im looking to bore my 7mgte .040, just kinda wondering what kinda horse power i will be at, with cat-less exhaust, running 8 lbs of boost, intake, metal head gasket... anyone have an idea?
horsepower gain?
- Thread starter supratj
- Start date
No real gain from .04, You have to realize that is not much bigger. The main reason for boring our engines is just to get everything back "straight".
Stock is 3.267", and .04" Over bore = 3.307"
Stock is 3.267", and .04" Over bore = 3.307"
but there is power difference right? i mean, bigger pistons, doesnt it change the compression ratio or anything?
comp ratio should be at about 8.5/1
hit the dyno, then tell us how much you're making. that's the only way to tell.
hit the dyno, then tell us how much you're making. that's the only way to tell.
You'd be lucky to measure the difference in power given all the variables.
It would probably be within the +- error for the dyno.
It would probably be within the +- error for the dyno.
going .040 overbore will not gain you any power, like stated above will be done to keep everything internal in place. When you do a rebuild most of the time the cylinder walls will need to be bore out a little that is the reason why a lot of people go with 0.020-0.040 overbore pistons.
Down but not out said:
Whoa, WTF was I thinking:nono: Thanks for making me do a double take on that. You are correct sir! Even knowing that .04 is aprox 1mm, it didn't hit me how off that was. I will have to try and find that link I was looking at, but I'm sure it probably said .004 ish and not .04 :icon_redf I edited that post.