IDONTBELEIVEIT
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| posted on 25/1/08 at 10:32 PM |
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rubber engine mounts
hi,are bike engines rubber mounted in anyway in the car chassis,looks from some photos i've seen that maybe a bit like metalistic suspension
bushes,cheers wayno!!
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bigrich
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| posted on 25/1/08 at 10:37 PM |
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depends on the manufacturer as to wether it is solidly mounted to the chassis or poly bushed between cradle and chassis, no right or wrong way
Rich
mines poly bushed BTW
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A pint for the gent and a white wine/fruit based drink for the lady. Those are the rules
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BenB
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| posted on 26/1/08 at 09:15 AM |
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As recently discussed my ST1100 is attached to the engine cradle via polybushes and then the cradle is attached to the chassis via RS2000 engine
rubbers.
The ST1100 is a heavy torque old engine so it's probably sensible. Usually BECs are just polybushed....
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BenB
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| posted on 26/1/08 at 09:15 AM |
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Those RS2000 engine rubbers are quite heavy BTW!! The two weight about 1kg!!
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RazMan
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| posted on 26/1/08 at 10:23 AM |
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I used Landrover engine bobbins - really stiff so they limit movement more than most.
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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foes
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| posted on 26/1/08 at 11:09 AM |
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The 05 r1 in my stuart taylor chassis is mounted solid, no rubbers or bushes.
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ChrisGamlin
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| posted on 26/1/08 at 04:07 PM |
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If you're using a gear linkage (as opposed to a cable) then you really want to mount the engine quite solidly otherwise you could start getting
imprecise gearchanges with the engine moving around under acceleration etc, which can lead to all sorts of nasties happening in the gearbox.
My blade engine was partially solidly mounted with a couple of poly bushes as well, the R1 is completely solid.
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RazMan
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| posted on 26/1/08 at 05:14 PM |
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Isn't that really noisy? I would have thought you need at least a little bit of isolation or the vibes will be horrible.
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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ChrisGamlin
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| posted on 26/1/08 at 07:49 PM |
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Makes bu**er all difference, all BECs vibrate like mad regardless! 
If you think about it though, most are solidly mounted in the bike to become a stressed member of the frame, and the bikes don't suffer from
excessive vibrations.
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Minicooper
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| posted on 26/1/08 at 08:20 PM |
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Bikes are alloy frames which don't transmit vibrations like steel does and also the seat, footpegs, handlebars etc are isolated, if you rubber
mount the engine then you must also rubber mount everything else as any solid connection will make it sound like a bag of hammers
Cheers
David
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ChrisGamlin
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| posted on 26/1/08 at 09:06 PM |
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Ive not ridden a blade/R1 bike to compare directly, but a bike is a lot lighter and the rider sits a lot closer to the engine with their body touching
parts such as the tank and side panels which aren't really isolated, so I'd be suprised if you felt engine vibration significantly less on
the bike than in a car.
What I can confirm though is that having had my engine solidly mounted for 3 years or so, despite having bare GRP seats and bare ally panels I
haven't found the vibrations to be a problem at all, you don't feel the vibrations when driving, nothing shakes loose, nothing has broken
from vibration fatigue and its not noticably different to other BECs Ive driven / been in that might have used rubber mounting.
cheers
Chris
[Edited on 26/1/08 by ChrisGamlin]
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lsdweb
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| posted on 27/1/08 at 12:19 PM |
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I'm with Chris. Solid. No question about it! It's solid mounted in the bike and, as Chris said, you have distance to separate you from any
vibrations, although mine is right behind me!
Wyn
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