I have a b18c5 engine and let say i wanted to use a 13:1 CR piston.
But since i don't want the CR that high i would like to use a thicker head gasket to try and lower the compression ratio. If i use a 1mm thick head gasket how low do you think the compression ratio will become assuming that the engine is completely stock. And also with the new lowered compression ratio will it be safe enough to drive on 91 octane? or will there be some knocking etc..
(CR = Compression Ratio)
any estimate range on CR would be nice thanks!
At the new CR, will bigger injectors help prevent the knocking. What will help me prevent the knocking. What else can i do to lessen the CR. Thanks HT!

 

hope this helps.
http://www.zealautowerks.com/bseries.html

 

Are you able to mill the piston, that is does the composition of the material allow for milling down the valve spaces. this way the compression is essentially maintained, but valves will not hit piston.

 

bump