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Tractor Pulling Discussion Forum

Straight pipes

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Shaggy

02-23-2004 12:15:28




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Just a quick question. Why do most of you guys run a short but big around pipe? Just wondered.




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The Rodent

02-24-2004 17:36:53




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 Re: Straight pipes in reply to Shaggy, 02-23-2004 12:15:28  
I run a short fat pipe because if I do when I get back from a pull I just put my trailer in the shed with the tractor on. If my pipe was taller it wouldn't fit though the door. And I makes the tractor bark!!!!! !!!



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Shaggy

02-24-2004 08:36:36




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 Re: Straight pipes in reply to Shaggy, 02-23-2004 12:15:28  
Doesn't the noise and the fumes bug you. I know you are not on them very long. I like the noise and the smell of racing gas just like the next but not face first. But thats me. But I LOVE to watch!!



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ronjohn

02-24-2004 07:48:21




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 Re: Straight pipes in reply to Shaggy, 02-23-2004 12:15:28  
i run 2 G's on has a 4in chrome teardrop stack that is level with the air intake, that one puts out a beutiful sound, especially when the crowd sits to the right of the tractor. the other G has 2 5in chome stacks that are level with each other, but i have a 4in stack inside the 5in on the exust so that i dont loose back pressure, it barks louder with the 4 anywaze, i just have the 5in on there for looks.

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Mopower

02-24-2004 07:34:00




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 Re: Straight pipes in reply to Shaggy, 02-23-2004 12:15:28  
I run a 2-3/4" pipe on my old U about 18". The motor was stock, but it still was about the "barkiest" tractor at most pulls. I find that the large diameter short pipes just blat and you don't get that famous DEEP tone bark on a MM. Dad runs a 3ft. 2-3/4 pipe on his G motor UB and it has an unmistakeable sharp bark. Last year kids were plugging their ears when it pulled. Not a hot engine, but sounded fantastic. I prefer to let that exhaust note echo a little in the long pipe. I was told a short big pipe open with no flipper lets cool air right back in as soon as the motor is shut off and it cools unevenly. Maybe nothing, but I always run a rain cap. I love tall stacks. E.J. Potter ran those Allison motors and said the stacks had to be the tallest thing on the tractor. (Not for performance I think but just because.) My 2 cents.

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a puller

02-23-2004 15:54:58




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 Re: Straight pipes in reply to Shaggy, 02-23-2004 12:15:28  
the bigger around, the deeper the sound. I kinda like the taller ones, but most like the looks of the shorter pipes about the same heighth as the air breakther pipe on the JD's, but I like them about 3-5" above them. On my MM U, I like one that is about 8-10" above the hood and at least 4" around..... .jsut my opinions



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LW

02-23-2004 16:27:02




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 Re: Re: Straight pipes in reply to a puller, 02-23-2004 15:54:58  
I dynoed a 563 cid MM with a 1 7/8 primary header with all the pipes leading into a 5" pipe about 18" long, it wouldn't idle well or respond with the load well,I cut it off put on a 5 to 3.5" adapter to make into a collecter area, then put a 3.5" pipe about 30" long it was worth a good 8-10hp at 2300rpm and then the tractor idled well and this had nothing to do with backpressure.



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TimC

02-23-2004 17:31:51




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 Re: Re: Re: Straight pipes in reply to LW, 02-23-2004 16:27:02  
Pressure waves. Length of travel from valve seat to collector to atmosphere plus cam timing = free horsepower.

Good observation or should I say doing it your own way to prove you were right. Same thing goes for the length of the intake runners. Pressure wave action.



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a puller

02-23-2004 18:31:28




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 Re: Re: Re: Re: Straight pipes in reply to TimC, 02-23-2004 17:31:51  
could this explain why our JD G has 68-70hp and all the others have 60-65 with the same or more done to them?



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tractorboy

02-23-2004 18:44:58




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 Re: Re: Re: Re: Re: Straight pipes in reply to a puller, 02-23-2004 18:31:28  
Put straight pipe on your tractor a lot longer than you need and make a line all the way up and down with a grease pencil. Hook your tractor to a dyno or find some other way to get it up to temp and work it for a few minutes. Cut your pipe off where it quit melting off your line.



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LW

02-23-2004 19:21:11




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 Re: Re: Re: Re: Re: Re: Straight pipes in reply to tractorboy, 02-23-2004 18:44:58  
Actually you should go 3 to 6" past that point, usually the pipe will end up a lot longer than you would want on your tractor!



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tractorboy

02-23-2004 19:31:14




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 Re: Re: Re: Re: Re: Re: Re: Straight pipes in reply to LW, 02-23-2004 19:21:11  
Your probably right. I don't know specifics of it but I do know that it helps.



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Oklahomatractorrebuilder

02-23-2004 21:10:42




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 Re: Re: Re: Re: Re: Re: Re: Re: Straight pipes in reply to tractorboy, 02-23-2004 19:31:14  
LW I did that a few years ago and my Super M now has a 54 inch pipe on it. The only difference we did was to watch the mark in a wheat field with a 18 ft oneway behind it. Tim



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LW

02-24-2004 08:09:00




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 Re: Re: Re: Re: Re: Re: Re: Re: Re: Straight pipes in reply to Oklahomatractorrebuilder, 02-23-2004 21:10:42  
You noticed quite a difference over a short pipe or muffler didn't you, the only issue is most pullers don't want to have a tractor with that much pipe sticking up because it's not as attractive as a short chrome one.



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ChadS

02-24-2004 10:52:12




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 Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Straight p in reply to LW, 02-24-2004 08:09:00  
I am more of a long chrome stack person, myself. It gives it a nice deep sound, keeps smoke out of my eyes, heck, just makes the tractor look bigger. I have a 50x5 inch chrome stack on the 460, and the JD 730. Just like the look. Chad



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Oklahomatractorrebuilder

02-24-2004 12:56:00




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 Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Straig in reply to ChadS, 02-24-2004 10:52:12  
Looks only mean two things to me, as long as I don't paint my Super M and leave it covered in dirt and greese from the field when I show up for a pull no one wants to get next to me and I usually win the uguliest tractor trophy. Looks do not make the tractor pull any further down the track but power and traction do. Tim



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770

02-23-2004 13:53:58




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 Re: Straight pipes in reply to Shaggy, 02-23-2004 12:15:28  
I was told by an old timer to cut your straight pipe right where it turns that funny color blue.... He said that's where the best "draw" was. Any truth to this??? By the way, he was one heck of an engine builder....



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AC

02-23-2004 13:37:58




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 Re: Straight pipes in reply to Shaggy, 02-23-2004 12:15:28  
You mean to tell me size DOES matter????? ????



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buickanddeere

02-23-2004 13:15:47




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 Re: Straight pipes in reply to Shaggy, 02-23-2004 12:15:28  
Parden....what did you say?



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Tyler Neff

02-23-2004 12:26:38




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 Re: Straight pipes in reply to Shaggy, 02-23-2004 12:15:28  
I use the big shiny pipes to get your attention away from they way my sheet metal looks ,and anyone whose seen my tractors will agree.



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CASEPOWER

02-23-2004 12:24:52




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 Re: Straight pipes in reply to Shaggy, 02-23-2004 12:15:28  
Sound or Looks, take your pick.



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Farmall Doctor

02-23-2004 16:02:46




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 Re: Re: Straight pipes in reply to CASEPOWER, 02-23-2004 12:24:52  
sound, Looks, HP!!! I noticed a gain of almost 2 hp on my Super M on the Dyno between A muffler and my straight pipe!! Will post a pic soon....



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CASEPOWER

02-23-2004 16:24:47




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 Re: Re: Re: Straight pipes in reply to Farmall Doctor, 02-23-2004 16:02:46  
Don't doubt that. I am talking about the difference between a pipe that it the right size for and engine. Lets say a 3 inch on a 300 cube engine compared to putting a 5 inch crome on the same engine.



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Mopower

02-24-2004 07:38:11




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 Re: Re: Re: Re: Straight pipes in reply to CASEPOWER, 02-23-2004 16:24:47  
Any comment on Denny's Y-pipe? It splits and comes back together? Scavenging effect? Love or hate Denny's stuff, I think there is something to that, and dynoed results, but not sure. Still an M Farmall will never sound as tough as a U MM without major work. Not sure why.



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