Getting a 300Tdi to run a little hotter - Defender Source
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  #1  
Old October 23rd, 2012, 05:27 PM
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Getting a 300Tdi to run a little hotter

I've noticed when I go to warmer climates, my mileage increases by about 3mpg. I also note that our thermostats are rated at 88*C (190*F), there seems to be nothing hotter offered by the usual LR part vendors.

Is there a practical way to get the the temps up to about 195*F without weirdness or does someone know of a thermostat inter-change that will do the job?

Thanks,
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  #2  
Old October 23rd, 2012, 07:41 PM
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For a number of reasons, you want to run at about 180F
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Old October 23rd, 2012, 07:45 PM
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keeping cool is always the challenge. only thing needed to get warm is a functioning thermostat. if you can't keep temps up, I cant think of anything else to replace beyond the t-stat.
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  #4  
Old October 23rd, 2012, 07:56 PM
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Quote:
Originally Posted by o2batsea View Post
For a number of reasons, you want to run at about 180F
Well, lets hear it.

------ Follow up post added October 23rd, 2012 05:05 PM ------

The guys over on LOST Jeep forum that are running the VM 2.8 CRD's (Mercedes designed diesel) in 2005-06 Liberty's, a weird encased thermostat ($$) and low mileage because of thermostats that fail open there by keeping the engine running at temps lower than ideal.

With this lesser mileage, due to their thermostats, coupled with what I've noticed about my 300tdi, I was wondering if raising my running temps a bit IF my/ our mileage may rise too.
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Old October 23rd, 2012, 08:41 PM
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Dennis, i think the increase in mpg is unrelated to your thermostat.
If you really want to experiment, cover up part or all of the radiator with a sheet of cardboard.

What matters more is fuel density, viscosity, and warmup time (how long before the engine comes up to temp - reducing windage and piston/bore clearances.)
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Old October 23rd, 2012, 08:45 PM
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I'm no physicist, or chemist or whatever expert you need to be to fully understand this stuff. I know I have read in several places that you want to keep the engine at about 180 cz that's going to allow for the pistons/rings to expand and seal properly while keeping the oil cool enough to lubricate properly. It also helps reduce internal engine build up of the brown stuff. I don't think running it at 190 or even 200 will do any great harm if any.
If it works for you, then go for it.
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Old October 23rd, 2012, 08:58 PM
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Your engine should run better in cooler temps since the air is denser. However the engine might not run as well if it never reaches the correct operating temps. If you want to play try placing a piece of cardboard in front of the radiator but do not block the inner-cooler. You could also remove the fan. I would be careful as you do not want to get too hot and blow a head gasket.
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  #8  
Old October 23rd, 2012, 09:09 PM
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This has been a discussion on TDIclub, which is filled with a lot of engineers, last i checked they said running the tdi's hotter did net better fuel economy and more efficiency, but you you want the air used for combustion cold, as well as the the air going through the intercooler, the problem is that running the motor hotter is that it is not good for it, how bad it is to run it hot, i have no idea. From what i remember they put some snow shields over the radiator and front vents.
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Old October 23rd, 2012, 09:35 PM
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The VM 2.8 CRD has an interesting device on the serpentine belt route, it's a viscous water heater, controlled by a clutch much like an AC compressor. From what I gather, it's purpose is to get the little diesel engine up to operating temperature faster in order to use fuel more efficiently. So I'm inclined to think that a modest rise in our 300Tdi may give us a few miles to the gallon advantage.
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Old October 23rd, 2012, 09:45 PM
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I run a proper muff in the winter/cooler weather on the Tdi (and also the Series)...I feel it helps the engine be more efficient and therefore get up to temp quicker (and stay there easier). It's the same principle as the cardboard...but works better long term.
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Old October 23rd, 2012, 10:07 PM
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To answer the question, yes, there are common thermostats that are at 195. I don't feel like figuring it out for you. Take it to am auto arts store and find one that is the same physical size with a bypass shutoff.
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