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[b]HELP[/b] - timing without timing marks?
https://www.ausmini.com/forums/viewtopic.php?f=2&t=493		 Page 1 of 1
Author:  minidownunder [ Mon May 03, 2004 1:29 pm ]
Post subject:  [b]HELP[/b] - timing without timing marks?
Anyone got any good ideas as to how I can get an accurate check of timing on my Cooper S (Cyril) given the timing marks have been cut off the flywheel (along with a fair amount of metal). :?

I've lined up the keyway on the crank and incscribed new marks. I've checked with the light and these are within 5 deg of the current setting. But, if I adjust the timing (about 4 deg) using these marks to the stipulated 4deg BTDC then Cyril starts to labour somewhat. :x

I presume I've either got the marks out by a degree or two, or perhaps there's a non-standard cam? :evil:

Any ideas? :wink:
Author:  drmini in aust [ Mon May 03, 2004 3:37 pm ]
Post subject: 
I have the same problem- lightened flywheel. Luckily I have a belt drive kit- it has timing marks on the cover.. :)

2 solutions:
1. put a late Clubbie timing cover on it- it has marks there too....

or,
2. Forget the static marks- just advance until it pings a little then retard it a fraction. The original timing specs for leaded fuel are no good now anyhow, and who knows what cam it has... that will affect it too. :wink:
Once it is running right, just put a mark on the flywheel (use white paint pen) for the strobe light.

Mine runs 35* total advance at 4500 rpm. I have a mark on the crank pulley, and another on the timing case, at 35*. (my dizzy has a 10* advance cam- that's 20* at crank).
That's about 15*static advance running 98 octane. :P
Author:  Anto [ Mon May 03, 2004 3:41 pm ]
Post subject: 
Speaking of dizzy advance curves, what is the difference between say 10* built in advance on a dizzy and say 12* or 9*? Hammill's book Performance Tuning Minis on a Tight Budget says to always get a 10* dizzy, but he never says why.

Anto.
Author:  drmini in aust [ Mon May 03, 2004 3:52 pm ]
Post subject: 
Won't matter on most motors. 10* was pretty common in 45Ds, thru the 70s. I've got 3 of 'em.. :wink:
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