[ROVERNET - UK] Mixture problems-resolved, sort of...

Netspace vmitps at netspace.net.au
Mon Oct 22 08:10:51 BST 2007

If the Pertronix is not working correctly, it could have much too high a 
voltage drop across the switching transistor.
It should be 0.25V (normal saturated npn), but if it was 1v with a battery 
at 11.8v then you would have a weak saprk.  Flat batteries are 11.5v


----- Original Message ----- 
From: "David Read" <defender110 at ozemail.com.au>
To: <rovernet at lyris.ccdata.com>
Sent: Monday, October 22, 2007 8:23 AM
Subject: Re: [ROVERNET - UK] Mixture problems-resolved, sort of...

> At higher rpm's there is less time for the energy to build up between 
> firings, so a high resistance (in the ignition circuit) would be a greater 
> problem at high speed not better.
> I missed the bit about changing the coil, sorry.
> I would have to go for the lower voltage at idle, but even a dynamo in 
> good condition should produce a maximum voltage difference between idle 
> and full speed between 12 to 13.8 volts.
> The Kettering ignition should not be a huge burden for any electrical 
> system (approx 2 amps max. during dwell).
> The PerTronics setup seems to be merely a Hall effect type of points 
> replacement with roughly the same current characteristic as points. It 
> just switches much faster, producing a fatter spark.
> I did come across a mention of installation glitches in s Bosch dizzy.
> Not sure if it may be relevant here ...
> http://listarchive.type3.org/archives/1998/august/msg00097.htm
> Cheers
> Dave
> South Oz
> Steven Dibdin wrote:
>> "Or 3. The current is inadequate due to high resistance."
>> Hi PVS,
>> No.3 gets my vote. it runs well at higher RPMs but had a weak spark at 
>> idle. Suggests that the dynamo produced insufficiant juice at idle. 
>> Running nicely back on the points with the higher output coil. I'll call 
>> Petronix next week if I get five minutes and let you know what they 
>> think.
>> Take care,
>> StevenD
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