stretch
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| posted on 25/6/07 at 11:10 AM |
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timing
what should the timing on a kent be more/less at idle?
at the moment mines at TDC (just guessed a spot with assembly)
should i run the vacuum advance on the 40's Dellorto's? the electronic dizzy does have its own centrifugall advance as well?
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MikeRJ
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| posted on 25/6/07 at 11:23 AM |
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If you have a standard 1.6 the static timing should be around 10degrees BTDC.
Vacuum advance is almost always beneficial for part throttle economy, but most people don't bother with it when running DCOE's as
it's more difficult to get a a stable vacuum signal (tapping into just one port will give a fluctuating vacuum that can cause the timing to jump
around).
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stretch
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| posted on 25/6/07 at 11:36 AM |
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timing
no, mines not standard its running 60th oversize, the DCOE's, BCF3 cam and oversized valves, ported etc
a friend has the same setup and i had a look at his over the weekend and its also running at around 10degrees on idle
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TangoMan
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| posted on 25/6/07 at 01:27 PM |
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I would suggest getting a dizzy modified to suit the advance curve that your engine will now need as this will not be the same as standard.
While doing this you can have the part throttle advanced up to do away with the vacuum advance unit. As has been said, on a standard dizzy this helps
a great deal with part throttle economy.
After spending money tuning the engine you need to ensure you haven't then restricted it with poor timing so either get the dizzy sorted or go
for Megajolt which will allow you to have 3d mapping.
Summer's here!!!!
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caber
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| posted on 25/6/07 at 05:16 PM |
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Here's a daft question. would it be possible to replace the vac advance with a mechanical linkage from the accelerator that advances the dizzy
as you lift off the throttle? Has anyone ever done this?
caber
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MikeRJ
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| posted on 25/6/07 at 06:41 PM |
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Possible certainly, but vacuum depends on both RPM and throttle position, so it would be a bit tricky to get an equivalent igntion "map"
(e.g. say at 2000RPM you go from half throttle to full throttle, vacuum would barely change, but at 6000RPM it would make a much larger
difference).
Best option is to lob the distributor in the bin and fit a distributorless system!
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TangoMan
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| posted on 25/6/07 at 07:15 PM |
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quote:
Originally posted by caber
Here's a daft question. would it be possible to replace the vac advance with a mechanical linkage from the accelerator that advances the dizzy
as you lift off the throttle? Has anyone ever done this?
caber
You could, but why would you??? The advance requirements vary with load so you need to be able to take account of revs and throttle position to get a
sensible map.
Summer's here!!!!
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