30-03-2020, 11:03 PM
When removing the carbs from my Armstrong Siddeley Star Sapphire, I found thackeray (double-coil) spring washers under the mounting nuts.
After asking around I found that they are correct and need to be used with a resilient joint packer between carb and manifold. They say it reduces the transmission of vibration from the engine to the carb. Apparently you do the nuts up tight and then back off a bit (don't know how much but half a turn sounds about right). I thought it was all wishful thinking but several different cars including TRs used this method so I guess it works.
Ivan
After asking around I found that they are correct and need to be used with a resilient joint packer between carb and manifold. They say it reduces the transmission of vibration from the engine to the carb. Apparently you do the nuts up tight and then back off a bit (don't know how much but half a turn sounds about right). I thought it was all wishful thinking but several different cars including TRs used this method so I guess it works.
Ivan