Seen here it looks perfectly round but pistons are not round!
The piston size increase from the normal 875cc to the 998cc size requires the piston to be made 14.1% thats then 998.37cc
close enough for the purpose of this thread. This piston was made in Australia but they are made in other countries also.
Have a look at the way the Imps bearing cap is grooved to meet the conrod, there is no room for movement with this design.
The cylinder head behind the piston is an early Mk1 version, casting
number 7010128 C
The piston diameter is 71.89mm across the pin and 72.38mm across the thrust face, the 998cc Imp block is said to have a bore of 72.5mm.
Roy
The piston size increase from the normal 875cc to the 998cc size requires the piston to be made 14.1% thats then 998.37cc
close enough for the purpose of this thread. This piston was made in Australia but they are made in other countries also.
Have a look at the way the Imps bearing cap is grooved to meet the conrod, there is no room for movement with this design.
The cylinder head behind the piston is an early Mk1 version, casting
number 7010128 C
The piston diameter is 71.89mm across the pin and 72.38mm across the thrust face, the 998cc Imp block is said to have a bore of 72.5mm.
Roy
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