Re: 4020 in reply to FastFarmall, 02-21-2021 15:28:13
Acoustics and noise reduction, high noise levels for the operator started to be a concern around 1970. Noise levels were starting to be recorded in the Nebraska tractor tests. A few years later quiet cabs were in big demand. Nearly new tractors were being traded in to get a tractor with the new cab.
Re: 4020 in reply to FastFarmall, 02-21-2021 15:28:13
It was called exhaust tuning / back pressure. Tractor would produce more power more efficiently with tuned exhaust. I have seen a 4040 on dyno loose 5 hp by removing muffler and running with a straight pipe. Owner thought the chrome pipe was cool till he seen that and put muffler back on.
I thought the chrome pipe was cool too for a few years but even with ear muffs I could still here that stack when I went to bed at night but it did sound good
Re: 4020 in reply to FastFarmall, 02-21-2021 19:23:17
No more round mufflers on the big tractors anyway until you got to the real big tractors then they had round again the 30 and 40 series 4wd with the stacks still in the hood had oval mufflers
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