Yes, Roger, they are indeed round and parallel. At 2.65in they are essentially 0.090 oversize. The oval and taper specs from the hepolite catalogue (1952 version) looks kind of challenging, but then, thinking about it, I guess shaping pistons in this way has been going on for around a century so it should be reasonable to expect a machine shop to be able to undertake the work.
My other thought: is the depth of the ring grooves the same for different sizes of piston, ie., std to 0.060 over?
1948 Sq4 basket job - help!
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Roger Gwynn
- Holder of a Golden Anorak
- Posts: 1943
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Re: 1948 Sq4 basket job - help!
The thickness and depths of ring do not vary over the the sizes but must suit the piston of course. I should have the dimensions listed if they are Hepolite.
Roger Gwynn, Membership Secretary, curator of the Machine Register and the works drawings. Director of Draganfly Motorcycles, Craven Equipment and Supreme Motorcycles mostly retired.
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