I know the head has been skimmed, so I measured the combustion chamber volume with a graduated syringe. It measures 38 cc. Adding 6.63 cc for a head gasket nominally 2 mm thick and 2.7 cc for the dish in the piston gives me a combustion chamber volume of 47.33 cc, and a compression ratio of 6.26:1, quite an increase on the 6:1 stock figure.
Hi Simon; - I assume you have a flat top piston as opposed to dished or hi-hat piston... I did think about checking my head by same method but neglected to so before fitting. I do not expect to have the head off again for a long time as I reckon I've solved the ubiquitous over heat & gasket blow issues.
ReplyDeleteThey are dished, John. Blog post now corrected, thank you!
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