Mazda scientifically tests oil vs water cooled turbos
#1
Mazda scientifically tests oil vs water cooled turbos
Bumpstart was kind enough to scan the turbo engine section of the series 4 Rx-7 training manual which is basically a Service highlights style document. I'm always on the lookout for random tidbits of information, and I noticed in here that Mazda studied the temperature difference in an oil cooled vs water cooled [presumably stock] turbo:
You can see that with the oil cooled turbo, the temperature of the "metal" (probably the turbo CHRA) shoots up after shutdown and remains more than 100C hotter than the comparable water cooled turbo.
You can see that with the oil cooled turbo, the temperature of the "metal" (probably the turbo CHRA) shoots up after shutdown and remains more than 100C hotter than the comparable water cooled turbo.
#4
tard of teh century
Very cool little graph to show the difference, definitely makes me glad I'm running water cooled. Garrett posted up a little pdf on water cooled turbos as well and shows a picture of the chra and what they're getting at with the oil coking.
http://www.turbobygarrett.com/turbob...er_Cooling.pdf
You guys have probably seen it but I figure I'll post it anyways, I just liked seeing what was actually happening to the turbo on the inside with the oil residue as I've only taken apart a couple turbos and they were both watercooled.
http://www.turbobygarrett.com/turbob...er_Cooling.pdf
You guys have probably seen it but I figure I'll post it anyways, I just liked seeing what was actually happening to the turbo on the inside with the oil residue as I've only taken apart a couple turbos and they were both watercooled.
#6
For the record, clearly running water cooled is better for the turbo. But I do not currently have an oil cooled turbo on my personal 7. There are a few reasons for this
1) The T04R turbo I have is journal bearing but I would not run a ball bearing turbo without water cooling
2) I don't drive the car much-- 2-3 thousand miles a year, and I change the oil every thousand miles or so
3) I wanted simpler plumbing
4) I got the turbo used and I didn't feel like spending more money (cheap bastard)
5) I am willing to wait a few seconds to cool it down before I shut the engine down, but as the graph above shows that probably has limited effectiveness
6) And MOST IMPORTANTLY... If I am running a turbo blanket and no blowoff valve I might as well abuse the turbo even more I am genuinely curious how long the turbo will last with me doing everything wrong
1) The T04R turbo I have is journal bearing but I would not run a ball bearing turbo without water cooling
2) I don't drive the car much-- 2-3 thousand miles a year, and I change the oil every thousand miles or so
3) I wanted simpler plumbing
4) I got the turbo used and I didn't feel like spending more money (cheap bastard)
5) I am willing to wait a few seconds to cool it down before I shut the engine down, but as the graph above shows that probably has limited effectiveness
6) And MOST IMPORTANTLY... If I am running a turbo blanket and no blowoff valve I might as well abuse the turbo even more I am genuinely curious how long the turbo will last with me doing everything wrong
#7
"Elusive, not deceptive!”
For the record, clearly running water cooled is better for the turbo. But I do not currently have an oil cooled turbo on my personal 7. There are a few reasons for this
1) The T04R turbo I have is journal bearing but I would not run a ball bearing turbo without water cooling
2) I don't drive the car much-- 2-3 thousand miles a year, and I change the oil every thousand miles or so
3) I wanted simpler plumbing
4) I got the turbo used and I didn't feel like spending more money (cheap bastard)
5) I am willing to wait a few seconds to cool it down before I shut the engine down, but as the graph above shows that probably has limited effectiveness
6) And MOST IMPORTANTLY... If I am running a turbo blanket and no blowoff valve I might as well abuse the turbo even more I am genuinely curious how long the turbo will last with me doing everything wrong
1) The T04R turbo I have is journal bearing but I would not run a ball bearing turbo without water cooling
2) I don't drive the car much-- 2-3 thousand miles a year, and I change the oil every thousand miles or so
3) I wanted simpler plumbing
4) I got the turbo used and I didn't feel like spending more money (cheap bastard)
5) I am willing to wait a few seconds to cool it down before I shut the engine down, but as the graph above shows that probably has limited effectiveness
6) And MOST IMPORTANTLY... If I am running a turbo blanket and no blowoff valve I might as well abuse the turbo even more I am genuinely curious how long the turbo will last with me doing everything wrong
On turbine engines we use a 2 minute cool down before shutting down the engine.
This is also the orginal purpose for turbo timers. ( driving slowly back through the subdivision for 2 mins. counts also)
Barry
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#9
Eh
iTrader: (56)
Great info you posted though. I know a lot of us dont say it enough, but we all appreciate all the info you dig up on these cars/engines. Keep it up.
#11
Rotary Revolutionary
iTrader: (16)
More heat is never good, period.
The extent to which it is detrimental may be debatable and may even ultimately be proven to be negligible, but it is undeniable. Choosing not to use water cooling on a turbo AND engine that is already setup for it is just lazy (and cheap). Choosing not to add it on an engine/turbo not set up with such accommodations is a slightly different story.
Thanks for the info! Always enlightening.
The extent to which it is detrimental may be debatable and may even ultimately be proven to be negligible, but it is undeniable. Choosing not to use water cooling on a turbo AND engine that is already setup for it is just lazy (and cheap). Choosing not to add it on an engine/turbo not set up with such accommodations is a slightly different story.
Thanks for the info! Always enlightening.
#13
Original Gangster/Rotary!
iTrader: (213)
Does anyone have any experience with the new oil-cooled ball bearing Precision turbos and/or oil cooled BW turbos on the road race course? Precision claims their newest oil/air cooled center sections work well without the water cooling...... I'm not really convinced yet.
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