Hi Terry,
Thats an old drag racing trick.
When you run a car on the verge of detonation the load on the engine is not so
great in the lower gears and you get away with it till top gear with no more
gear reduction plus extra wind resistance etc pushes it over the top.
An old trick I used with dual points was to ground the trailing set off the
line in the lower gears. Ungrounding them via a shifter mounted switch with
the shift to top effectivly retarded the timing due to more dwell now in
place. The amount of retard was adjusted by point gap, not a bad trick. Cost
was wire and switch. Modern electronic bits that do the same cost heaps more.
Not an LSR trick though.
Chris Harris...........................NZed.
I was told that it may improve your 60 foot time because the cool
aluminum combustion
chamber can take more advance. Through the rest of the gears in a 1/4
mile the timing
is "correct". Nothing said about iron heads so I suspect it's limited to
all out race motors.
Remember I'm just reporting what I heard.
Bryan
Terry Hunt wrote:
> I hope someone from the list can enlighten me on the value of retarding
>ignition timing to get more mph. I have heard it's done in high gear. I'm
not
>sure how many degrees is typical and I'd like to know why it helps, if it
>does. Thanks. Terry Hunt, Guam Bomb, #743
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