straight pipes

[kyle4501]

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. 

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    I hope I don't loose too much sleep over it. 

[CraigC]

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.

[NewbeeMC9]

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    I hope I don't loose too much sleep over it.  

I'll bring my bus over with no pipe to humm you awake  

[Green-Hornet]

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.

[Lee Bradley]

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.

[gg04]

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

[TomC]

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

[kyle4501]

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

[FloridaCliff]

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

[Barn Owl]

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.

[Happycampersrus]

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. 

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.

FWIW,
Dale