![]() ![]() There seems to be strong support for my comment of 18 March. RE: 2-stroke tuning, squish velocity for race fuel and methanol bob1111 (Aerospace) See FAQ731-376: Forum Policies for tips on use of eng-tips by professional engineers & This is not so critical if you have a high octane vs the dynamic compression ratio as pre ignition will not be an issue, but it still increases flame speed and allows maximum power with less ignition advance. You can still get long life if you are prepared to pull it down from time to time and scrape the piston top where the witness marks appear as the skirts and bores wear and allow the piston to rock more at TDC. ![]() Give it 0.002 or 0.003" extra deck clearance if you want long life with no maintenance. ![]() None of the above mentions total strokes vs power strokes.Īs others have mentioned, a common method is to reduce it until there are just witness marks on the pistons, but make sure the ring lands have not closed down and clamped the top ring i the grove. Longitudinal rigidity in crank and crank support webs or bulkheads. Temperature differences between piston, block, rods and crank. Off the top of my head they are:-Ĭo-efficient of expansion of materials used in piston, block, rods and crank. A whole bunch of factors determine minimum piston to head clearance. ![]()
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