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Post by heartnut on Aug 31, 2016 19:12:04 GMT
I fitted a *****BBC electronic ignition and the ignition timing point changed and now I am plagued with overheating. I have been trying for months to set the timing by ear and by static but no solution. Interesting fact: it will idle indefinitely without overheating but not if I try to go anywhere.
So I bought a Gunsons Advance timing light. And the question is.... How is it possible to point the gun and one of my eyes at the pulley marks at the same time? Being a contortionist is a basic requirement of bug ownership I know, but this is ridiculous. It's nearly possible to see from the drivers side, eye through the hole where the heater pipe goes through the body, but the strobe light is partially blocked by the rad top hose.
Is there a technique with a mirror, maybe? And anyone else had overheating related to ignition timing with those leccy ignitions?
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Post by Stiffy on Aug 31, 2016 19:28:33 GMT
Maybe you can time it using the lower timing marks and get a friend to turn the dizzy. failing that scrap the electronic ignition. mine was bloody useless.  |
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Post by heartnut on Sept 1, 2016 9:08:36 GMT
Where are the lower timing marks? How do they work? I know there is a better view from underneath.
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Post by Stiffy on Sept 1, 2016 18:57:53 GMT
There is a moulded V on the engine casing. You can feel it (sticks up a couple of millimetres). :-)
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Post by heartnut on Sept 1, 2016 20:02:09 GMT
I had a look, and I don't have anything marked down there that I can see. If there was, would it be found 180 degrees from the upper timing mark? If I could mark that myself, how to go about timing at 100+ degrees from TDC?
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Post by Stiffy on Sept 1, 2016 21:19:00 GMT
Yes it will be 180 degrees round the circle. I will post a picture of mine tomorrow.  |
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Post by Stiffy on Sept 3, 2016 19:15:35 GMT
 Heres a photo of mine. :-) |
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Post by heartnut on Sept 3, 2016 20:56:24 GMT
What a lovely big marker. I wish I had one. My 1973 700cc is bald in that area. But thanks for taking the trouble. Anyone want to buy a timing light? Hardly used.
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Post by heartnut on Sept 3, 2016 21:01:45 GMT
And furthermore!
Am I just unlucky and am just failing to find that sweet spot at which the engine won't boil under load, or has anyone else experienced a S____bbc installation which is untimable? Setting up at 10 before TDC and the rotor arm is practically fully past the red gizmo at the point where the engine runs best. Does that sound right?
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Post by tod on Sept 3, 2016 21:43:10 GMT
I had a similar problem with a new points dizzy that I bought . I suspected the drive peg at the bottom had been drilled in the wrong place (which was denied by the supplier) . They eventually agreed to exchange it and surprise surprise they agreed it had been wrongly assembled , so perhaps yours has the same problem . I could not turn it enough to get the timing right . The vacuum advance fowled on either the engine block or bodywork .
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Post by vannin on Sept 4, 2016 18:33:39 GMT
lumenition magnetronic, fit it and forget about it
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Post by heartnut on Sept 4, 2016 19:12:31 GMT
I did buy the dizzy from the same source and it is really a bit skewed re: the vacuum advance close to the engine.
I am also trying to find the best jet for a Weber carb, and its possible the biggest one I've got is still a bit skinny for the engine.
Is it possible that my problem, that it idles OK but overheats under load because the main jet is providing a weak mixture?
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Post by vannin on Sept 4, 2016 19:16:48 GMT
which weber have you fitted to your bug heartnut ?
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Post by heartnut on Sept 5, 2016 15:59:03 GMT
32ICH on a 700cc. Main jet 100 was dire, with no acceleration, just a gasp from the engine. Worked up to 125, which is much better. Anyone have any memory of what size works best?
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Post by heartnut on Sept 22, 2016 20:27:52 GMT
Working now with a 135 jet which seems good. The overheating is noticeably less of a problem and engine has plenty of hoomph. But is that actually that the temperature of Autumn has stopped the overheating? I was in trouble with the temperature at 27 degrees but not now at 17. Maybe it's that.
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