Motor Mounts

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Motor Mounts

Postby SunbirdMan » Tue Jun 27, 2006 11:55 am

Several years ago I reported on the Yahoo! Club how I made my own polyurethane motor mounts. To get this forum started I'll post the method here.
I burned the rubber out of a sagging set of V8 mounts.( I lived in a rural area at the time and tossed them on a burn pile). I built a triangle jig from 2x4s with two 45 degree corners and one 90 degree. I bolted the two halves of each mount to the 45 corners to suspend them in the stock position and used duct tape to dam up the backside.
The polyurethane I purchased online from Smooth On. It is a two part mix that was more than enough for 4 motor mounts which cost around $30. I mixed it up and poured it in the open end of the mounts.
OK, it didn't quite go according to plan. The mix is the consistancy of honey and the duct tape didn't seal as well as I thought it would. It started leaking out the bottom of one mount. I had on rubber gloves as instructed so I held the gap closed for about an hour until it setup enough to walk away.
The bottom piece of the stock mount is not a precisely manufactured part. They seem to vary from one to the other so alignment isn't so easy. Kinda eyeballed it. This first set I made ended up sitting lower than expected so I shimmed them. I haven't put many miles on them but they have been on the car for around 4 years and look the same as when I put them in. When I rev the 140hp motor I measure less than 1/4 " deflection at the air cleaner stud.
So, after I replaced my old mounts with the new I did the same thing with the second set. This time I moved them further out of the 45 degree corner to give them more height. I did a better job of taping but still had seepage. Haven't installed them in anything yet. I consider this a success and is cheaper than replacement mounts

Roger
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Postby AusRs » Wed Jun 28, 2006 9:50 am

sounds like a great idea
here in Aus i have a poly manufacturer 10 mins down the road
they are going to re do my engine mounts for me using the same method you have used :)
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Truck mount guide from AWB503

Postby DjTy » Sat Jul 01, 2006 11:58 pm

I got a good advice from someone at v8monza, let me find it: Click here!

props to AWB503 (Thomas) from v8monza!!!!

Anyone with tips and Ideas, Please contribute to this thread!!
-Chevy Monza '76 2+2 V8 262ci (old) -> 355ci (oil problem) -> 355ci (piston broke) -> 350ci (current) ... LOL
-Opel Kadett E 1985 1.2Litre (Back up, had a broken condensor :P still need to find replacement accelerator pump membrane...)

My Monza in Cardomain!
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Postby HI WINDING MONZA » Tue Jul 10, 2007 7:11 pm

Roger , I want to try this on my S10 Mounts, ( they look like large bushings ) I checked the site www.smoothon.com .Which kind of urethane and hardness ( 10A- 50A ) did you use? Did you use a release agent? Doug in Az 8)
My Old Cadillac Powered Monza Still Lives...........now on its 5th owner!..........Somewhere ?

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1992 Pontiac Sunbird Coupe 2.0 OHC MPFI I4 TH125C 147k miles
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Re: Motor Mounts

Postby spyder_xlch » Tue Jul 10, 2007 7:45 pm

SunbirdMan wrote:I held the gap closed for about an hour until it setup enough to walk away.

That's dedication
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Postby HI WINDING MONZA » Thu Jul 12, 2007 6:24 pm

Roger ( aka Sunbirdman ) ?
My Old Cadillac Powered Monza Still Lives...........now on its 5th owner!..........Somewhere ?

The 90's just keep rollin' along........
1990 Chevrolet Silverado Regular Cab Long Bed 350 TBI V8 700R4 106K miles
1992 Pontiac Sunbird Coupe 2.0 OHC MPFI I4 TH125C 147k miles
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Postby SunbirdMan » Sat Jul 14, 2007 12:19 am

Doug,
Sorry, havn't checked this forum lately. I used shore 80A. I think it was pmc-780 Dry. I wanted it as stiff as I could get and still absorb vibration, but I wasn't familiar enough with it. Check this page. Its kind of vague but it puts tire tread between 65-75. Skateboard wheel 85-95. But 10-50 is pretty soft.

http://www.freemansupply.com/techlibrar ... rdness.htm

You might be able to email Energy Suspension and ask the what hardness their mounts use. I didn't use a release agent. The only thing to release was the duct tape and it came off once it set up.
Doing the s10 mounts would be a little tricky setting up a jig to hold everything in place and then pour in the urethane.
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Postby HI WINDING MONZA » Sat Jul 14, 2007 12:59 am

Thanks Roger :D Doug in AZ 8)
My Old Cadillac Powered Monza Still Lives...........now on its 5th owner!..........Somewhere ?

The 90's just keep rollin' along........
1990 Chevrolet Silverado Regular Cab Long Bed 350 TBI V8 700R4 106K miles
1992 Pontiac Sunbird Coupe 2.0 OHC MPFI I4 TH125C 147k miles
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Postby SunbirdMan » Sun Aug 19, 2007 12:13 am

I took some pics today of my extra set (not for sale).
Attachments
polymount001.jpg
polymount001.jpg (207.93 KiB) Viewed 1487 times
polymount002.jpg
polymount002.jpg (169.96 KiB) Viewed 1490 times
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Postby MIKESMONZA » Sun Aug 19, 2007 9:17 am

Those look fantastic,,,,, I been looking at this post for a long time,,,it seem's to get more people interesed in the process glad it has new picturer's with the finished product.Mike
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Re: Motor Mounts

Postby BillPappy » Thu Oct 16, 2008 6:56 am

This spamer did something good. I never seen this post about mounts tell now....
It's hard for an old street racer to stay on the safe side of stupid

Pappy
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Re: Motor Mounts

Postby SunbirdMan » Thu Oct 16, 2008 10:56 am

Spammer? Sorry, they're not for sale.
Roger---------------------------------------------------------------
UNLESS OTHERWISE SPECIFIED
DIMENSIONS ARE IN INCHES
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Re: Motor Mounts

Postby spyder_xlch » Thu Oct 16, 2008 7:37 pm

A spammer had some spam spammed on the board and spammed this post just before BillPappy posted but the spammer's spam is deleted now.
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Re: Motor Mounts

Postby SunbirdMan » Thu Oct 16, 2008 10:26 pm

That makes more sense, thanks Matt. BillPappy, sorry about the confusion.
Roger---------------------------------------------------------------
UNLESS OTHERWISE SPECIFIED
DIMENSIONS ARE IN INCHES
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