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Author Topic: straight pipes  (Read 4683 times)
berzins
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« on: January 07, 2007, 12:06:35 PM »

looking for opinions  on running straight pipes on an 8/71. bless me with mechanical facts. Thanks 
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JackConrad
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« Reply #1 on: January 07, 2007, 01:40:11 PM »

   2 friends have MC-7s with 8V71s with dual vertical pipes on the rear of the bus.
   One has a small resonator on each. This bus is extremely loud when under a load and always louder than I would want.
    The other one is dual straights stacks with no resonators or mufflers. This bus is OBNOXIOUSLY LOUD!!. He started it at a bus rally to show someone his new "cool" exhaust system. We could not carry on a conversation inside another bus parked approx. 75-100 feet away.  If he had revved it up one more time, he would have probably been threatened with bodily harm by several people parked near his bus. This is the type of behavior that what gives busnuts a bad name.  Jack 
   PS: Quieter is Better
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« Reply #2 on: January 07, 2007, 03:27:40 PM »

I'm glad you started this Jack because I wanted to say the same thing.  We've got an unmuffled 6-71 in a big forklift.  When they are using it in the summer I can hear it scream a mile away.  2 stroke Detroits need mufflers.  End of story.
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« Reply #3 on: January 07, 2007, 03:52:56 PM »

I had an old Reo I cut the mufflers off of & drove it about 6 months. I didn't care what anyone said because I COULDN'T HEAR ANYBODY TALKING.... (say WHAT?..... WHATDIDCHA SAAAAAY?Huh? Speak UP son... I CAN'T HEAR YOU!!!!!) DDs need mufflers. You can get by with the turboed versions but they are still loud.
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« Reply #4 on: January 07, 2007, 10:44:03 PM »

Personally speaking-there is no such thing as a too quiet vehicle.  Plus, a Detroit makes a lot of engine noise-which is good music! Good Luck, TomC
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Tom & Donna Christman. '77 AMGeneral 10240B; 8V-71TATAIC V730.
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« Reply #5 on: January 07, 2007, 11:25:55 PM »

LOUD pipes save lives  Grin
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Chaz
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« Reply #6 on: January 08, 2007, 06:25:44 AM »

I'm young enough to appreciate loud pipes and old enough to want quiet. Tough spot!  ;)LOLOL
I put cutouts in my exhaust on my '56 Chevy so if I want to tease people at a show or give the "kids" a kick, I can open them up for them inside the car. Ya might want to think about that!
  But I would say - without a doubt - quiet would be my first choice.
 
  I seen a coach or two with "tasteful" stacks out the back. That interests me. Do any of you think there is an advantage to getting the exhaust up and away from others on the ground???

  Last of the babyboomers,
        Chaz
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« Reply #7 on: January 08, 2007, 06:51:16 AM »

Thanks for all the responses,changed my mind quickley!!!!
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DrivingMissLazy
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« Reply #8 on: January 08, 2007, 07:06:22 AM »

You can get by with the turboed versions but they are still loud.
When I first had the 8V92TA put in my Eagle it just had a straight pipe. It sounded great, especially when I turned the Jakes on., but I had to add a muffler after a few weeks. It was just toooooo loud.
Richard
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« Reply #9 on: January 08, 2007, 08:29:59 AM »

LOUD pipes save lives Grin

Interesting thought, but I don't hear the loud stuff coming, I only hear it leaving.

& another thing, If you are sitting on the loud pipe machine, you can't hear danger coming (my car is quiet  Grin ).

I used to like loud until I grew up  Grin

It seemed to me that the faster & classier bikes & cars at the drag strip usually had mellow tone pipes. Mine did & always drew a crowd of admirers, not bad for a '82 cutlass that was all there down to the A/C & street tires (7.20 @100mph in 1/8 mile).
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captain ron
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« Reply #10 on: January 08, 2007, 08:53:15 AM »

That MPH seems a little high for that car and 1/8 mile   Roll Eyes  But I could be wrong  Grin  It's been years since I've raced specially  1/8 mile
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kyle4501
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« Reply #11 on: January 08, 2007, 09:54:14 AM »

That MPH seems a little high for that car and 1/8 mile Roll Eyes But I could be wrong Grin It's been years since I've raced specially 1/8 mile

You are right, that was a very quick car. I had a stack of time slips over 2" tall of 7.20 passes. After a while, you get used to it & you start doing stupid stuff on the street (like racing motorcycles, new vette's & those german sports cars). So I sold it before I lost my D.L. or life.

Was fun for a while. . .

(455, bal & blueprinted & HUGE amounts of NOx)


Oh, the rear gear was 2.7 to 3.3   The car didn't like too much & would slow down with more than 3.3
« Last Edit: January 08, 2007, 09:56:58 AM by kyle4501 » Logged

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« Reply #12 on: January 08, 2007, 10:14:31 AM »

Loud pipes saves lives if on a motorcycle as most people don't see a motorcycle and if they do they tend to ignore them.  I have loud pipes on my Harley and very quite pipes on everything else.
Please watch out for motorcycles as most of us are decent people.
LOL
ED
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Ed Van
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kyle4501
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« Reply #13 on: January 08, 2007, 12:06:36 PM »

Like I said before, I only hear the loud pipes as the bike is leaving, NOT approaching, so how does that save any lives? That combined with the fact the bike rider with loud pipes can't hear danger approaching leads me to believe the claim 'loud pipes save lives' is bogus, made up by people wanting to make lots of noise. Is there any good proof that I'm wrong? The constant on headlight is starting to loose its efectiveness now that everyone has their lights on. But the light is still better than noise.

Those loud pipes are really annoying. Do you really think it is a good idea to annoy idiots that can't drive well to start with?

I do watch out for bikes. What I notice is that most bike riders obey the laws & set great examples for highway courtesy.

I have also noticed the rogue idiot that lane splits, rides in the blind spot of cars/ trucks, & overtakes traffic with alarming speed. It is this idiot that is so easy to remember & thereby leaves a bad image for all bike riders.

This from one who loves most of the racket music a piston engine makes.
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« Reply #14 on: January 08, 2007, 12:17:54 PM »

Kyle:
Funny I can hear the loud pipes comming as well as going.  You are right also that, as in all instances, there are a few idiots that leave a bad taste in everyones mind, be it bikes, cars, trucks, boats, big trucks,  and yes even buses.  Thanks for watching out for bikes.  Yes it is proven, can not qute the statiscits but loud pipes do save lives on bikes.  I can hear a bike before I can see it most times and some of the quiter bikes sneak up on me.  Lets face it bikes are realitive small in comparison to cars and trucks.
Lets all drive safe and therefore be safe.
Thanks
ED
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Ed Van
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« Reply #15 on: January 08, 2007, 03:58:18 PM »

Ed, we could debate this point until the cows come home, so I went looking with a few internet searches to prove/ disprove the assertion that loud pipes save lives. All I found was more BS than I could stand. No proof one way or another.  Shocked

I'll have to agree with the statement that loud pipes do more dis-service to the biker crowd than they help.

Bottom line is that any man worth his testerone can justify ANYTHING he wants to do. I should know, I have 4 scenicruisers! & I can't put any of them on the road by the weekend! We won't discuss the '74 Jaguar XJ12L.

I guess we'll just disagree on this one  Smiley  I hope I don't loose too much sleep over it.  Grin
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« Reply #16 on: January 08, 2007, 06:30:02 PM »

Is anyone familiar with the baffle/spark arrestor that is in a 5" exhaust pipe or it slips in? Will this bring the  the exhaust noise of a  2 stroke turbo engine? I am looking for something as space in my appication is very limited.
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Craig C
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« Reply #17 on: January 08, 2007, 06:37:09 PM »




Bottom line is that any man worth his testerone can justify ANYTHING he wants to do. I should know, I have 4 scenicruisers! & I can't put any of them on the road by the weekend! We won't discuss the '74 Jaguar XJ12L.

I guess we'll just disagree on this one  Smiley  I hope I don't loose too much sleep over it.  Grin

I'll bring my bus over with no pipe to humm you awake Cheesy  
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« Reply #18 on: January 09, 2007, 06:11:36 AM »

Here is what I remember from my motorcycle racing days.
A 4 stroke engine will make more power based on flow of exhaust gas. It pulls flow out of the cylinders for better power which equals better air flow going in. A 2 stroke engine needs back pressre in the exhaust. From a canister in the exhaust The pulses are what create the power in that type of engine. These are for gas engines. I can't imagine diesel being differant.
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Lee Bradley
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« Reply #19 on: January 09, 2007, 10:24:14 AM »

looking for opinions  on running straight pipes on an 8/71. bless me with mechanical facts. Thanks 

Noise aside, LeTourneau built a ton of earthmoving equipment with everything from 2-71s through 12v71s and bigger but almost all of them ran straight pipes until OSHA brought in noise rules.
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« Reply #20 on: January 10, 2007, 07:11:14 AM »

I am running a straight 6" baffled pipe on my turboed 671 still a little louder than I wanted but everyone says its not horrible to be around...gg
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« Reply #21 on: January 10, 2007, 08:53:47 AM »

A Detroit Diesel 2 stroke is commonly referred to as a Uniflow 2 stroke, compared to a scavanging 2 stroke like a gas engine.  On a gas 2 stroke the carbuerator feeds into the crankcase below the piston, then feeds into the combustion chamber by ports, then out through the exhaust ports.  The piston movement creates the pressure/vacuum for the mixture movement.  But with only ports to control the mixture flow, there is alot of exhaust and raw gas mixing that allows raw gas into the exhaust pipe, hence a dirty burning engine.  As compared to the Detroit Uniflow, where the intake ports are only at the bottom 1" of the combustion chamber and the piston covers the ports through the rest of the other cycles.  Because of this design, the piston has no natural pumping action so a blower is used to push the air into the combustion chamber (2-4psi).  Then the exhaust gases exits through the exhaust valves in the cylinder head.  All precisely timed and engineered.  While dirtier than the 4 stroke, still much cleaner than a straight ported Diesel (that would still use a blower).  Like any 4 stroke engine, the 2 stroke Diesel only has limits on restriction in the exhaust, so straight pipes are not a problem.  At least here in Los Angeles, all Fire trucks only have spark arrester resonators so they are loud and people will here them coming.  IMHO, there is no such thing as a too quiet engine.  Good Luck, TomC
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« Reply #22 on: January 10, 2007, 11:12:05 AM »

At Arcadia, I had the pleasure of listening to Pat McNeil's 8V92T. It was well muffled. Pat also balanced & blueprinted it when he was building it. That was a delightful sound. You could hear the internal parts clicking & tapping. Not at all like most that I've heard that were klunking, thumping, rattling, & Roaring. The sound was of quiet authority, & from what I heard from those that caravaned with him, that engine made plenty of power to climb hills & haul a$$!

After seeing & hearing Pat's red Scenicruiser, all I want to do is throw rocks at mine Shocked
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« Reply #23 on: January 10, 2007, 02:12:17 PM »

Guys,

As many of you know I recently played around with this during my exhaust redesign.

Straight pipes-too loud...Way too loud....I am not a noise prude either.

Baffles in pipes-still too loud...I have a set to sell if interested

Designed my own dual muffler setup-NCBob thought it was quieter than his stock setup.

Just came off a 2000 mile trip and she ran great, seemed to have more hill climbing power.

When I ran the first two tests, I pictured myself pulling through the campground....Yikes!

Cliff
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« Reply #24 on: January 10, 2007, 10:22:11 PM »

Quote
Loud pipes saves lives if on a motorcycle

This is a myth that has been around a long time, but somehow will not die. Where is the study that proves loud pipes saves lives? It’s just a convenient way to justify and counter the position of annoyed people that are complaining about the noise. Yes, I ride motorcycles, and I keep the noise down to respectable levels in an attempt to keep the ill will at a minimum. A lot of people rank loud pipes up there with loud rap music. What purpose does it serve other than to say “Hay, look at me!” Second hand noise can be as annoying as second hand smoke. Don’t get me wrong, I like loud cars, loud motorcycles, loud music, and loud firearms. I try not to share them with people that don’t, and with people that will try to push their agenda onto me by enacting laws that would completely ban those activities. My biggest beef is when I am driving with my young children and have to listen to those “gangsta wannabes” play their profane, pornographic so called music (rap) so loud that it makes me want to drown them out with a very loud firearm. If anyone disagrees with me that’s ok. You’re a busnut, and for that reason alone I like you, regardless of how loud your motorcycle is.
« Last Edit: January 11, 2007, 07:16:32 AM by Barn Owl » Logged

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« Reply #25 on: January 11, 2007, 04:53:44 AM »

I wouldn't do it, but I know of people that are nice enough to pour additives in your fuel tank to help quiet down your engine.  Wink

I personally know a guy that was at Lowes Motor Speedway, he quieted down a camper's "contractor" type RV genset with a Natural Lite Beer.

Around here in Rural, Va. they have started ticketing the loud motorcycles. I live in a "Retirement Town" and alot of folks have really started to complain about the motorcycles, the rap artist and the "BUZZ" cars. If the bike came factory with quiet pipes (All did) and the cop feels like it you will pay a fine.

The Blue Ridge Parkway in Southwest Va. is facing budget problems, so I look for that to be the next hot spot to ticket the bikes.

I have had a motorcycle license since the late 70's and I am not convinced of the argument that "loud pipes save lives" , But I'm a gear head and I do love the sound of a well tuned engine. Grin

FWIW,
Dale
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