steam vent kit
01-10-2007, 08:59 PM
#34
Three Wheelin'
Originally Posted by RolexNJ
Email them and ask. And tell them your suggestions too, can't hurt right?
01-10-2007, 09:03 PM
#35
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Originally Posted by Porschefile
Hehe, I think I'd mainly like to use AN fittings and expensive hose just to add more cool, shiny, expensive parts to the motor!
05-11-2010, 03:49 PM
#36
Burning Brakes
Join Date: May 2004
Location: Minneapolis, MN
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Question for all: I am building my own "kit" and am interested in what kind of line is used. Is it a Teflon based line? Does anyone know the Inner Diameter? Also I need to figure out what the Inner diameter of the return coolant line(where the T fitting goes into) is. Thanks in advance for your measuring skills!
Cheers,
Cheers,
05-11-2010, 04:36 PM
#37
Racer
Join Date: May 2008
Location: Encinitas, ca PCA National DE instructor PCA San Diego chief driving instructor
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It doesn't matter how carefully/completely you bleed your cooling system, with running it will "un-bleed" itself.
How?
Through the water pump shaft seal of course. Water pump seals are designed to seal against internal pressure, but as the pump is a centrifugal type there is actually a slight vacuum in the center of the impeller at high rpm and a small amount of air leaks in. This air stays in solution as long as the coolant is hot, but as soon as it cools off the air comes out of solution and forms bubbles. Guess where they rise to? It isn't an issue on most engines, but ours have a design flaw that traps air around the #4 combustion chamber.
Dave Lindsey's steam vent idea constantly bleeds this air (along with a minor flow of coolant) from around the #4 combustion chamber helping to prevent the most common gasket failure - failure of the fire ring as the engine is cooling down after hard running - caused by the chamber overheating and expanding due to the trapped air and squishing the gasket.
I'm running 18 psi on my track car with no gasket issues since I installed the kit.
Yes the tubing is "just" plastic, but which one? There are thousands of different resins to choose from.
What you're paying for when you buy the kit is the time Dave Lindsey put into figuring out and testing which material is the right choice for the intended service.
How?
Through the water pump shaft seal of course. Water pump seals are designed to seal against internal pressure, but as the pump is a centrifugal type there is actually a slight vacuum in the center of the impeller at high rpm and a small amount of air leaks in. This air stays in solution as long as the coolant is hot, but as soon as it cools off the air comes out of solution and forms bubbles. Guess where they rise to? It isn't an issue on most engines, but ours have a design flaw that traps air around the #4 combustion chamber.
Dave Lindsey's steam vent idea constantly bleeds this air (along with a minor flow of coolant) from around the #4 combustion chamber helping to prevent the most common gasket failure - failure of the fire ring as the engine is cooling down after hard running - caused by the chamber overheating and expanding due to the trapped air and squishing the gasket.
I'm running 18 psi on my track car with no gasket issues since I installed the kit.
Yes the tubing is "just" plastic, but which one? There are thousands of different resins to choose from.
What you're paying for when you buy the kit is the time Dave Lindsey put into figuring out and testing which material is the right choice for the intended service.
05-11-2010, 05:58 PM
#39
Nordschleife Master
Question for all: I am building my own "kit" and am interested in what kind of line is used. Is it a Teflon based line? Does anyone know the Inner Diameter? Also I need to figure out what the Inner diameter of the return coolant line(where the T fitting goes into) is. Thanks in advance for your measuring skills!
Cheers,
Cheers,
McMaster part #'s..
51495K214
5239K232
