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Stationary Engines Discussion Forum

Re: Understanding how the coil works on an onan 2 cylinder

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Bob

10-27-2011 06:57:00
64.255.159.192



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It is a "waste spark" system. Both spark plugs fire at the same time... one on it's cylinder's compression stroke and the other on it's cylinder's exhaust stroke (where the spark is "wasted").

The secondary winding is NOT grounded at one end or connected to the primary (as it is in typical ignition coil).

A lead from each end of the primary winding goes to to a spark plug. One fires with a positive-going pulse and the other with a negative-going pulse.

MANY automotive engine from the 80's up use the same type of system, having half as many coils as there are cylinders.

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LJD

11-11-2011 04:30:32
67.142.130.11



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 Re: Understanding how the coil works on an onan 2 cylinder in reply to Bob, 10-27-2011 06:57:00  
About your comment "A lead from each end of the primary winding goes to to a spark plug"

Is that a typo? I assume you mean the plugs are hooked to each end of the secondary windings?



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ejensen

10-27-2011 09:55:51
67.183.217.224



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 Re: Understanding how the coil works on an onan 2 cylinder in reply to Bob, 10-27-2011 06:57:00  
Bob,

Thank yor for the information. A regular coil with one wire and primary wire to the points would not work, provided I understand your explanation. Another question: Removal of the flywheel:I've used two pry bars and a brass drift to strike a blow with a hammer on the crankshaft nut. What is the proper type of puller?



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