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Old 08-28-2003, 09:51 AM   #1
garface
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Default What's the purpose of the coolant reserve tank/header tank on top of the engine?

Just wondering what its exact function is. Seems like Subaru has been putting them on their turbo cars forever, but not on the N/A cars. Thanks.
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Old 08-28-2003, 10:30 AM   #2
CloNeGTS
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The reserve tank is set higher than the turbo so that coolant continues to trickle through the turbo after the engine has been shut down. Eliminates need for turbo timer.
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Old 08-28-2003, 10:31 AM   #3
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Hot liquids rise. Your turbo is lower than the coolant cap. Hot liquid leaves the turbo in search of higher ground, pulling cooler liquid in behind it.
Basically it helps the turbo live a longer, happier life.

I'm sure someone will pipe in with a long winded, technical answer, but thats the short of it.

-Todd
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Old 08-28-2003, 10:40 AM   #4
CTKAG
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The radiator fill needs to be at the highest point of the engine in order to fully get all air out of the system. Since the turbo is essentially higher than the top of the radiator, it would be possible for air to remain in the system, potentially causing an overheating problem. This is common on vehicles with low, sloping noses (Corvettes for example) where the top of the radiator is lower than the water outlet on the engine.

-Keith-
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Old 08-28-2003, 01:23 PM   #5
samowrx
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Quote:
Originally posted by tcs007
Hot liquids rise. Your turbo is lower than the coolant cap. Hot liquid leaves the turbo in search of higher ground, pulling cooler liquid in behind it.
Basically it helps the turbo live a longer, happier life.

I'm sure someone will pipe in with a long winded, technical answer, but thats the short of it.

-Todd
hot liquids rise? is that even possible? do you mean hot fluids rise?
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Old 08-28-2003, 02:34 PM   #6
ccdelro
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should be hot coolant vapor (not liquid) from the turbo that rises. . . . .
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Old 08-28-2003, 02:47 PM   #7
garface
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Thanks, I actually found some info on this. Here it is:

"The Subaru WRX engines have their water catch tank high on the engine above the turbocharger. It is that little can where you check the water level. When the engine is shut off the water continues to circulate via a physical property of water called a thermal siphon. Simply put, hot water rises up to the catch tank, being drawn from the relatively cool cylinder head water jacket up through the turbo housing. This nifty little idea works every time you turn off your engine."
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