[TR] distributor advance
tony at tonydrews.com
Thu Feb 27 18:08:07 MST 2020
The springs should just change what RPM it takes to get to full advance
but the full advance should be the same (weights against the stops).
I'm a little unclear on how much you changed the timing, it sounds like
you had to retard the timing after the spring replacement - this would
also retard the "all in" timing, which would be what you're running at
3200 RPM. It's possible it's worse at 3200 now than it was before
because the full advance timing is now less.
I don't run a street car so could be all wet... When I check the timing
I see what it is once the advance is all-in. Wherever it ends up at
idle is where it ends up, I don't really pay attention to the idle advance.
With 110 octane gas and decent compression (and a 4 banger, not a 6
banger), I shoot for 32 degrees when the advance stops changing. I'd
think you'd want closer to 26 degrees with a street motor / pump gas.
Hope this helps...
Regards, Tony Drews
On 2/27/2020 5:48 PM, Peter Arakelian wrote:
> Have an early 71 TR6, still has the 41306 distributor with dual
> vacuums, advance and retard. Did a little work on my distributor,
> wanted to check the function of the mechanical advance since I came
> across a new set of advance springs. I know they are correct because
> they are Lucas and the correct part number as listed in the Lucas
> master catalog.
> the old springs were visibly different and softer. The weight in my
> distributor was marked 13 degrees. After I changed them, my timing at
> idle advanced 10-15 degrees. I reset the timing to 8 BTDC. I have
> always run there. I use the advance 'till it pings and back off
> method. Have had it as much as 10 BTDC with no ping, but I prefer to
> run at 8. My retard works correctly, because it passes the test -idle
> increases 300rpm when pulled. Still no ping under the test - high
> gear, full throttle 30-50 mph. And no ping accelerating at full
> throttle from 70-80.
> Now...am I correct in thinking the car should run better at speed
> (3200rpm)? My thinking is that the timing is more advanced at that
> rpm with the correct springs, than it was previously.
> Peter Arakelian
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