The standard 7.5/1 piston has a dish top with a volume of 29 cc.
The LeMans 8.5/1 piston also has a dish top but the dish is not as deep being
only 14cc volume. A true flat top if it has the same compression height
(distance from the top of the pin hole to top of piston) would give a ratio of
10.5/1. There could be design variations that are flat top but have a lower
compression height which would give a lower ratio.
Without knowing where the top of your piston is in relation to the top of the
cylinder or dimension from pin, there's not way of knowing without measuring
your chambers.
Rick Wilkins
On Jan 15, 2016, at 5:10 PM, Keith Taylor wrote:
> What would be the compression ratio of a BN2 fitted with flat top pistons.
>
> Keith Taylor
> BN1
> BN2
>
> Southern Highlands OZ
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