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VW 1835cc vs 1915cc: Why is the 1835cc more popular?

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Vigilant1

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When we talk about "small" VW aero engines (those with a 69mm stroke), I get the impression that most folks go for the 1835cc (92mm bore and 60HP) rather than the 1915cc (94mm bore and 65HP). Since the cost of the parts is the same, the weight is (virtually) the same, and boring the case for a 94mm cylinder is no more trouble than for a 92mm cylinder--why don't more folks take the "free" 5 extra HP? Scott Casler only charges $25 more for the 1915cc engine than the 1835--$5 per HP is a deal that is hard to beat!

I'm guessing that the relatively small amount of metal between the cylinders in the case and the heads with 94mm cylinders might be the reason folks prefer the 1835cc with its 92mm cylinders. Is it that, or is it something else/additional?

Thanks
 
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