[Farmall] Oliver Cletrac HG Question

Jim Becker jim.becker at verizon.net
Fri Jun 17 11:04:24 PDT 2005


Nothing wrong with your explanation, except the implication that all systems 
prior to the modern distributorless systems were designed to put a negative 
voltage to the center spark plug electrode.

The lower compression ratios and narrower spark plug gaps of the time 
required less voltage to fire than typical modern engines.

Jim Becker        jim.becker at verizon.net

----- Original Message ----- 
From: <soffiler at myeastern.com>
To: "Farmall/IHC mailing list" <farmall at lists.antique-tractor.com>
Sent: Friday, June 17, 2005 11:49 AM
Subject: Re: [Farmall] Oliver Cletrac HG Question


> OK, Jim.  What does that mean?  The explanation I provided
> is in error, or, the magnetos of the time had more energy
> than the battery ignitions and thus cared less about
> polarity?
>
> Steve O.
>
>
> From: "Jim Becker" <jim.becker at verizon.net>
> To: "Farmall/IHC mailing list"
> <farmall at lists.antique-tractor.com>
> Subject: Re: [Farmall] Oliver Cletrac HG Question
> Date: Fri, 17 Jun 2005 10:18:10 -0500
>
> ----- Original Message Follows -----
>> The rotating magnet magnetos (like the H-4 and J-4 for
>> example) alternate  polarity of the spark with each
>> firing.  Two plugs always get a positive  spark while the
>> other 2 always get a negative.
>>
>> Jim Becker        jim.becker at verizon.net
>>
>> ----- Original Message ----- 
>> From: <soffiler at myeastern.com>
>> To: "Farmall/IHC mailing list"
>> <farmall at lists.antique-tractor.com> Sent: Friday, June 17,
>> 2005 8:39 AM Subject: Re: [Farmall] Oliver Cletrac HG
>> Question
>>
>>
>>
>> > (2)  You find "distributorless" ignitions on
>> > modern automobiles that often use one coil to fire two
>> > plugs simulaneously.  One of the sparks will be
>> > "backward" which goes against the principles described
>> > above.  However it works fine simply because modern
>> > ignition systems have vastly more power than the systems
>> used on old tractors.) >
>> > Steve O.





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