Johneturbo
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posted on 18/10/10 at 02:34 PM |
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Soft mounting a bike engine
I've been looking at the idea of using polyurethane bushes to mount the engine rather than hard mouting it
looks like i can't go with my original idea of using 3 3/4 outter bushing shell as i wont have the room between engine and mounts
so i thought about maybe just using a Polyurethane bush between the engine and mount something like these
http://www.superflex.co.uk/proddetail.php?prod=SF394-0669
worth a try you think?
![](/images//smilies/smile.gif)
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matt_gsxr
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posted on 18/10/10 at 02:38 PM |
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Do you think that those are soft enough?
The ones on a bike are rubber (well the ones on my gsxr1100, but that is a dinosaur so maybe things have moved on).
Those ones don't look like they would have much give in them. Happy to be proved wrong though.
Matt
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jossey
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posted on 18/10/10 at 02:44 PM |
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whats the benefit of soft mounting a bike engine?
aint most of them hard mounted on bikes?
wouldnt it effect the prop movement in a negative manor?
i have seen a few posts recently on this and im confused on the reasoning of it?
dave
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Johneturbo
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posted on 18/10/10 at 02:48 PM |
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Yea most bikes are hard mounted as the engine is part of the rigidity i guess plus the two spockets need to stay alined.
the reason for me doing it was to take away any vibrations. it can't be a bad thing can it
i'm open to anything else that might be worth a try instead
Dave, the engine woulnd't be able to move it's just a idea of absorbing any vibrations
ETA i know Andy from AB performance talked about metalastic so it has been done before
[Edited on 18/10/10 by Johneturbo]
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coyoteboy
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posted on 18/10/10 at 03:07 PM |
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If you're using shafts with end play, or a soft-mounted diff, soft mounting the engine may have no problems related. If you're chain
driven and you move relative to the other sprocket it could obviusly cause major problems. I made my own poly mounts for my cars diff when it fell
apart, cost me about £30 for a litre of mix and I had to prep the metal well, but it is still holding up. That way you could make your own bushes to
the size/shape/hardness you need.
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adithorp
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posted on 18/10/10 at 03:07 PM |
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My R1 is mounted on "metalastic" bushes. No movement to speak of ut absorbs vibration. 'll see if I've any photo's when
I get home.
adrian
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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Johneturbo
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posted on 18/10/10 at 03:40 PM |
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coyoteboy, the prop does have some end float, but the engine won't have any movement like say a car engine is mounted
i'll only have something in between just to adsorb any vibs.
adrian that would be great.
![](/images//smilies/smile.gif)
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mackei23b
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posted on 18/10/10 at 04:16 PM |
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The Westfields are mouted on bushes.
Cheers
Ian
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jacko
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posted on 18/10/10 at 04:51 PM |
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What about something like this photo out of Wadders archive + more to see
![](/galpreviews/top_engine_mount.jpg) ![top engine mount](/gallery/top_engine_mount.jpg) top engine mount
Jacko
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g.gilo
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posted on 18/10/10 at 06:14 PM |
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ANTI VIBE
MY BLADE ENGINE HANGS FROM 8 METALASTIC BUSHES, NO DETECABLE MOVMENT BUT VERY SMOOTH AND VIBE FREE.
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adithorp
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posted on 18/10/10 at 06:33 PM |
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Sorry, can't find any pictures of the mounts.
adrian
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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mangogrooveworkshop
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posted on 18/10/10 at 07:59 PM |
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I was just looking at upgrading the bec with this system. The vibrations are killing cans.
My idea is to retrofit the seven with the bushes
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bi22le
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posted on 18/10/10 at 08:24 PM |
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IIRC MAC1 and other BEC manufacturers sometimes use a engine cage or cradle. These are normally rubber mounted. Could you not try doing that?
Or am I missing the point?
IF its just an exact bush size you need then take a photo and post it up. I bet somebody will be able to offer a solution.
Track days ARE the best thing since sliced bread, until I get a supercharger that is!
Please read my ring story:
http://www.locostbuilders.co.uk/forum/13/viewthread.php?tid=139152&page=1
Me doing a sub 56sec lap around Brands Indy. I need a geo set up! http://www.youtube.com/watch?v=EHksfvIGB3I
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Johneturbo
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posted on 18/10/10 at 09:46 PM |
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I was going to go for these
http://www.energysuspensionparts.com/proddetail.asp?prod=9.9107
but on one of my lower mounts on the right there isn't enough room between the mounting point on the engine and the casing itself
![](/galpreviews/lower engine mounts.jpg) ![Description](/gallery/lower engine mounts.jpg) Description
as the 2" long bushings need 3 3/4 OD rather chunky, most other bushings arn't that long i'd want it to be atleast 2" for
strength
so maybe just something that would sandwich between might be a option
i do have a cradle but that is only 2 of the 6 mounts
i'll take a gander at Wadders archive
[Edited on 18/10/10 by Johneturbo]
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Johneturbo
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posted on 18/10/10 at 09:53 PM |
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I'd like to know what that is between cradle/frame
is that metalastik?
hope wadders doesn't mind me posting the pic
![](/galpreviews/brkt_2_closeup.jpg) ![engine brkt 2](/gallery/brkt_2_closeup.jpg) engine brkt 2
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