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Is glazing a real risk with idling engines or a myth ?

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McCabe-Thiele (Ted):
In the four years or so that I have been a sohc member there are occasional mentions about the dangers of "Glazing"if running an engine idling for long whilst making adjustments.

I've taken the comments at face value without asking what evidence this is based on and what it actually means.
How real is the notion and what causes it if inded it can happen?

Johnwebley:
I believe if it is a rebuilt motor, the sooner you can load the piston rings, the better



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Nurse Julie:
Yes, on newly rebuilt engines having had a rebore and new piston and rings fitted, glazing of the bores is a problem to be avoided by putting the engine under load, making the piston rings fling out to cut into the newly cross hatched bores. If this isn't done, by just letting the engine tick over, the bores glaze and the engine smokes. Also, idling without getting cool air around the fins can cause a newly rebuilt top end to seize due to heat retention.

SteveW:
What about if you’ve just run a hone down the bores and fitted new rings?

Nurse Julie:

--- Quote from: SteveW on September 01, 2024, 12:37:48 PM ---What about if you’ve just fitted new rings?

--- End quote ---
Depends if you've crosshatched the bores and what the piston to bore clearance is.

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