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Geoff in the Gully
Getting it together
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Quick answer
8 to 1, 7.5 to 1 'for some versions'
which versions? That'll be in the slow answer
Geoff
8 to 1, 7.5 to 1 'for some versions'
which versions? That'll be in the slow answer
Geoff
Geoff in the Gully
Getting it together
- Messages
- 281
Robert,
slower answer...
I haven't found any clue as to which versions got the lower compression ratio engines in my collection of manuals.
What I can tell you is the 8:1 engine has a 27.3cc combustion chamber whereas the 7.5:1 has 31cc. The length of the pushrod differs also - 8:1 rods are 132mm while 7.5:1 are 135; 3mm longer. I don't know but that might be important. It might help you identify what you've got if you were wondering.
Geoff
slower answer...
I haven't found any clue as to which versions got the lower compression ratio engines in my collection of manuals.
What I can tell you is the 8:1 engine has a 27.3cc combustion chamber whereas the 7.5:1 has 31cc. The length of the pushrod differs also - 8:1 rods are 132mm while 7.5:1 are 135; 3mm longer. I don't know but that might be important. It might help you identify what you've got if you were wondering.
Geoff
Perfect! Thanks!
I was wondering about compressions because I figure that in the poor road countries they might have delivered the lower compression model engines in the sixties. As fuel processing improved then I would think the compression would have gone up thus increasing the power in the engines.
Barnfind, thanks for the chart! Solves my question!
I was wondering about compressions because I figure that in the poor road countries they might have delivered the lower compression model engines in the sixties. As fuel processing improved then I would think the compression would have gone up thus increasing the power in the engines.
Barnfind, thanks for the chart! Solves my question!