Cool carb technologies, heat shield
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Fleet Owner
Joined: Dec 2000
Posts: 25,394
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From: Central PA
Cool carb technologies, heat shield
At Carlisle last week I stopped at a booth that was selling insulated carb heat shields. It is made of a poly-core center sandwiched between two aluminum layers. They are designed to keep your gas in your carb cooler and help prevent vapor lock and prevent evaporation of fuel from engine heat after you shut it down. Here's his website: - Home They cost $20 each and look good.
I was about ready to buy one for one of my trucks with the Holley 94, but I hedged and decided not to. Last weekend I looked at his website. On the order page is a warning that says, "This product is not recommended for use on engines with intakes with heat crossovers." Which is what the Yblock has. It says the poly-core center is an excellent insulator but may become soft or melt from the hot exhaust gases.
I know the exhaust should go through the crossover pipe once the engine is up to temp and the heat riser opens. He said he doesn't want me to have a melted heat shield. He has little experience with yblocks as he is into late model engines. The do work well for flatheads. He wanted to sell me one but recommended I not put one one.
What do our experts here think? How much heat does the intake crossover put out?
I was about ready to buy one for one of my trucks with the Holley 94, but I hedged and decided not to. Last weekend I looked at his website. On the order page is a warning that says, "This product is not recommended for use on engines with intakes with heat crossovers." Which is what the Yblock has. It says the poly-core center is an excellent insulator but may become soft or melt from the hot exhaust gases.
I know the exhaust should go through the crossover pipe once the engine is up to temp and the heat riser opens. He said he doesn't want me to have a melted heat shield. He has little experience with yblocks as he is into late model engines. The do work well for flatheads. He wanted to sell me one but recommended I not put one one.
What do our experts here think? How much heat does the intake crossover put out?
Logistics Pro
Joined: Nov 2006
Posts: 3,676
Likes: 369
From: Fallon,NV & Bainbridge OH
Abe,
This is not accurate "I know the exhaust should go through the crossover pipe once the engine is up to temp and the heat riser opens." The exhaust gas will always flow through the crossover slightly but it will have the most flow when the heat riser is closed (engine cold) which forces more gas back through the intake. This heats the intake faster for better fuel atomization. Performance gasket sets used to (they still might) come with two little pieces of sheet metal to block the heat riser passages. You could do this on your Y block if you are having a fuel percolation issue and want to run this guys heat shied. Another great hot rod trick is to alternate gaskets with aluminum sheets with the gasket holes cut in them. The aluminum sheet should be larger than the shadow of the carb to keep heat from rising into the carb. It only really needs one or two pieces of aluminum depending on how bad your heat soak issue is.
This is not accurate "I know the exhaust should go through the crossover pipe once the engine is up to temp and the heat riser opens." The exhaust gas will always flow through the crossover slightly but it will have the most flow when the heat riser is closed (engine cold) which forces more gas back through the intake. This heats the intake faster for better fuel atomization. Performance gasket sets used to (they still might) come with two little pieces of sheet metal to block the heat riser passages. You could do this on your Y block if you are having a fuel percolation issue and want to run this guys heat shied. Another great hot rod trick is to alternate gaskets with aluminum sheets with the gasket holes cut in them. The aluminum sheet should be larger than the shadow of the carb to keep heat from rising into the carb. It only really needs one or two pieces of aluminum depending on how bad your heat soak issue is.
Lead Driver
Joined: Aug 2006
Posts: 8,094
Likes: 654
From: Brentwood, TN
Abe I think you did well to "hedge"....
A phenolic block under the carb will isolate the conducted heat from the engine, radiated heat is another story and one that even the CoolCarb plate will not resolve.
A phenolic block under the carb will isolate the conducted heat from the engine, radiated heat is another story and one that even the CoolCarb plate will not resolve.
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