Without knowing the octane rating of the "regular" fuel that you are going
to use it is difficult to be very precise about the timing. With 97 octane
(research method) 4 to 6 degrees static tiiming with total advance of around
30 to 34 degrees all in by 4500 rpm should be close. The more advance that
you can run without pinging at WOT, the better will be the performance and
fuel economy. I assume that you are not using any vacume advance. The
timing at idle won't make any difference to the way the car runs. But it
will probably work out to be around 8 to 10 degrees at 750 rpm which is
where the engine combination should idle well.
Regards,
Greg Solow
The Engine Room
Santa Cruz, Ca.
----- Original Message -----
From: Peter Vucinic <vucinic@b140.aone.net.au>
To: Friends Of Triumph (E-mail) <fot@autox.team.net>
Sent: Monday, July 10, 2000 6:34 AM
Subject: TR4 distributor Advance Curves
> Does anyone one on the list have experience, figures or running similar
setup on the approximate: -
>
> 1. Static Ignition Timing
> 2. Idle Advance Timing
> 3. Distributor Advance Curve
>
> that will give a starting point for a TR4 engine bored out to 87mm, 9:1
Compression ratio, Running on LEADED/REGULAR Fuel, 45DCOE Webers (34mm
Chokes, 4.5 aux. vents), Large Inlet and Exhaust Valves, 'Mild' Cam (70/30
Grind), STD Lucas 25D Distributor (Converted to Electronic Ignition), NGK
BP7ES Spark Plugs, TR4A Headers.
>
> Any assistance/information is greatly appreciated.
>
> Kind Regards
> Peter Vucinic
> WORKS-4 TR4
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