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What is this - a timer?

Old Marine Engine » One and Two Cylinder Gas Inboards » What is this - a timer? « Previous Next »

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dick_briggs
Advanced Member
Username: dick_briggs

Post Number: 37
Registered: 02-2015
Posted on Wednesday, December 02, 2020 - 03:43 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

From a friend, found in a large lot of mostly Model T stuff. Looks like a timer but still pretty odd ball. Any ideas? Thank you.




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ernie
Senior Member
Username: ernie

Post Number: 2617
Registered: 01-2002


Posted on Wednesday, December 02, 2020 - 07:18 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Would have been on a 2 cylinder 4 stroke odd fire engine.
Would have sounded like a 2 cylinder John Deere tractor
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johnny
Senior Member
Username: johnny

Post Number: 624
Registered: 03-2006


Posted on Wednesday, December 02, 2020 - 10:18 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I think a John Deere two cylinder fires 180 degrees apart. These contacts are firing on 45 degrees would this timer be for a V-twin engine with cylinders on 45 degree's?
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ernie
Senior Member
Username: ernie

Post Number: 2618
Registered: 01-2002


Posted on Thursday, December 03, 2020 - 01:42 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

The timer is going to rotate at 1 half crank speed like the cam. This being the case they are 180 out related to the crank.
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dick_briggs
Advanced Member
Username: dick_briggs

Post Number: 38
Registered: 02-2015
Posted on Friday, December 04, 2020 - 04:47 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Thanks for the thoughts; I'll pass them along, but where might the other lead (from battery or coil) attach?
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ernie
Senior Member
Username: ernie

Post Number: 2619
Registered: 01-2002


Posted on Friday, December 04, 2020 - 02:44 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Timers usually ground the coil so the batt minus lead went to the engine block. The timer was grounded through its mounting on the engine. Battery plus went to the coil batt terminal
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johnny
Senior Member
Username: johnny

Post Number: 626
Registered: 03-2006


Posted on Friday, December 18, 2020 - 01:22 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Ernie, Thank's for the info as I know you have been working on the old marine engines much longer then I have. I know the timer contact locations & the gear ratio have to be worked out so the ignition fires at the proper time. I have owned a few different two cylinder two stroke marine engines and the timers on them have the contacts 180 degree's apart just like the crank throws. Guess that is why I thought this timer might be for a 45 degree two cylinder. Guess it really depends on the gear ratio as to where the timer contacts would be located? Also if it is a four stroke or two stroke?

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