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02-25-2023, 11:37 AM | #1 |
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Join Date: Jul 2010
Location: Aiken, South Carolina
Posts: 695
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Intake Manifold Extension
I am looking for an "intake manifold extension" to lower a carb that has been adapted to run on a model T. This car belongs to a widow that asked me to help get it running better. Seems it backfires and pops going uphill. I drove it and found this is true, and I attribute it to fuel starvation. You will note in the photo that the gas line takes a couple of sharp turns and then quite a rise before entering the carb. This model T is a gravity feed system, and my conclusion is that the gravity system would work if the carb was lowered by 3-4" or so. Also, this Model T has the gas tank under the driver's seat. You might get enough head pressure if it was a 26-27 with the fuel tank higher in the cowl, I suppose.
So this takes me to my question. Anyone know where I might source pre-fabbed manifold extensions? I know I could get one fabricated but thought if someone is making such a thing already it is worth asking. I also know I could rig up a fuel pump but I don't care to do that. |
02-25-2023, 12:04 PM | #2 |
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Join Date: May 2010
Location: Oregon
Posts: 5,966
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Re: Intake Manifold Extension
Since it has much modification give it a fuel pump. That is what I would do.
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02-25-2023, 01:37 PM | #3 |
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Join Date: May 2012
Location: Chillicothe, Missouri
Posts: 1,176
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Re: Intake Manifold Extension
I also agree about adding a fuel pump. That's a highly modified engine and adding 1 or 2 PSI fuel pressure will probably fix the problem of the engine running lean and back firing.
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"If I asked people what they wanted they would have said faster horses." -Henry Ford "Primitive technology is not a design flaw" 1928 Ford Model A Roadster Pickup 1930 Gordon Smith Air Compressor 1941 Willy's Pickup 1960 Thunderbird-For Sale 1964 Buick Riviera 2x4 425 1965 Pontiac GTO, 455 Super Duty 2004 Dodge Ram SRT-10, V-10 Viper 1977 Charger Jet Boat,460 Ford,Jacuzzi Jet Front Engine Nostalgia Dragster,Supercharged 296 "Fullrace Flathead" Ford Engine Build up on DVD ask |
02-25-2023, 03:03 PM | #4 |
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Join Date: Aug 2010
Location: SF Bay Area
Posts: 194
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Re: Intake Manifold Extension
Take a tire pump and rig up a hose to the gas tank cap, put a gasket under the cap and put a few PSI in the gas tank and see if your problem goes away. That will tell you if you have a fuel supply issue.
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02-25-2023, 04:44 PM | #5 |
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Join Date: Jan 2012
Location: Western North Carolina
Posts: 3,904
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Re: Intake Manifold Extension
For my Model T, I ran a small copper line from the exhaust pipe to the gas tank. The copper line was about 6 feet long and in a loop under the seat. The fuel tank and exhaust pipe can be tapped by punching a hole and then treading it. The tap in the gas tank was at the top. The punch forms a conical hole that is easy to tap and has enough strength. The exhaust is mostly carbon dioxide which is safer than pressurizing the tank with air. The gasoline does not flow back into the exhaust, and if it did there would be no harm. The exhaust added just a few inches of pressure, enough to overcome gravity but not enough to overwhelm the float valve in the carburetor. The exhaust pressure was also greater going up a hill, just when you needed it. You have to add a gasket under the gas cap and epoxy the vent hole. It worked very well for me and others who use the same systems.
You can add an electric fuel pump but you will have to limit the pressure by choosing the right pump or adding a pressure regulator,
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A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past. |
02-25-2023, 04:47 PM | #6 |
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Join Date: Jan 2012
Location: Western North Carolina
Posts: 3,904
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Re: Intake Manifold Extension
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__________________
A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past. |
02-27-2023, 02:36 AM | #7 |
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Join Date: May 2010
Location: Portland OR
Posts: 6,342
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Re: Intake Manifold Extension
I would suggest going to the Model T Ford Club of America's site https://www.mtfca.com/phpBB3/index.p...368716a3102and post there or ask on the Facebook speedsters page. https://www.facebook.com/groups/modeltspeedster/
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02-27-2023, 09:34 AM | #8 |
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Join Date: May 2010
Posts: 192
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Re: Intake Manifold Extension
Years ago I ran a Rajo 4 valve and made an extension to lower the carb. About 6" long I was able to use gravity to supply fuel. The problem with lowering the carb is you no longer have warm intake air. Mine ran well for a short time and then the inside would frost up and close off the A/F supply. I removed that intake and went to dual carbs, 6 volt fuel pump and a regulator.
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