Why do cars have rubber engine mounts, but bikes do not?
Answers:
If rubber engine mounts were fitted to a modern motorbike it would ride like a donkey!
The engine is a part of the structure/frame of most modern bikes, it helps keep the bike tight and balanced which allows the extreme lean angles and quick steering input that a modern bike can achieve.
A cars rubbers mounts are only there to supress the noise and vibration of the engine for comfort.
noise suppresion?
It's probably a weight issue.
some bikes do, particularly older british ones, Nortons had them for example, so did Sunbeams in the late 40s. Bikes engines are often a structural part of the frame and need the rigidity that would be lost with a rubber mount
Cars have them to smooth out the vibration from the engine. This generally can't be done with bikes, as the engine is very often an integral part of the chassis' rigidity, and using rubber mounts would detract from that rigidity, thereby leaving you with a bendy bike!
you want to feel the engine that's why you sit on the engine on bike .. whereas car is for comfort .. therefore less vibration desired ..
Also most modern bikes have balancer shafts fitted to reduce engine vibrations and so can do without rubber mounts
Modern motorbikes tend to use the engine as a stressed member, ie part of the frame. This reduces overall weight of the bike and vibration is deal with by rubber mounted footpegs and handlebars. Vibration adds to the experience of bike riding too.
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