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By dropped 57 - 14 Years Ago
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I'm curious...How is the heat issue handled on john mummerts 4bbl manifold?
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By PF Arcand - 14 Years Ago
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Are you're asking about carb base & choke heat? There isn't any.. Which for northerners like me, would be of some concern. Would likely have to buy and make do with an electric choke setup.
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By Ted - 14 Years Ago
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The lack of a heat crossover in the intake manifold would only be an issue in cold weather startups. A properly operating electric choke would help to overcome that. The line of Edelbrock Air Gap intake manifolds also eliminates the heat crossover capability and these present no issues once the engines are warmed up. In a performance application, the exhaust crossovers are typically blocked off at the intake manifold gasket anyhow so removing the exhaust crossover passage from a performance orientated intake manifold is the next natural evolutionary phase from a performance standpoint. From a manufacturing standpoint, not having to cast in the crossover simplifies the casting process while also potentially allowing more flexibility in the casting of the runners. A good number of aftermarket heads now come without the crossover passage in the head itself which makes the crossover capability in the intake useless if it is there.
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By marvh - 14 Years Ago
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For a choke heat source you could also use the later passenger side Y block exhaust manifold which has a heat stove cast into it. Just run an insulated steel line to your choke thermostat.
marv
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By oldcarmark - 14 Years Ago
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The stove in the exhaust manifold can be purchased as a an aftermarket "kit".They show up on Ebay from time to time.That was also Ford's "service replacement" for the original tube through manifold setup as indicated in my parts catalogue.There was one on my 56 when I purchased the car.Same idea as used on many 60's Ford small blocks.
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By GREENBIRD56 - 14 Years Ago
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I suppose if you really wanted to add it (carb heat) - you could get one of the Ford water heated carb base isolators that has a pair of hose connections. It would just sandwich between the carb and manifold - and with a valve, you could shut it off. They were used in when? sixties / seventies? There must be one in the junk I have in the garage attic.
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By 46yblock - 14 Years Ago
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GREENBIRD56 (7/29/2011)
I suppose if you really wanted to add it (carb heat) - you could get one of the Ford water heated carb base isolators that has a pair of hose connections. It would just sandwich between the carb and manifold - and with a valve, you could shut it off. They were used in when? sixties / seventies? There must be one in the junk I have in the garage attic. If Steve cant find his, there is one in my shop that needs a home.
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By dropped 57 - 14 Years Ago
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I'm in Oregon and it stays cold&wet here most of the time, ha. I'm a sucker for the cool factor of tir power, but, I'm also really in favor of putting my money in john mummerts tip jar, as we say in the hospitaity Biz. So I'm just wondering about about winter, and my daily driver when I open up the cab heater valve, and put the snow tires on
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By DANIEL TINDER - 14 Years Ago
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The fact that my car has a restricted, truck-type intake gasket, and runs just fine in the worst midwestern winter weather (no carb icing, even with an open hood scoop), makes me wonder if the increased volatility of modern gas might actually make manifold heat superfluous in the lower 48?
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By PWH42 - 14 Years Ago
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I have the passage in my heads completely filled and have been running it that way for many thousands of miles in all kinds of weather,from the teens to 100 plus.I've never had any problem at all with no heat to the carb.
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By HT32BSX115 - 14 Years Ago
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DANIEL TINDER (7/30/2011)
The fact that my car has a restricted, truck-type intake gasket, and runs just fine in the worst midwestern winter weather (no carb icing, even with an open hood scoop), makes me wonder if the increased volatility of modern gas might actually make manifold heat superfluous in the lower 48?
It's actually the other way around with todays "modern" gas.......The CARB and EPA have mandated lower vapor pressures for several years nationwide making it harder to vaporize gasoline in carburetors........especially in colder climates....
Regards,
Rick
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By DANIEL TINDER - 14 Years Ago
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[/quote]
It's actually the other way around with todays "modern" gas.......The CARB and EPA have mandated lower vapor pressures for several years nationwide making it harder to vaporize gasoline in carburetors........especially in colder climates....
Surprising. I had assumed closed vapor-recovery & high pressure injection systems now made cheaper/volatile gas formulas more viable. Shouldn't have slept through high school chemistry, I guess. Which has a higher vapor pressure, gasoline or alcohol?
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