My 50cc is bored 20 thousandths over. what does this make my atv now (55 cc?) or what?

 

This is not my strength but here goes. The size of the engine is stroke dimension times bore dimension. All you have done is increase the bore .020 or 0.5mm. I would guess that it has increased approx 1-2 cc. If you give me the stock bore/stroke I will try to do the math for you.

 

40x39.2mm will there be any poer improvements at all?i doent expect anything signifigant.

 

The only power increase will be making up for all the wear that required the next oversize bore. To put in in perspective the average human brunette hair is .003 thick(blonds .002 Reds .004) So if you stack 7 .003 thick hairs on top of each other( yes it would be a bitch) they would equal .021. I am struggling with the math to figure out the cc question so give me some time and I'll figure it out.

 

40x39.2mm= 49.26 cc

40.5x39.2mm= 50.49cc

I needed help to figure this out, check this site out:

http://www.Spam wordSpam word Spam wordSpam word Spam wordSpam word Spam wordSpam word racing.co.uk/capacity.htm

This site saved me on this. As you can see you have increased engine size 3/4 of a cc


I was wrong, you got a 1 1/4cc increase in engine size.

 

THANKS ALOT!

 

No problem, It was kind of cool to do the math for you. Have not done that in year's.

 

FYI: boring isn't how to make power on a 2 stroke. Like the one guy said, minimal gains.

 

In a mini 2 stroke, would more compression give better power gains? I know timing and porting does wonders but with a stock engine, is it better to add more compression instead of boring over?

.

 

IMO: more compression does indeed do more than just boring, but is just a piece of the puzzle. Porting is where the biggest performance gains come from. [img]i/expressions/face-icon-small-smile.gif[/img]