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Engines and Modifications Get the most out of your motor or just get it running! Discuss engines and modifications in depth.

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Old 09-12-2011, 08:45 PM   #1 (permalink)
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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?
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Old 09-14-2011, 04:12 PM   #2 (permalink)
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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.
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Old 09-15-2011, 07:17 AM   #3 (permalink)
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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.
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Old 09-15-2011, 08:42 PM   #4 (permalink)
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Can you post a few pics? I'll take a look. How big is it?
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Old 09-15-2011, 09:12 PM   #5 (permalink)
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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.
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Old 09-15-2011, 10:21 PM   #6 (permalink)
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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!
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Old 09-15-2011, 11:29 PM   #7 (permalink)
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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.
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Old 09-16-2011, 07:39 PM   #8 (permalink)
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Didn't realize gopro cameras had such wide angle lenses.
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Old 09-17-2011, 01:19 PM   #9 (permalink)
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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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