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Antique Gas Engine Discussion

Fairbanks-Morse 6 HP Z


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  #1  
Old 06-20-2012, 06:52:54 PM
J.Bubba Lee J.Bubba Lee is offline
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Default Fairbanks-Morse 6 HP Z

Where should the ignition timing be set? I can get my engine to fire, about 5-7 degrees after TDC, but it does not have enough power to complete the next compression stroke. Butter fly is wide open, getting plenty of gas, check valve is OK. If I set the timing just a little before 90 degrees after TDC, it will run real slow about 3 rev's and then quit, butterfly wide open. Exaust valve is timed with crank. Help appreciated.

James Lee - TN
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Old 06-20-2012, 07:32:06 PM
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David M. Lyon David M. Lyon is offline
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Default Re: Fairbanks-Morse 6 HP Z

If your Magneto has an impulse, (and it is in working order!) set it to trip the impulse just at top dead center. It will automaticaly advance the timing once the engine starts.
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Old 06-20-2012, 07:35:01 PM
Bill Hazzard Bill Hazzard is offline
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Default Re: Fairbanks-Morse 6 HP Z

Timing should be at least 0 to 10 degrees before top dead center for running slow. If running under load at rated speed timing should be about 20 to 30 degrees BTC.
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Old 06-20-2012, 07:42:42 PM
Jeff Miley Jeff Miley is offline
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Default Re: Fairbanks-Morse 6 HP Z

I know you said it is getting plenty of gas but have you checked the checkball in the fuel line? If this is not working well the engine will fire on priming fuel but not draw any additional fuel in to run. Just a thought.
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Old 06-20-2012, 10:38:53 PM
Martin Gaudet Martin Gaudet is offline
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Default Re: Fairbanks-Morse 6 HP Z

Are the valves working OK?
If the intake is leaking or if the spring is not set right, it will do funny things.
Just a thought...
Martin
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Old 06-21-2012, 11:15:30 AM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: Fairbanks-Morse 6 HP Z

Initial timing should be no later than TDC, otherwise you won't develop enough power to carry over, as you already see.
Andrew
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Old 06-21-2012, 01:21:57 PM
BobRR BobRR is offline
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Default Re: Fairbanks-Morse 6 HP Z

What yr. engine? Spark plug or ignitor? Bob
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Old 06-21-2012, 03:20:27 PM
J.Bubba Lee J.Bubba Lee is offline
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Default Re: Fairbanks-Morse 6 HP Z

Check valve is OK, I am using a coil and set of points, good fire at plug. I have pulled it through real slow and when it fires I can hear the explosion, but I can hold the fly wheel to keep it from turning. I have done this while looking at the head, I see no blow by through the valves.

James Lee - TN

---------- Post added at 02:20 PM ---------- Previous post was at 02:16 PM ----------

P.S. I can see just a little smoke come past the rings, thought this was normal on cold engine, will advance the timing and see what happens.Thanks everybody.

James Lee - TN
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Old 06-21-2012, 03:43:24 PM
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David M. Lyon David M. Lyon is offline
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Default Re: Fairbanks-Morse 6 HP Z

Since you don't have an impulse, set the points to fire the coil at 8 to10 degrees BEFORE top dead center, Hold the intake valve open with your left hand to relieve compression, spin the engine over with your right hand until you get it spinning as fast as you can, and then release the intake valve and simultaneously remove the crank handle. The flywheels will carry it through the next cycle and it should take off on the next go 'round. ...Don't try it without holding open the intake, or it'll kick back. That big six horse Fairbanks Morse is strong and it will hurt you!
As always. Be careful with that crank handle!!! don't let it slap you in the jaw!
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Old 06-22-2012, 11:07:01 AM
J.Bubba Lee J.Bubba Lee is offline
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Default Re: Fairbanks-Morse 6 HP Z

I don't have a crank handle, read here that you could get in a fight with one of them and they would win, knocked out teeth, broken bones, etc, how ever, I will see if I can find one. I have just been grabbing the spokes of the wheel and spinning it that way.

It is a 1921 model. Thanks again. Any ideals on where to look for handle?

James Lee - TN
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