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  #1  
Unread 05-24-2019, 08:48 PM
Gary Gary is offline
Unloading the TZ from the trailer
 
Join Date: May 2007
Location: UK
Posts: 27
Default Electrex Ignition

Has anybody got a good guide on the ignition timing using this ignition?
It has been fitted to a TZ350 G and using the recommended timing of 3mm (0.125") BTDC we seem to be getting a bit of detonation. The mixture looks about right, shinny black on the crown. The fuel is a 50/50 Avgas/ super unleaded which is a mix used for many a year. Currently on 260/270 main jet with 50 power jet. I am looking at retarding the ignition a bit so hoping somebody can give me a bit of guidance. Thanks Gary.
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  #2  
Unread 05-25-2019, 09:40 AM
Twinshock750's Avatar
Twinshock750 Twinshock750 is offline
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Join Date: Feb 2007
Location: Auckland NZ
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I'm running that ign at 3.2mm 0.8mm squish on 100% low lead av gas. Using the 68C130 (I think) black boxes)

What is your squish? And does the squish angle exceed the piston dome angle?

Deto is regularly trapped air fuel mixture.....less spark related.
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Unread 06-25-2019, 02:27 PM
170plus 170plus is offline
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Shiny black, with modern oils, isn't a good thing....it's lean.

The jetting you mention would be a bit lean for us in Aust/NZ, and most UK guys run richer again. Go to 70 or 80 in the power jet and see what happens.

What are the signs of your deto? Damage?

Kerry
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