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Old 03-06-2010, 08:47 PM
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2door 2door is offline
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Location: Littleton, Colorado
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Default Re: Why are the engines called 66cc/80cc need info

The difference between 66 & 80 cc depends on who your are. The Chinese, who manufacture these engines calculate cubic centemeters, or displacement, differently that we do. It is thought that they include the combustion chamber in their measurements which differs from what the rest of the world does. We measure displacement by measureing the bore of the cylinder and the stroke of the piston. The reason given by many kit suppliers as to why they use the 80cc designation is that the search engines on the Internet are set up to look for that figure. Even though there are no true 80cc engines. Most people, when they start to search for available bicycle engine kits look for the biggest motor they can find and 80cc pops up when the search. Most reputable suppliers will explain the difference on their websites.
I hope this answers your question.
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Last edited by 2door; 03-06-2010 at 09:04 PM.
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