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  1. #1
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    97cc DB30 vs. HF 79cc OHV

    Basically, I've built a small gokart that I've put a swapped out baja engine on. I've also got one of those small Harbor Fright 2.5hp engines around which I'm thinking possibly be a bit stronger despite being lower displacement. Before I spend a couple of hours swapping engines and potentially another couple swapping back if I'm not impressed, any impressions on which might be a bit better?

  2. #2
    Senior Member mr.modified's Avatar
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    When your dealing with such small displacement engines to begin with, 18cc is a lot. I would think the 97cc would be a bit better. Either way, that go kart could probably get beat by a power wheels battery powered barbie jeep. Not giving you a hard time, just figured I'd say it before someone else did. On a more serious note, I wouldn't bother changing anything around just to swap to an engine that is about the same power.

  3. #3
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    I think you'd be surprised. For such a laughable engine, with a featherweight frame it can actually move pretty well once it gets going.

  4. #4
    Senior Member mr.modified's Avatar
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    Can you post a few pics? I'll take a look. How big is it?

  5. #5
    Growing up is optional Neck's Avatar
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    I had a 125cc (3hp) Briggs Flat head on my daughters Go Kart when I built it, it would go pretty fast (and dare I say it, it had no governor!) but it was slow getting up to speed. The predator for the simple fact of being a overhead valve engine gives it the edge over the 97cc DB 30 engine even if it gives up a few cc's to the flat head. Bottom line is RPM's will give you top speed, bigger displacement will give you acceleration.
    Its the members that make OMB, a great place!

  6. #6
    Senior Member Motra's Avatar
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    Quote Originally Posted by mr.modified View Post
    Either way, that go kart could probably get beat by a power wheels battery powered barbie jeep.
    Now that cracked me up!

  7. #7
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    Quote Originally Posted by mr.modified View Post
    Can you post a few pics? I'll take a look. How big is it?


    I'll get some pictures tomorrow, since I've taken the video I redid the back end, replaced the bent axle, and a few other things.

  8. #8
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    Didn't realize gopro cameras had such wide angle lenses.

  9. #9
    Senior Member mr.modified's Avatar
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    Interesting little machine. Maybe make a place to put your feet out of some light weight aluminum diamond plate.

 

 

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