Engine Pyrometer probe placement

[encantotom]

hi all,

i am going to put a pyrometer on my 8v92. most of the gauges require calibrated to the wire harness. i bought a Isspro ev series that uses standard 16 gauge wire according to their factory tech guy. however, it has an amplifier up front so is not switchable between dual probes back in the engine area. if i was going to do twin probes (one on each pipe from the exhaust manifold to the turbo, or preturbo) then i will have to do dual gauges. i looked at lots of them and picked the gauge i liked.

so, for those of you that have pyrometers, do you have one or two, and where are the probes at? for those of you with one, is it preturbo or postturbo and where is it at?

what temperatures do you read and where is your probe located?

thanks

tom mccloud

[fulltiming]

Tom, hopefully someone with a pyrometer equipped Newell will respond. If not, you might check on either the Yahoo groups DetroitDiesel (which is specifically for two stroke Detroits) or the Yahoo groups WanderlodgeForum.

[wallyarntzen]

Tom,
I'm going into the mountains today but I do have a peromitor. You can come over and look at the instalation if you like. If you need to see it today just come over and open the engine doors and help yourself. I will be busy all day and into the evening.
Tomorrow I should be here all day.
Wally

[ttikalsky]

Have a post turbo pyrometer. Normal readings 200 - 400 with max so far of 600. Have you considered using a switch and/or relay to share a gauge?


Troy Tikalsky
Waconia, MN
1986 Newell 40'

[encantotom]

yes i did consider that. in fact i am doing that for dual new engine temp sensors i am putting on a digital temp gauge to replace the hard to read analog one i have.

i called the manufacturers on the gauges i liked on the ability to switch between two thermocouples. the problem is that some of the gauges dont allow that and the ones that do require a calibrated gauge and wiring harness that i didnt want to spend 200 bucks on or wait for them. i only had a short window of two evenings to use the bus lift to get underneath.

so the gauge i am using, a isspro EV gauge has an amplifier you mount up front and will allow regular 16 gauge wires (2) to be run from front to rear with no calibration issues. their other gauges requried special harness and some of the other gauges wouldnt work at on on long runs like our units require.

as usual, i do things the hard way

later

tom

[JohnC]

My preference is placing the sensor a few inches downstream of the turbo outlet.

I have found that pulling long grades at higher altitudes, such as Monarc Pass in Colorado,noramlly necessitates reduced throttle due to high turbo temps

[fulltiming]

Thanks John. We appreciate your input.

[encantotom]

hi john, thanks for commenting. do you mean after the actual turbo housing and on the pipe that goes to the exhaust? or tapping into the actual aluminm turbo housing.

thanks again,

tom

[JohnC]

Much cheaper to screw-up the pipe then buying a new turbo housing.

[encantotom]

some results.

i put the pyrometer probe about 5 inches from the turbo, which is as close as to the turbo as i could get the welder in to weld the collar on the pipe.

it works great. wally and i drove to texas together and our pyro temps compared very closely. on a straight and level road with low boost, it was about 350-400 degrees. going up a moderate grade it would go up to 700 degrees or a little more. very close to what wally saw as we compared on the CB as we were driving for several days. so i am please with the results. what i never rembered to do was to shoot the temps with the IR temp gun to see pre and post turbo temps. i will try to remember to do that yet.

tom