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I think there's a fair chance it could separate from the rubber. In this application I'm not really concerned, because it's encased between the rubber lips and won't really have anywhere to go. I'll update this post down the road after they've been tested out.
Checked on them tonight, after sitting for about 24 hours. The WW was dry all the way through, it was less than 1/4" thick throughout so I applied the second layer:
I think that after ~2 more layers of equal thickness, they'll be done. I tried to separate the WW from the rubber - it will separate when you pry at it. Overall it adheres well though. I think that with the cavities filled properly, it will grab well enough to serve as a bolster for the mounts. I found that it's extremely tough when it comes to snapping/shearing the WW itself in tension.
Finished these today. The finish is a little wavy because I wrapped them in tape (to contain any running of the WW) but it's ok. Seems to be dry all the way through, nothing left to do at this point except install them when the new motor goes in.
I just had an idea on this, you design 3D prints right? Design up a "mold" to go around the outside, and just fill the mold with WW. You could build up and out more that way......
Development and testing of these mounts took years and gazillions in development cost so chances of one getting it to perform better and longer lasting with gluing some extra rubber on, are very slim to none.
Development and testing of these mounts took years and gazillions in development cost so chances of one getting it to perform better and longer lasting with gluing some extra rubber on, are very slim to none.
Ods are probably much better playing lotto.
See, I believe that 100% for the actual Porsche mounts... and their price reflects the engineering. They're a compromise between durability and harshness - they engineered mounts that last a (relatively) long time yet dampen well. It's what I have in my actual car right now, they're probably 10 years old and doing fine.
The ones I modified don't have much in common with the Porsche mounts except that they are the same shape. I doubt the rubber is the same quality, and it certainly isn't hydraulic-filled. I also doubt they spent even 1% of the time and effort that Porsche did when designing the real ones and the results reflect that... people say they fail within a year pretty commonly. They dampen well (it's just rubber basically) but the engineering just wasn't there when it came to making it durable. My modification won't make them perform any better (in fact it's very likely to make them stiffer) but maybe it will give it the longevity that wasn't cast into the original design - which was basically a bunch of rubber cast into the same shape as the OE mount.
I think that the Porsche OEM mounts are very good..However, the advancement of types of rubbers and plastics have made momentous gains in those fields in the last 30+ years...I doubt that Porsche has seen the need to do any upgrades to the original formulas and configurations, and consider, very correctly, their mounts to be adequate.
odonnell: agree, some aftermarket mounts are complete trash, some try to mimic original with actual fluid in them (hamburg technic) while some are actual OE parts with numbers removed.
The $hitty solid ones could only gain some life with rubber reinforcements.
Tiger: I don't find the development document for these ( I know it is there somewhere in the interwebs), but the processes and data in there totally blew me off, I never would have thought so much effort goes to seemingly so simple part.
If I remember right 944 was the first time for rubber/hydraulic mounts and it is used in all sorts of equipment ever since.
04-27-2016, 10:11 AM
