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Registered
Join Date: Jul 2001
Location: Portland Oregon
Posts: 7,007
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As a talking point, 92mm RSR pistons with the 66mm crank yields something around 10.5:1 using 2.2-2.4-2.7 heads. With 2.0 heads, its a bit higher.
IMHO, you will need twin-ignition to safely operate such a setup on 93 octane fuel, especially in Texas summers. I'd kindly suggest that you carefully measure your CR as you build the engine so you do not have a problem with expensive consequences.
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