Trevor Boicey wrote:
>
> Bob MGT wrote:
> >
> > I had been having some pinging lately on my '71 MGB. A quick check of the
> > static timing showed 7 deg BTDC which is retarded compared to the book spec
>of
> > 10 deg (for the 18GK engine). I tried several different brands of premium
>gas,
> > but the pinging persisted. I finally broke down and bought a timing gun
> > (strobe light) and measured 20 deg BTDC @ 1500 rpm. The book says 15 deg. I
> > adjusted the dizzy for 15 deg and took it for a test drive. Happy days, no
> > more pinging! I now believe that static timing is only for ballparking from
> > scratch just to get the engine started.
>
> Well, if you have the same dynamic timing but a different static
> timing
> then something is "different" in your set up.
>
> Obviously the dynamic setting is what matters, but it all should be
> the same.
>
> For example, if your mechanical advance springs were weak, you'd get
> too much advance at too low of RPMs. That could explain your
> situation, and changing the static timing is only hiding the real
> problem.
Had exactly this on my roadster - had to set 7 degrees static and it still
pinked on
hills when hot. The thick advance spring had stretched to the point that it
wasn't
effective at all.
PaulH.
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