[AT] Starting Issue with MH Pacer

[Darrell Ratliff]

You have it right Alan.

From: Alan Riley 
Sent: Tuesday, September 02, 2014 1:48 PM
To: Antique tractor email discussion group 
Subject: Re: [AT] Starting Issue with MH Pacer

Well, I knew I shouldn't have posted this late at night.  After a
couple of cups of coffee this morning, I reread it and realized 
the last 2 paragraphs are backward from how I meant for them
to read.

Suffice it to say, when the points are gapped too wide, they open 
sooner resulting in the ignition timing being advanced.

Also, when  the points are gapped too close, they open later resulting
in the timing being retarded.  This is the same effect as when the 
rubbing block wears down.

Now if I still have it messed up, fire away!  I can't run any more 
but I can still duck!

Alan



-----Original Message----- 
From: Alan Riley 
Sent: Tuesday, September 02, 2014 12:39 AM 
To: Antique tractor email discussion group 
Subject: Re: [AT] Starting Issue with MH Pacer 

Incorrect point gap will affect ignition timing.  When the points open 
with respect to crankshaft position determines when the spark is 
delivered to a particular plug.  Point gap determines the location on 
the ramp of the distributor cam lobe at which the points open.  

If they open further down the ramp from the peak of the lobe than
they should, then ignition timing is retarded since the crankshaft 
has rotated an additional amount before the spark occurs. 

Conversely, timing is advanced if the points open nearer to the 
peak of the lobe than they should.

Alan





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