| Author |
Message |
    
Frank Petran
Senior Member
Username: frank_petran
Post Number: 83
Registered: 05-2009
| | Posted on Wednesday, February 17, 2010 - 08:47 am: | 
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Have located a water pump and timing gear for my 3hp Gray but still in need of a timer. Any one out there have a spare. This one has the detent serations on a clip or bracked located on the engine right next to where the timer would be located. If someone has one that is a little different I could figue out how to make it work.
This is the final piece that is need to make my engine complete. Thanks. Frank |
Frank Petran
Senior Member
Username: frank_petran
Post Number: 98
Registered: 05-2009
| | Posted on Saturday, April 03, 2010 - 11:28 pm: |
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Still looking for the proper timer for my 3 hp. Gray "U".
In the mean time. I bought that timer that was on Ebay a week or two ago. With a little bit of help and patience I think I can make this unit work. My concern is that the Gray timers used a concentric cam with a brass insert to trigger the coil. The timer I bought has a point setup which means it needs to be opened with a lobe on a cam. I probably can make a cam that will hold the points open until the engine is ready to energize the coil for spark and the let the points close but that doesn’t produce the best results for a good spark. What is the down side of just using a lobe on a cam but that would mean that the coil is energized for almost 90% of the cycle? I don’t know if buzz coils are able to operate that way. Are there any engines that use the point set up? If so what problems can I anticipate?
I would rather have the proper timer so if anyone out there has one that is collecting dust or being dented up and tarnished have pity on a fellow engine guy and offer it up.
I would rather use the Gray for my launch then the Kermath Sea Twin I picked up a couple of weeks ago.
Thanks, Frank |
Willem J. Rupka
Member
Username: bill
Post Number: 14
Registered: 03-2005
| | Posted on Sunday, April 04, 2010 - 08:46 am: |
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Frank
Can't help you out with a timer but have you considered the use of a simple relay to invert the signal from the timer points - energize the buzz coil only when the timer points are open. If you can tell me a little more about how the timer points currently operate (type of cam, are both sides of points insulated or is one side grounded) and type of power you are using (6V or 12V battery, positive or negative ground) I can suggest a relay and wiring plan. Hope this helps.
Bill |
Ernie
Senior Member
Username: ernie
Post Number: 1183
Registered: 01-2002
| | Posted on Sunday, April 04, 2010 - 07:42 pm: |
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Just grind or cut a flat on the rotating piece. The points will/should close for about 20 degrees max.
Hope this helps
Ernie |
Frank Petran
Senior Member
Username: frank_petran
Post Number: 99
Registered: 05-2009
| | Posted on Monday, April 05, 2010 - 12:05 pm: |
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Thanks to all of you for your input. I think I will be using Ernie's suggestion and file a flat on a round cam. I had thought of this before but I wasn't sure of the dwell angle. I have to fabricate a base plate for support and for the detent system, base plate support piece and cam. Thanks again |
