Tinkerboater,there is a thermostat kit for jet boats, some call it a recirculator and it works good. some setups control the temp with valves only.I think an important part of preventing detonation is polishing the combustion chambers and the correct spark plug.Hot spots can occur where little casting "peaks"appear and polishing removes them and makes it more difficult for carbon to stick.I coated all my pistons with a thermal barrier coating and will do the chambers as well.
thanks guys didn't mean to start a fight here.. still a little confused on cr ratio though. 77 i have been told to look for a roller cam in the 610-.680 lift, .315-330 dur. 108-110 lobe centers range. i planned to run the world merlin heads with probably no extra work to them. I'm sorta gathering the 10.5:1 is gonna be to much would i have any problems wtih 10:1 or could i go higher?
thanks
tahiti jet with that kind of cam and 10-1 in a jet should be no problem on 92 pump gas you can bump the timing down a little if it is a problem or add a can of octane booster (still cheaper than race gas too).but in a boat or a car 10-1 is about the max you can get away with on pum gas.
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