Muffler or Straight Pipe?
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URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=63058
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Topic: Muffler or Straight Pipe?
Posted By: R.W
Subject: Muffler or Straight Pipe?
Date Posted: 11 Jan 2013 at 3:38pm
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Is there any power or performance difference between running a straight pipe vs an everyday stock muffler? ------------- In Search Of: 1958 Allis Chalmers D17 Diesel serial #9643D |
Replies:
Posted By: dgerth
Date Posted: 13 Jan 2013 at 6:46am
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Just MHO, but unless you have performed intake mods or the like, a straight pipe over a muffler only makes more noise and seems not to be any advantage. For what it's worth. dgerth
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Posted By: wi50
Date Posted: 13 Jan 2013 at 8:51am
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I like mufflers if they can flow enough air and on a 4 cyl they usually can. I'll buy a $20 glass pack or cherry bomb muffler (whatever you want to call it) when I need to put something on one. Available in all kinds of sizes and the outside diameter is small enough to fit the original hole in the hood. Sounds nice, takes the bite out. ------------- "see what happens when you have no practical experience doing something...... you end up playing with calculators and looking stupid on the internet" |
Posted By: cwhit
Date Posted: 13 Jan 2013 at 1:57pm
| If I feed it, I want to here it EAT. But on a 4 banger a straight pipe probably not much of an advantage. |
Posted By: R.W
Date Posted: 14 Jan 2013 at 4:39pm
So at the end of the day, a 201 would not really benefit. Hmm... Oh well, I still think it sounds cool! So it will stay on for now!  ------------- In Search Of: 1958 Allis Chalmers D17 Diesel serial #9643D |
Posted By: Seth Souerdike
Date Posted: 14 Jan 2013 at 6:35pm
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Straight pipes our great. I met my Grandfathers neighbor once who showed me his collection of which one was a Farmall Super M with Chrome straight pipe. Boy that lady pured!!!!!!!!
------------- There are no atheist in foxholes. |
Posted By: mufflerboltz
Date Posted: 14 Jan 2013 at 8:25pm
| along with the straight pipe or muffler deal, when i was younger i always wanted to straight pipe anything with an engine but my father would always say that a straight pipe on an old tractor was hard on the valves! Is this true or was that his way to keep me from hacking the mufflers off his tractors? |
Posted By: WildBill
Date Posted: 15 Jan 2013 at 11:29am
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My theory is watch the size of the straight pipe diameter. You need back pressure to pick up exhaust velocity to get rid of gases faster . I big fatty pipe allows it to hang around in the chambers. Headers produce velocity independently per cylinder. Look I like straight pipes like the rest of ya. Wi 50 post stated he runs a glass pack. That still builds velocity but tames the sound . I seen a guy atvs pull with a moline which had a 5 or 6 chromy pipe. I cud hear every valve lope and hiss. My opinion is just watch size and length . Exhaust valve burning is just a lean cylinder. Egt too hot . ------------- Allis fan for life ! B,C,2-WC'S,WD45G,D19G,190xt ,LLSS 8010, terra tiger refurbished |
Posted By: WildBill
Date Posted: 15 Jan 2013 at 11:30am
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The word atvs is supposed to be " at a" Auto correct ------------- Allis fan for life ! B,C,2-WC'S,WD45G,D19G,190xt ,LLSS 8010, terra tiger refurbished |
Posted By: Goose
Date Posted: 15 Jan 2013 at 12:18pm
But problems arose when the pipes were short and the outside air (cold compared to the hot exhaust) backflowed into the valve area of the engine. It would sometimes damage the exhaust valves (warp and even crack). I think it would apply to tractor engines as well.
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mufflerboltz wrote:Posted By: R.W
Date Posted: 15 Jan 2013 at 5:40pm
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Do you think a rain cap would solve the cold air problem? ------------- In Search Of: 1958 Allis Chalmers D17 Diesel serial #9643D |
Posted By: allischalmersbrad
Date Posted: 19 Jan 2013 at 8:21pm
| I have talked to guys who have checked this by doing dyno comparisons and the say that they usually get most HP with stock mufflers. A couple of guys in our tractor club also did this last year with an M International. They said they showed about 4-5 more horse with the muffler. The guy that owned the M still pulled it without the muffler cause he likes the way it sounds. By the way, these were stock tractors. Maybe with engine mods it would make a difference? |
Posted By: R.W
Date Posted: 19 Jan 2013 at 8:33pm
------------- In Search Of: 1958 Allis Chalmers D17 Diesel serial #9643D |
Posted By: Dipstick In
Date Posted: 19 Jan 2013 at 8:43pm
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Huh? What dja say? That's the sound I make when the g-kids don't speak loud enough for me to hear! In the past when times were tough, and I could'nt afford a muffler, I ran straight pipes. I can tell now it didn't do my ears any good. But at 72, I dont think I can go back and fix it! ------------- You don't really have to be smart if you know who is! |
Posted By: EricSWPA
Date Posted: 19 Jan 2013 at 11:36pm
| Lol |
Posted By: mlpankey
Date Posted: 21 Jan 2013 at 8:18pm
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it depends on how the exhaust ports have been modified if they are flowing over 80 percent of the intake then a muffler restricting flow will pick up the torque. If the intake has been modified and the exhaust ports have been left alone then a straight pipe can help on a 226 style four cylinder .jmho a engines a air pump it cant take in anymore than it gets rid of . hard to fill a cylinder if the exhaust is reverting. if it has soot in the intake it has reversion. ------------- people if they don't already know it you can't tell them. quote yogi berra |