CC's to compression help

[turbowrenchhead]

I've never even heard of uccr until today. I found a long article on the web. I'll have to read it tonight when I have time.

[turbowrenchhead]

Now I know the difference. According to that article anything over uccr 11.5:1 is the most you can run on 93 octane. According to that article my uccr was to high last year. But yet it ran great and there was no piston damage from detention.

[sheerider11]

Dome design plays a huge role too.

^^^^^^

[turbowrenchhead]

Uncut Pro design domes, nothing special.

[registered user]

is your cylinder cut down ?

[turbowrenchhead]

I had it decked .004. Nothing drastic enough to change the combustion chamber size significantly.

[turbowrenchhead]

I'm still boggled how I could of run a high 13's:1 compression last year without any problems. I even ran a tank of 87 octane in it because there was no other octane options. It still ran good an pulled hard.

[turbowrenchhead]

I had a set of 22cc domes so I put those in and got 15cc of fluid into the cylinder. I did a cracking compression and got 160psi. This reading is spot on with the changes that I made. I had a 150psi cranking compression last year and the bike ran great. So I'm ordering 23 and 24cc domes. Stands to reason that I'll be able to get 16cc's of fluid in the chamber. This brings me to 12.3:1. with 24 domes I'll be at 11.6

[turbowrenchhead]

Looks like they don't make 23's or 24's. Hmmm.... now what

[turbowrenchhead]

I was playing around with the calculator. The base gasket thickness makes a big impact on uccr. I have a .020 base and a .031 handy. OEM measures out at .026 but I don't have any of those.

[WINDYCITYJOHN400]

Yur learnin

[turbowrenchhead]

What I need is custom cut 24cc domes

[sheerider11]

What I need is custom cut 24cc domes

What's the set up? Is it 4 mil or SS?

[turbowrenchhead]

Ss