Individual (6) pyros

[Woodenhead]

Has anyone ever installed individual pyros ie. one for each cylinder on their CTD or another diesel. I'm thinkin it'd be kinda handy or more so interesting to see the variation from cyl to cyl. Might also come in handy for some diagnostics. I'm just thinking out loud here, I think I've heard of this on larger commercial engines but I'm not sure.



Take it easy

Mike

 

[KatDiesel]

Gets a bit exspensive when you want to do six, however I do know of one member that has plans to do that, but as of now its not completed.

 

[RustyJC]

It's common practice on larger industrial diesel, dual fuel and natural gas engines. You can get a manually-switched pyrometer to read individual cylinder as well as pre and post turbo temps from companies like Gerhardts (they advertise in the TurboDiesel Registry).



Rusty

 

[LSMITH]

LOL, by the time you got them all mounted you will be looking out a slit like an armored car

 

[Dkevdog]

Let's see, you should be able to get that done for somewhere around $800 (individual gauges) ... ... ... . I can think of alot better ways to spend $800 . I think it is extreme overkill. I had pre and post on my last truck, and might do the same again, but even that isn't really necessary.



Kev

 

[mbaston]

I had individual egts on my airplane using a "scanner". The scanner had eight channels.

Six I used for egts, one for oil temp and one for cylinder head temp. It had a digital display. You could automatically rotate through the temps or mannualy choose one and stay there. You might be able to get one of these used and only need one guage. You could use one for outside temp if you don't have the OEM unit. JPI is the better of them but a bit pricey.

 

[tgbol]

You can use one gauge and a rotary switch to flip back and forrth between the the different probes. I used to maintain a 16 cylinder gen-set. It had seperate injector pumps per cylinder. We We would fine tune it by equalizing each cylinder temp.

 

[WDaniels]

I already asked the question and was given the answer of "how will you know how far from the valves to drill the manifold and put the probes in?" Will the temp that close to the exhaust valves exceeding the "k" probe temp, especially at WOT with a load. These are good questions and short of doing it I don't know. Maybe you guys that get on the dyno's can do it. If someone has one of those infra red thermometers that goes up to 2000 F maybe they could take the temp on a dyno run. ?????? I've never seen a dyno much less used one so who knows?

WD

 

[Brandon]

who said we are using 6 gauges for all those pyros?

 

[Woodenhead]

About $50/thermocouple and $150 for TC and gauge it'd be around $400. 00 not including the switch to change from one cyl. to another.



I guess the thermocouple would have to go in the exh. manifold from the side ie. perpendicular to the cyl. bore. I wonder if the typical thermocouples used for pyros would be too restrictive when six of em are installed. I think a type K TC is good for well over 2000*F (maybe 2500*F), I don't imagine we have this much heat loss before the exhaust gas get to our pre turbo pyoros.



I've been seriously thinking about this one for a while, six gauges would be nice but are obviously not practical and would be tough to mount. It won't be soon because I don't have much free time but if/when I do I'll be sure to post the results.



Gotta spend it somewhere



Regards

Mike

 

[Brandon]

can you say data logger, he he he

 

[RustyJC]

Like I said, go to an industrial engine supply house (like Gerhardt's, for instance) and ask for an 8-channel manually switched pyrometer. This will give you 6 cylinders plus pre and post turbo capability all on one "gauge".



You may find that the individual cylinder temperatures will read slightly lower than the pre-turbo temperature. This is due to the scavenging effect during valve overlap where some cool (relatively speaking) intake air is blown into the exhaust and over the individual cylinder thermocouple. This scavenging during overlap helps cool the exhaust valve(s) and seat(s).



Rusty

 

[JLEONARD]

Would that make you a pyro-maniac?

Sorry, couldn't resist!!

Jay

 

[Woodenhead]

This is all good info and ideas, thank you.



RustyJC, I'll be contacting Gerhardts in the very near future to see what's available for switches. This was one thing I was wondering about. Thanks



LMAO Jleonard, "pyro maniac" good one



Take Care

Mike

 

[RustyJC]

The switch is an integral part of an 8-channel pyrometer. You have an analog gauge that gives the temperature readout. Directly below the gauge face is a rotary switch that selects channels 1 through 8. Everything is there in the gauge housing.



Tell Gerhardt's you want the modern version of the old Alnor 8-channel manually switched pyrometer.



Rusty