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01-17-2018, 01:44 AM | #1 |
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Vapor Lock Thick Carb/Manifold Gasket?
Does anyone make a thicker gasket for a stock '33 single barrel Carburetor that dissipates heat? Just trying to avoid pesky "VLS" (-Vapor Lock Syndrome) in preparation for mucho driving this summer. If not, can someone suggest material I can fabricate from?
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01-17-2018, 05:36 AM | #2 |
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Re: Vapor Lock Thick Carb/Manifold Gasket?
I did mine out of POM- plastic(polyacetat), it worked out great.
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01-17-2018, 07:01 AM | #3 |
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Re: Vapor Lock Thick Carb/Manifold Gasket?
I've seen these for sale at the Syracuse car show. Probably a little pricey.
http://www.coolcarb.com/index.html May not have one for your carb. Making one shouldn't be too hard. |
01-17-2018, 04:06 PM | #4 |
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Re: Vapor Lock Thick Carb/Manifold Gasket?
See the following site for one to suit your carburetor.
https://www.dashman.net/product.html?id=215 --
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01-17-2018, 04:46 PM | #5 |
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Re: Vapor Lock Thick Carb/Manifold Gasket?
Often the "vapor lock" is actually caused by the ignition coil getting hot. It is safe to say that all original unrebuilt coils cause problems. The insulation breaks down and allows shorts between the windings, reducing ignition output. Contact Skip Haney 941/505-9085. Excellent work and price.
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01-17-2018, 05:13 PM | #6 |
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Re: Vapor Lock Thick Carb/Manifold Gasket?
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01-17-2018, 06:10 PM | #7 |
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Re: Vapor Lock Thick Carb/Manifold Gasket?
Vapor lock is actually a condition in the fuel line and/or fuel pump. Putting a spacer under the carb will not prevent vapor lock, but can't hurt as far as boiling/evaporating fuel in the carb after the engine has been shut off hot.
To prevent vapor lock you need to make sure fuel lines are away from hot spots like exhaust manifolds, etc. Or wrap the fuel lines. An electric fuel pump eliminates the possibility of vapor lock, but most people don't do that because of originality. Also, if the ignition timing isn't advancing as much as it should, it creates hotter exhaust gas temps, which makes the manifolds hotter and more prone too vapor lock. Sal |
01-17-2018, 06:12 PM | #8 |
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Re: Vapor Lock Thick Carb/Manifold Gasket?
The phenolic spacer on the carb will help minimize the carb fuel bowl boiling down after shutting down on a hot day, but the carburetor is not the primary cause of vapor lock. It is the mechanical fuel pump, which sits closer to the block and is somewhat shielded from cooling air by the carb and firewall. When it gets hot, the fuel vaporizes inside the pump chamber. The diaphragm pump is pretty efficient with incompressible liquid, but doesn't pump compressible gas worth a darn. Thus the pump is "vapor locked" until the body of the pump cools down enough for the vaporized gas to condense back to liquid state. You can not use an insulating gasket on the pump stand, because the added thickness would shorten the pump stroke.
The low boiling point of alcohol in the bas makes the problem worse. So open the hood, throw a wet rag over the fuel pump and copper fuel lines and install an electric fuel pump back by the fuel tank. |
01-17-2018, 06:16 PM | #9 |
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Re: Vapor Lock Thick Carb/Manifold Gasket?
Speedway sells these cheap. I think under $10.
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01-17-2018, 06:17 PM | #10 |
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Re: Vapor Lock Thick Carb/Manifold Gasket?
Drolston,
I think we were both typing at the same time. Sal |
01-17-2018, 06:20 PM | #11 |
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Re: Vapor Lock Thick Carb/Manifold Gasket?
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01-17-2018, 08:18 PM | #12 |
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Re: Vapor Lock Thick Carb/Manifold Gasket?
Bob Shewman makes what I think are the best carb spacers. He makes them
for both carbs. They have passages running though them for better cooling. Longer studs are also provided. [email protected] 1-610-933-6637 G.M.
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01-18-2018, 11:44 AM | #13 |
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Re: Vapor Lock Thick Carb/Manifold Gasket?
I'm stuck with 10% ethanol gas in my neighborhood and a few forum members have mentioned that its more susceptible to vaporizing.
Regardless, my '47 came with a six-blade fan which makes a lot of noise at higher RPM's but the engine ran well. Not liking the fan noise, changed to a four -blade fan (lower air volume) and the engine started quitting unpredictably. After blaming and changing everything else (coil, condenser, pump, etc) I changed back to the six-blade fan and no more problems so far. I guess the prior owner figured it-out and put that six-blade fan on. as drolston suggests above, seems the back of my engine compartment wasn't getting enough ventilation. (the fuel line from the tank was/is insulated) Last edited by Drbrown; 01-18-2018 at 11:55 AM. |
01-18-2018, 01:48 PM | #14 |
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Re: Vapor Lock Thick Carb/Manifold Gasket?
Dan if you have any Stewart's shops near you, their premium is ethanol free, I siphoned all the gas out of my car and put in their hi-test, I have one of their stations around the corner from me. I know it cost more and I don't need the hi-test, but I hope is saves me a bunch of headaches down the road.
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01-18-2018, 02:00 PM | #15 | |
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Re: Vapor Lock Thick Carb/Manifold Gasket?
Quote:
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01-18-2018, 03:40 PM | #16 |
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Re: Vapor Lock Thick Carb/Manifold Gasket?
List of ethanol free gas stations in US. https://www.pure-gas.org/index.jsp?stateprov=NY
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01-18-2018, 10:16 PM | #17 |
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Re: Vapor Lock Thick Carb/Manifold Gasket?
corvette8n: Thanks. Do have Stewart's here in Glens Falls but they don't pump non-eth. There's a Mom-Pop 7/11 deli shop off Northway exit 25 with non-eth premium but very expensive (+40 cents/per gal) and its 35 miles north of me (70 miles and 1-1/2 hour round trip).
Faced with that option, I can put up with a lot of fan noise. TonyNY: Thanks. That web site's map function isn't currently working. Will check back. |
01-19-2018, 07:24 PM | #18 |
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Re: Vapor Lock Thick Carb/Manifold Gasket?
Has anyone noticed if the fuel pumps with the glass sediment bowls are less prone to vapor lock?
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01-19-2018, 07:45 PM | #19 |
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Re: Vapor Lock Thick Carb/Manifold Gasket?
I never thought about it, but I have one and don't have any vapor lock problems. Perhaps the fact that I am in the resort area of north central Minnesota where almost every station carries non-alcohol gas may have something to do with it.
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01-19-2018, 08:42 PM | #20 |
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Re: Vapor Lock Thick Carb/Manifold Gasket?
If you put an insulator under the carb, complete the job by using fiber washers under the nuts on the studs. Heat will still travel up the stud, through the nut and down into the carb base unless you interrupt it with an insulator. You can probably find small drain plug gaskets or plastic electric insulating washers at a hardware store. I buy them from McMcaster-Carr.
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