has to get me from point A to B in one peice

[02stangGT]

just wondering kinda new at this.. if i was going to get a forged short block what compression would i want with my set up?? would i raise it more than stock??