Will a .30 over bore gain me any real HP? I know it's the farthest I can go with out going big bore, but will it help? Lidio, (who I think it a moron and everyone sucks his crank way to much) bores out his motors when he builds them. Someone told me anything helps but I want to know if I'll have any real power gains? If you know then what are some numbers? Thanks

Mike

 

My guess is it's probably not something worth doing unless you've already tore the motor apart for something else. Like, I wouldn't take apart the engine just to bore it over .30. But if I were doing something like a stroker, or converting to forged internals, you might as well bore it out while you're in the neighborhood. But if you're not doing anything else, I wouldn't.

 

+1 if you are stroking, rebuilding, or forging your motor, you might as well bore it .020 or .030 over. Otherwise definitely not worth it. I personally would bore it as little as possible because it leaves room in case their is a next time. As far as gains go, just boring your engine .030 over is not gonna give tons of power. You will only increase by a few cubic inches.

 

Boreing an engine doesn't give it any power. Only bore it if you have to to clean up the cylinder walls.

 

I am starting to build a new motor so thats why. And it will be a forged stroker, although I don't expect ANY power increase from the stoker.

 

fixed.

 

Just putting a bigger piston in doesn't give you any more power on any motor. Running a bigger piston give it potential to bring in more air and fuel each stroke but if your still running the same stuff for the intake it's not going to help any. When you install a stroker kit in a motor it's the stroke that gives you the extra torque, not the bore. Boring a motor .030 over gives you 4 more cubic inches which does nothing.

 

Boring an engine (without any other changes) will increase the compression ratio slightly (0.15 on an 3.55x3.55 engine with a 54cc head, zero deck, and .039 gaskets). There will be a power increase, but only a small number of horses (5, maybe).

 

+1 It's not something you would want to do to "get more power". Just do it to clean up the cylinder walls.

 

bore it and stroke it with a 7cc dish piston