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Pyrometer-Why?

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pbutler

12-09-2006 06:34:00

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A couple tractors I have looked at lately have pyrometers hooked up to the turbo. Now I know they measure temp but I am not sure why?

1) How is that any differnet than engine temp?
2) What would you do if it starts to get to hot differently than general engine overheating...and why would it?

Paul

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buickanddeere

12-09-2006 16:52:14

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Re: Pyrometer-Why? in reply to pbutler, 12-09-2006 06:34:00

When metal gets too hot it looses strength and becomes soft. Either pistons will melt, cylinder walls scuff if the lube oil is average quality, exhaust valves loose the head off the stem or turbine blades stretch like taffy and whack into the housing. In short; bad sounds, smoke and $$$$$$$$$$$$$ out of your pocket.

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RodInNS

12-09-2006 14:27:11

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Re: Pyrometer-Why? in reply to pbutler, 12-09-2006 06:34:00

Well, some of us like to turn the screw a bit, so we gauge them up a bit.... the pyro being one. I have a pyro installed in the pipe after the turbo on one tractor. The only real thing I use it for is to watch the temp on a hard pull. When it starts to sustain a high temperature, then it's time to back off. I don't worry too much about short peaks, but long hard pulls with sustained high temperatures. For what it's worth, I've seen temperatures of 1150 F, in the pipe, after the turbo. It's also interesting to watch the pyro at times as you learn a lot from it... Especially on cooldown and things like that. It's handy for all it costs.

Rod

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banjo

12-09-2006 07:54:37

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Re: Pyrometer-Why? in reply to pbutler, 12-09-2006 06:34:00

It also depends on whether it's pre turbo or post turbo. if it is post turbo the temps could be off by 300 degrees. it is always best to install before the turbo. Those pistons will melt with too much heat.

I have a pyrometer,fuel and turbo pressure gauge on my truck. WHY , because i have a edge comp on it.With a standard transmission sometimes it's a little slow to pass a vehicle. I can adjust the fuel rate and bump the ponies 20-100. Sometimes ya need a little more git up and go.

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the tractor vet

12-09-2006 07:36:51

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Re: Pyrometer-Why? in reply to pbutler, 12-09-2006 06:34:00

Well it is sorta like this , Now in all my years of working on hopping up and tweeken engines driving truck and running equipment just how many of you have ever said that this car -truck - tractor - bulldozer ever had enough POWER and IF IT JUST HAD JUST A LITTEL BIT MORE!!!!!. AND there will alway be someone that can and will turn the screw or tweek the computer chip to JUST GIVE IT A BIT MORE . Now sometimes a LITTEL twist of the screw realy won't hurt noting and will not real bring EGT up enough to worry about it But that nice shinny guage sure does look good setting up thereand also adding that shinny stright pipe look realy COOL and makes lots of niose and make ya think ya got a big hammer . But if one still is not happy with said engine after he has added the turbo on only gained maybe 10-15 ponys on a stock pump setting if he got that then the next thing is lets open up the pump JUST a Littel Bit as i have this new pyrometer and i can watch it so they open the pump[ and now instead of running a lets say 750 drgrees under load at the stock setting now with that littel twist of the screw she is now running up wards of 1100 -1200 dgrees . Well as they say when they go they go but when they GLOW THEY BLOW.

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No tools

12-09-2006 10:11:35

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Re: Pyrometer-Why? in reply to the tractor vet, 12-09-2006 07:36:51

Agree Agree Agree
Leave all the screws an wires alone on them pumps Etc.throw all the dang chrome stakes over the fence.take a ball bat knock the pyrometer gauge CLEAR out the country.Now put the muffler on the poor ole engine and lesson now it'll change it sound at the exhaust when it wants relief.There for the gauge well Money>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>.Bill

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Allan In NE

12-09-2006 07:40:38

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Re: Pyrometer-Why? in reply to the tractor vet, 12-09-2006 07:36:51

Amen, Brother. And Amen. :>)

Allan

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Coloken

12-09-2006 07:25:25

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Re: Pyrometer-Why? in reply to pbutler, 12-09-2006 06:34:00

I put one on the first diesel tractor I owned. The reason was I wanted to know just how much I could "lug" it without doing harm. It told me that my first impressions were right on, and that at a certain point the temp would realy start to climb. Nothing common sense couldn't have told me, but for a poor driver it would "yell" at him.

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Aaron Ford

12-09-2006 07:20:20

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Re: Pyrometer-Why? in reply to pbutler, 12-09-2006 06:34:00

Gonna throw in my $0.02. I would install one if I was buying a turbo diesel. Simply for the piece of mind. It would be cheap insurance against it running lean or any other turbo/injector malady. It may indicate that it was turned up, or it may indicate someone who was obsessed with keeping it safe. Or someone thought it was cool...

Let's go Mountaineers,

Aaron

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Bob

12-09-2006 10:09:02

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Re: Pyrometer-Why? in reply to Aaron Ford, 12-09-2006 07:20:20

Pyrometer... to watch for a diesel RUNNING LEAN???

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Luke S

12-09-2006 06:49:58

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Re: Pyrometer-Why? in reply to pbutler, 12-09-2006 06:34:00

Your normal engine temperature gauge measures coolant temps. Pyrometer measures exhaust gas temperature. It is important because if you get to hot on the exhaust temp you can burn up your turbo or your engine. If your exhaust temps get too high you have to back out of it and let it cool down, your pushing it too hard. Either because the pump is turned too high and giving the engine too much fuel, or because the load is way too heavy, or your in too high a gear with too heavy a load. On a stock engine that is not overloaded it is not a great concern, but on something that has fuel added or is pulled harder than it should it can be a concern.

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RustyFarmall

12-09-2006 06:49:39

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Re: Pyrometer-Why? in reply to pbutler, 12-09-2006 06:34:00

The pyrometer measures exhaust temperature which is different from engine temperature. With a turbo the exhaust temps can get way up there, but the actual engine temp will not be effected. If the exhaust temp gets too high the turbo can be damaged or destroyed. The usual method of reducing the exhaust temp when it gets too high is to shift to a lower gear, or otherwise reduce the load on the engine.

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Allan In NE

12-09-2006 06:44:50

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Re: Pyrometer-Why? in reply to pbutler, 12-09-2006 06:34:00

Hey Paul!

I've only "overpowered" one tractor in my life.

The trouble with turnin' up the smoke screw and shoovin' air down their throat is that they start to act a lot like a horse and can actually pull themselves to death.

Put a heavy load on 'em and they'll just keep pulling 'til they melt themselves down. The pyrometer let's ya kind of keep track of how hard you're really pushing that tractor.

It is kind of a "load" temperature indicator.

Allan

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pbutler

12-09-2006 06:53:10

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Re: Pyrometer-Why? in reply to Allan In NE, 12-09-2006 06:44:50

Thanks Guys! So while a pyrometer might be nice to have if it is aftermarket (as on the JD4840 I was looking at) then it is a good sign it has probably been turned up.

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R Walton

12-09-2006 16:26:10

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Re: Pyrometer-Why? in reply to pbutler, 12-09-2006 06:53:10

It doesn't really mean that it was turned up. Personally, if I have an engine with a turbo on it, and I am going to work it, (whether it is a truck or tractor) it is going to have a pyrometer on it. When I hit a hill in my Freightliner, I watch the exhaust temp. more than I do water temp. Running down the road it normally runs about 600 degrees. Normally pull a decent hill at 900 degrees. I have seen it as high as 1250. Then you know it is time to back out of it and drop a gear, and watch both exhaust and water temp. closely. I've heard of them melting down at 1500.

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Allan In NE

12-09-2006 07:02:27

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Re: Pyrometer-Why? in reply to pbutler, 12-09-2006 06:53:10

Can't really speak to that as I don't really know who came out with what and how different models are/were equipped.

My bottom-line rule tho, I never, ever even look at or will I ever buy a tractor that has came within 5 or 10 miles of a tractor pull, 'cause those guys really "try" to make 'em explode on purpose. :>)

Allan

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Colok

12-09-2006 07:29:49

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Re: Pyrometer-Why? in reply to Allan In NE, 12-09-2006 07:02:27

Or buy a pickup (commonly called a truck) that has had a snow plow or pulled a trailer. Too bad they don't make "overload" meters for them.

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kyhayman

12-09-2006 07:02:28

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Re: Pyrometer-Why? in reply to pbutler, 12-09-2006 06:53:10

To me, it is a sign that someone wanted to push this tractor to the edge of its mechanical life, and not melt it down before it was 99.9% worn out to sell to someone else.

Either that, or someone thought they were 'cool' to look at.

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Allan In NE

12-09-2006 07:04:26

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Re: Pyrometer-Why? in reply to kyhayman, 12-09-2006 07:02:28

You mean like those "cool" chrome exhaust pipes?

Allan

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Luke S

12-09-2006 07:06:55

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Re: Pyrometer-Why? in reply to Allan In NE, 12-09-2006 07:04:26

Hey now, you know those chrome stacks add at least 30HP!

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Allan In NE

12-09-2006 07:24:00

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Re: Pyrometer-Why? in reply to Luke S, 12-09-2006 07:06:55

LOL!

Yeah, they add 30 lbs of something. :>)

Allan

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135 Fan

12-09-2006 10:36:52

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Re: Pyrometer-Why? in reply to Allan In NE, 12-09-2006 07:24:00

What's the common phrase? If it don't go... Chrome it. Dave

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R Walton

12-09-2006 16:02:07

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Re: Pyrometer-Why? in reply to 135 Fan, 12-09-2006 10:36:52

I like the one that says "My favorite color is chrome" and "If it don't shine, it ain't mine"

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Mark

12-09-2006 13:55:42

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Re: Pyrometer-Why? in reply to 135 Fan, 12-09-2006 10:36:52

Now come on! back 30+ years ago, there was a kid I grew up with who had a '68 Ford with a chrome Kleenex dispenser and he swore it added 50 horsepower..it was so sick with it...he was afraid to remove it...hehehehehe!

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