7mil Cub Compression?

[Stellar Performance]

Hey Guys.....I just did a compression test on my 7mil cub with 20cc domes. It made about 152psi on each cylinder. I figures due to displacment and stroke, it would be higher. I am converting to alcohol before the next glamis trip and am wondering what domes to put in. Before I went to the 7mil and cub cylinders, I used to run stock cylinders with a 65.5mm bore, 4mil crank and 17cc domes. I know that then I was pulling around 178 psi per cylinder and that was with race gas. I am not dissapointed in any way with my current setup on race gas......but if I can make more power why not. Any input would help. I am new to larger bore banshees and am new to alcohol. I have always been extremely successful building and tuning my own bikes, but any input is greatly appreciated.

[locogato11283]

well you were running 17cc domes with your old setup. of course your compression was higher. if youre running 20s now drop to 19 or 18 and watch your compression go up.. i run my 10mm cub on about 170 pounds. that way its got decent bottom end and doesnt sacrifice revving on top because the compression is so high. i wouldnt get over 175.

[Stellar Performance]

well you were running 17cc domes with your old setup. of course your compression was higher. if youre running 20s now drop to 19 or 18 and watch your compression go up.. i run my 10mm cub on about 170 pounds. that way its got decent bottom end and doesnt sacrifice revving on top because the compression is so high. i wouldnt get over 175.

 

The only reason I thought the compression would still be up there is due to the larger displacment. I thought that 152 was a little low. But my top end still looks great. No noticable wear at all. What size domes are on your 10mil?