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Antique Gas Engine Discussion

IHC Tom Thumb


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  #1  
Old 08-30-2005, 09:47:22 PM
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Alan Fannin Alan Fannin is offline
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Default IHC Tom Thumb

Bought a TOM THUMB at Portland. Seems to be all there and in its work clothes. Can anyone tell me if the advance - retard lever is insulated from the rest of the engine. The lever has a fiber block and connection point for a wire but not insulated ,the exhaust push rod also has a wire connection point and a metal strip that is in contact with the cylinder except when the push rod is holding the valve open. This setup would only keep the buzz coil from firing the plug when the exhaust valve is being held open. That would mean it is firing even during the intake stroke. What am I missing??
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Old 08-30-2005, 10:31:57 PM
Kevin A. Behnke Kevin A. Behnke is offline
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Default Re: IHC Tom Thumb

It looks complete to me. You ground the battery to the spark saver on the exhaust push rod. Kevin
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Old 08-30-2005, 10:34:43 PM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: IHC Tom Thumb

The connection on the pushrod is a battery saver. It interupts the ignition circut when the engine latches off and coasts. Power dhould go to the insulated block, across some kind of wipe spark contact, or igniter, a second wire goes to the battery saver connection, thru the coil, and back to the battery. You should have a switch in the circut to manually kill the ignition.
Andrew
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Old 08-31-2005, 12:51:01 AM
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Paul Spence Paul Spence is offline
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Default Re: IHC Tom Thumb

"This setup would only keep the buzz coil from firing the plug when the exhaust valve is being held open. That would mean it is firing even during the intake stroke. What am I missing?"

Alan: With the spark saver on the push rod and the governor latched, the plug will not fire because the spark saver is not completing the electrical circuit needed (not touching the engine fin/frame). That is, if you have it wired correctly. Batt + to + on the coil, Batt - to the insulated side of the timer, wire connection on the insulated side of the spark saver to the - terminal on the coil. When the timer makes contact it makes the engine base/frame -, and with the spark saver touching the engine fin, it makes the spark saver -, and with the wire from the spark saver to the - on the buzz coil completing the electrical circuit, the buzz coil will fire. That is if the buzz coil is hot. Some times you have to play with it a little to get it to work. Make sure you have a clean connection on the spark saver to frame/fin. You might have to bend the spark saver a bit to make the connection when the governor is unlatched, and have a return spring on the push rod to the engine frame someplace if there isn't one to pull the push rod back a bit. Enough to make one a bit at times . At least that's how I do it, and it works for me. Just trying to have some fun, even in NJ
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Old 08-31-2005, 06:08:35 AM
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Default Re: IHC Tom Thumb

Thanks to everyone. I will hook up a coil and see if it runs. I think it will.
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