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Mounting Techniques for Bicycle Motors Every frame is different. Share and ask questions about mounting your engine kit to your frame or rack

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  #11  
Old 07-01-2014, 10:39 AM
Toothy Toothy is offline
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Default Re: Still want to argue about rubber mounting?

Whats the story behind the pic? Apart from using rubber of course.
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  #12  
Old 07-01-2014, 10:44 AM
crassius crassius is offline
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Default Re: Still want to argue about rubber mounting?

Yep, that's what happens - seen it with bare metal mounts too, so always put a piece of PVC or hard leather there.

Fixable tho with an old seat post to fit inside, then put bolts thru at top & bottom
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  #13  
Old 07-01-2014, 10:55 AM
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Default Re: Still want to argue about rubber mounting?

Rubber mounts are just like having an Oscillating (vibrating)saw between your legs

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  #14  
Old 07-01-2014, 11:18 AM
JOBAfunky JOBAfunky is offline
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Default Re: Still want to argue about rubber mounting?

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Originally Posted by crassius View Post
Yep, that's what happens - seen it with bare metal mounts too, so always put a piece of PVC or hard leather there.

Fixable tho with an old seat post to fit inside, then put bolts thru at top & bottom
Ya I ended up using leather on mine and it seems to be working all right. What about those 1 inch thick purpose made rubber mounts? Anybody ever try using those?
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  #15  
Old 07-01-2014, 01:54 PM
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Default Re: Still want to argue about rubber mounting?

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Originally Posted by JOBAfunky View Post
Ya I ended up using leather on mine and it seems to be working all right. What about those 1 inch thick purpose made rubber mounts? Anybody ever try using those?
NO RUBBER is what we're saying. I know there is at least one engine vendor who is selling rubber mounts. He should be ashamed of himself. And he should read this thread.

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  #16  
Old 07-01-2014, 02:31 PM
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Wink Re: Still want to argue about rubber mounting?

Sorry to say but I can't agree entirely with this, the reason being is I use a very thin plastic (not like PVC) or urethane between certain engine mounts and tighten it down to where it's less than .005" thick and have no problems.

I won't get into telling you why I do this, but it works for me.

You don't want a cushy type rubber of any thickness type mount for sure, when it comes to mounting your engine to a bicycle frame.
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  #17  
Old 07-01-2014, 04:37 PM
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Default Re: Still want to argue about rubber mounting?

I'm not buying it either. the Atomic BB is 3 1/2 years old, over 2000 miles, and 2 engines, plus alloy frame.

Plenty of frames break when the motor is solid mounted too. The problem is not the rubber, it's poor engineering on the builders part.

Front motor mount is a rubber hockey puck. I made 3 other bikes with the same front mount and none of them have had any problems from it.

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  #18  
Old 07-01-2014, 07:11 PM
crassius crassius is offline
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Default Re: Still want to argue about rubber mounting?

most rubber will dissolve a bit after being exposed to fuel, and most rubber is easily cut through by vibrating metal - that said, there *may* be a kind that will work, but why bother taking the chance
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  #19  
Old 07-01-2014, 07:46 PM
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Default Re: Still want to argue about rubber mounting?

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Originally Posted by wret View Post
Maniac, can you enlighten me? What is it about using a dampening material that is causing the failure? Is it just due to way its being used inhibiting the the stability of the mount?
The problem is any movement AT ALL in a mount concentrates all the vibration on whatever is moving, be it a standard ubolt or any type of clamp.
This forces the bolts or clamp to absorb and transfer ALL the movement.
The PROPER way is a ROCK SOLID mount which distributes the vibration from the engine out into the frame where the tubing and triangulation spreads all the movement and absorbs it.
Allowing the mount to move forces ALL the movement to one point where bad things happen.
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  #20  
Old 07-01-2014, 07:52 PM
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Default Re: Still want to argue about rubber mounting?

Quote:
Originally Posted by Toothy View Post
Whats the story behind the pic? Apart from using rubber of course.
They story is there was no rubber in this bike. It was pure vibration and poor huffy tubing.
I can see the wear on the seat tube where the vibration had been sawing away at the tube, as well as the flattened and distorted down tube. This was caused by a poor fitting, loose motor allowed to move FAR too long.
While this failure was not rubber related, Rubber simply makes this happen faster by concentrating all the vibes on the mount.
Don't bother ranting about how rubber works and your bike is proof guys...You know who you are, and this is not meant for builders like you guys anyway.
It's meant for people still learning.
Experienced builders use rubber mounting properly IF they use it at all..
My point is that for 99.99999% of the bikes out there, and ALL the newcomers to the hobby, rubber is a BAD IDEA.
Just my opinion.
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Last edited by maniac57; 07-01-2014 at 07:55 PM.
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