Water Cooled Turbo?
- Thread starter martin_nj
- Start date
Raise your hand if you ever atleast once, driven your car for no less than 10 minutes and never got into anybit of boost.(sleep)
bykeryder4life
Member
so during this time(whether long or short) that the coolant is vaporizing whats the oil doing? It's sitting inside a hot turbo. If you shut the car off right away. because the car is not running the oil is not flowing so it has the chance if coking in the turbo, which is why you idle a car after driving it, to prevent this. Pretty nifty huh you ******* douchebag dont assume I am a complete newb because I dont post alot here. Any turbo car you dont shut right down after driving unless you drive like a b****. Anyone who listens to you and shuts their car down after a drive is going to ruin their turbo, possibly even warp parts of it that did not cool properly.
bykeryder4life
Member
yeah thats cool to do and that is what I do many times, just drive mellow then you dont need much more than 10-15 sec idle down time.
These are terrible pix. I'll try to get some more. But even at this low rez, the water lines are visible going into and out of the turbo housing.
And yes, this is a Hitachi-Warner K04.
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speed3se-r
Member
i agree with you. The coolant may cool the turbo too, BUT it's the oil that we are worried about. What happens to the oil between the bearings? Remember that it's probably searing hot inbetween there. If you immediately shut off the engine all the time, it will eventually begin to coke and block the oil passages. SOOoo...why not be safe than sorry?
You can run your car at redline for 2 hours and immediately shut it off. As far as the turbo is concerned, it will be fine. That being said, it is a good idea to run your car nicely for a few minutes so ALL the fluids in your car can return to their normal operating temperatures prior to shut down. Obviously this advice only applies if you really tear up your car via autocrossing or HARD driving out in the country. Some people confuse a "power run" or two for hard driving. Getting on the gas pedal once in awhile, or taking a corner or two hard is not hard driving.
and btw you do know the oil continues to drain after the car is shut down, right?
I am simply stating the fact that for this engine you do not need a turbo timer and you do not ALWAYS...need to do a cool down in fact 99% of the time you do not. If the engine was not meant or could not handle daily driving dont u think we would have a lot more problems or that even mazda would have done something it. It is really simple to understand and I can understand why u feel u must argue this to death, but the fact remains the engine cools itself, a turbo timer is not needed but OF COURSE if you are at the track you should be taking the necessary precautions to make sure no harm goes to the engine.
that is all.
/thread
and btw you do know the oil continues to drain after the car is shut down, right?
I am simply stating the fact that for this engine you do not need a turbo timer and you do not ALWAYS...need to do a cool down in fact 99% of the time you do not. If the engine was not meant or could not handle daily driving dont u think we would have a lot more problems or that even mazda would have done something it. It is really simple to understand and I can understand why u feel u must argue this to death, but the fact remains the engine cools itself, a turbo timer is not needed but OF COURSE if you are at the track you should be taking the necessary precautions to make sure no harm goes to the engine.
that is all.
/thread
bykeryder4life
Member
speed3se-r: exactly my point. thank you for agreeing, always better safe than sorry. I just see new people reading a thread like this then going around shutting their car down after a drive and messing things up. I cant believe I even had to argue that to someone who is "knowledgeable" about turbo'd cars. It's a given in my book but to each his own I guess...
bykeryder4life
Member
AAMguy sorry to be a dick but I felt like you were talking down to me when I originally just asked if you were serious about what you said earlier, never have I heard someone say you dont need idle down time, so I took offense when you tell me try again next time...now I will try to be civilized, you say the oil drains from the turbo...does all of it drain out so it's completely dry or does most of the oil drain out and there's still some in there that COULD coke up with the heat?
well don't forget if u catch a red light or two you're idling the car right there...
since i confirmed that it is water cooled i usually let it idle for as long as it takes me to shut down radio, throw up handbrake, turn off vents/close windows cuz i'm not flooring it around the parkin lot ;-]
since i confirmed that it is water cooled i usually let it idle for as long as it takes me to shut down radio, throw up handbrake, turn off vents/close windows cuz i'm not flooring it around the parkin lot ;-]
bykeryder4life
Member
it doesnt take long with a water cooled setup so thats enough time to cool it down, especially the red lights and cruising parking lots...
More pix are at this link where one of our members is selling a reworked Hitachi-Warner K04. Good high quality pix clearly showing the water lines.
http://www.mazdas247.com/forum/showthread.php?t=123723962
Umm, a turbo timer is not needed for water cooled turbos... This is the reason I suspect most auto makers, minus old turbo diesel mercedes, use water cooled cartriges. With todays precision machining/casting on turbos, as well as better quality materials and designing, there is really no other reason to run water cooled than to prevent heat soak. It seems people never really do research into why they buy a timer, they just purchase one because of its “benefits” like a zombie.
Now, if you are running an oil cooled turbo, its not a bad idea.
To me Turbo timers for a water cooled turbo is a waste of money. It's like an A/F gauge...it's pretty much just a light show. Or a conversation piece.
From Garrett:
“””Garrett ball bearing turbochargers require less oil than journal bearing turbos. Therefore an oil inlet restrictor is recommended if you have oil pressure over about 60 psig. The oil outlet should be plumbed to the oil pan above the oil level (for wet sump systems). Since the oil drain is gravity fed, it is important that the oil outlet points downward, and that the drain tube does not become horizontal or go “uphill” at any point.
Following a hot shutdown of a turbocharger, heat soak begins. This means that the heat in the head, exhaust manifold, and turbine housing finds it way to the turbo’s center housing, raising its temperature. These extreme temperatures in the center housing can result in oil coking.
To prevent the effects of heat soak-back, water-cooled center housings were introduced. These use coolant from the engine to act as a heat sink after engine shutdown, preventing the oil from coking. The water lines utilize a thermal siphon effect to reduce the peak heat soak-back temperature after key-off. The layout of the pipes should minimize peaks and troughs with the cool water inlet on the low side. To help this along, it is advantageous to tilt the turbocharger about 25 about the axis of shaft rotation.
Many Garrett turbos are water-cooled for enhanced durability.”””
Now, if you are running an oil cooled turbo, its not a bad idea.
To me Turbo timers for a water cooled turbo is a waste of money. It's like an A/F gauge...it's pretty much just a light show. Or a conversation piece.
From Garrett:
“””Garrett ball bearing turbochargers require less oil than journal bearing turbos. Therefore an oil inlet restrictor is recommended if you have oil pressure over about 60 psig. The oil outlet should be plumbed to the oil pan above the oil level (for wet sump systems). Since the oil drain is gravity fed, it is important that the oil outlet points downward, and that the drain tube does not become horizontal or go “uphill” at any point.
Following a hot shutdown of a turbocharger, heat soak begins. This means that the heat in the head, exhaust manifold, and turbine housing finds it way to the turbo’s center housing, raising its temperature. These extreme temperatures in the center housing can result in oil coking.
To prevent the effects of heat soak-back, water-cooled center housings were introduced. These use coolant from the engine to act as a heat sink after engine shutdown, preventing the oil from coking. The water lines utilize a thermal siphon effect to reduce the peak heat soak-back temperature after key-off. The layout of the pipes should minimize peaks and troughs with the cool water inlet on the low side. To help this along, it is advantageous to tilt the turbocharger about 25 about the axis of shaft rotation.
Many Garrett turbos are water-cooled for enhanced durability.”””
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