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Author Topic: 8V-71N Thermostats  (Read 646 times)
Debo
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« on: July 01, 2013, 12:05:03 PM »

Hey ya'll,

Everything I read says my early 80's 8V-71N can use 170 or 180 degree thermostats. Any benefit/downside to one or the other? FYI, I live and travel in the southeast US, and have never had overheating problems. Just trying to figure out why there would be two options. Thanks in advance.
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1981 MCI MC9
Detroit 8V-71N
Spicer 4-Speed Manual
Outer Banks, NC (Nags Head)
wg4t50
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« Reply #1 on: July 01, 2013, 12:37:03 PM »

I would run the 180 f Tstats,
Dave M
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MCI7 20+ Yrs
Foretravel w/ISM500
WG4T CW for over 50 wpm for ever.
Central Virginia
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« Reply #2 on: July 01, 2013, 01:16:00 PM »

Hey thanks Dave. Is there a reason why I'd choose 180 over 170? That's what I'm trying to figure out. I'm guessing that if I had overheating problems I might want to choose the 170 so it would open sooner maybe? Just looking for reasoning more than anything. Thanks again.
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1981 MCI MC9
Detroit 8V-71N
Spicer 4-Speed Manual
Outer Banks, NC (Nags Head)
wg4t50
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« Reply #3 on: July 01, 2013, 01:30:36 PM »

If your overheating with 180 which will be fully open a 195, if still climbing you have a problem. With a 170 you will still over heat.  I prefer running in the 180-195 range if it goes to 200 I start the mister and do not let it get above 205.
Others have different opinions I am sure. Sooo YMMV
Dave M
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MCI7 20+ Yrs
Foretravel w/ISM500
WG4T CW for over 50 wpm for ever.
Central Virginia
pvcces
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« Reply #4 on: July 04, 2013, 03:27:48 PM »

The thermostat is only there to control underheating, not overheating. Higher temperatures, short of hurting the engine, will increase efficiency and performance.

The main benefit to using a 170 is the additional heating time of the coolant required before it overheats. If you do not have an overheating problem, there is no benefit to using the 170, that I know of.

It will take a bit longer before overheating, if you still have the original heating equipment. We have 13 gallons of coolant to heat up, so it takes a while.

For what it's worth.

Tom Caffrey
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Tom Caffrey PD4106-2576
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Ketchikan, Alaska
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« Reply #5 on: July 05, 2013, 11:51:39 AM »

Thanks Tom. Good explanation. Pretty much what I was thinking, but just wanted a second opinion. My radiators were replaced before I bought my bus, so I have no cooling problems whatsoever. Of course my conversion is still pretty light and I'm a flat-lander, but time will tell I reckon'.
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1981 MCI MC9
Detroit 8V-71N
Spicer 4-Speed Manual
Outer Banks, NC (Nags Head)
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