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Location:
Brisbane
Registered:
November 2003
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Re: 18rg electronic dizzy conversion?
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Sat, 10 January 2004 11:00
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Marked out my balancer with timing marks at 20 degrees and 36 degrees btdc (typical total ignition advance crank angle for *most motors).
Also measured mechanical advance available on both the elec dizzy and points. Both offer about 16degrees, which is 32 crankshaft degrees (crank turns twice for every dizzy rotation - 4 stroke). springs feel heavier in the points dizz but then the weights might be heaps heavier too.
Ran with the electronic dizzy to get an idea of what's going on. 20deg@2000rpm and 36deg@3500rpm (all in).
So in theory it should be working fine, frustrations 
Had no troubles with initial timing when i first swapped the dizzys. Set no.1 at tdc on compression stroke, took note of where rotor was pointing, pulled out old dizzy, put in new one in the same spot. Timing light showed about 5deg initial.
Thanks heaps for your help but I have absolutely no tags or markings on my points dizzy and unfortunately i know the rotor button's been replaced in the life of the motor. drats.
as far as i'm aware, the purpose of vacuum advance is to advance the ignition timing when the motor is under light load conditions, to aid in more complete combustion and prevent plug fouling, etc. etc. This system's meant to work off a ported vac source. Which simply means it's exposed to vacuum in the throttle bores just above the throttle plates. So at closed throttle there is no signal, then as the throttle is opened a little it gives vacuum, and once the throttle is opened further it again gives no signal.
Hence vacuum advance should do nothing to add to the WOT operation and total advance (ie. total advance is not centrifugal + vac.). I've ran a lot of modified non-japanese motors with purely mechanical advance systems with no probs, except carbon build up if cruising at low revs too much (a by product of large cams too).
But this doesn't help my cause, so maybe i'm wrong about the vac system on the rg? Although i never ran the vac on the points dizz.
At least the car wheelspins 3rd gear at 5000rpm now, not needing 7k like it used to
If anyone knows the factory advance figures for the different 18rg's it'd be great. Next thing to do is unloom the module and reinstall the points dizzy and see what happens - undoing work is never fun...
Now THAT is a long post 
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| | Subject | Poster | Date |
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18rg factory dizzys and timing
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pclabrat | Mon, 05 January 2004 09:01 |
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Re: 18rg electronic dizzy conversion?
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Norbie | Mon, 05 January 2004 12:14 |
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Re: 18rg electronic dizzy conversion?
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THE WITZL | Mon, 05 January 2004 16:03 |
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Re: 18rg electronic dizzy conversion?
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Grant | Mon, 05 January 2004 21:03 |
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Re: 18rg electronic dizzy conversion?
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clancey | Mon, 05 January 2004 23:22 |
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Re: 18rg electronic dizzy conversion?
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Steve M | Wed, 07 January 2004 01:42 |
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Re: 18rg electronic dizzy conversion?
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pclabrat | Thu, 08 January 2004 06:36 |
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Re: 18rg electronic dizzy conversion?
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BarniesRA40 | Thu, 08 January 2004 08:58 |
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Re: 18rg electronic dizzy conversion?
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Steve M | Fri, 09 January 2004 02:39 |
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Re: 18rg electronic dizzy conversion?
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pclabrat | Sat, 10 January 2004 11:00 |
