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Help Anyone know where to get some temperature sensors for monitoring cylinder head temps?

Discussion in 'The Pub' started by KICKERMAN360, Mar 18, 2018.

  1. KICKERMAN360

    KICKERMAN360 Well-Known Member

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    So I was running the NSR today and it felt like the exhaust gas on one silencer was significantly hotter than the other. This engine probably hasn't had a rebuild for 15 years so I'm wondering if there is an air leak somewhere (it smokes up well, both exhausts look like everything is okay by the way).

    I was wondering if anyone had recommendations for temperature sensors that I could mount near the dash and run sensors to mount onto the cylinder heads?
     
    • Well said! Well said! x 1
    KICKERMAN360, Mar 18, 2018
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  2. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    You can get this type of temp sensor, mount's between the head and spark plug, then you just need an appropriate gauge
    It's popular with Racing Go Kart's and also Paraglider's
    https://www.ebay.com.au/p/K-Type-Thermocouple-Temp-Sensors-With-18mm-ID-Washer-for-Cylinder-Head-special/1263205322?iid=380897780699&_trkparms=aid=222007&algo=SIM.MBE&ao=2&asc=20151029142714&meid=c634a6aaa9834da9bc6febf465aa2361&pid=100005&rk=1&rkt=2&sd=221660077297&itm=380897780699&_trksid=p2047675.c100005.m1851

    s-l640.jpg

    Cylinder head temp gauge's
    https://www.google.com.au/search?q=...jvXZAhWGE7wKHRz1BqwQ_AUICygC&biw=1680&bih=919
     
    my67xr, Mar 18, 2018
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  3. KICKERMAN360

    KICKERMAN360 Well-Known Member

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    KICKERMAN360, Mar 18, 2018
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  4. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    I don't think your spark plug temp would be under 110 degree's, more like 220 degree's or more.
    Self clean temperature of a spark plug is somewhere between 400 degree's and 800 degree's, and allowing for a bit of temperature drop from the head it would be a bit lower.


    These gauge's are pretty small, 37mm and measure between 200 and 1200 degree's
    To make it into a spark plug style sender you could clamp a large copper ring terminal to the Epman sender unit like the other pre made one's
    Also you could buy a second sender and then just use a DPDT switch and use the same digital meter and then just switch it over to read the second temp

    https://www.aliexpress.com/item/PIV...ecae-46e9-9441-75878a299ffe&priceBeautifyAB=0

    s-l500.jpg
     
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    my67xr, Mar 18, 2018
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  5. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Another option,
    Trail Tech head temp gauge and 14mm sender, $58 inc delivery
    They had different size spark plug sensor's too, 10mm, 12mm, 14mm
    https://www.ebay.com.au/itm/Trail-T...064982&hash=item4d6c2a213f:g:KwoAAOSwt4xaY8Xf

    Also available in orange-
    https://www.ebay.com.au/itm/Trail-T...142719&hash=item3d56dd40d9:g:HjkAAOSwu6taY8X3

    The sender's for these are available seperately too but are expensive for this brand.
    I reckon you might be able to use one of the cheap one's i linked up in the first post, but you would need to find a plug to suit the Trail Tech socket

    They are sold in Australia as well-
    https://www.ebay.com.au/itm/Trail-T...929202&hash=item2a920242cb:g:aFoAAMXQ-alQ4M5p


    s-l500.jpg
    s-l500.jpg

    s-l1600.jpg
     
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    my67xr, Mar 18, 2018
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  6. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    These look interesting too
    M6 thread temp sender, 20 degree's to 400 degree's, $1.96 each inc delivery
    https://www.ebay.com.au/itm/Tempera...hash=item58fc59b355:m:mj7Dw_MQ1Qi2uPEtn_3sK2w


    FZR250R 3LN3'S have 6mm bung's welded into the header pipe's at the bottom, hmmm got me thinking now


    s-l1600.jpg

    And a gauge to suit, $19 inc delivery, there's some more listed on his page from about $12
    https://www.ebay.com.au/itm/Univers...673496?hash=item33b0827bd8:g:pX4AAOSwGNtZv2wW

    A few more in their store
    https://www.ebay.com.au/sch/m.html?...0.Xtemperature.TRS0&_nkw=temperature&_sacat=0

    3686.jpg
     
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    my67xr, Mar 18, 2018
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  7. KICKERMAN360

    KICKERMAN360 Well-Known Member

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    Wow, good finds there!

    Ultimately I want the sensors to go to a Raspberry Pi that controls everything. But, for now, This looks like it will be perfect. Thanks
     
    KICKERMAN360, Mar 18, 2018
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  8. jimv50

    jimv50 Well-Known Member

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    I had a CB650 that was running a bit rough and eventually narrowed it down using one of these I got from eBay for a tenner temp.jpg
     
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    jimv50, Mar 19, 2018
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  9. KICKERMAN360

    KICKERMAN360 Well-Known Member

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    I have used those before after doing rebuilds but my major concern is when the engine is getting run hard. I want to be able to save it before it totally lets go.
     
    KICKERMAN360, Mar 19, 2018
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  10. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    my67xr, Mar 19, 2018
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  11. Wozza

    Wozza Active Member

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    Uuuuugh! linux programming :) Ive got a few pi's here (I like to tinker)but Im now looking at the arduino...looks like it is a tad easier to program and has a heap of more add-ons ect.....
     
    Wozza, Mar 19, 2018
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  12. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    I am very rusty on this, but as I recall, cylinder head temp is a very good indicator for two strokes and a stochiometric indicator in the exhaust is better for 4 strokes.
     
    maelstrom, Mar 19, 2018
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  13. KICKERMAN360

    KICKERMAN360 Well-Known Member

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    I have an Arudino and did get it to (roughly) read the RPM signal from the bike. It needed a lot of smoothing which is where my programming skills wore out but it worked for the most part. I did that about 3 years ago. I was thinking of a Pi because the RPM signal processing seems to be pretty crazy and more processing the better. Plus, thought the Pi has a better screen.

    I've done way more reading into 2 strokes, but yes, basically make sure it doesn't seize and it's good to go for 2 strokes. I wouldn't normally be too concerned but I'm just a little paranoid about the NSR engines. Partly because they cost a fortune to fix and also did I say they cost a fortune to fix? haha I'm not too keen to rebuild the engine either, so if I can get some data which says the engine is fine, I'm happy.
     
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    KICKERMAN360, Mar 19, 2018
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