Quote:
Originally Posted by stownsen914
Let's see if Henry or others chime in, but I believe 1.5mm is considered a bit high and can encourage detonation which could be risky for a high compression engine. At the compression ratios you're talking about, you'll need to run 100+ octane.
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This theoretical 1.5mm deck height being detonation prone is generally a consideration when discussing larger bore engines.
I think Seppo is confusing piston clearance with deck height. Deck height will affect piston clearance but is not the same.
Piston clearance should be at least .070".
The term "deck height" as I understand it is the measurement from the cylinder deck to the piston deck. 1/2 stroke plus wrist pin height will determine piston deck.
(Crank center to cylinder deck) minus (1/2 stroke plus pin height) equals deck height.
Generally just measuring from the cylinder deck to piston deck with a caliper will suffice.