Hot Carb

[lah20car@aol.com]

Re: RE: Hot Carb

Hi guys--I just went through the whole gambit of carb heat problems too,
seems to go with the car.
Several things I found---
hole in manifold feeding J tube plugged,
ignition timing off, leading to excessive heat,
small ball under the little j tube in crab not there,
and that is where the fuel comes out at, you can see it, if you get it hot
then take top of carb off and wait a few minutes.
Along with all this I made a phenolic spacer 1/2 inch thick rather than the
standard 1/4 spacer. Also had the manifold coated with Jet Hot finish that
seems to keep it slightly cooler, sure looks nice.
Then built a stainless heat shield that has two layers with the stuff you
would wrap exhaust pipes with between the sheetmetal.
Now all is well and I can stop for gas and not have to spend two hours to get
the car started!!
Also put in a four in one engine gauge where the clock was and now know what
the engine temps are:
running hard at 65 mph the oil temp is 200 f and water temp is 160.
Normal town driving or at 55 mph the oil temp is 180 and water temp is 140,
oil pressure is 45 to 50 at high speed and about 30 at idle,
all this is with no water thermostat, no heater and no oil cooler, I took
that out after finding it completely plugged up.
Anyone wanting to see pictures, email me off list--Adios Ken


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[vaircrazy]

Has anyone had a problem with a carb dripping fuel down the carb
after shutting the engine off? Maybe float set to high or just from
heat rising on carb from exhaust manifold. I thought about making a
heat plate to keep heat from rising on carb. Anyone have any ideas?
Mike Bayman
P.S It only gurgles when It gets shut off!!

 

[WB6WSN]

----- Original Message -----
From: vaircrazy
To: amphicar-lovers@yahoogroups.com
Sent: Friday, May 07, 2004 3:54 AM
Subject: [amphicar-lovers] Hot Carb


Has anyone had a problem with a carb dripping fuel down the carb
after shutting the engine off? Maybe float set to high or just from
heat rising on carb from exhaust manifold. I thought about making a
heat plate to keep heat from rising on carb. Anyone have any ideas?
Mike Bayman
P.S It only gurgles when It gets shut off!!



Mike:

Haven't you noticed the "tube to nowhere" yet? It comes out of the intake
manifold, just below the carb, and runs down into the bilge. That's Triumph's
solution to carbs that get so hot that they boil the gas out of the float bowl;
just let it drip on the street!

Amphis have a little problem with that solution, so the Germans put a bend in
the pipe, and ran it up for a few inches. I suppose the hope was that the
drippings wouldn't fill the U-bend and then overflow. (Gasoline dripped into the
bilge is not a good idea.)

There has been much talk about carb overheating. Shields have been designed, and
the carb should be mounted on a thick spacer to minimize heating from the
manifold. (One bad design point is that, on the 1147cc engines, the intake and
exhaust manifold is one piece, guaranteeing that the intake area gets just as
hot as the exhaust area.) Do a search of the post archives for carburetors and
drip tube and overheating, and you will find a wealth of ideas. The club web
site also has photos of heat shields.

Ed
El Cajon
67 Rust Guppy


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[vaircrazy]

Ed,
Thanks for the info on the carb, I know about the drip tube but
never noticed if it was dripping fuel. I will get buzy researching
the heat plate idea. Thanks again.
Mike