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  1. #1
    hkss's Avatar
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    Temperatures in the engine housing?

    have somebody measured the temperatures in the engine housing?
    What do you think is the ambient temperature around the batterie?


  2. #2
    There's been alot if discussion about this. The pooling of hot air at the back of the ski, becoming trapped. Open vents / ducts allowing air in but not out. Frogskinz membrane. Also talk about assisted airflow (mini fan).

    Some guys have wicked custom seat / seat assemblies to channel heat out.

    Lots of debate. Not sure if there's a definative solution or in fact any evidence based findings that the warm air is a problem. There are many CAI trials on the www that show CAI over warm to not affect performance.

    Sure you'll get lots of comments / advice on this very soon, not sure how much real science has been conducted.

  3. #3
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    uuu... sorry seem to me I sit in a vespiary.
    I only try to find a Gel or lithium batterie that are suitable for this temperatures.
    I know may people use gel or lithium batteries - but I like to research in batterie
    maufactors spezifications to ensure the batterie are suitable for this temps.

  4. #4

  5. +1 by:


  6. #5
    Regarding the original question the air in the front is about 10 degrees Fahrenheit over ambient. In the back, it is about 30 over. It is a little tough to measure back there. 2 sec from a dead stop throttle stab, my ski is making about 30 more HP.

    It actually lost about .2 sec idle to 7000 RPM on a throttle stab. The added 2.5" rear vent made no measurable difference. If anything, it appears to let air into the hull, not let hot air out.

    http://www.nbs-stl.com/RxpxTuning/RearAirVent.jpg

    Here is a pic at the blower

    http://www.nbs-stl.com/RxpxTuning/BlowerAdapter.jpg

  7. #6
    Quote Originally Posted by whittlebeast View Post
    Regarding the original question the air in the front is about 10 degrees Fahrenheit over ambient. In the back, it is about 30 over. It is a little tough to measure back there. 2 sec from a dead stop throttle stab, my ski is making about 30 more HP.

    It actually lost about .2 sec idle to 7000 RPM on a throttle stab. The added 2.5" rear vent made no measurable difference. If anything, it appears to let air into the hull, not let hot air out.

    http://www.nbs-stl.com/RxpxTuning/RearAirVent.jpg

    Here is a pic at the blower

    http://www.nbs-stl.com/RxpxTuning/BlowerAdapter.jpg
    Good hard data Andy, I think there's much more going on in the engine bay than we know or even understand.

  8. #7

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    Stuck a temp gauge in my S3 during summer and the temp hovered around 120 degrees.

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  10. #8
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    Perfect work Andy!
    But in the Post #5 you are talking from "degrees Fahrenheit" - is this a misstake?
    You mean degree Celcius I think.

  11. #9
    Degrees F is correct.

    I am talking degrees in the hull. This is not temperature in the intake manifold.

  12. #10
    hkss's Avatar
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    ok - I think I make a mistake in convert to celcius. I am looking what 30 degree F is - and not how much it is.
    But also I am very amazed how less more it is in this housing.
    I think the battery ambient is never over 140 degree F. - You think so?

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