Ive recently got my turbo 202 going and have got a surge/miss in the upper rpm. No matter what timing, fuel curve, a/f ratio (from 11.0 to 12.0) etc I change it doesnt alter it. It sort of revs then pauses then revs again sometimes with a faint miss. I have been researching and found that some people run better with the points setup. Ive also read about using a plastic drive gear on the dissy? Just wondering some thoughts? Thanks
Points ignition or stick with electronic dissy
Started by
_rb3torana_
, Oct 06 2012 12:49 PM
12 replies to this topic
#2
_STRAIGHTLINEMICK_
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Posted 06 October 2012 - 01:07 PM
Ive recently got my turbo 202 going and have got a surge/miss in the upper rpm. No matter what timing, fuel curve, a/f ratio (from 11.0 to 12.0) etc I change it doesnt alter it. It sort of revs then pauses then revs again sometimes with a faint miss. I have been researching and found that some people run better with the points setup. Ive also read about using a plastic drive gear on the dissy? Just wondering some thoughts? Thanks
The Bosch electronic will do the job if it is in good cond with the correct advance curve.I would only change the distributor to prove a fault.The plastic drive gear should'nt affect your timing unless it is worn or damaged.Mick
#3
FastEHHolden
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Posted 07 October 2012 - 11:47 AM
The only times I've had problems, it always gets traced back to the module....make sure its got the correct grease under the module...and if you have tried everthing else...replace the module.
#4
_Bomber Watson_
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Posted 07 October 2012 - 12:16 PM
Lots of people fit the steel drive gear off the oil pump to the dizzy to stop the plastic gear shearing.
This seems to cause some chatter and stray spark.
All factory holden six dizzies had a plastic gear TMK
This seems to cause some chatter and stray spark.
All factory holden six dizzies had a plastic gear TMK
#5
FastEHHolden
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Posted 07 October 2012 - 05:41 PM
They used the steel gear on the dissy up to HQ , I beleive.
From memory the VK service manual says its plastic so if the dissy jams...the gear breaks.
From memory the VK service manual says its plastic so if the dissy jams...the gear breaks.
#6
_Bomber Watson_
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Posted 07 October 2012 - 05:42 PM
Well there ya go ^
Hang on, i have two 186's sitting here pre HQ that had plastic drives on the dizzies?
Cheers.
Hang on, i have two 186's sitting here pre HQ that had plastic drives on the dizzies?
Cheers.
#7
_Crooner_
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Posted 26 December 2012 - 07:21 PM
From memory isn't this why we used twin point dizzys?
That was the first thing we did after balancing and blue printing. It has been a while I must say but I always though points were better at high revs
That was the first thing we did after balancing and blue printing. It has been a while I must say but I always though points were better at high revs
#8
rodomo
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Posted 26 December 2012 - 08:06 PM
Yep. Correct for the era. Twin points allowed for more saturation time on the standard coil. (Points were closed longer, therefore producing higher spark voltage)
But................electronic dissys put less load on the shaft compared to twin point and acheive the same purpose.
But................electronic dissys put less load on the shaft compared to twin point and acheive the same purpose.
#9
_Emu_
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Posted 26 December 2012 - 08:26 PM
Correct. Points are dated rubbish.
Removing a Bosch electronic dizzy for a points dizzy is madness....
If it is an ignition issue then try another electronic dizzy, module, plugs, plug gaps, leads, coil.....
Removing a Bosch electronic dizzy for a points dizzy is madness....
If it is an ignition issue then try another electronic dizzy, module, plugs, plug gaps, leads, coil.....
#10
Uncle Chop Chop
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Posted 26 December 2012 - 08:46 PM
Points work if maintained correctly. Electronic ignitions are generally more reliable. I prefer the latter.
#11
_oldjohnno_
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Posted 26 December 2012 - 09:04 PM
Ive recently got my turbo 202 going and have got a surge/miss in the upper rpm. No matter what timing, fuel curve, a/f ratio (from 11.0 to 12.0) etc I change it doesnt alter it. It sort of revs then pauses then revs again sometimes with a faint miss.
Valve springs adequate for rpms & boost level?
#12
_tryhard_
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Posted 26 December 2012 - 10:14 PM
what sort of carby are you running sounds like a powervale opening and closing or fuel being too rich. the elec dissy also has some problems when wear is a facter if you can get hold off a snapon timing light rev your motor up to 4000 revs look at timing mark it should be all in by then rev to 4500 to5000 rpm if timing still advances you dissy weights are moving around too much just service the dissy and add a bit off weight to the dissy weights & tighten up your secondary spring in the dissy also what timing are you running.
#13
_stretchlc_
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Posted 27 December 2012 - 12:04 PM
I'd say at a guess its blowing the spark out under higher boost.......gap your plugs down to about .025" and let us know how it goes!
Edited by stretchlc, 27 December 2012 - 12:09 PM.
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