Aftermarket Engine Mount Problems

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11/4/2019 3:07 PM

Putting too much stress on the motor? Heard some people are having issues.

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11/4/2019 3:11 PM

Shouldn’t make a difference if they were installed correctly

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11/4/2019 3:34 PM

What issues?

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11/4/2019 3:45 PM

If you took strength out the mount, i.e. more flex, shouldn't that put less stress on the engine as a frame strengthening component or brace?

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11/4/2019 4:22 PM

Never heard of her.

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11/4/2019 4:43 PM

Swap Moto's recent video had a...non happy rider from this weekend that had some issues.

I wasn't there and didn't see it so I will not blow anyone else out.

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11/4/2019 5:17 PM

nascarnate326 wrote:

Swap Moto's recent video had a...non happy rider from this weekend that had some issues.

I wasn't there and didn't see it so I will not blow anyone else out.

He also said FCP rushed over and pulled them off of his bike. Not the best look

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11/4/2019 5:36 PM

misterwaterfallin wrote:

He also said FCP rushed over and pulled them off of his bike. Not the best look

Which video is this?

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11/4/2019 5:42 PM

https://www.swapmotolive.com/life-on-two-wheels-editors-vlog-vet-world-championships/

At about 14:45....it was Sleeter who's mounts/bike had issues.

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11/4/2019 5:43 PM

So, perhaps not enough R&D into these things? Like, maybe the engineers at the manufacturers sorted out the stock ones to be a certain stiffness/strength to accommodate the bikes and ensure reliability?

In all honesty I hope the market for aftermarket mounts flourishes (or continues to do so anyway)... It's a cool concept. They still have to do their homework though!

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James

11/4/2019 5:45 PM
Edited Date/Time: 11/4/2019 5:46 PM

I've heard nothing but praise from the Works Chassis lab mounts. If anything I would think more stress would be transferred to the frames not the engine since the mounts usually are "softer" and flex more. Even still I would think these "issues" would take years or high hours to actually show on a normal riders bike if at all. I can see it being a feeling maybe some don't like vs an actual structural issue.

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11/4/2019 6:14 PM

Im sure the mounts are built fine. Probably just a freak accident that's easily explainable. Im sure they would rush over right away. The mount industry isnt very big so best to minimize the negative exposure.

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11/4/2019 6:34 PM
Edited Date/Time: 11/4/2019 6:35 PM

Love my WCL mounts for all my Kawis. All my buddies have them for Honda’s too, prolly 12 guys and they love them! I know making sure they are torqued properly with a good torque wrench is important and the sequence in which they are torqued is as well.

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11/4/2019 6:35 PM
Edited Date/Time: 11/4/2019 6:36 PM

Keep in mind the FCP and WCL are not the same......

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11/4/2019 7:10 PM

MOTO120 wrote:

https://www.swapmotolive.com/life-on-two-wheels-editors-vlog-vet-world-championships/

At about 14:45....it was Sleeter who's mounts/bike had issues.



Both brands. Interesting. Him too? "Stock is best!"
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11/4/2019 8:33 PM

He's saying that the mounts put too much stress on the motor and he had a problem. What the problem actually was wasn't really discussed, so hard to say what's really going on.

In general, if the mounts are "softer" than stock, e.g. more flexy, then they shouldn't put any more stress on the engine than stock. They would likely increase the stress in the frame, though, and in the mounts themselves. Realistically, I doubt that the increased stresses would be worth worrying about one way or another in the frame or in the motor, so long as everything is properly installed. But I could see an engine mount breaking if it were a bad design. Being that these mounts are typically designed to add more flex and that the uppers are aluminum, I could see a fatigue issue occurring if the design isn't well vetted.

Regardless, it's hard to say without knowing the whole story. But this is Vital, so let the speculation begin! laughing

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Billy Wight
Luxon MX
@LuxonMX
https://luxonmx.com
Precision Engineered Motocross Components

11/5/2019 4:26 AM

Stock is best

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11/5/2019 4:47 AM

Luxon MX wrote:

He's saying that the mounts put too much stress on the motor and he had a problem. What the problem actually was wasn't really discussed, so hard to say what's really going on.

In general, if the mounts are "softer" than stock, e.g. more flexy, then they shouldn't put any more stress on the engine than stock. They would likely increase the stress in the frame, though, and in the mounts themselves. Realistically, I doubt that the increased stresses would be worth worrying about one way or another in the frame or in the motor, so long as everything is properly installed. But I could see an engine mount breaking if it were a bad design. Being that these mounts are typically designed to add more flex and that the uppers are aluminum, I could see a fatigue issue occurring if the design isn't well vetted.

Regardless, it's hard to say without knowing the whole story. But this is Vital, so let the speculation begin! laughing

If they allow more flex then theres more torsion on the motor itself causing it to break.

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11/5/2019 5:25 AM

kb228 wrote:

If they allow more flex then theres more torsion on the motor itself causing it to break.

I’m not an expert in this field but my thoughts are the oppposite way around.

More flex in the mounts = less forces on the motor.

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11/5/2019 5:47 AM
Edited Date/Time: 11/5/2019 5:48 AM

Thisusernameisavailable wrote:

I’m not an expert in this field but my thoughts are the oppposite way around.

More flex in the mounts = less forces on the motor.

But perhaps more deflection in the direction of those forces at the bolt holes, which could be critical. The acting force could also be engine vibration, not chassis flex, in which case, a more flexible mount would increase the dynamic loads on the mounting points.

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11/5/2019 6:39 AM

kb228 wrote:

If they allow more flex then theres more torsion on the motor itself causing it to break.

Thisusernameisavailable wrote:

I’m not an expert in this field but my thoughts are the oppposite way around.

More flex in the mounts = less forces on the motor.

Dirty Points wrote:

But perhaps more deflection in the direction of those forces at the bolt holes, which could be critical. The acting force could also be engine vibration, not chassis flex, in which case, a more flexible mount would increase the dynamic loads on the mounting points.

Are you an expert in this field? Or is this hypothesis like me? (honest question)

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11/5/2019 6:40 AM
Edited Date/Time: 11/5/2019 7:45 AM

Thisusernameisavailable wrote:

I’m not an expert in this field but my thoughts are the oppposite way around.

More flex in the mounts = less forces on the motor.

Dirty Points wrote:

But perhaps more deflection in the direction of those forces at the bolt holes, which could be critical. The acting force could also be engine vibration, not chassis flex, in which case, a more flexible mount would increase the dynamic loads on the mounting points.

Thisusernameisavailable wrote:

Are you an expert in this field? Or is this hypothesis like me? (honest question)

Completely hypothetical. I have no idea what broke, or if anything did even break.

I am just counterpointing the assertion that more flex means less material stress in a dynamic situation - see the Tacoma narrows bridge as the textbook example. We also know that shear strength for the materials we are talking about (steel/aluminum) is a fraction of tensile strength, so the direction of force on a bolt hole can be just as critical as the amount of force.

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11/5/2019 7:08 AM

I personally would leave that shit alone and focus on changes that have a more direct impact on rider feedback. Engine mounts are the CBD of the motocross world (just kidding....i know CBD helps certain issues including sleep/ anxiety)

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11/5/2019 7:17 AM
Edited Date/Time: 11/5/2019 7:18 AM

"Bike let go going up Mt. St Helens"

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11/5/2019 7:54 AM

At least now we can rule out the placebo effect. The mounts do make a difference. It just might be detrimental to the bike?

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11/5/2019 8:24 AM

Dirty Points wrote:

But perhaps more deflection in the direction of those forces at the bolt holes, which could be critical. The acting force could also be engine vibration, not chassis flex, in which case, a more flexible mount would increase the dynamic loads on the mounting points.

Thisusernameisavailable wrote:

Are you an expert in this field? Or is this hypothesis like me? (honest question)

Dirty Points wrote:

Completely hypothetical. I have no idea what broke, or if anything did even break.

I am just counterpointing the assertion that more flex means less material stress in a dynamic situation - see the Tacoma narrows bridge as the textbook example. We also know that shear strength for the materials we are talking about (steel/aluminum) is a fraction of tensile strength, so the direction of force on a bolt hole can be just as critical as the amount of force.

I agree with you on your hypothetical conclusion. "a more flexible mount would increase the dynamic loads on the mounting points."

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11/5/2019 8:58 AM

Moto520 wrote:

I personally would leave that shit alone and focus on changes that have a more direct impact on rider feedback. Engine mounts are the CBD of the motocross world (just kidding....i know CBD helps certain issues including sleep/ anxiety)

Like a gym membership?!silly grin silly grin tongue

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11/5/2019 9:35 AM
Edited Date/Time: 11/5/2019 9:38 AM

Moto520 wrote:

I personally would leave that shit alone and focus on changes that have a more direct impact on rider feedback. Engine mounts are the CBD of the motocross world (just kidding....i know CBD helps certain issues including sleep/ anxiety)

Thisusernameisavailable wrote:

Like a gym membership?!silly grin silly grin tongue

Yeah....and a new tire. I mean....come on....an engine mount? I call bullshit on anyone that feels a MEASUREABLE advantage. Placebo effect? Yes. Sorry guys.

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11/5/2019 10:09 AM

Moto520 wrote:

I personally would leave that shit alone and focus on changes that have a more direct impact on rider feedback. Engine mounts are the CBD of the motocross world (just kidding....i know CBD helps certain issues including sleep/ anxiety)

Thisusernameisavailable wrote:

Like a gym membership?!silly grin silly grin tongue

Moto520 wrote:

Yeah....and a new tire. I mean....come on....an engine mount? I call bullshit on anyone that feels a MEASUREABLE advantage. Placebo effect? Yes. Sorry guys.

You know good test riders arent told about changes made to the bike and are able to tell the team the difference

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11/5/2019 12:13 PM

Thisusernameisavailable wrote:

Are you an expert in this field? Or is this hypothesis like me? (honest question)

Dirty Points wrote:

Completely hypothetical. I have no idea what broke, or if anything did even break.

I am just counterpointing the assertion that more flex means less material stress in a dynamic situation - see the Tacoma narrows bridge as the textbook example. We also know that shear strength for the materials we are talking about (steel/aluminum) is a fraction of tensile strength, so the direction of force on a bolt hole can be just as critical as the amount of force.

ridinbeast932 wrote:

I agree with you on your hypothetical conclusion. "a more flexible mount would increase the dynamic loads on the mounting points."

Not only that. rear tire and chain is fixed, aligned. An engine that twists to much is not good for drive train.

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