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Timing Marks

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Ray Smith

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The strobe timing specification for my BJ7 indicates 15 degrees BTDC. How can I measure 15 degrees from the notch on the crank pulley? Is each 5 degree incriment aprox. .25 inches?

Thanks,

RAy
 
Your best bet it a strobe with a timing adjustment. You set the degrees you want. Search the history of this forum. There are good extensive discussions on this subject.
 
[ QUOTE ]
How can I measure 15 degrees from the notch on the crank pulley? Is each 5 degree incriment aprox. .25 inches?


[/ QUOTE ]

Ray,

I have a copy of a BMC technical service bulletin dated September 1, 1964. (I added the conversions in parenthesis). It comes out a smudge over 1/4" per 5 degrees.
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Re: Ignition Timing for Austin Healey 3000 Mark I, II and III.

We have received many requests asking for the actual crankshaft pulley measurements necessary for adjusting and checking the ignition timing.
We would like to advise you that the corresponding distance from the T.D.C marking on the crankshaft pulley is as follows:

5 degrees - 17/64" (.265625 or 6.747 mm)
10 degrees - 17/32" (.53125 or 13.494 mm)
12 degrees - 21/32" (.65625 or 16.669 mm)
15 degrees - 51/64" (.796875 or 20.241 mm)
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Cheers,
John
 
Thanks for the input. I thought that .25 inches would equate to 5 degrees.

Really appreciate all of the excellent advice that this forum provides.

Ray
 
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