Quote:
Originally Posted by 350TSS
With a higher than standard compression ratio you probably need to adjust the ignition timing a few degrees (cannot remember which way - advance or retard - probably retard). The extra compression would make it run hotter anyway but if the spark timing is sub optimal that will definitely make it run hotter still. Extra heat > lubrication breakdown > ring and bore wear > excessive pressure in crankcase - maybe?
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On the 888 we're up at 13.5:1, maybe a bit more as we have set the squish at 1mm as well. Yes the ignition timing is altered (retarded) and the cams are timed to suit, we also run 105 octane fuel to keep the burn as cool as possible with the higher comp. All things to consider.