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John Deere Tractors Discussion Forum
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4020 Muffler vs Straight Pipe

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Jon (IN)

04-01-2005 09:25:07




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Bringing home my "new to me" 1966 4020 diesel this weekend. The previous owner was running a straight pipe for the exhaust. I want to put a muffler back on it. Is there a reason he was running the straight pipe or why I couldn't put a muffler back on it?




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H2

04-02-2005 05:10:08




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 Re: 4020 Muffler vs Straight Pipe in reply to Jon (IN), 04-01-2005 09:25:07  
Tuned back pressure is very important on a 2 cycle engine, but I'm not so sure about that on a 4 cycle. I've never seen the pro pullers trying to get max hp out of an engine restrict exhaust. Usually they run straight tube headers with miminal and equal tube runners to use gas velocity to pull as much exhaust out of the cylinder to prepare for the next fuel/air charge. I thought the main purpose for muffler restriction on a 4 stroke was to reduce noise (dampen exhaust pulse). I'm no expert and I may be wrong, but it's a good topic to discuss.

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Grampa Lee

04-01-2005 19:46:46




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 Re: 4020 Muffler vs Straight Pipe in reply to Jon (IN), 04-01-2005 09:25:07  
A friend of mine changed the Muffler on his 4020. Tractor would not turn over after changing muffler. Took it to dealer. Engine was stuck from carbon falling down on pistons. Dealer advised when changing mufflers to have tractor running at high speed. Grampa Lee



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buickanddeere

04-01-2005 14:22:41




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 Re: 4020 Muffler vs Straight Pipe in reply to Jon (IN), 04-01-2005 09:25:07  
"Back Pressure" being required..... ....no. An engine tuned to compensate for back pressure yes. Engine problems when tuned for back pressure and ran without back pressure..... ...sometimes on a carbureted engine. Certainly a chance of less power & efficiency. Increased HP with a muffler on a diesel...possible. Mother Deere may have tuned that muffler to scavenge exhaust like a good two stroke exhaust system. That diesel may have had less back pressure with the muffler. Bigger dia isn't always better when dealing with fluid dynamics. Huh, speak up, can't hear you. Used to run a straight pipe and no hearing protection. Even with a muffler.

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Jon (IN)

04-01-2005 11:02:38




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 Re: 4020 Muffler vs Straight Pipe in reply to Jon (IN), 04-01-2005 09:25:07  
Thanks guys. I will pickup up a muffler this evening from the local Deere dealer. I like to hear a nice engine as much as the next guy, but I much rather see and feel what she can do, as opposed to hear what she can do.....



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Jim in AK

04-01-2005 10:55:37




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 Re: 4020 Muffler vs Straight Pipe in reply to Jon (IN), 04-01-2005 09:25:07  
I got my 4010 some years ago. It came with a Ray Jay turbo and a shiny straight pipe. I also wonder why no muffler. It has been my experience with this 4010 that it is really easy on the ears. I have no complaints with this set up, and I have no desire to change it. My 2 cents.

Jim in AK



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JDBert

04-01-2005 14:14:11




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 Re: 4020 Muffler vs Straight Pipe in reply to Jim in AK, 04-01-2005 10:55:37  
M&W turbo kits came with a chrome straight pipe. If you had the early kit on your 4010 the exhaust is actually moved back and you got a tin cover for your original muffler hole, the later kits for the 4020 (also adaptable to 4010's) exited out the regular muffler hole.



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Jim in AK

04-01-2005 17:58:04




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 Re: 4020 Muffler vs Straight Pipe in reply to JDBert, 04-01-2005 14:14:11  
The exzost hole in the hood has been moved back but the turbo is a Ray Jay.

Jim



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TBSCOTT

04-01-2005 12:36:00




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 Re: 4020 Muffler vs Straight Pipe in reply to Jim in AK, 04-01-2005 10:55:37  
A straight pipe on a turboed engine is very quiet and not too bad on the ears where a natural aspirated engine with a straight pipe is loud and obnoxious.



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WTW

04-01-2005 10:03:45




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 Re: 4020 Muffler vs Straight Pipe in reply to Jon (IN), 04-01-2005 09:25:07  
Good chance the tractor will produce more power with the muffler back on it. I once had a stock 4040 tractor brought to the shop that the owner was complaining about horsepower. I told him that if he took off his straight pipe that it would help it some. He argued with me and told him to go get his muffler and we will see what the difference is on the dyno. Tractor increased a little over 5 HP on the dyno. Proper back pressure on non turboed diesel engines do make a difference. I was reading on here a while back about people not liking the skinny small diameter exhaust pipes mufflers on there late 4020 and put on later mufflers off 4240 and such. They wouldn't do that if they really want maximum efficiency from there tractor. Just some fact not fiction. DW

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Mike Aylward

04-01-2005 20:41:16




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 Re: 4020 Muffler vs Straight Pipe in reply to WTW, 04-01-2005 10:03:45  
Dave, I had to do this on my 4020 or I was going to melt the muffler off the tractor..:-) Of course, it has been "enhanced". Mike



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Cory R.

04-01-2005 09:39:08




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 Re: 4020 Muffler vs Straight Pipe in reply to Jon (IN), 04-01-2005 09:25:07  
Some people just like to blow there ear drums out. The 4020 came stock with a muffler, if i were you i would put one back on. My brother is a good one for running a straight pipe he thinks all tractor should have one. But straight pipes are hard on the ears and they dont give the engine any back presure which is hard on the engine its self.



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TBSCOTT

04-01-2005 12:32:54




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 Re: 4020 Muffler vs Straight Pipe in reply to Cory R., 04-01-2005 09:39:08  
Please explain how the lack of back pressure "hurts" an engine.



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Gerald J.

04-01-2005 09:38:30




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 Re: 4020 Muffler vs Straight Pipe in reply to Jon (IN), 04-01-2005 09:25:07  
Your ears are a fair reason to put a muffler back on, though you will still need hearing protection.

Gerald J.



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Mike M

04-01-2005 09:37:04




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 Re: 4020 Muffler vs Straight Pipe in reply to Jon (IN), 04-01-2005 09:25:07  
Only reason I can think of that you wouldn't be able to change back is if he broke the manifold and couldn't get a muffler back on it.



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