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Snowcat Adventure & Usage Forum Snow Trac, Kristi, Thickol/LMC, Tucker, Bombardier stories & discussions

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  #1  
Old 03-06-2018, 05:21 PM
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Default Rattlesnake radio site

Today I ran a radio tech up to one of our repeater sites near North Bend to make a minor repair. We only needed to go about 5 miles but there is 3-4 feet of fresh powder up there. It was quite warm but the weather was stunning. Yesterday I added a small bilge blower in an attempt to keep the carb cool and prevent the vapor locking. It helped but when I left it running to cut a downed tree it still stumbled and stalled twice after we were done cutting. But it was warm out and I had been driving up a steep hill with the throttle wide open for some time.
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  #2  
Old 03-06-2018, 09:23 PM
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Default Re: Rattlesnake radio site

Really great pictures! Was your cat owned by the sheriff's dept. or?
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Old 03-06-2018, 09:30 PM
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Default Re: Rattlesnake radio site

Not was, still is. We use it primarily for search and rescue. Or runs to the mountain top radio sites. Last winter I made four trips for radio repairs.

It came to us via the 1033 program. The Navy had it and surplussed it. We got it for free. It's a 1988 LMC1200. Had about 280 hours on it. About 350 now. It's in pretty nice shape for a 30 year old cat.
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Old 03-06-2018, 09:39 PM
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Default Re: Rattlesnake radio site

If it doesn't have one I'd put a electric fuel pump on
As close to the tank as you can and below it
Sometimes turning the heater on can help
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Old 03-06-2018, 09:54 PM
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Default Re: Rattlesnake radio site

looks like a good day and saved someone a few bucks by running them up.
did you bring the tree home?
jim
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Old 03-06-2018, 10:09 PM
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Default Re: Rattlesnake radio site

Just wondering, is there a chance you are seeing carb icing, not vapor lock? after a hard full throttle event you might have built up ice in the venturi.
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Old 03-06-2018, 10:51 PM
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Default Re: Rattlesnake radio site

Haven't tried the electric pump yet.

I left the tree there. Do you want it?

I have put my hand on the carb and it's hot to the touch. So I'm thinking vapor lock. But I like your theory.
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Old 03-06-2018, 11:41 PM
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Default Re: Rattlesnake radio site

I think a small piece of sheet steel mounted between the carb and manifold as a heat shield would help. My guess is fuel is boiling in the carb, as the radiant heat is heating the base and body of your carb.. Gasoline now days I fell boils at a lower point that the fuel of years ago. Maybe E10 is at fault here? I think it boils at a lower temp, due to the alcohol. Seems like I have seen this heat shield on a Thiokol at some point in the past few years.. Maybe here on the forum, I just don't remember, but I thought it was a factory deal. I have seen this set up on a 300 Ford in an industrial application, an enclosed trailer type air compressor.

I hope you find a cure for this gremlin in your machine.

Regards, Kirk
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Old 03-06-2018, 11:49 PM
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Default Re: Rattlesnake radio site

I have fuel injection on my 1985 lmc 1200 It costs about a grand but no vapor lock and the cold starts are great plus the mileage improvement is nice!!
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Old 03-06-2018, 11:58 PM
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Default Re: Rattlesnake radio site

I have been giving serious thought to a TBI system. What is on your 1200 Bobby?
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Old 03-07-2018, 12:08 AM
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Default Re: Rattlesnake radio site

It is from a company called affordable fuel injection There top of the line kit even has a dodge diesel electronic throttle pedal Mine is regular pedal but the drivability is amazing
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Old 03-07-2018, 12:40 AM
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Default Re: Rattlesnake radio site

I have been looking at their website. Which system did you get? They have a legacy system and also several versions specifically for the 300 industrial. Was the install easy?
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Old 03-07-2018, 12:54 AM
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Default Re: Rattlesnake radio site

Here’s the website!
https://www.affordable-fuel-injection.com

How hard was the install?


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Old 03-07-2018, 11:44 AM
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Default Re: Rattlesnake radio site

Quote:
Originally Posted by PJL View Post
Today I ran a radio tech up to one of our repeater sites near North Bend to make a minor repair. We only needed to go about 5 miles but there is 3-4 feet of fresh powder up there. It was quite warm but the weather was stunning. Yesterday I added a small bilge blower in an attempt to keep the carb cool and prevent the vapor locking. It helped but when I left it running to cut a downed tree it still stumbled and stalled twice after we were done cutting. But it was warm out and I had been driving up a steep hill with the throttle wide open for some time.
Niccce pics
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Old 03-07-2018, 11:50 AM
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Default Re: Rattlesnake radio site

I bought my 1200 from Ed out in colorodo I beleave he goes by mkntracks on here The hardest part would be welding the fitting for the o2 sensor
in the exhaust
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Old 03-07-2018, 10:09 PM
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Default Re: Rattlesnake radio site

"I have put my hand on the carb and it's hot to the touch." Yep, that pretty much eliminates carb icing as the culprit.

I like the heat shield idea. The other thing to look at is the fuel line routing. Make certain the fuel isn't boiling by the time it gets to the carb.
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Old 03-07-2018, 10:51 PM
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Default Re: Rattlesnake radio site

I have some pieces of aluminum to make a heat shield out of. Just haven't had the time.
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Old 03-12-2018, 08:35 PM
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Default Re: Rattlesnake radio site

This is what Bombardier put on my 1989 sv252g Skidozer Ford 300ci Industrial. Thin metal plate between the intake manifold and carb with insulation board attached. They even put it on the passenger side of the engine cowl to help with the heat. I believe this is what 300H&H is referring to. I would look into apiece of cement fiber board (used behind wood stoves) auger the center out enough to insert plate between carb and manifold for mounting. Note: also the fuel filter with the return line to tank that may help also. May also source some material from Mc Master Carr.
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Old 03-12-2018, 10:37 PM
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Default Re: Rattlesnake radio site

Today I brought in some tools from home and crafted a heat shield. I had some 6x12 plates of aluminum to work with. I used a hole saw, drill bits, hack saw and a file. The new base gasket is much thicker too. I had to get longer studs. I think it looks pretty good. Engine runs fine. I am hoping to try it out on Friday. We still have a lot of snow on the 70 road for a trip up to the meadows.
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Old 03-16-2018, 06:36 PM
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Default Re: Rattlesnake radio site

Well.... It didn't work as well as I had hoped. It was better but the heat was too much for my little bilge blower. It passed away about an hour into our trip.

Probably have that AFI system installed this summer.

As you can see the weather was awful.
Beats driving a desk.
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Last edited by PJL; 03-16-2018 at 06:58 PM.
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