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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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PROS AND CONS OF STRAIGHT PIPE vs. MUFFLER

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Ed (KS)

10-07-2004 16:43:59




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Any ideas on this? I know the noise is greater with the straight pipe, but what are the other considerations? Ed




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johndeereman

10-08-2004 13:23:05




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 Re: PROS AND CONS OF STRAIGHT PIPE vs. MUFFLER in reply to Ed (KS), 10-07-2004 16:43:59  
yes you do gain horsepowe with my jdb it wouldnt even try to budge the sled with a muffler put the straightpipe on and still cant budge the sled but not from lack of power have too much power not enough weight weve proven this at the pulls we take a farmall because the mufflers are removed easy pull with the muffler then take a muffler off and pull again you will see a big diff.they claim you gain 7 horse without a muffler.

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JJA

10-08-2004 05:00:40




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 Re: PROS AND CONS OF STRAIGHT PIPE vs. MUFFLER in reply to Ed (KS), 10-07-2004 16:43:59  
Changing the subject a litte bit. Does the same apply to trucks. My sons insist that straight piping their pickup trucks improves mileage. I can't imagine it is worth the noise.



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Oklahomatractorrebuilder

10-08-2004 07:48:19




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 Re: PROS AND CONS OF STRAIGHT PIPE vs. MUFFLER in reply to JJA, 10-08-2004 05:00:40  
JJA I know for sure that on a long haul truck you will gain milage with straights over mufflers. We raised our mileage almost a mile per gallon back when we were driving out truck in the oilfield. It also sure sounds good when coming into a town in the wee hours of the morning with the jake brake on. Tim



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M Guy

10-08-2004 04:31:56




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 Re: PROS AND CONS OF STRAIGHT PIPE vs. MUFFLER in reply to Ed (KS), 10-07-2004 16:43:59  
Nothing sounds better than an Oliver with a straight pipe as long as I don"t have to sit behind it all day. They where a sweet sounding engine gas or diesel.


Later,
Will



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Jack B. Nimble

10-08-2004 04:11:14




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 Re: PROS AND CONS OF STRAIGHT PIPE vs. MUFFLER in reply to Ed (KS), 10-07-2004 16:43:59  
On a high performance engine a "tuned" straight pipe makes a difference. On a stock tractor engine, sticking a straight pipe on really only makes more noise and in some cases could actually hurt performance. Less back pressure means the engine will run leaner and some carb adjustments will have to be made to get better performance. Unless you have the equipment to test your true HP, adding a straight pipe will probably only accomplish bad hearing and angry neighbors!

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old

10-07-2004 20:07:14




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 Re: PROS AND CONS OF STRAIGHT PIPE vs. MUFFLER in reply to Ed (KS), 10-07-2004 16:43:59  
I run all my olivers with a stright pipe I just make sure its tall as in over my head when I'm sitting on the seat. They run strong and its not that hard on the ears that way.



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dwm

10-07-2004 17:22:43




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 Re: PROS AND CONS OF STRAIGHT PIPE vs. MUFFLER in reply to Ed (KS), 10-07-2004 16:43:59  
Friendly advice--If you want to run a straight pipe briefly for a pull or something, fine. But for any long term work, stick with a muffler. You will not be able to hear as well in later life if you don't.



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RAB

10-07-2004 16:52:05




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 Re: PROS AND CONS OF STRAIGHT PIPE vs. MUFFLER in reply to Ed (KS), 10-07-2004 16:43:59  
Back-pressure.
RAB



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Ed (KS)

10-07-2004 18:53:45




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 What are Pros and Cons Regarding Backpressure? in reply to RAB, 10-07-2004 16:52:05  
I know less back pressure means more horsepower. I also know backpressure makes engine run warmer. What else?



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Hank MO

10-08-2004 04:40:46




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 Re: What are Pros and Cons Regarding Backpressure? in reply to Ed (KS), 10-07-2004 18:53:45  
Less back pressure more HP yes, (kind of) but some back pressure (due to good exhaust flow) may provide more low end torque. It's a trade off, and the ideal depends on what rpm you intend to run at most often, and what you intend to pull with it.
With regards to straight pipe, you want it just long enough so that it aids in "scavenging" exhaust gases from the head/manifold. Correct diameter for ideal gas flow depends on... once again the rpm you intend to run it.
Good rule of thumb is to have straight pipe the same diameter as the manifold collector. Once heard that when you install a straight pipe, make it extra long. Take a grease pencil (or crayon) and draw a line down the pipe from tip to manifold. Get the engine good and warmed up, and where the line has stopped melting is where you want to cut off your pipe. Sounds kinda like old farmers tale to me... but it's a cute story. I never tried it and it dont' make much sense to me.
My opinion.
Hank

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Oklahomatractorrebuilder

10-08-2004 07:43:23




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 Re: What are Pros and Cons Regarding Backpressure? in reply to Hank MO, 10-08-2004 04:40:46  
HankMo the mark deal really works. Also looking for flame out the pipe. The mark where the pencil stops melting is the best place to cut the pipe for max HP. We have learned from practice. Also cutting off 1/2 inch of pipe while in the field plowinng until it pulls the best. Same as settinng the carb on a LPG tractor under load in the field. Tim



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Hank MO

10-08-2004 09:56:29




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 Re: What are Pros and Cons Regarding Backpressure? in reply to Oklahomatractorrebuilder, 10-08-2004 07:43:23  
I havn't tried the "mark" thing, but there's no arguing with something that works.
My skepticism is that I think you'd get a different length pipe if you where located in south Texas in the summer as opposed to North Dakota in the winter... If you were running first gear or top gear... if you were running high octane aviation fuel or high content of ethanol... if it was 99% humidity outside or if it was 0%.
This being said, when I get to putting the pipe on my current project... I'll check it out and may become a believer.

Hank

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Oklahomatractorrebuilder

10-08-2004 12:43:44




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 Re: What are Pros and Cons Regarding Backpressure? in reply to Hank MO, 10-08-2004 09:56:29  
Hank yes it does make a difference where you are and the temp outside, but, we do most of our plowing here after dark in the summer months, so for us at least it works good. I am sure I would have to set it different if all I did was pull with it at pulls because of the warmer temps during the day. I know that during the day if I shut our Super M off without running out of propane it will have to be pulled to start unless it sets for a while. Tim

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RAB

10-07-2004 22:53:28




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 Re: What are Pros and Cons Regarding Backpressure? in reply to Ed (KS), 10-07-2004 18:53:45  
Nothing else.
RAB



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