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kimber
United Kingdom
1529 Posts |
 Posted - 24/02/2008 : 19:51:06
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I wonder if someone has a P-type clutch cover (i.e. the bit with the toggles on) accessible and could measure the circumference of it for me, ignoring the flange which bolts onto the flywheel? A piece of string wrapped around it will suffice and then the length of the string in millimetres.
I have some rather confusing marks on the clutch/flywheel and want to start from scratch with TDC, ignition and valve opening points. I realise that these marks should ideally be on the flywheel, but unless you have some experience in gynaecology, this is difficult to achieve with the gearbox in situ. |
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John Reid
United Kingdom
704 Posts |
Posted - 24/02/2008 : 20:38:52
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Andrew,
Looks like 26.3" to me.
John R |
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Peter Scott
United Kingdom
1240 Posts |
Posted - 24/02/2008 : 21:19:39
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Andy
I have been struggling with the same questions. I had estimated a circumference of 26.7". This gives 1.48" for the 20 degree static timing.
John's 26.3", which must be more accurate, if his clutch is not attached to a gearbox, would give 1.46" for 20 degrees. Blower states that 20 degrees is "exactly 1.5in".
So I guess that the answer is "20 degrees is exactly 1.5" or thereabouts".
However marking the clutch cover is not an easy job, nor is squinting at the marks with engine running. So my next approach is to see if I can use the front pulley instead. Perhaps looking at the lower part of the pulley from underneath the car, with a timing disc fixed to the front face of the pulley. Just a thought at the moment. I have not investigated the practicalities yet.
Peter |
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DickMorbey
United Kingdom
3678 Posts |
Posted - 24/02/2008 : 22:22:34
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Andrew, happily (for your purposes at least) my gearbox is out of the car and I make the measurement of the circumference 26 5/16" or 26.31"
Regards
Dick Morbey, PA/B 0743
(PS my clutch is PA) |
Edited by - DickMorbey on 24/02/2008 22:23:08 |
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kimber
United Kingdom
1529 Posts |
Posted - 24/02/2008 : 23:19:08
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Most helpful, chaps, as always!  |
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