03-08-2021, 09:14 PM
Hepolite 17229 pistons are - as far as I can tell - identical to A7 pistons except for the gudgeon pin diameter, which was increased from 1/2" to 9/16" (I *think* these were applied to late OHV Regal 600cc engines).
I have often seen side valve Regal rods reamed oversize to take the larger gudgeon pins - the small end bush has (barely) enough bronze to accommodate them.
My question is, has anyone successfully fitted them to A7 rods with 1/2" pins?
A7 rods are, I think, too slender to accommodate the 9/16" pin. However logic suggests the piston might plausibly be bushed undersize.
Someone, somewhere must have tried...?
I have often seen side valve Regal rods reamed oversize to take the larger gudgeon pins - the small end bush has (barely) enough bronze to accommodate them.
My question is, has anyone successfully fitted them to A7 rods with 1/2" pins?
A7 rods are, I think, too slender to accommodate the 9/16" pin. However logic suggests the piston might plausibly be bushed undersize.
Someone, somewhere must have tried...?