Posted by showcrop on February 10, 2020 at 03:36:53 from (75.68.37.174):
In Reply to: Tractor muffler posted by 300jk on February 09, 2020 at 09:45:55:
I have a Ford 960 that I bought in 2000. I bought it primarily for pulling competitions. During the first year I found that it was in need of a major engine overhaul. I elected to get it done at an engine shop, while I did a lot of other work that it needed. I had acquired a dynamometer, and left over from my motorcycle competition days I had a decibel meter. Following my first season of pulling with the new motor I got into some fine tuning. I had noticed at the pulls that my little Ford was very quiet compared to most other tractors at the pulls. While sitting idling amongst other tractors while waiting to hook, the exhaust of my little Ford with its Stanley muffler was not even audible, making it necessary to look at the tach to insure that it was still running. I did some testing and got a reading of 84 decibels at an idle, and only 88 db at full load on my dyno. This made me confident that I could open the straight through Stanley up a little and not be loud compared to others' tractors. I opened it up in increments by putting a length of one inch pipe through it, and pressing the little tabs down flat, two rows at a time. I finally ended up with 3/4 of the tabs flattened down, and an increase of 2 decibels at full load. Horsepower increase measurements were inconclusive due to the variations in measurements without making changes. This leads me to conclude that the Stanleys are very effective at quieting my tractors and they have held up very well, lasting twenty years with little apparent deterioration.
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