Quote:
Originally Posted by Beadybc
How do they actually work because the ones that I have don't have the threaded part on both sides as you can see in the photos. Do you just cut them in the middle to get two or do the metal parts slide out of the rubber?
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None of the above!
If you look at your pics, you'll see in one of them there is the metal end still in the bracket and you can see where the rubber has come away and it's basically a flat disc. Imagine a couple of normal bolts but with the heads replaced with similar flat discs. Have a jig so these bolts could be held securely with a gap in between and this gap is fill with rubber, polyurethane or nitrile compound and allowed to set.
It bonds to the flat discs so the two threaded parts are now held apart (and together!) by the rubber/PU/nitrile in the middle.
Because the compound in between the two threaded parts is fairly strong it will support various weights but more importantly, dampen vibration from one end to the other of the mounts while returning to it's original shape when the vibration stops. This makes them resilient, hence the name of resilient mounts.
They are used a lot in NVH engineering (Noise, Vibration and Harmonics) to prevent noise being transmitted, vibrations which may eventually cause mechanical damage or other problems. Perfect exhaust mount for a classic Mini or the noise and vibration from the exhaust would transfer to the floorpan creating a sounding chamber better known as the passenger compartment.
As you can probably guess, you wouldn't really want vibration from the engine upsetting the mixture in the fuel distributor (easily done as it's controlled by an air-flap on a spring, lifted by incoming air to the engine) which is why the fuel distributor is mounted on them.