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    Re: rotax 503 cooling question
    #11
    Junior Member
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    Fl503 looks nice...didnt you sell that?

    I did some playing with the 503 this weekend, with the shroud on the air moving across the engine is insane, if that doesnt keep it cool I dont think anything will. *I ran it for about 15mins and when I shut it off the heads were just warm...I could put my hand on them no problem.
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    Re: rotax 503 cooling question
    #12
    BANNED renegadespec1's Avatar
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    Rushcity Mn.
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    [smilie=ninja.gif]
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    Re: rotax 503 cooling question
    #13
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    What did you do to the shrouding? I'm using a 503.
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    Re: rotax 503 cooling question
    #14
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    Only thing I did was remove the rubber boots around the spark plugs and only reason I did that was because I replaced the plugs and forgot where I sat them. *I think what you have to remember is that on a snowmobile its recirculating the air over and over so ambient temp under the hood has to be 90+. *In a buggy you'll be pulling in fresh air and venting the "used" air out. * What I realy like about the fan cooled engine is it pulls the air from the side so the seat doesnt block anything.
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    Re: rotax 503 cooling question
    #15
    Senior Member
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    Ak pilot, Is your engine the same one opsled has for sale, From a ski doo?
    It would be ok for my challenger but no RER.
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    Re: rotax 503 cooling question
    #16
    Senior Member Akpilot's Avatar
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    Sorry Lee, I just saw your post. *Yes it is the same type of engine as my Odyssey. *Not sure what year engine Opsled engine is but mine is a '92 from a Skandic snowmobile.

    Wayne
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    Re: rotax 503 cooling question
    #17
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    Jesus Christ I hate bad user interfaces. I just typed in my response and hit the Post Reply button above, but that is to start a NEW reply, not post the Quick Reply, so I lost it all.... jesus people... Anyway, old thread resurrected.

    Short version: anyone have any insights into cooling modifications for the 503? Seat clearance in an FL350 is a big issue with this engine.

    Ha, and just realized my sig still has the ZX6R info in it. That got put on hold so need to update....
    Mini buggy construction

    FL350 rustbucket Rotax 503 conversion

    Custom buggy on hold.
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    Re: rotax 503 cooling question
    #18
    Millenium Member
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    Lansing, MI
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    I would just fab something along the lines of the FL350 air directors, but bigger. A popular mod for the 350 was to add a fan, so you could force some air into the scoops to suit your application.
    I race, therefore I am
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    Re: rotax 503 cooling question
    #19
    Senior Member darwinpayne2000's Avatar
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    American Fork, UT 90 minutes from the sand
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    Let us know how it works out for you. I'm curious because my Briggs and Stratton industrial engine is fan-cooled and I've run the snot out of it for 10+ years and it's still going strong. No oil cooler either.

    The conventional wisdom has always been to use a liquid cooled snowmobile engine, but older fan-cooled snowmobiles are dirt cheap in my area and I've always been tempted to build a light-weight buggy around a fan-cooled engine.
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    Re: rotax 503 cooling question
    #20
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    Upper Peninsula, MI
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    My two seater uses a 90s 440 fan cooled snowmobile engine, and it weighs less than 650 without a driver or passenger. Haven't had any overheating problems, even in summer. The way I see it, the liquid cooled engines are more hopped up, which is why they have to be liquid cooled, so they might be harder to keep cool in the summer. Just my $.02
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