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Aug 29, 2006 15:57:44 GMT
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howdy do peeps I'm havin a bit of trouble ! as you know I'm building a fast road motor for the scud the spec is as follows bottom end lightend n balanced sk5 cam ported head 4 into 1 bunch of bananas manifold and twin 40 dcoms now heres the question the distributor runs a vacume advance n retard but dcoms have no provision for this do i just remove the advance vac unit and try it??? or find a distributor of a "works" skoda rally car (rare as poor quality wobbly children's play ponys do do ) or find a company which will re curve the advance with the bobweights not using the vac  |
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Aug 29, 2006 16:50:29 GMT
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tap a hole into the manifold mate - or just not run it, i never
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Aug 29, 2006 16:52:28 GMT
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Looks a fuggin ace piece of kit there! ;D Don't think you usually use vac advance with webers, just block up the tap in the dizzy  |
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Aug 29, 2006 17:28:36 GMT
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Don't try and tap the vacuum in, you'll get the wrong vacuum for the advance. Blank it off and run a couple of extra degrees advance. Depending how leery your cam is you can modify the advance/retard weights, but I'd get a pro to do that. It might be easier to nab some weights out a different dizzy that fits in the same hole ie Bosch, Lucas etc.
Jonny's backyard advice though: I got a modified dizzy, run jets by the book and time it by ear and it runs fine. You'll be able to tell if the timing is wrong, mine is very sensitive.
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Aug 29, 2006 17:35:36 GMT
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electronic ignotion? aldon or something?
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"quote hairnet"
I'm not paying nine pound for a pi$$!
[/quote]
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slater
Club Retro Rides Member
Posts: 6,390
Club RR Member Number: 78
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advance n retard with dcoms?slater
@slater
Club Retro Rides Member 78
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Aug 29, 2006 18:14:24 GMT
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I don't run vac advance on any of my cars, its only relly there to help the idle. On a lucas dizzy you can remove the vac unit and then braze/solder up the machanism so it cannot move.
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Aug 29, 2006 19:02:38 GMT
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ive been told the early favorit ran electronic ignition 89 to 91ish but I'm having trouble finding an early one in the scrapyards round here
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Aug 29, 2006 19:03:19 GMT
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^^^ As slater says.
It helps idle and low speed running but its not really needed and does nothing above around 3000 RPM. The mechanical advance is the only one that matters and a lot of rally cars used to run with that bypassed in years gone by.
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