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Message |
    
Barry Millar
Senior Member
Username: barry
Post Number: 66
Registered: 02-2006
| | Posted on Tuesday, April 29, 2008 - 05:26 pm: | 
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Attached is an image of a D23 spark plug removed from a two cycle engine after several hours of operation. I’m very interested in receiving opinions regarding the condition of this plug and how the plug’s condition might provide information regarding the engine’s condition.
Barry
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Roger DiRuscio
Senior Member
Username: solarrog
Post Number: 293
Registered: 03-2002
| | Posted on Tuesday, April 29, 2008 - 05:36 pm: |
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looks good to me
Rog |
Ernie
Senior Member
Username: ernie
Post Number: 809
Registered: 01-2002
| | Posted on Tuesday, April 29, 2008 - 07:12 pm: |
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Looks good to me in fact text book good
What oil mix ratio are you using
Your are pretty brave using a Champion aren't you? I have no luck with new Champions. I use nothing but Autolite or Motocraft. I don't seem to be able to kill them.
When I get my boat uncovered I will look at the plug from my Gray. It ran all last summer on 16 to 1 oil mix. Never looked at is as it ran soo good. Now I am curious. |
Barry Millar
Senior Member
Username: barry
Post Number: 67
Registered: 02-2006
| | Posted on Wednesday, April 30, 2008 - 10:58 am: |
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Ernie,
I am very interested to learn of your experience when you are able to remove and inspect the plug from your Gray engine, the oil you are using, usual ignition setting, usual carb setting, spark plug make and number, etc… perhaps a close up image of the plug.
I have run extensive tests using my test bench with respect to spark plug options, cold/hot, oil type/ratio, carb settings rich/ lean, ignition timing, ignition style regular/solid state etc…… all of this to better understand antique two cycle engine combustion technology and to offer this information to other members who may be experiencing starting and operating problems.
I am encouraged because of the condition of the plug illustrated in my previous post. I agree that this is ideal so it follows that by better understanding the conditions that produce this result, optimum engine performance can be achieved, and by reading spark plug condition engine performance can be monitored.
Of course there is much information available relative to modern engines and while the principles are the same their application may require clarification when applied to old two cycle machines.
I’m using a two cycle oil formulated for high speed air cooled engines, (rather than water cooled outboard engines) in ratio 32/1. The champion plug is the hottest plug that I can find that matches the 18mm thread. I’ll explain my reason for these choices in subsequent posts if there is interest. I also have engines that use the more common ½” pipe thread plugs and will be operating one of these engines ( when weather warms up) to verify results.
Barry |
Ernie
Senior Member
Username: ernie
Post Number: 1076
Registered: 01-2002
| | Posted on Wednesday, October 14, 2009 - 08:54 pm: |
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Barry,
To finally get back to you on the condition of the plug in my Gray Model U
The plug is a Motorcraft for a Model T Ford. Not sure of the number.
It ran good all this summer too. I finally pulled it out to look at it. Looks like crap. Oil mix still 16 to 1 with 30w non detergent. Gap is .020 or greater I think it was .020 when I put it in. The more I run my boat the greater my respect for these old time engineers that made something that simply put "just ran good" under just about any conditions.
By the way I still don't have a drip pan under my Schlebler as it doesn't leak. The only time the engine doesn't start good is when I forget to open the throttle as seen in the vid from Mystic this year. |
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