Vmax SHO motor mounts

[jimmybrie]

Hi everyone,

Please let me know if it's not the right place to post for this...

Wondering if anyone has old set of motor mounts or even better the dimensions of the mounts. Are all 4 identical? Thinking about machining a set they seem pretty straight forward. Delrin is not that expensive wondering if it's worth it... some will probably say no...

I would think Delrin is better but some seems to be aluminium, any pros and cons from your experience?

Thank you

[Greg G]

Might want to take a look here at HT first ......

https://www.hydrotecmarine.com/shop/...2a-ny5w8-w684w

[jimmybrie]

Might want to take a look here at HT first ......

https://www.hydrotecmarine.com/shop/...2a-ny5w8-w684w

Yes thank you, I know that MCR sells Delrin and Bob's aluminium also. Was just wondering what's best between Delrin or aluminium (I would tend towards Delrin) and if I could save 200-250$ (considering taxes and shipping - ~ 50$ material) for 1.5 -2h of labor I thought it might worth it. But maybe not since finding the mesurements might be thought. If all 4 are the same I could just remove a lower one and copy though... Was just asking I might just buy them...

Anyone knows if all 4 are identical?

Thank you

[jimmybrie]

Might want to take a look here at HT first ......

https://www.hydrotecmarine.com/shop/...2a-ny5w8-w684w

On the picture it looks like upper and lower are different, will probably simply get a set thanks

[David]

It looks less expensive to buy from MCR than Hydrotec since you live in Quebec. MCR is pretty close to my house, not that it matters.

The Hydrotec description bugs me as they describe the mounts as ‘a high density PVC material called Delvin’. Delvin is a brand name for acetal and it comes in many different grades. Acetal and PVC are different materials.

My vote is to go with plastic as Hydrotec are the Yamaha gurus.

[OnPad]

I've ran both Delrin, and aluminum in Mercs. The Delrin mounts tightened things up, but bounced worse than stock, or aluminum mounts. I didn't care for them, and replaced with aluminum.

[jimmybrie]

It looks less expensive to buy from MCR than Hydrotec since you live in Quebec. MCR is pretty close to my house, not that it matters.

The Hydrotec description bugs me as they describe the mounts as ‘a high density PVC material called Delvin’. Delvin is a brand name for acetal and it comes in many different grades. Acetal and PVC are different materials.

My vote is to go with plastic as Hydrotec are the Yamaha gurus.

Yes prolly cheaper through MCR in Canada, and not that I have something against HT but spoke with James at MCR and he was very kind and helpfull gave me a couple hints so I would rather encourage them.

Was just wondering about making them because I've done it in the past for a Merc 200 before getting the 260 and I was pretty easy and straight forward.

Thank you

[jimmybrie]

I've ran both Delrin, and aluminum in Mercs. The Delrin mounts tightened things up, but bounced worse than stock, or aluminum mounts. I didn't care for them, and replaced with aluminum.

Nice input there wondering why some use Delrin? More bouncing than rubber?

Thank you

[David]

Delrin, in any grade, would be a lot stiffer than rubber, but not as stiff as aluminum.

https://www.delrin.com/

Interesting to me, Dupont sold their acetal business last year to a private equity company. So now Delrin is a company.

[jimmybrie]

Delrin, in any grade, would be a lot stiffer than rubber, but not as stiff as aluminum.

https://www.delrin.com/

Interesting to me, Dupont sold their acetal business last year to a private equity company. So now Delrin is a company.

Yes thank you I'm knew Delrin because I used Acetal when I built/fabricated industrial machines for the food business in the past. Also used it to fabricate control arm bushings for race cars when they weren't available on the market for specific car and we didn't want to run a solid rod end (heim joint) setup. Wasn't aware that there was different stiffness though, I knew about Duro ratings for polyeurethane but not Delrin. Prolly always bought the most common grade. From what I read the grades don't affect the mechanical properties that much but more the hot flowing caracteristics for injection molding.

Yes in my head way stiffer than rubber that's why I was asking about the bouncing...

[David]

The properties of the different Delrin grades vary, but in the normal, non glass filled, not impact modified, grades, the range of stiffness (Young's modulus) doesn't vary much, about 2900 - 3400 MPA. For comparison, an aluminum casting alloy that I am familiar with, A380, has a stiffness of 71,000 MPA. I used to work on mechanisms that used a lot of plastic parts. I liked acetals like Delrin as they are dimensionally stable, and in some cases we needed UV or impact resistance. Natural rubber, which can be used for engine mounts, has a stiffness of 3 MPA. I expect rubber can be modified, like most plastics, but it's not going to get real stiff.

[OnPad]

Nice input there wondering why some use Delrin? More bouncing than rubber?

Thank you

I was under the impression that Delrin would cause less damage to the plates, and mid. Seemed like the way to go.
Don't know if it was unique to my rig that has lots of setback, and not much prop in the water. I ran all three styles on a Bullet one year. The rubber has more movement, but dampened better. The delrin seemed to get a weird recoil/ bounce. Running in a bit of chop, and it looked like it was going to shake apart.

[jimmybrie]

The properties of the different Delrin grades vary, but in the normal, non glass filled, not impact modified, grades, the range of stiffness (Young's modulus) doesn't vary much, about 2900 - 3400 MPA. For comparison, an aluminum casting alloy that I am familiar with, A380, has a stiffness of 71,000 MPA. I used to work on mechanisms that used a lot of plastic parts. I liked acetals like Delrin as they are dimensionally stable, and in some cases we needed UV or impact resistance. Natural rubber, which can be used for engine mounts, has a stiffness of 3 MPA. I expect rubber can be modified, like most plastics, but it's not going to get real stiff.

Nice info thanks

[jimmybrie]

I was under the impression that Delrin would cause less damage to the plates, and mid. Seemed like the way to go.
Don't know if it was unique to my rig that has lots of setback, and not much prop in the water. I ran all three styles on a Bullet one year. The rubber has more movement, but dampened better. The delrin seemed to get a weird recoil/ bounce. Running in a bit of chop, and it looked like it was going to shake apart.

Nice info also thanks, sometimes theory is good but real world testing tells it all... also lots of setback here... (18"). But yes maybe aluminium is harder on the bracket, plate, mid, transom etc... Never had any problems with the 260 but it was lighter...