Does anyone make high compression pistons?

noslofiveoh

365 posts · Joined 2007

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#2 · Mar 1, 2008

what exactly are u wanting to do with the bike? the stock compression is 11.4:1 IIRC.
get ahold of marc at www.factorypro.com they might be able to help, they've done a few winning race 250's and might have info.

 

rotts4u Discussion starter

78 posts · Joined 2007

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#3 · Mar 1, 2008

I know it seems crazy but I want to build a 250cc Ninja specifically for land speed racing. The class is exactly 250cc so I can not over bore. On most sportbikes compression is more like 13-1 and I have had a 1000cc ZX-10 that was closer to 13.8-1 afer shaving the head etc.

So basically I need as much top end HP as possible and if I have to give up a little street manners/low end torque I am fine with that. So I was thinking that I could get pistons made to get me to that compression ratio easier than trying to shave the hea due to the other problems with that approach.

 

rotts4u Discussion starter

78 posts · Joined 2007

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#5 · Mar 2, 2008

I see all kinds of posts on exhausts, jet kits (I cant believe in 2008 I have to ride a bike without EFI) airbox, filters etc. But I dont see much on head porting, compression increases, pistons, cams.

If I decide to do this thing I will likely slam it for aeros and build a custom fuel tank for a lower tuck too. I will also try other fenders for better front tire coverage. On my other land speed bikes the fender alone made a good difference.

 

D

dirkabegone

843 posts · Joined 2008

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#6 · Jun 17, 2008

I would like to bump this, any progress?? Also what is the max the 250 can be bored? What about going with the zephyr bore... idk What do yall know about boreing a 250?