Originally Posted by
84Elky
Hard to tell the chamber design from pic but generally a fast burn chamber will be in the 62-65cc range (your's 62cc), and will need much less spark than larger due to the better burn (eg-Vortec iron at 65cc). But again, everything is factor of compression ratio, quench, octane, etc. Given knocks in 2nd upper RPM, would stay at 32* or less all-in and maybe at slightly higher RPM as you mentioned. It's all trial and error without a dyno. Engine will always feel peppier with more advance at the lower RPMs. Just have to be careful at the higher.
Will be interested in the 0% TPS knock test plus accelerating as much as possible under load in higher gear without down shifting.
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