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Dizzy question including timming help needed!

Posted: 20 Apr 2007, 18:15
by The_blue
I got a 2nd hand electronic dizzy for my CU engine. It came with all the wiring and 2 rotor arms...


one has a wide tip (about 10mm?) and the other was narrow (5mm?) both fit and i've run em both. It seems to run better with the wide one.......




......whick brings me to the timming. The haynes says 6-8 'A'tdc for electronic. I set it to that and it was fine for a while (a week or so)... then it was poping and sluggish so i checked the timming again. Was now 6 before!! I set it to 6 after and it wouldn't rev, sounded a mile out.

I've ended up seting it by ear and it runs better than ever (with the wide rotor arm)


What are the right settings?

Timing done without carb vaccume.

Posted: 20 Apr 2007, 19:25
by toolsntat

Posted: 20 Apr 2007, 19:41
by HarryMann
Blue, if that raises any additoonal questions fire away...

Posted: 20 Apr 2007, 19:46
by The_blue
Didn't see anything about the rotor arms.

Any ideas on that?

Posted: 20 Apr 2007, 19:47
by HarryMann
Think I'm going to Wiki that thread Tools'n put up, seems to contain the very essence of the matter after a lot of research by various souls...

Posted: 20 Apr 2007, 19:50
by toolsntat

Posted: 20 Apr 2007, 19:52
by HarryMann
Well, the wider ones would stand a better chance of being in the right place at the right time, but also of arcing. If the dizzie timing is pretty well where it should be, it shouldn't matter too much I reckon.. maybe check which is the later part, if they're both VW

Posted: 20 Apr 2007, 21:17
by cumbriankeith
I thought the wider ones have an inbuilt rev limiter (5400 rpm) - mine works like that anyway tho I seldom rev it that high as it just feels wrong go to me.
http://shop.justkampers.com/advanced_se ... &x=41&y=13

Posted: 20 Apr 2007, 21:56
by HarryMann
So the difference isn't just in the width then...

so never mind the quality, just feel the width :wink:

Posted: 21 Apr 2007, 07:52
by toolsntat
Hope this is aint getting boring but there`s some real techy stuff here....
http://archive.club8090.co.uk/viewtopic ... t=struggle
Maybe another bit for the wiki???

Posted: 22 Apr 2007, 23:56
by HarryMann
Thanks toolsn'

How's this for a Wiki synopsis of what's been said in all these historical trreads

http://wiki.80-90.co.uk/index.php/Petro ... rd_systems

Let me know if I have missed any important contributions - thanks

Posted: 23 Apr 2007, 08:28
by toolsntat
Thanks for taking the time to wiki that lot Harryman... :ok

If I see other bits of useful info I`ll tag a link on here...

The_blue, hope this has been of use and you are getting things sorted...

Posted: 23 Apr 2007, 08:51
by HarryMann
Nice to actually have the info from members to fill the wiki out where needed - now I just need a few matchsticks for the old eyelids :wink: