The Flame Speed Creed
grabcad
The common explanation for engines with single spark plug ignition having bores less than 4 inches is that flames can't travel across larger bores. However, this engine extends to 4.25 inches and doesn't exceed 5500 RPM. This design allows for unique port passage sizes and valve areas without hardening dimensions. The limited bore also ensures port passages don't uncurl. Push rods and spark plugs positioning further restrict port placement, making this engine suitable for mobility rather than stationary use or donkeys.
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