Ball park compression ratio figure

A friend of mine and I were discussing what the c/r would be w/4.600 bore,flat top A460 pistons w/in/ex eyebrows,and a 88cc A460 head? Would it be 14.1 or bigger w/that bore?

Whats the stroke?

It be about 12.8:1 with a 4.5 stroke and about 12.25:1 with a 4.3.

Even with a 4.5 stroke and a build that is plenty optimized for NA, you'd still no more than 12.75:1

Paul

Free compression calculator @ diamondracing.net/tools/

Give a man a fish, feed him for a day.
Teach a man to fish, feed him for life !

res0rli9 wrote:Whats the stroke?

4.5 stroke and a 6.8 rod. How much would you have to cut the head to get to 14.1

About a positive 12 cc +/-

bbf-falcon wrote:

res0rli9 wrote:Whats the stroke?

4.5 stroke and a 6.8 rod. How much would you have to cut the head to get to 14.1

.060

bbf-falcon wrote:

res0rli9 wrote:Whats the stroke?

4.5 stroke and a 6.8 rod. How much would you have to cut the head to get to 14.1

Heads need to be about 77-78cc....You can do it your self here.
http://www.diamondracing.net/tools/

Deviant wrote:Free compression calculator @ diamondracing.net/tools/

Give a man a fish, feed him for a day.
Teach a man to fish, feed him for life !

I said that 5 posts ago

Deviant wrote:

Deviant wrote:Free compression calculator @ diamondracing.net/tools/

Give a man a fish, feed him for a day.
Teach a man to fish, feed him for life !

I said that 5 posts ago

Good for you ... LOL.