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Thread: Exhaust Gas Temps

  1. #61
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    Exhaust Gas Temps

    PM sent Mick.

  2. #62
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    Exhaust Gas Temps

    Hi Wally...I ordered a seperate EGT type like the type we use...with the hose type clamp...it did go upto 600c when I put the sensor in a blowtorch burner for a few sec a few nights ago...so it will read higher...as you say...maybe I need to alter its mount to go deeper.

    Odd though...it was neck and neck at 300c.

    Nick.

  3. #63
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    Exhaust Gas Temps

    I believe that it is generally accepted that the exhaust gas flow tends to have a temperature gradient in the "pipe" and slower, and of lower temperature, at the outside of the gas "column" (i.e closer to the pipe) being more pronounced at higher revs where I guess surface friction has a greater effect but I am surprised that even if the sensor was actually mounted on the "pipe" it would "stop" at 300C.
    However, exhaust gas flow, particularly in a 2 stroke with "tuned exhaust", even if only mildly tuned as in the Rotax, obeys the rules of a "black art":-).

  4. #64
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    Exhaust Gas Temps

    Nick,

    BTW. Your post at 10.24 this morning says the probes are 400 mm from the piston ?

    Shurely shome mistake ? As that's roughly 16 inches.

    [On their 912 4 strokes Rotax ask for 100 mm = 4"].

    FWIW. When my 447 was running EGT read 1250 F = 675 C. But as someone has pointed out, it's all relative when using such devices.

    mike hallam.

  5. #65
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    Exhaust Gas Temps

    Good point.. I missed that...
    400mm from piston... presumably the skirt which from memory is approx 60mm from the flange?

    400mmm would equate to approx 4 times the "correct" distance.. so "anything could be correct":-)

    For the 503 and 582
    Quote from Statomaster.

    "The EGT probes are placed 38 mm (1 1/5 inches) from the engine exhaust port. Threaded bosses
    are normally welded to the exhaust for use with M8 x 1 thread EGT probes. Otherwize, holes are
    drilled and clamp-type EGT's are installed. "

    Attached files

  6. #66
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    Exhaust Gas Temps

    Sorry...of course I should have said 100mm 4"

  7. #67
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    Exhaust Gas Temps

    Wally took the hose clamp off the egt sensor...sits well inside the manifold now...agrees with the trikes own Westech gauge...well indicates 25c less but I somehow think the digital version is more accurate....must have not been sitting in the main flame path enough.

    Handy bit of test kit.

  8. #68
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    Exhaust Gas Temps

    Interesting... seems to "prove" that the gas had a higher temperature gradient than I thought....
    The Westach is calibrated with a cold junction temperature of 24 degC and I believe quoted accuracy is +- 2% FSD.
    The digi meter is +-1% (+-1 digit) and may well include cold junction compensation.
    So both readings could be well within their respective tolerances of the "actual" temperature. "yer pays yer money and makes yer choice":-)

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