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Member
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Join Date: Jul 2010
Location: Alberta
Posts: 115
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Member
Join Date: Jul 2010
Location: Alberta
Posts: 115
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Hyde, thanks for the link! I'll add it to my personal tech bible.
Teleyota, I have heard a lot of horror stories of poly as well, and have had bad results myself. I believe there is great merit to torsiolastic (no idea how to spell it, but a combination of torsion elastic words) bushings. A little give absorbs a lot more vibrational oscillations versus a rock solid compound that creates a very good transfer path for harmonics as well as force. I replaced the rear 4-link bushings and body bushings in my 67 impala with poly back in the day, and the increase in the road noise and driveline harmonics transferred through the harder bushings an into the cabin was very noticeable, and it handled worse, in my opinion, with the poly 4-link bushings. Ended up bending a connecting rod trying to push well past 8000 rpm, and have since put that project on hold, fiscally and emotionally, years ago, but that's a different story.
For every harmonic resonance, there are three components: the source, the transfer path, and the responder. Create a more efficient transfer path, and the responder can change drastically
Dry rot or cracking is probably the most common failure, but you can also unload the bushings (take weight off the front end and jack it up by another component) and insert a prying device and manually manipulate it to check for movement, as well.
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87 4Runner Diesel swap in progress- stay tuned for writeup
If Nobody From The Future Comes And Stops You, How Bad Of A Decision Can It Really Be?
Last edited by Howitzer; 02-10-2021 at 11:19 PM.
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