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Antique Gas Engine Discussion

FM - Headless


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  #1  
Old 05-17-2005, 01:19:43 AM
ErikG ErikG is offline
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Default FM - Headless

I'm looking for a picture of the igniter spring setup for a FMZ- Headless. S.N. 175127 which I believe dates it to 1916. I understand there are 2 variations of the springs, the earlyer ones having 1 spring and the later having 2. Mine had one torsion spring I believe is original and a cobbled spring off the end of the shaft.

Thanks in advance,
Erik Grund
Bloomington, MN
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Old 05-17-2005, 10:26:51 AM
KidDynamo KidDynamo is offline
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Default Re: FM - Headless

My 1917 headless has a similar ignitor and I believe there is just one spring. This is the "early" style ignitor. What I'm not seeing in your photo is the ground wire that connects the movable electrode to the ignitor body. The later style headless ignitor design doesn't use this grounding wire and this was probably a good design change.

This grounding wire connects to the threaded hole in the end of the movable electrode shaft and and the threaded hole in the ignitor body adjacent to the movable electrode. The wire is simply a short "u" shape fastened with a couple of round head slotted head machine screws.

Perhpas the "second spring on the end of the shaft" that you refer to was performing the function of this grounding wire. I can attest that my headless won't run if this wire is broken, even if it doesn't look broken and I don't see the break. !!

Sorry- no photos.
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Old 05-17-2005, 02:33:08 PM
Dick Welty Dick Welty is offline
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Default Re: FM - Headless

Thanks Eric for posting the pictures.

The Igniter base for one of my Headless engines has been cut off and drilled and tapped for a spark plug and the other has a crude sparkplug plate over the igniter hole.

Your pictures help me get an Idea what my pattern will have to look like to cast some original looking igniters.

Several friends of mine want me to have some cast for them also. If others on the Stak also want some please e-mail me at daw4224@yahoo.com.

I am still looking for an original to buy or borrow as an example to make the pattern.

If the igniters are materially different between the new style and the early style I might make both available.

Anyway thanks again,

Dick
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Old 05-17-2005, 05:31:29 PM
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Steve Kreiner Steve Kreiner is offline
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Default Re: FM - Headless

Erik I have a headless and it has two springs the one on the end of the igniter shaft acts like it holds the movable part so it gets a good ground just like an intake valve spring keeps it tight.
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Old 05-17-2005, 11:40:38 PM
Dick Welty Dick Welty is offline
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Default Re: FM - Headless

Steve,

Other than the extra spring does your igniter look like Erik's igniter or is it different.

Dick
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Old 05-18-2005, 12:05:01 AM
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Junkologist Junkologist is offline
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Default Re: FM - Headless

Dick,
I also have the two spring ignitor on my engine and it's a whole different animal from the early type. They look very similiar, but none of the parts will interchange, as well as I'm aware of. There is also no adjustment on the later two spring ignitor like there is on the early one. If you'd like photo of my ignitor, let me know.

Mike
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Old 05-18-2005, 10:07:20 AM
Dick Welty Dick Welty is offline
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Default Re: FM - Headless

Mike,

I would greatly appreciate some pictures of your igniter.

Is the main casting the same and just the trip parts different or is it totally different?

I am making it my goal to reproduce this igniter for myself and any others who have these engines without igniters. It seems that there are quite a few others who are in the same boat as I am in this regard.

Thanks Mike,

Dick
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Old 05-18-2005, 09:45:12 PM
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Default Re: FM - Headless

Dick,
I took some photos of my ignitor today and then left the camera in my barn. Tomorrow after I get home from work I'll send them to you.

Mike
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Old 05-19-2005, 05:29:47 PM
Dick Welty Dick Welty is offline
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Default Re: FM - Headless

Thanks Mike,

I will look forward to them.

Dick
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Old 05-19-2005, 10:22:05 PM
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Default Re: FM - Headless

Dick,
Here's a photo of my ignitor. If you would like more photos, just send me an email and I will reply with them. I can't seem to put photos in the SmokStak email message to you, but I can reply to you with them.

Mike
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