A distributor 'curve' is actually more like 2 lines a bit like this:
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Full distributor advance is all in by between 3,000 to 3,500 approx.
Despite all the multitudes & variables involved in distributor curves you
have to consider that when Aldon Automotive only stock 3 different
distributors (by advance curve) for the A-Series engine then you can see
nothing is too critical. Obviously it is beneficial to spend some and money
on a rolling road (Strangely enough Aldon's rolling road operators don't seem
to hot at present so I won't recommend them) to get the distributor dialled
in properly and if necessary (may not be) have the distributor advance curve
further modified.
Why not contact Peter Burgess (he has web site and e-mail advertised on the
MG BBS) and book the car in for a rolling road tune. His workshop is in
Derby so not a million miles from your part of UP North. I doubt very much
if you will ever regret spending the money on the rolling road and if I was a
betting man would wager you the price of the time on the road.
You know it makes sense.
Daniel
In a message dated 03/01/01 16:48:26 Pacific Standard Time,
guy@weller-lakes.freeserve.co.uk writes:
<< David,
I am a fan of Vizard, but don't find his chapter on ignition timing
terribly helpful.
He goes into great detail on what goes wrong if your timing is too
advanced (holed or melted piston tops) but dosn't go much into things
like the shape of the advance curve or how to set maximum advance, how
much and for what revs.
My strobe doesn't have an advance feature, it just flashes at the
moment of spark to No 1, so it is fine for setting near-static
(1000rpm) but I am going to have to mark up some extra crankshaft
pully timing marks for higher revs.
I am looking for advice over what max advance might be suitable for my
current engine set up. Standard timing just dosn't seem right to me.
"Just have someone else do it" - no one round here that I know of, and
anyway that would require a major and traumatic shift of psychology on
my part as my cars never go anywhere near garages for anything at all
other than the annual MOT test.
Guy
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