mfg Posted February 5, 2022 Report Share Posted February 5, 2022 A piston for a Studebaker Avanti R4 engine weighs more than a piston for an Avanti R3 engine......True? Link to comment Share on other sites More sharing options...
r1lark Posted February 5, 2022 Report Share Posted February 5, 2022 True, by a little over 3 oz. Link to comment Share on other sites More sharing options...
Dwight FitzSimons Posted February 6, 2022 Report Share Posted February 6, 2022 The R4 piston is heavier because of the raised portion of the top of the piston (versus the R3 piston). That reduces the combustion chamber volume, thus increasing the compression ratio from 9.75:1 to 12:1. --Dwight Link to comment Share on other sites More sharing options...
mfg Posted February 6, 2022 Author Report Share Posted February 6, 2022 13 hours ago, r1lark said: True, by a little over 3 oz. 8 hours ago, Dwight FitzSimons said: The R4 piston is heavier because of the raised portion of the top of the piston (versus the R3 piston). That reduces the combustion chamber volume, thus increasing the compression ratio from 9.75:1 to 12:1. --Dwight True is CORRECT here! (and that sure is TALL compression!!) Link to comment Share on other sites More sharing options...
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