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Antique Gas Engine Discussion

Headless Witte spring questions


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  #1  
Old 07-05-2010, 02:22 PM
Chris Steffen Chris Steffen is offline
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Default Headless Witte spring questions

I have a 6hp headless Witte which I recently got running, also posted a video here. Several questions about the springs. My engine does not seem to coast and then fire, it more or less fires several times then somewhat coasts. Do I put different springs on the flywheel weights or do I adjust the spring on the lockout mechanism (thumb screw). Are there supposed to be 2 springs on the flywheel weights? Some people only run one? Finally does anybody know a good size and tension springs to run? Thanks for the help.
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Old 07-05-2010, 03:07 PM
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Bill Decker Bill Decker is offline
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Default Re: Headless Witte spring questions

Try taking off one of the springs on the flywheel weights and see how it runs then. I only have one on mine. If it still doesn't run right play with the thumb screw.

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Old 07-06-2010, 12:01 PM
Gilbert_Bates Gilbert_Bates is offline
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Default Re: Headless Witte spring questions

Is your latch-out working correctly? Watch your video in your earlier post and look at the exhaust rocker arm, it looks like it is not latching out and opens on every exhaust stroke in a throttle governing sort of way. Now look at Bill's video above and note how the rocker arm latches out in a hit n' miss sort of way.
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Old 07-06-2010, 11:24 PM
Chris Steffen Chris Steffen is offline
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Default Re: Headless Witte spring questions

Thanks for the tips, I have it figured out for the most part. I took one spring off and loosened the thumb nut. This kept it from firing on every stroke. I would still like it to wind down a little more before it fires, fine tuning will take care of that. It is also making some groaning noises that I have not heard before, I can't pinpoint where it is coming from. If it worked perfect I would be bored or on to the next project. Thanks.
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Old 07-07-2010, 12:12 AM
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Ron Haskell Ron Haskell is offline
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Default Re: Headless Witte spring questions

On the headless Witte if there is any slop side to side measured at the pick you will have trouble getting it to hit consistently. I had to bush mine and make a new pin.
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Old 07-07-2010, 05:08 AM
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Bill Decker Bill Decker is offline
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Default Re: Headless Witte spring questions

You can try putting a weaker spring on the weights.
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Old 07-07-2010, 10:51 AM
Gilbert_Bates Gilbert_Bates is offline
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Default Re: Headless Witte spring questions

The groaning noise is the meshing of the cam and crank gear. It groans when opening the exhaust valve from the exhaust valve spring pressure applied to the cam lobe. Then there will be a clank as soon as the top of the cam lobe is reached, when pressure is applied then to the backside of the cam lobe. The clank is the slop (backlash) in the cam/crank gear. Take the plug out and spin it by hand and you'll see/hear what I mean. My 4hp does this.
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Old 07-07-2010, 03:51 PM
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Default Re: Headless Witte spring questions

My post should have said, side to side slop in the rocker arm at the pick. My fingers type faster than my brain thinks some times.
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