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Old 06-16-2016, 09:23 PM   #261
Skoolie
 
Join Date: Oct 2014
Location: Maple Ridge BC Canada
Posts: 192
Year: 1998
Coachwork: Blue Bird
Chassis: TC2000 Rear engine
Engine: Cummins 8.3; MD3060
Rated Cap: 84
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Originally Posted by dgorila1 View Post
Vlad,
I started re-reading your build again before my boss walked in (oops, better get to work) and had a question: Considering the extensive about of fabrication you did adding underbody storage, the roof raise, body bracing, etc would you consider buying a coach bus and using that as your platform if you did it again? Just curious since the coaches are unibody construction with the full underbody compartments, already have good headroom, etc. Would starting with a coach have saved you any time, money or hassle? Either way I love your build, very inspirational!
I think coach is even better starting point. Schoolbuses are built on budget. If you can find coach with good headroom, storage under the floor and low mileage you can use it as a great conversion project.

The biggest challenge in my conversion are slideouts for sure. Without slideouts the whole conversion is really not a big deal.

The other problem for me is a work place, which I don't have right now.
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Old 06-16-2016, 09:48 PM   #262
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The engine is fully mechanical, no electronics. The only electronic thing I can see is throttle position sensor which is used by transmission.
...then it should be fairly easy to find a few more HP on this one, though certainly will need a GOOD EGT-sensor and if you can get the intercooler to work better - .....probably good enough!!

Working the intercooler will help a lot - better inflow and outflow for cooling air...

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Old 06-16-2016, 11:16 PM   #263
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Location: Clearlake, Northern California
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Year: 1992
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Chassis: TC-2000 Frt Eng, Tranny:MT643
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Originally Posted by Vlad View Post
... ...

The problem with egt is the distance of 40 feet.....
If I understand you right, you have pointed out something interesting.
Millicent's pyrometer (EGT gauge) came with wiring that is specific for the gauge and sender and cannot be modified or replaced with regular wire. I have no idea how it works. But the length of that special wire might be a problem. I seem to remember there were several lengths available, but who knows if there is one that would reach the length of a 40 foot pusher. You would want to talk to a commercial speedometer shop before making extensive plans. Or perhaps you can look it up online.
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Old 06-17-2016, 12:34 AM   #264
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Today it should be possible to get the reading "back there" and then send it digitally to the front - or even by bluetooth.
If there is nothing on the (after)market - I am sure one could rig something with Rasperry or Arduino, to get the proper signal and then send it wherever you want (even home if you desire!! )

But you are right - probably not going to find a pyro with a 45 ft lead!!

Cheers,

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Old 06-17-2016, 12:52 AM   #265
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Well, now I'm beginning to think of this as a challenge. So I googled it.
Took me about three seconds to type "Isspro pyrometer lead", and bang:
Isspro EV2 Gauges Pyrometer Lead Wire
They make it up to 60 feet long! End of problem.
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Old 06-17-2016, 01:14 AM   #266
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I said I don't know how these pyrometers work. What always puzzled me is that they use no electric connection to power it. Well, here is the answer:

"If something's too hot to handle, it's no good trying to measure its temperature with an ordinary thermometer. You could try a thermocouple instead—a kind of thermometer that works by generating electricity according to how hot it gets."

It makes its own electricity.

http://www.explainthatstuff.com/how-pyrometers-work.html

So... our kind of pyrometer is not actually a "real" pyrometer, scientifically speaking. Doesn't matter, of course. I'm very glad I installed mine.
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Old 06-17-2016, 01:18 PM   #267
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WOW!! 65 feet is loooong run!

I think I'd still rather get a short as possible run and transmit the values by othe means....
I think these wires cannot be repaired and are rather stiff - once broken - get a new meter.....

IF there is no other way to get the numbers put a small camera in front of the gauge in the engine room and send the video up front!!

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Old 06-17-2016, 01:50 PM   #268
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The lead is not terribly stiff. I remember no difficulty routing it.
I expect it cannot be repaired (without risk of messing up the calibration).
But you wouldn't need to buy a new gauge, nor sender. The lead is a separate part.
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Old 06-17-2016, 02:58 PM   #269
Skoolie
 
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When it comes to pyrometer in our application we have 2 options. First get egt sensor, special extension wire and gages. Second get egt sensor read it right there by engine transmit digital or analog signal the front via regular wire. Use digital or analog signal to display value.

In both cases thermocouple egt sensor is used. In first case thermocouple wire is used for extension. In second case regular cat cable can be used, but some sort of extra devices must be used. I am thinking about using arduino to use it for this task.
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Old 06-17-2016, 04:29 PM   #270
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Vlad,

I believe there is NO extension for pyrometers (unless you have the proper gear to re-calibrate). You buy them with the needed length of wire and that's how they are calibrated at the factory - if you use a given set, you HAVE to replace a broken wire with the same type and LENGTH or your readings become meaningless....

I agree on the Arduino (or Rasperry) approach, especially as you could use the same gadget for other uses! You can send LOADS of data and even control a few items back there if you want too!!

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