The Triumph Dolomite Club - Discussion Forum

The Number One Club for owners of Triumph's range of small saloons from the 1960s and 1970s.
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 Post subject: Timing chain sprockets.
PostPosted: Sun Apr 07, 2019 10:05 am 
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If you look at the Sprint timing chain sprockets with the timing cover removed, you can see that there are roughly twice the number of teeth on the camshaft sprocket as there is on the crank sprocket. Entirely reasonable as the valve gear runs at half engine speed.
Now looking at the jackshaft sprocket this is a size roughly half way between the crank and camshaft ones.
Intuitively shouldn't that also be the same size as the camshaft sprocket as the distributor also runs at 1/2 engine speed ?
It obviously works in practice.....
Or am I having a(n) (early) senior moment ?
Thanks, Tony.


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PostPosted: Sun Apr 07, 2019 10:41 am 
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Location: Halifax, West Yorkshire
That would depend on the gearing between the dizzy shaft and the jackshaft?

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PostPosted: Mon Apr 08, 2019 4:25 pm 
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Ah yes ! Of course ! Thankyou. That must also mean the 2 gears are not a 1:1 ratio.
I'll see if I can work out what is going on just as a matter of interest.
Cheers for now,
Tony.


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