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Ignition advanced, can't adjust, part II 700 1986

uid 5008's pic
posted by  Colin UK on  Thu Apr 10 12:40 CST 2003
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David,
Your statement, "I think that taking a visual on the cam lobes may not be accurate enough. Remember that a 23 degree error at the crank will only be a 12.5 degree error at the cam and thats not much to see when you are eyeballing those egg shaped cams"
Is perfectly valid, but a much more easily visible check is to ensure that, with no.1 cylinder on TDC. compression, No.4 cylinder valves are rocking, ie.
inlet and exhaust valves just opening and closing respectively, as the engine passes though TDC.
Before I get shot down in flames over this, I do appreciate that this does not work with engines with asymmetric valve timing, or those with large valve opening over-lap but, for most normal, ie. not high performance/race tuned engines it is much more accurate than judging the position of two cam lobes pointing skywards!
Colin.





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