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Old 06-09-2003, 07:08   #1 (permalink)
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confused Timing for Clevo

Put new cam in ( COME CLH 575 524/552 lift) but its running rough as with no power.
Cam Timing was set at neutral after degreeing in cam and new Rollmaster timing gears and chain.
Tried ignition timing at 15 degrees adv BTDC but wont rev so advanced it to 30 BTDC and it idles OK but is backfiring on the road with only minimal increase in performance.

What sort of timing should I run with this cam? Also, what heat range of plug and plug gap?
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Old 06-10-2003, 01:54   #2 (permalink)
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Timing should be around 24-28deg total. Distributor has 14 deg initial. So thats 10-14 deg on the harmonic balancer.

You might find the cam timing isn't quite right?

As for plugs if the compression is high ie 10:1 run a hotter plug. I run Bosch H9BC's plug gap standard 0.9mm.

Try disconnecting your vacuum advance when you do the timing.

Also try taking it for a run without vacuum advance @ all.

My own car and my mates cars don't run vacuum advance at all. A mates panelvan runs a similar cam to yours.

Otherwise check for vacuum leaks around the manifold.

Brenden
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Old 06-10-2003, 06:20   #3 (permalink)
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mixtures
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Old 06-13-2003, 01:11   #4 (permalink)
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I've got that camshaft & no vac advance and am running 17 initial total around 32 on lpg no pinging
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Old 06-13-2003, 02:11   #5 (permalink)
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Thanks fellas. Also see my post about lifters not pumping up. I'm pulling them out tonite to install 2 new ones.
After that I will see how it runs and do some experimenting with the timing.
Indications are that its advancing to about 35 total (with vacuum advance blocked off) from 10 initial and therefore the distributor may need regraphing.
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Old 06-13-2003, 07:06   #6 (permalink)
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don't forget mixtures. sounds like it could be lean. if its not timing.
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