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  #1  
Old 09-05-2012, 12:28 PM
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Location: Metro Detroit, Michigan
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Homemade Polyurethane Engine Mounts - bushings

Each product is different; READ THE Polyurethane DIRECTIONS FIRST...

Failure to FOLLOW the product DIRECTIONS and WARNINGS can cause potentially dangerous issues.


Please note:
Many people find Polyurethane mounts to be harsh.
Racing - extreme sport people love them.
If there are no original equipment mounts, bushings available this is a good option.
Some discontinued plastic parts can also be re-cast in Polyurethane, depending on required hardness and the temperature/environment it will be in.

Stock engine mounts are usually around 40/45 hardness.
Extreme performance engine mounts can vary from 60 - 90 hardness for track racing.

Engine mount interchangeability: Shore Hardness?

Custom urethane engine mounts???

DIY Poly Mounts!

Making polyurethane - YouTube

DIY Homemade Polyurethane Engine Mounts - Honda Forum : Honda and Acura Car Forums

Homemade Motor Mounts

Pouring Resin - DIY Solid poly motor mounts - YouTube

Subaru Fluid Filled Bushing Repair - YouTube

Pouring a bushing - YouTube

Pouring a bushing, part 2 - YouTube

How to make a Urethane Mold - YouTube

DIY homemade urethane transmission mount - MY350Z.COM Forums

http://www.google.com/search?q=Liquid+polyUrethane&rls=com.microsoft:en-us&ie=UTF-8&oe=UTF-8&startIndex=&startPage=1&rlz=

http://www.uscomposites.com/moldmaking.html

RTV Urethane Molding Rubber Kit, 16 oz, 60 Hardness
http://www.ebay.com/itm/RTV-Urethane-Molding-Rubber-Kit-16-oz-60-Hardness-/120601839949?pt=LH_DefaultDomain_0&hash=item1c146e094d



.

Last edited by whunter; 12-17-2012 at 11:16 AM.
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  #2  
Old 12-10-2012, 03:26 AM
whunter's Avatar
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Location: Metro Detroit, Michigan
Posts: 17,353
FYI

I have gutted and re-cast three sets of SDL engine shock mounts over the past two years.

When the owner found out the cost of new shock mounts, they elected to (emergency repair) try Polyurethane Construction Adhesive "Liquid Nails" – No. LN-950.

All I can say at this point is if you clean - prep the parts, follow product directions and allow it to cure, Liquid Nails will work.
Of the six, none have failed yet.

I am experimenting with Urethane of a hardness between 60 and 90, as alternative to the high cost or lack of new rubber parts.

Rubber Hardness Chart

The durometer chart below gives you an idea of rubber hardness by application.

a. Shore 20A = Rubber Band
b. Shore 40A = Pencil Eraser
c. Shore 60A = Car Tire Tread
d. Shore 70A = Running Shoe Sole
e. Shore 80A = Leather Belt
f. Shore 100A = Shopping Cart Wheel

Shore durometer - Wikipedia, the free encyclopedia


.
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Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Prototype Vehicle build.
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  #3  
Old 09-10-2013, 07:13 PM
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Location: SE Mich
Posts: 3,069
Quote:
Originally Posted by whunter View Post
I have gutted and re-cast three sets of SDL engine shock mounts over the past two years.

When the owner found out the cost of new shock mounts, they elected to (emergency repair) try Polyurethane Construction Adhesive "Liquid Nails" No. LN-950.

All I can say at this point is if you clean - prep the parts, follow product directions and allow it to cure, Liquid Nails will work.
Of the six, none have failed yet.

I am experimenting with Urethane of a hardness between 60 and 90, as alternative to the high cost or lack of new rubber parts.

Rubber Hardness Chart

The durometer chart below gives you an idea of rubber hardness by application.

a. Shore 20A = Rubber Band
b. Shore 40A = Pencil Eraser
c. Shore 60A = Car Tire Tread
d. Shore 70A = Running Shoe Sole
e. Shore 80A = Leather Belt
f. Shore 100A = Shopping Cart Wheel

Shore durometer - Wikipedia, the free encyclopedia


.
All my home-made Citroen DS21 motor mounts are made of 75 durometer material. No problems after 4 years
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  #4  
Old 06-28-2016, 02:44 AM
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Join Date: Dec 2003
Location: Metro Detroit, Michigan
Posts: 17,353
Recycled

for members in need.
.
__________________
ASE Master Mechanic
asemastermechanic@juno.com

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Prototype Vehicle build.
Prototype Fleet Durability
Prototype vehicle instrumentation.
Technical Quality Auditor.
Automotive Technical Writer

1973 300D
1973 309D - stolen
1978 280SE
1980 240D
1983 300D
1984 190D
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