SOHC.co.uk Forums > CB750
bore to piston clearance k2 advise please
McCabe-Thiele (Ted):
What book are you refering to - is it the original Honda workshop manual?
Nurse Julie:
Are you talking metric or imperial, ie inch or mm? Piston to bore clearance after rebore, hone to spec and X hatch should be 1 thou inch, which = 0.0254 mm. If you are using genuine Honda pistons, the clearance can be down to 0.8 thou inch. Any greater clearance than that, the engine will smoke badly. Not sure which book you're looking at but those figures don't sound familiar for a piston to bore clearance. .
Edit.... All the above is assuming it's not some fancy race engine with very high tech pistons and nicosil liners etc.
K2-K6:
It is written as stated by riverboy in original Honda workshop manual Julie, that "thou" spec.
I don't understand it either ;D and looks like some spare noughts are literally spread within that.
I was just sitting puzzling as to what that converts to, and doubting the outcome.
Isn't that saying 4 millionths in that 0.00004 inch figure ?
K2-K6:
Now I've got a spare nought ;D
And I said liberally, not literally (addressed to my fugg'n spellchecker) and substituted while I wasn't looking ;D
Nurse Julie:
--- Quote from: K2-K6 on October 29, 2024, 08:20:18 PM ---It is written as stated by riverboy in original Honda workshop manual Julie, that "thou" spec.
I don't understand it either ;D and looks like some spare noughts are literally spread within that.
I was just sitting puzzling as to what that converts to, and doubting the outcome.
Isn't that saying 4 millionths in that 0.00004 inch figure ?
--- End quote ---
Maths isn't my strong point Nigel, especially when so many zeros are involved. But, if those figures are correct is that saying its been rebored to 4 thou clearance as if that's the case, the oil loss will be on par with the Torrey Canyon.
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