Why doesn't anyone with single turbos run oil AND water cooled bearings?
#3
I know you don't need it, but some friends of mine were trying to convince me there is no reason not to have it. They are trying to tell me the cooling gains are well worth doing it. I'm just curious as to what those with some experience have to say.
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By watercooling the center housing you dramatically reduce the stress put on the oil seals. It's super easy to run some coolant lines the turbo, and it can substantially increase its lifespan.
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Originally posted by Gene
Corky Bell highly recommends them in his book. The stock 2nd gen turbo has it too. 3rd gens don't?
Corky Bell highly recommends them in his book. The stock 2nd gen turbo has it too. 3rd gens don't?
#10
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Originally posted by 1Revvin7
I know you don't need it, but some friends of mine were trying to convince me there is no reason not to have it. They are trying to tell me the cooling gains are well worth doing it. I'm just curious as to what those with some experience have to say.
I know you don't need it, but some friends of mine were trying to convince me there is no reason not to have it. They are trying to tell me the cooling gains are well worth doing it. I'm just curious as to what those with some experience have to say.
From SAE Paper 840252 (about turbocharging the 2.2l engine)
I would say that if turbo longevity was of any concern, water cooling is mandatory. And considering that rotaries are partially oil-cooled, I would want to spread the turbo cooling around to the oil and the coolant instead of just baking the oil. (Literally)
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Depends on the turbo design. Some are designed to run without coolant, while some require it. My 35/40 was water cooled, but my T66 is not. I don't have any numbers to back this, but I would think running coolant through a hot turbo would put more strain on the coolant system, possibly yeilding higher water temps.
#16
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Originally posted by Rotary Experiment Seven
Depends on the turbo design. Some are designed to run without coolant, while some require it. My 35/40 was water cooled, but my T66 is not. I don't have any numbers to back this, but I would think running coolant through a hot turbo would put more strain on the coolant system, possibly yeilding higher water temps.
Depends on the turbo design. Some are designed to run without coolant, while some require it. My 35/40 was water cooled, but my T66 is not. I don't have any numbers to back this, but I would think running coolant through a hot turbo would put more strain on the coolant system, possibly yeilding higher water temps.
#17
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Originally posted by Rotary Experiment Seven I don't have any numbers to back this, but I would think running coolant through a hot turbo would put more strain on the coolant system, possibly yeilding higher water temps. [/B]
#18
Isn't it give and take? Either way you are going to gain so much heat weather its in the oil or coolant, right?
Now if the turbo I want isn't water cooled is it worth an extra $80 to get it? Does it cost more to rebuild or anything? Heres the turbo I'm looking at currently:
http://store.yahoo.com/cheapturbo/t4b.html
For $79 it gives you a wet bearing housing and for $79 more than that a 360 degree thrust bearing. Sound good?
Now if the turbo I want isn't water cooled is it worth an extra $80 to get it? Does it cost more to rebuild or anything? Heres the turbo I'm looking at currently:
http://store.yahoo.com/cheapturbo/t4b.html
For $79 it gives you a wet bearing housing and for $79 more than that a 360 degree thrust bearing. Sound good?
#19
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Originally posted by Ryde _Or_Die
Isn't it give and take? Either way you are going to gain so much heat weather its in the oil or coolant, right?
Isn't it give and take? Either way you are going to gain so much heat weather its in the oil or coolant, right?
#20
Race cars often run oil-cooled only turbos due to the fact it's one less seal to fail. With turbos being rebuilt/replaced on a regular basis, bearing life isn't an issue for them. On the street, hands down, go with a water cooled bearing. All of GReddy's offerings (Mitsubishi) are oil cooled only. I have a plain bearing GT40 that's oil cooled only as well. I think the ball bearing stuff is both but the plain bearing stuff is oil sans water.
Michel
Michel
#21
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Ball bearing GT turbo's have to be, if not there is a seal inside that will fail and you will literally have ball bearings come out the oil drain, I've seen it. You cannot run these without water. Ask me how I know, personally I will go water cooled every time otherwise your just cooking your oil.
Last edited by Zero R; 05-28-04 at 10:20 PM.
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Originally Posted by peejay
But without the water cooling, you are literally cooking the oil in the bearing, causing (vastly) decreased bearing life, as well as degrading the oil more rapidly and raising oil temps - and oil quality/temperature is *critical* to a rotary engine.
What external bolt-on gadgets can be used for adding a water jacket, without replacing the bearing body?
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