mike6301980

I tried pm you i am new to the site and dont know if it worked if not here is what i sent The head has a cut 18cc dome approx 18.5 is what i was told. Never actually cc it. It seems like i should have more compression than i do with that dome. The motor is a vitos 68mm bb nikasil cylinders(they are not the mono blocks) with their 4mm crank and 110 rod with their weisco/vitos piston. I was going to back the timing off but everyone said that i need it for ignition advance at high rpm. Let me know if you need any more info. Thanks Mike

I recently built a 421cc motor and am running .050" squish with 165psi comp. with 110 torco and +4 timing. After 2 or 3 passese my ground strap will close up and touch the electrode. The plugs are running nice light tan color I put more fuel to it with no luck in solving the problem. It seems like detonation but dont know why. Should I back the timing off or may it be something else? Any help is appreciated The plugs are also comming loose which I would think would be due to detonation