Re: IML: Electronic Ignition

[PAUL WENTINK <randalpark@xxxxxxx>]

My cars all have the original ignition and none of them spark knock or 
ping. My biggest fear is damage to the heads via valve recession, which 
is a real problem and will happen.

If you can't tune your car to run correctly with the original ignition, 
changing to electronic ISN'T going to solve the problem. There is 
something else wrong here, and it needs to be fixed. You may simply had 
the points gapped incorrectly, have a loose timing chain, overheating 
problem, vacuum leak, carbon build up in the combustion chambers, 
clogged carburetor, loose rod bearings, etc.

It is true that today's gas is not suitable for our cars, but they can 
be adjusted to run on it without spark knocking or overheating. If you 
have already done the heads, then presumably you have hardened valves 
and valve seats, as well as lowered the compression ratio. It is 
possible that the original vacuum advance unit has been replaced at 
some point with an after market part. These are usually adjustable and 
need to be according to specifications.

I'm not there, but my best guess from afar is a lean situation due to 
vacuum leaks. That's what I would be looking for. The more time you 
spend under the hood, the more you will learn and find out about the 
running of your automobile.

Paul W.


-----Original Message-----
From: Geoff Fors <wb6nvh@xxxxxxxx>
To: mailing-list@xxxxxxxxxxxxxxxx
Sent: Tue, 9 Oct 2007 6:22 pm
Subject: IML: Electronic Ignition



One of the reasons I was thinking about converting to electronic 
ignition on
my '67 is that the Mopar Direct-Connection style electronic ignition
conversion kit has an adjustable vacuum advance. I have a terrible time
with pre-detonation (pinging) even with supreme brand gasoline and 
retarding
the timing isn't a very satisfactory solution, particularly considering 
how
far it has to be retarded. I have tentatively determined that the 
pinging
is caused by the vacuum advance curve being too aggressive for today's 
fuel.

I have already converted the heads to unleaded and don't want to replace
pistons and head gaskets in a project to lower the compression, so I am
looking at distributor advance solutions.

What have others done regarding the predetonation issue?

Geoff
Monterey CA


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