heat wrapping manifold
19 February 2011, 12:34 PM
#5
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its too keep the exhaust temp up which in turn makes gases flow better and reduces engine bay temps.
was told that the cast parts of manifold will retain too much heat and crack?
was told that the cast parts of manifold will retain too much heat and crack?
21 February 2011, 10:14 AM
#6
I have been DEI heat wrapping Subaru cast manifolds/headers for more than 12 years now and in that time I have never come across a failed cast section.
Your engine is basically a heat pump and for maximum efficiency you keep the hot bits hot and the cold bits cold.
Hot bits include turbo exhaust section, headers, uppipe and downpipe.
Cold bits, turbo compressor, inlet manifold and fuel. Anything that helps keep air charge as close to ambient as possible is highly desirable.
If you want to determine the effect of hot/warm turbo and exhaust side you can do a little trial if you have a boost guage. With the car at normal running temperature, on a level section of road, do a run from around 1500 rom in 4th gear and clock the rpm at which you achieve 1 bar. Repeat this as many times as it takes for the spool point to 1 bar to reduce to a stable figure. As the exhaust section heats up the spool point reduces.
Heat is energy and retaining that heat with heatwrapped headers, turbo heat blanket and wrapped downpipe all helps the early spool of the turbo.
Just as with a fluid like oil, hot gases flow better than cold.
Your engine is basically a heat pump and for maximum efficiency you keep the hot bits hot and the cold bits cold.
Hot bits include turbo exhaust section, headers, uppipe and downpipe.
Cold bits, turbo compressor, inlet manifold and fuel. Anything that helps keep air charge as close to ambient as possible is highly desirable.
If you want to determine the effect of hot/warm turbo and exhaust side you can do a little trial if you have a boost guage. With the car at normal running temperature, on a level section of road, do a run from around 1500 rom in 4th gear and clock the rpm at which you achieve 1 bar. Repeat this as many times as it takes for the spool point to 1 bar to reduce to a stable figure. As the exhaust section heats up the spool point reduces.
Heat is energy and retaining that heat with heatwrapped headers, turbo heat blanket and wrapped downpipe all helps the early spool of the turbo.
Just as with a fluid like oil, hot gases flow better than cold.
21 February 2011, 10:24 AM
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I have been DEI heat wrapping Subaru cast manifolds/headers for more than 12 years now and in that time I have never come across a failed cast section.
Your engine is basically a heat pump and for maximum efficiency you keep the hot bits hot and the cold bits cold.
Hot bits include turbo exhaust section, headers, uppipe and downpipe.
Cold bits, turbo compressor, inlet manifold and fuel. Anything that helps keep air charge as close to ambient as possible is highly desirable.
If you want to determine the effect of hot/warm turbo and exhaust side you can do a little trial if you have a boost guage. With the car at normal running temperature, on a level section of road, do a run from around 1500 rom in 4th gear and clock the rpm at which you achieve 1 bar. Repeat this as many times as it takes for the spool point to 1 bar to reduce to a stable figure. As the exhaust section heats up the spool point reduces.
Heat is energy and retaining that heat with heatwrapped headers, turbo heat blanket and wrapped downpipe all helps the early spool of the turbo.
Just as with a fluid like oil, hot gases flow better than cold.
Your engine is basically a heat pump and for maximum efficiency you keep the hot bits hot and the cold bits cold.
Hot bits include turbo exhaust section, headers, uppipe and downpipe.
Cold bits, turbo compressor, inlet manifold and fuel. Anything that helps keep air charge as close to ambient as possible is highly desirable.
If you want to determine the effect of hot/warm turbo and exhaust side you can do a little trial if you have a boost guage. With the car at normal running temperature, on a level section of road, do a run from around 1500 rom in 4th gear and clock the rpm at which you achieve 1 bar. Repeat this as many times as it takes for the spool point to 1 bar to reduce to a stable figure. As the exhaust section heats up the spool point reduces.
Heat is energy and retaining that heat with heatwrapped headers, turbo heat blanket and wrapped downpipe all helps the early spool of the turbo.
Just as with a fluid like oil, hot gases flow better than cold.
Thanks mate that is a great bit of info.
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