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John Deere Tractors Discussion Forum
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4020

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FastFarmall

02-21-2021 15:28:13




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Why did the last 4020 John Deere's, have that small exhaust pipe on the later ones?




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ss55

02-22-2021 06:26:45




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 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.



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WTW

02-21-2021 18:14:43




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 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.



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svcummins

02-22-2021 01:12:00




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 Re: 4020 in reply to WTW, 02-21-2021 18:14:43  
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



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Robert (ID)

02-23-2021 18:53:55




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 Re: 4020 in reply to svcummins, 02-22-2021 01:12:00  
HUH??? whats that?? I cant hear you, you need to speak up.... WAY too many hours on howling tractors with straight pipes...



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svcummins

02-23-2021 22:12:35




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 Re: 4020 in reply to Robert (ID), 02-23-2021 18:53:55  
Yes but they sounded good when the front end starts coming off the ground a little bit and she really starts to pull



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FastFarmall

02-21-2021 19:23:17




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 Re: 4020 in reply to WTW, 02-21-2021 18:14:43  
Well did they continue that practice,with the 30,40 and up series?



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WTW

02-22-2021 06:16:30




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 Re: 4020 in reply to FastFarmall, 02-21-2021 19:23:17  
Only on NON turbo models.



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svcummins

02-22-2021 03:18:24




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 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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svcummins

02-21-2021 18:11:07




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 Re: 4020 in reply to FastFarmall, 02-21-2021 15:28:13  
Better visibility



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