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coil overheating on military snow trac

J

John Lumley

New member
My coil overheats and breaks down on my ex military 24v snow trac, as it is 24v I cant find a replacement coil, but I am just wondering if the custom exhaust system I made could be causing this problem, I have 2 silencers running vertically and coming out of the bonnet, could the extra heat from these be causing the problem? I dont have an underbonnet photo to show you all the exhaust but here is an exteriour pic to give you an idea. Thanks
 

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we have 24 volt coils they are the water proof Bosch type new old stock
like on the Hagglunds
 
heat is your enemy on a snow trac but i don't think that is your problem get one ob boggies coils and replace it if you hve an internal resistor in the coil good if the new coil has no internal resistor you will have to add one extreraly to drop ypoy ignition voltage ot your going to eat up your points.
 
John, I have my exhaust exiting out the front of my Snow Trac and do not have any problems with overheating. I doubt if your vertical stacks are causing the problem. JMO
 
John, one thing, if you forget and leave your ignition on it can burn out a coil
also if you have a bad cap, rotor, wires, they can put a strain on the coil also.

one more item worth mentioning on the waterproof coils where the coil wire pushes down in the center there are two copper/brass ears that it pushes down into and on a Hagglunds last year it would start and run then it wouldn't then it would then wouldn't it turned out that one of those ears inside the coil was grounding out bent it in toward the center then it was fine.


Here is a link to a 24 volt coil these are going to be cheaper than the Hagglunds coils all Hagglungs parts are expensive.


http://www.kaiserwillys.com/product/1235/willys_ignitioncoils

Check Ebay also the have them
 
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Thanks for that, Today when it stopped I removed the main coil lead from the distributor and it was still sparking fine so I have renewed all the ht leads and I am waiting to see if my local auto electrician can get me a new distributor cap, rotor arm and condenser as they are looking a little worn and I'm not sure but the condenser may be faulty as the points were looking a bit burned out and a faulty condenser could be causing this.
 
Hi John, I suspect that since you use the term "bonnet" that you are located in the UK. As such, you may have greater access to 24v ignition components for the VW than we on the other side of the pond. I was told that locating a 24v replacement distributor for a VW type 1 engine was essentially impossible in North America. Coils are obviously readily available, as may be cap, rotor, points, and condenser.

I own a former military 24v snow trac as well, that I've since converted to 12v. Before the conversion, I wired in a drop-down resistor in the hot wire supplying the coil, so that it was seeing ~ 13 v at the business end. This way I was able to use all 12v ignition components, but keep the rest of the electrics at 24v. It worked fine. The resistor does get toasty so I mounted it to the fan shroud away from anything that could melt, etc.

As for the exhaust system you show, I would say it's not ideal for controlling heat in the engine compartment. For the car, VW engineers routed the exhaust out of the compartment, and sealed the compartment with tins and a rubber gasket. The stock snow trac configuration is a compromise on that design to begin with, and further modifications like routing the exhaust up through the engine compartment are a greater compromise yet. But how hot is too hot? Consider that your coil temp is largely a product of the heat it generates added to the ambient temp of the surrounding air in the engine compartment.

Cheers - Paul
 
dds said:
he is claiming the coil is still sparking perhaps its vavor lock
Click to expand...

That could be, and the vapor lock can be a system of an overheated engine compartment. If you have one of those clear inline fuel filters before the carb, check to see if there's fuel in there, and see if it's bubbling.
 
mtmogs said:
That could be, and the vapor lock can be a system of an overheated engine compartment. If you have one of those clear inline fuel filters before the carb, check to see if there's fuel in there, and see if it's bubbling.
Click to expand...

Yes it has one of the clear filters fitted and the fuel is not bubbling so I think thats ok.
 
i don't know about the military spec snow trac's but i would suspect it has noise suppression spark plug wires on it, many of the older ones like mine are the old copper core wires that will last forever but raise cane with any radio gear. If you have noise suppression wires ie carbon core than the conductor will start to break down in the wires after time, a recomended change interval is 3to 4 years as they break down they will unable to deliver full voltage to the spark plug. You can see this on an ignition occilliascope this condition can be amplified by heat ,also look closely at your coil in the dark make certin there is no arcing out of a hair line crack in the high voltage tower.
 
I think the coil is shorting out internally, have seen this before runs good cold as the coil heats up it shorts out, may give some spark but weak spark if along with bad wires rotor, or cap ??????
 
boggie said:
I think the coil is shorting out internally, have seen this before runs good cold as the coil heats up it shorts out, may give some spark but weak spark if along with bad wires rotor, or cap ??????
Click to expand...
I'd put my money on that and also a good tune up new plugs points and condenser remember it takes more voltage to spark in the combustion chamber than in the open air
 
I have fitted new ht leads and plugs and I am waiting for a new condenser and points coming so hopefully this will sort it, if not I might have to order one of those 24v replacement coils from america as I cant find any sellers in the uk.
 
John Lumley said:
I have fitted new ht leads and plugs and I am waiting for a new condenser and points coming so hopefully this will sort it, if not I might have to order one of those 24v replacement coils from america as I cant find any sellers in the uk.
Click to expand...

you could check with these guys we have bought from them before in the UK

http://www.thexmod.com/


here is one in UK


http://www.gill.co.uk/products/digital_ignition/inductive_ignition.htm

UK Ebay


http://cgi.ebay.com/ebaymotors/JEEP...ptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories
 
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