Ideal squish clearances for 61x BB

[kawyjunki]

Did a search and found this for a 701 but did not know if it would pertain to a 61x BIG BORE at 86mm/790cc. What is the minimum/maximum squish clearance you would want on a freestyle motor of this size. Is there an Ideal number or a range you would want to be between? And this will change as you change dome sizes correct? How can you determine what dome would give you the correct squish. Or for example are all 760 domes squish area's set at the same, and just cut to different cc's. Basically I think I may need to deck my cylinder, but I want to reatain my current compression and I am trying to figure all this out, so please bare with my stupidity. Thanks
Oh and this is of course on a pump gas set-up.

 

[Rickster]

For strictly Freestyle .045 sems to be the magic number. I'm running .055 and could use another .010 taken off.

Talk to Chuckie, as I have hear he is able to mill both the bottom and top of the cyliders depending on the porting that was done.

 

[waxhead]

I would be happy with .40

 

[Big Kahuna]

so would I!!!!!!!!!!!!!!!!!

I got to burn up my 111 octane then break motor down and install thicker base gasket.

 

[waxhead]

I have run down to .35 on my race engies on pump gas
it works fine
you have to be careful on your timing and dont run any fuel thats been mixed over a week

 

[#ZERO]

I'd run .048" squish with your engine size and ADA domes on pump gas.

 

[crammit442]

I'd run .048" squish with your engine size and ADA domes on pump gas.

How did you decide on .048 instead of .047 or .049?:thinking:

 

[yamanube]

How did you decide on .048 instead of .047 or .049?:thinking:

Maybe that is what you get with 86mm pistons and ADA domes?