Hot Judson 36er

[Jacks]

Try a little Marvel Mystery oil in the FUEL tank, 4 oz per 10 gal. Helps to stabilize our current fuel. It may be boiling..
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Jack Staggs
Actual name

[vwhelmot]

I had only done ten miles at a very relaxed pace and it wasn't a hot day. I'm starting to think it's electrical again. I removed one of the plugs and got my woman to crank it over to see the size of the spark. As it cranked quicker through the lack of compression , it fired and ran on three cylinders. She stopped it, I refitted the plug and the bloody thing started straight up.
It's a proper confusing problem. Maybe my coil is just randomly breaking down, or a duff plug wire. I will mak up some new ones.

[vwhelmot]

Maybe a dizzy problem? Please help me obi wan , you're my only hope!

[Jacks]

What is the current fuel pressure, cold, checked with a gauge? Does it seem to sometimes start just as you are giving up and releasing the key from the start position?
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Jack Staggs
Actual name

[vwhelmot]

It doesn't seem to start when I release the key no, it just refuses to do anything. With the engine turning over quicker due to the lower compression (plug out) could that be a fuel pressure issue? It actually started on three cylinders and when I replaced the plug it fired and ran normal. When I skimmed the fuel pump (to stop it leaking) I added another gasket to reduce the pressure but to be honest its exactly the same as before. Replacing the Judson coil is my next route. After that a rebuild Glen 010 dizzy would be on the list.


I`m starting to think its cursed and am getting ideas of a 2110cc IDA replacement!!!!

[D-train]

I've been running the Judson coil the whole time and hav alternated between regular points n electronic points. Didn't make much of a difference. Even rebuilt a distributor so I knew the contacts and bits were all good on it too..
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shiny paint doesnt make it worth any more

[vwhelmot]

I`m thinking that the coil maybe breaking down with age. Maybe!!!

[D-train]

I have a couple spares to trial if that's the case with yours, an a couple of see dees too
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shiny paint doesnt make it worth any more

[tinlizard]

[vwhelmot]

New starter fitted inc a new starter bush in the gearbox.
I`ve finally cured it, a combo of bad coil and timing was not 100% right.

[D-train]

U said that last time! Haha..

Bad coil hey, where did u set the timing at now?
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shiny paint doesnt make it worth any more

[vwhelmot]

7.5 , it wasn't near :oops:
Its made a huge difference.

[Jacks]

[vwhelmot]

It was a mixture of a few things to be honest. This year I`ve really tried to solve the problem, rebuilt the fuel pump, carb, Judson charger rebuilt a few years ago.
The coil thing threw me as it was an intermittent fault, it wouldn't fail all the time. I hold my hand up with the timing , not realizing that the notch indicated 7.5 and not tdc. My fault, its timed right now but the vacuum advance touched the fuel line so had to bend the fuel outlet ever so slightly. We live and learn. :oops: It really is running like a swiss watch now, instant starting hot or cold. :D

[fabbe]

do you use a judson coil ?
try with a original bosch coil (I had the same problem as you)

[D-train]

Ok, little update, finally had time to rebuild the pump, been chatting with a mate an we are putting it down to fuel pressure.
Pulled the pump out, dismantled it, swapped the ww diaphragm out for a black made in USA one from another pump, it felt like a stronger material than the ww one, made a new preload jig, changed the bottom out for a straighter one.

So far so good, doesn't have that "rattle" sound when I'm under load up hills which is a bonus. So will trial this for now until it proves it doesn't work then will try another idea.
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shiny paint doesnt make it worth any more

[D-train]

Little update here.
All those years ago when I built the carb up I swapped all the bits from one to another, I didn't have the 140 air jet. I inquired about it to someone and they said it would be fine.

I was at work racking my brain again and it brought me back to the air correction jet. I couldn't remember if I did swap it over so I pulled it apart.
195 air jet as I left it.

So I soldered up a jet and drilled it out until I could find a proper jet, also rebuilt another carb, too much throttle shaft play on the other one and was leaking fuel.

Replaced the carb and air jet, actually found a few 122.5 mains in my collection of 28pcis with 195-180 air jets too.

So far it runs epic, pulls better up hills doesn't get hot, doesn't make any sounds either! Think it's a win now.

And all from not having a small jet. It's amazing the difference now.
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shiny paint doesnt make it worth any more

[steven wardlaw]

Congrats on getting the old Judson to run correct. I had the same problem with my 40HP Judson setup. Best to always check the plug color and go for a little richer mixture than to run it on the lean side.

[Schnage]

I have always trouble to restart my '60 beetle with judsen when the engine is hot after a drive on the autobahn. I stoped the engine an in the same second i can't start again. 2 hours later it will be no problem....
An other problem is when i drive longer withe the same speed, an then i have ro rev up, the engine stucks an dont rev up.....

No idea...

[D-train]

How hot is your Judson body after the drive? Is the fuel evaporating before it gets to the heads?

Mines now broken, so back to stock 36hp for me... Damn.
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shiny paint doesnt make it worth any more