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Bob, I have restored several British sports cars. Polyurethane bushings in all sorts of colors are sold by major parts suppliers, and people love them because "they're stiff" and " they're tough". There is nothing wrong with them. I just prefer not to use them for a subtle reason.1. Several years ago, Sports and Classic Car Magazine (I think) had a cover story abut a comparison between two MGA's, both of which were on the cover. The cars were identical even to the light blue color. One car was totally original and very low mileage, around 30,000 miles as I recall. The other car was freshly restored using modern materials and parts but still authentic. Two writers left in the two cars for a weekend.They drove a day to the other part of the country, overnighted, then swapped cars the next day for the trip back home. They then compared the cars and wrote about it. They were unanimous that the original car was superior in every way, especially handing and ride. The fresh restoration was very stiff and harsh riding, and not as comfortable for a long trip. It was attributed to several things but one major one was polyurethane bushings and body isolators throughout. I also had a friend who worked at a British sports car factory and he once mentioned how much trouble the engineering department went to determine exactly what hardness rubber to use in various bushings, They would take it to the test track, record data, then spend time removing softer bushings to install higher hardness bushings or vice versa. A lot of engineering time was spent to get everything as it should be. Likewise, I personally designed some very large industrial isolators many years ago. I started with something like 85 Shore B hardness, tested, and went to 80 and tested. I eventually selected the exact hardness needed for my application. I have never seen any hardness specification on any isolators and would not expect anyone to ask or answer-like I said, its subtle! Finally, I restored a 63 E Type a number of years ago. It used OEM or NOS parts wherever possible and no polyurethane in any of the bushings or isolators. It drove like a dream. Then, my son asked me to restore one for him, which I did-but he wanted all the boy racer stuff. Competition shocks, nice red poly bushings , etc. So for a year, I could drive either car as I finished up his car. I would not have realized how horrible his car was had I not been able to drive my car also. It was a different car-but it was very stiff, and he loves it! That's my opinion, and there is nothing wrong with poly bushings. They are tough. Best, Mike Moore On Feb 12, 2014, at 5:07 PM, Bob Jasinski <rpjasin@xxxxxxxxxxx> wrote: Michael,
That's bad news. I just let a spare pair of originals go because I thought I could always get new ones. I wonder how wide spread the problem is, polyurethane is very popular for front end parts. Any others on the list having a bad experience with the repro's? What does Imperial Services have to say? Warranty?
Bob J
From: Michael Moore [mailto:mmoore8425@xxxxxxx] Bob, Thanks I prefer not to use polyurethane, I have a used floating power poly mount now which is separating, I'd like to find an NOS rubber mount, or a good used one if possible. Thanks, MIke Moore
On Feb 12, 2014, at 4:21 PM, Bob Jasinski <rpjasin@xxxxxxxxxxx> wrote:
Michael, Have you tried this vendor? http://imperialservices.net/imps.html Bob J From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On Behalf Of Michael Moore Hi Tom, Jeff responded to my email today and has been terrific help. I need a NOS 220237 left side engine mount though and he doesn't have them. Mike Moore On Feb 12, 2014, at 4:59 AM, Tom Cox <tdcox@xxxxxxxxxxxxx> wrote: Jeff Carter has more parts than you can imagine. Contact him at JC Auto Restoration in Seattle. Google for website and phone number. Great guy; good to work with. He restores our letter cars to perfection but has warehouses full of parts. From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On Behalf Of Gern Blanstin Hello there, I'm new to the group and the 300 club. I have two 300k's as well as a 300G that I'm trying to bring up to par. Currently I'm trying to hunt down a pair of inner fender inspection plates for the 300G. Any info on their potential acquisition would be appreciated. Thanks
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