2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

Oil cooler thermostat.

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Old Jul 11, 2009 | 11:07 AM
  #1  
just startn's Avatar
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From: Elyria, OH
Oil cooler thermostat.

I searched and searched. This is all i could find.
https://www.rx7club.com/single-turbo-rx-7s-23/oil-cooler-thermostat-necessary-793376/
http://forum.teamfc3s.org/showthread.php?t=50764&page=2

I was in the mits of cleaning my oil cooler. figiured i would take off the drain plug because i was flushing the inside out. Popped it off and no thermostat in it sweeettt. I never ran a oil cooler without one. My question is is it necessary?
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Old Jul 11, 2009 | 12:01 PM
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I haven't had one for over a year...no problems.

You are aware that you can't just remove the thermostat without plugging it's hole (nut, bolt and washers work) or the cooler is in permanent bypass mode.
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Old Jul 11, 2009 | 01:41 PM
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I would think the thermostat in the cooler is to allow the oil to circulate in the engine to bring it to operating temp faster to reduce engine wear. With no thermostat it would take full circulation path and take longer to bring to operating temp. But I doubt it would make alot of difference?
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Old Jul 11, 2009 | 03:06 PM
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just startn's Avatar
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Originally Posted by clokker
I haven't had one for over a year...no problems.

You are aware that you can't just remove the thermostat without plugging it's hole (nut, bolt and washers work) or the cooler is in permanent bypass mode.
am aware now. but how is it in permanant bypass mode? when the stat opens wouldn't tht be the same thing as not having one in there? i never really looked at the oil cooler to see of it would go in one hose and out the other.
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Old Jul 11, 2009 | 03:07 PM
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just startn's Avatar
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From: Elyria, OH
Originally Posted by jdonnell
I would think the thermostat in the cooler is to allow the oil to circulate in the engine to bring it to operating temp faster to reduce engine wear. With no thermostat it would take full circulation path and take longer to bring to operating temp. But I doubt it would make alot of difference?
Yea...and my car has no a/c, p/s, heat, and i never really put the top up so i only drive it on nice days. I always let my car run for a long time and get warm before i drive it.
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Old Jul 11, 2009 | 04:24 PM
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The end of the cooler that the hoses attach to is divided into two chambers.
The thermostat fills a hole that goes from the intake side to the output side- when the thermostat is cold this hole is open and most of the oil bypasses the cooler matrix and just flows right back to the engine.
As the thermostat gets warm it expands, closes off this bypass hole and the oil is forced through the cooler matrix.

If you simply remove the thermostat, the bypass is always open and the oil- lazy bugger that it is- will simply take the path of least resistance and flow right back to the engine rather than endure the confines of the cooler tubes.
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Old Jul 11, 2009 | 10:37 PM
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From: Elyria, OH
Originally Posted by clokker
The end of the cooler that the hoses attach to is divided into two chambers.
The thermostat fills a hole that goes from the intake side to the output side- when the thermostat is cold this hole is open and most of the oil bypasses the cooler matrix and just flows right back to the engine.
As the thermostat gets warm it expands, closes off this bypass hole and the oil is forced through the cooler matrix.

If you simply remove the thermostat, the bypass is always open and the oil- lazy bugger that it is- will simply take the path of least resistance and flow right back to the engine rather than endure the confines of the cooler tubes.
yea i looked at it today. figured i would just see how long the stat is when its open and put a bolt in it that long/ what did you do for yours?
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