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Post by trikkisixx on Aug 7, 2017 11:25:04 GMT
So this came up in a discussion with a mate of mine a little while ago and I meant to look into it.
Has it ever been done, where there is a turbo-only cooling system? As in a rad, pump just for the turbo? I know it's easy to plumb in the existing system to the turbo but it got me thinking. Surely this would aid with lower temps across the board and there's gotta be room for a little rad up front, almost like an oil-cooler I guess.
Any thoughts at all?
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Post by Rickster on Aug 7, 2017 16:17:19 GMT
Must be available because they are used on aircooled turbocharged engines evidently (according to Garret) google water cooled turbochargers and a pdf from Garrett pops up (cant get the link!)
However everything I read suggests its not worth the effort, bigger rad and coolant reroute would be more cost effective (and probably more efficient) - on a mx5 of course!
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Post by trikkisixx on Aug 7, 2017 16:20:47 GMT
Nice one, I'll take a look!
Yeah it was more of an idea and wondering why we didn't hear about it more. I need to look into the coolant re-route, I've been ignoring it for ages.
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Post by myothercarsa2cv on Aug 7, 2017 21:28:38 GMT
Water should be fairly easy to do with available parts, charge cooling is popular for supercharged fives. Electric water pumps aren't too expensive either. Oil on the other hand... that would be more complicated...
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Post by trikkisixx on Aug 8, 2017 8:11:58 GMT
I'm doing the oil feed/return the way that everyone does it as it's nice and easy, but was just thinking about the coolant. Maybe even use an oil cooler up front as it's basically just a mini radiator anyways, but plumbed up to an independent water pump keeping engine coolant and turbo coolant separate.
Again just an idea, was curious if it would work or had been done.
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Post by cupidstunt on Aug 8, 2017 15:56:53 GMT
I don't see why you would want to. The normal set up fine for keeping the bearings at the correct temperature.
Only thing that might be worth looking into is a separate water pump that would continue to pump coolant through the turbo after the engine is shhut down to stop the Coolant in the turbo from boiling and the heat soak causing the temperature to rise when the engine pump stops.
I know porsche used a setup like this on some of there cars. But as it's not carried over onto the mass market, and most turbos carry on working fine for years, I just see it as putting more stuff under the bonnet that might go wrong.
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Post by Rickster on Aug 13, 2017 21:52:33 GMT
I don't see why you would want to. The normal set up fine for keeping the bearings at the correct temperature. Only thing that might be worth looking into is a separate water pump that would continue to pump coolant through the turbo after the engine is shhut down to stop the Coolant in the turbo from boiling and the heat soak causing the temperature to rise when the engine pump stops. I know porsche used a setup like this on some of there cars. But as it's not carried over onto the mass market, and most turbos carry on working fine for years, I just see it as putting more stuff under the bonnet that might go wrong. Did Porsche use it because the engines (then) were air cooled?
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Post by cupidstunt on Aug 14, 2017 8:46:53 GMT
No. Water cooled 944.
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Post by cupidstunt on Aug 14, 2017 9:07:19 GMT
If you think about how a turbocharger works,
It's using very hot & high speed gases to spin a turbine.
Those same gases then continue out through the exhaust.
The turbo housing is designed to handle this heat. The bearings are not. During normal engine running the heat seeping into the bearings us removed mostly by the oil, which is in direct contact with the bearing, and to a lesser extent the Coolant (if water cooled ) which flows through a jacket close to the bearings.
When you shut off your freshly thrashed rice rocket, all the heat that was being blown out of the manifold, turbine housing and exhaust system is no longer.
Instead the heat travels back through the exhaust, manifold and turbine housing and into the bearings of the turbo.
This heat is then what causes the damage.
So can you see why extra cooling on a running engine would have very little effect.
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Post by myothercarsa2cv on Aug 14, 2017 18:49:17 GMT
That's a neat little system... should be fairly easy to retrofit to a turbo 5 using off the shelf parts and a bit of patience.
I'm currently working on an inlet temperature controlled intercooler spray for a race car. Wondering if Megasquirt or ME221 could control all this centrally...?
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