Hey All

Just a quick question

I got a spare head for my 4K, and i wanna raise the compression in my KE55

just wondering how much people have shaved off to get what compression?

20thou

 

You should measure it and do it properly. Set yourself up with a piece of plastic to cover a combustion chamber and a pipette or burette, or even a syringe. With the valves in and the head upside down you stick the plastic over the chamber with grease and fill it up with turps.

 

All 4 should be the same, and around 31cc. Then you can measure the area of the chamber with a bit of graph paper to get how many square cm they are, and calculate how much to skim off to get a compression ratio.

 

Depends what cam you run (as its never 100% efficient) and what CR you want. 9.8:1, 10.5:1? 11.5:1??

 

Post #11 here

 

http://www.rollaclub.com/board/topic/42407-the-girls-ke70/

i measured 20 tho machinist removed 40 and was 10:1

Hightening?