[TR] Dieseling and pinging

[Tony Drews]

I'm not going to go into how to actually SET the ignition timing, but 
having too much advance in the timing will certainly cause the 
pinging and dieseling and will eventually melt important things 
inside the engine.  Higher octane fuel will allow a bit more advance 
to be used, and will then also produce a bit more power.  The 
carburetion also plays a part in this.  Both should be set "properly" 
to make it run right.  I'm sure others will chime in with what the 
"proper" settings would be.

- Tony Drews

At 08:45 PM 9/30/2009, Wayne wrote:
>I just got the TR6 on the road after an engine rebuild.
>The head was shaved to raise the compression and I know this may cause
>pinging.
>Engine was started with high octane fuel and ran fine, but after a few days, I
>filled up with
>regular fuel and I am getting pinging when accelerating.
>My question is do I have to run high octane fuel or fuel additives or can I
>adjust the ZS carbs?
>The engine also keeps running after I turn it off, I think this is called
>dieseling.
>What causes this? Will carb air/fuel adjustment fix it?
>I also tried to check the timing with a timing light, but what I found didn'y
>make sense to me.
>I set the static timing before the initial start-up @ 12 BTDC and the engine
>started right up :).
>After driving the car, I thought the acceleration was underpowered, so I tried
>timing the engine
>with a timing light, with engine @ idle 800 RPM, and the vacuum advance still
>attached,
>I was no where near 4 ATDC. And when I tried to rotate the distributor to
>advance the timing
>to 4 ATDC, the engine would run rough. I ended up rotating the distributor the
>opposite way
>and ended up at around 10 BTDC.???? I went by sound not by what the light
>showed me.
>Does this make sence? I also removed the vacuum tube from the advance on the
>distributor
>and it did not make any difference to the idle? Should I be concerned that my
>vacuum advance is not
>working?
>
>Any info on this will be apprieciated.
>
>Wayne
>73 TR6
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