86 ATC 250r Build

[CodyRosa]

yea no 230 was absolutely crazy.. i could barely kick the thing over lol.. I'm honestly not all sure what he has done to it to get it that high.. all I know is he is overnight a new head for me to use and i should have it running by saturday! He said he had to open the dome up some more? Yup I sent it back to Rob already!

[barnett468]

.

yea no 230 was absolutely crazy. He said he had to open the dome up some more?

yup, they leave the squish band alone [hopefully] and just enlarge the dome to the size/volume they calculate would be correct.

[yaegerb]

yea no 230 was absolutely crazy.. i could barely kick the thing over lol.. I'm honestly not all sure what he has done to it to get it that high.. all I know is he is overnight a new head for me to use and i should have it running by saturday! He said he had to open the dome up some more? Yup I sent it back to Rob already!

cool, rob will take care of you. Yes, he is making the dome pocket deeper for increased volume. For a stock head you should be running around 23cc's. I typically run my heads at 21-22 and my compression ends up being around 189-190 and I use 93.

[CodyRosa]

If I knew where to get 93 around here I'd be all up for 190 PSI... but I have never seen it anywhere around here. Minnesota probably doesnt even sell it anywhere lol..

[barnett468]

If I knew where to get 93 around here I'd be all up for 190 PSI... but I have never seen it anywhere around here. Minnesota probably doesnt even sell it anywhere lol..

if you wanted t run more compression, you could buy torco gas additive which can raise it a couple octane points if you mix it rich, or you can buy real lead additive . . there is only one place in the world that makes it and as far as i know, it is still legal to use off road, but of course it is lead.

http://home.comcast.net/~gregs.speed.shop/site/

this being said, imo, in your case, the increase in power by increasing compression by 20 psi, is not enough to make it worth hassling with additives . . if you were a pro racer that could utilize all the power then it would be different . . its not like going from 170 psi to 190 psi will make it feel like it has 10 more hp.

[CodyRosa]

hmm ok well that doesnt sound worth it to me! especially the extra cost of that additive. I'll stick with my 170-180 psi!