Guesstimates about compression ratio

This is what I came up with Wisecos calculator. Why o why is the calculator using both imperial and metric??

ok, anyhow, my guesstimates were between 10.5:1 and 11.9:1. With stock values I got 11.1:1, which sounds just perfect.

Slightly related, I just read about an aquaintance of mine who had used 135mm long conrods instead of stock 122mm in his 4A-GE. Wonder what kind of pistons he used…?

(they were custom made by Wiseco + longer conrods from auto verdi)

Oh! Edit 7.9.2017 – where did I get these numbers

Bore diameter: 81,5mm

Engine stroke: 77mm

Head volume: 36cc (stock)

Gasket bore dia: 82mm (HKS)

Compressed gasket thickness: 1mm (HKS)

Deck clearance: 0.7mm (about)

Dome volume: -5.9cc, compared to stock (Wiseco)

 

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