PYROMETER
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=158489
Printed Date: 22 May 2025 at 2:36pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: PYROMETER
Posted By: FREEDGUY
Subject: PYROMETER
Date Posted: 24 Feb 2019 at 3:30pm
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There is a topic on another forum regarding an M&W turbo kit on a green 4020. The "kit" includes a pyrometer gauge (and new oil pan). Why is such a gauge needed for an aftermarket unit? Did AC have a gauge in any dash as "factory"? Our XT doesn't have one. Thanks
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Replies:
Posted By: waldersha
Date Posted: 24 Feb 2019 at 3:45pm
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Generally speaking, turbo's = more fuel/more air/ more heat. The pyrometer is to monitor exhaust temps, so you don't get melt pistons etc.
As to an allis having one as OEM, I can't speak to that, but I'm sure others know.
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Posted By: tomstractorsandtoys
Date Posted: 24 Feb 2019 at 5:27pm
I was told that when new M&W gave you the choice of a pryometer or a chrome strait pipe and most farmers chose the chrome pipe. When running a 4020 with a pyrometer and working it hard it is interesting to watch how much the guage moves. Especially on something like a forage harvester where the load varies. The large oil pan was an option and often only added when there was a major tune up in hp. I have a 4020 that the last owner installed the M&W more for better fuel economy than increased power(it was set at 105hp) and the dealer told him the big oil pan was not needed.Tom
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Posted By: randy
Date Posted: 24 Feb 2019 at 6:00pm
Some of the IH 86 series had pyrometers on them from the factory, if i remember right. I used to have one on my 7060, DRI was the brand but the probe quit. I should find another probe.
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CA WD WD45 D17 D17 Diesel 7060 8050 8070
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Posted By: jiminnd
Date Posted: 24 Feb 2019 at 9:44pm
When I worked at a Ford tractor dealer when the 8000 was new, we turboed some of them, always put a pyromter on them. When I bought my D21 I put one on for my own interest, took it off when traded and still have it. It is amazing the temp difference when working hard. edit I think the 1370 Case has a factory installed.
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1945 C, 1949 WF and WD, 1981 185, 1982 8030, unknown D14(nonrunner)
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Posted By: AC7060IL
Date Posted: 25 Feb 2019 at 3:00am
An EGT(exhaust gas temperature) of < 1350 F degrees is usually recommended on most mfg’ers stock turbo diesel engine. A prolonged or constant load at/or over that temperature will usually cook the engine. A EGT of 1150-1200F might be ok all day long, but a spike to 1300-& higher should not be long (seconds??) before damage happens. Increasing the engine’s oil capacity helps dissipate increased engine heat(larger oil pan). An intercooler using radiator coolant to cool intake air will help too. Most operators do not realize that a loaded tractor/truck’s turbo Can add 300-500 F degrees as it compresses intake air. In theory, 80F degree outside air plus turbo compression of 420F, minus 190F intercooler coolant equates 310F combustion intake air. In actuality, those numbers may not be that efficient. Common turbo/aftercooled(air-to-air) at 80F outside air, truck EGTs may be;
- AT IDOL, 350-400F,
- Economically loaded, 600-800F,
- Heavily loaded, 1000-1200F.
So an OTR trucker, running at 60F night, usually sees more engine torque, better fuel efficiency, & easier on truck components. Same principles may apply to farm tillage work at night. The older tractor intercooler’s 190F coolant TRIES to reduce intake air before it enters combustion chamber. Few, if any 1960-1980s farm tractor mfg’ers in the USA factory installed a pyrometer. In many cases, the tractor’s radiator coolant temp gauge was probably the only operator indicator of higher EGTs??? How often do you hear complaints like, “I’ve blown out the radiator, but I still Can’t seem to keep that tractor’s temp out of the RED!”
So a pyrometer installed in the exhaust manifold, just prior to the turbo, will read EGT that is usually displayed in the cab’s dash EGT gauge for operate to monitor. It helps que operator as to the level of load of the tractor/truck. If EGT climbs, then Operator could then reduce engine throttle, gear down, lift or reduce trailing equipment load(farm tillage, silage chopper, etc...?). A truck driver would do similar adjustments. In both power units a lower EGT usually equates to better fuel economy(lighter foot).
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Posted By: PaulB
Date Posted: 25 Feb 2019 at 5:12am
LIGHTER FOOT? Who has one of those? 😃😃😃 I got into driving trucks backe in the early 70s when most everyone around had Dogtriots. Back then I might have weighed 120 pounds and needed every ounce to hold the accelerator to the floor except when I had to start downshifting when a hill appeared on the horizon. It’s a wonder that those engines would stand the abuse that they were given. Many nights when going up mountains ( always in the low side gears) they would breathe fire like a dragon 🐉. Sometimes it would take 20 minutes or more to get over the summit. Even the giant gas engines were not considered to be running good if there wasn’t fire out the exhaust. Of course we know better nowadays.
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If it was fun to pull in LOW gear, I could have a John Deere.
Real pullers don't have speed limits.
If you can't make it GO... make it SHINY
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Posted By: lentsch
Date Posted: 25 Feb 2019 at 9:45am
The Detroits were known as "screamin road oilers".
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WD,D15,190XT,7000,8010x2,7060,8070
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Posted By: SteveM C/IL
Date Posted: 25 Feb 2019 at 9:38pm
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if it's factory stock,you probably can't work it hard enough to need a pyro. When your 170hp tractor is set at 220hp,it's easy to heat the exhaust. Pyros and oil guages are in the same catagory for me.More information is a good thing.
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