They could just be 67 year old originals. If the rings are the same then how is the compression?
Tom
Out of curiosity, what endoscope did you buy? If it reaches right down the back of the oil tank, it could be used for looking inside cylinders through the plug hole and looking inside primary chaincases. Could be useful.
Dear Tom,
E7 part number for a piston and the 6 will be 6:1 compression ratio.
They could just be 67 year old originals. If the rings are the same then how is the compression?
Ah Thanks Eddy, that makes sense. Thats quite low CR ?
Presumably the petrol after the war was not too special.
What do most people replace them with if I do a re-bore at some stage?
Onw would have thought that for touring, between 7 and 8 would be perfectly ok, and give it a bit more pep.
Cheers, Tom.
For what it's worth I have an Extech BR250 Video Borescope that records still jpegs or video at 640x480 NTSC. I also have all three 1 m cameras/probes made for this device, each having its own advantages. If anyone else wants to go down the hole with a borescope, the following optical characterization measurements I made on the probes will be useful information for them even if they buy a different one:Out of curiosity, what endoscope did you buy?
In a sense, yes, but what it really comes down to is the specifications a unit has vs. the specifications you need. I've had this borescope for something like three years so it's possible another one with better specifications and lower price has come on the market since then.I suppose its all down to the budget.