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Re: A15 Deck Clearance and piston dish capacity query.

Subject: Re: A15 Deck Clearance and piston dish capacity query.
by edp on 2019/12/8 15:08:22

Are you trying to find the static compression ratio of your engine build? If so my recent experience on my A12 proved the numbers in the wiki incorrect for CCing a cylinder head. A brand new NOS H72 head I have never milled, never on a motor, never built worked out to 41 cc’s .

I think the wiki says 25 to 30 mL so I found relying on that info completely inaccurate for figuring out the compression ratio of this motor. Best to physically see the piston in the block and the head individually.

As an example the H 72 head I’m using is 25 mL and it’s been milled substantially, to the point where I need to use index washers on the spark plugs to clearance the piston tops as they’re forged And actually stand above the deck.

Overall my point is just do it physically so you know with certainty what it is you’re putting together.

Good luck!