Posted by RAB on January 01, 2009 at 14:04:15 from (195.93.21.10):
In Reply to: Timing Question. posted by Guido on January 01, 2009 at 08:35:44:
WHAT is the problem? Nearly all times refer to piston position - relative to Top Dead Centre (TDC)or sometimes easier to quote BDC (bottom dead centre. That has to be in the direction of normal running.
Timing simply refers to when an event occurs in relation to another. TDC is not the same crank position for both ways of rotation. Full stop.
So timing is relative to the piston position. Diesel injection is often measured as distance of piston before TDC when the injection cycle commences. It happens to be 2.26mm + or - not a lot before the piston is at top dead centre position on my little Peugeot.
Degree markings are simple men's working marks and are close enough for nearly all mechanical operations (provided they, the mechanics, can remember to turn the engine in the right direction!). Proper Engineers measure distances. They are the fellows who designed the engine and a few others who might just want to get it exactly 'as design'
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