I have a GP3 cam and 9.5 compression. Per the Triumph competition prep
manual, I brough the static timing back to 10 BTDC, for a total max
advance of 30 degrees. I unhooked the vacuum retard and advance.
Haven't had any problems with detonation, and the engine seems to have
plenty of power. I've blown a piston in the past due to detonation, so
I tend to be cautious with this!
Tim Holbrook
1971 TR6 (soon to be housed in a garage with electrical hookups, so I
can finally get it tuned up and back on the road!!)
--- Peter Macholdt <vze2846b@verizon.net> wrote:
> Well, it is almost time to fire-up the 250 after this winter's engine
> mods.
> Guess this will tell if I got all the parts back in the right way.
>
> My question has to do with timing the engine. Since the head is
> shaved and
> I have a GP2 cam, the original timing specs are history. I seem to
> remember
> that in order to tune to best performance, I need to advance the
> timing
> until I just get some pinging and run-on while shutting off the
> ignition.
> Then I back-off the timing about 5 degrees.
>
> Did I remember this correctly, or completely goof-up?
>
> TIA,
> Peter
> '68 TR250
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