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Post by benhonda on Dec 15, 2019 17:19:49 GMT -5
I know the plastic that wraps around the engine is to direct airflow from the fan on the side I figure that was needed because the body panels block any direct airflow I will be doing a 80cc bbk on my bike soon, and my bike has been made into a sort of mini bike, so no body panels So I would think that the engine would stay cool without the plastic cover. Anyone on here run without the cover on?
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Post by Zino on Dec 15, 2019 17:36:10 GMT -5
These engines are designed for forced air cooling that is why you have the shrouds and the small fins .
Engines that are passively air cooled have bigger fins to draw the heat from the engine .
If you run without shrouds You will over heat it is just matter of time .
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Post by GrumpyUnk on Dec 16, 2019 9:03:51 GMT -5
To repeat what zino18 stated, the shrouds are necessary if you don't want your cylinder walls scored and your piston rings to lose their tension. I bought an almost new Taotao from someone who had someone else install a BBK. The installer apparently thought shrouds were for sissies, and left it off. The engine had no compression, and could not be started, so I got it for a ridiculous price. The cylinder walls had slight scoring, but it must have been enough along with the ring damage and melted lands on the piston, add in the parts that had melted off the piston, and you get the idea. The top ring was so stuck I could not get it out of the groove. As I remember, the bottom surface of the cylinder had had to be flattened to seal properly. I went through 3-4 sheets of sandpaper(move the head on a very flat surface, and you can do it at home) to get the head surface flat so it would seal.
I ended up ordering a full set of shroud plastics and it all worked out, but it proved their need to my mind.
tom
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Post by christopher on Dec 17, 2019 6:13:32 GMT -5
Get a cylinder head temperature gauge and measure temperature. less than 350*F is ideal.
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donaldsonta
Scoot Member
Posts: 30 
Location: Columbus, Ohio
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Post by donaldsonta on Dec 17, 2019 7:24:33 GMT -5
I've thought about rigging up one to run ethanol and leaving it naked, but i wouldn't do it with gas.
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Post by benhonda on Dec 17, 2019 21:09:57 GMT -5
Thanks for the info, I had not removed the cover yet so I didn't consider that the fins would be much smaller than on most air cooled bikes. I had figured the cover was because of all the body work would block the normal airflow. I should have the BBK just after xmass, so hopefully will have time to install. I have another scooter based project I'm also working on:  |
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