Should ignition timing be locked out for drag racing? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 05-03-2008, 03:04 PM
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Should ignition timing be locked out for drag racing?

I am trying to decide if the ignition timing should be locked out on a ford 347. This is in a 70 mustang with 4.11 gears and a 3000 stall converter. The engine has edelbrock victor jr. heads and intake with a comp cams 288R solid roller cam. Since the timing would generally be all in by 3000 anyway would it be beneficial to just lock the timing at the full advance? 3000 stall would mean that the engine doesn't see significant load until then right? What would be the advantages and disadvantages of doing this?

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Old 05-03-2008, 07:42 PM
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Quote:
Originally Posted by chevyv8_power
I am trying to decide if the ignition timing should be locked out on a ford 347. This is in a 70 mustang with 4.11 gears and a 3000 stall converter. The engine has edelbrock victor jr. heads and intake with a comp cams 288R solid roller cam. Since the timing would generally be all in by 3000 anyway would it be beneficial to just lock the timing at the full advance? 3000 stall would mean that the engine doesn't see significant load until then right? What would be the advantages and disadvantages of doing this?
Typically a full up drag engine uses either a locked advance or a lot of static with a small amount of centrifugal.

If you go this way, it's a good idea to put an ignition kill switch in the car, class rules may require this anyway, this lets you crank it up without spark then put the spark on after it's had a few revs. This takes a lot of load off the starter and reduces backfires when cranking.

Bogie
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Old 05-04-2008, 01:33 PM
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Is my thinking right then that when the stall converter is to the point where all the timing would be all in anyways that you could lock out the timing?
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