straight pipes?

Turbo diesels don't need backpressure from the exhaust, that's what the turbo is for

 

And Wtf is this crap about valve overlap? Your intake/exhaust valves are NEVER open at the same time, and mufflers have NOTHING to do with cam timing

 

My big block Dart doesn't have mufflers, my bike has V&H Big Shots, my boat has straight thru pipes out the back. But these are just old school play toys that get used for a few hours every once in a while. My truck is as quiet as I can get because I'm there for up to 14 hrs straight and a noisey low revving diesel isn't my idea of fun. I do turn and look when an unmuffled truck is on the jake coming into the truck stop. I don't remember seeing anyone else smiling tho....

 

on the contrary. they ARE open at the same time.

don't know about every motor in the world. but most have the exhaust not quite closed yet before the intake starts to open up.

it's not a lot. but there's defenitly some overlap.

the exhaust usually opens up slightly before bottom dead center. and closes slightly after top dead center.
the intake will open slightly before top dead center. and closes slightly after bottom dead center.

so when the piston is at top dead center. the exhaust is almost fully closed while the intake is starting to open.

and before some of you smart alecks come along claiming i don't know what i'm talking about. i used to build engines before retiring for a profession with cleaner hands.

as far as backpressure goes. that's opening a can of worm. cuz most don't agree with the backpressure. they lean on the side of straight flow instead.

i don't mind a rumble. on my harley. on a semi. sometimes it's all right. and other times it gets on my nerves.
throw the jakes on. and forget it. i'd rather park the truck then drive it.

they may be legal from an inspection point of view. but like i said. from a decibal point of view. some states frown on no mufflers. most want MUFFLED COMPRESSION BRAKES.

 

cover your ears if you dont want to hear the noise...

 

I agree.


In Florida there are signs at the weigh stations that say "unmuffled engine braking prohibited"

Personally I believe a turbo diesel needs as least amount of back pressure as possible. Now a super charged or n/a engine would be different. I still believe the op should get straights and let them sing that beautiful sound

 

Go with it man, I ran 7" bull haulers with 7" pickett elbows and no mufflers what so ever for awhile, and as long as your not on the jake its loud but its not so loud that your going to wake up the neighborhood...

To the morons that would ever touch something that's not theirs because of a little noise by your house I guess you should move, makes me just want to drive past your houses at midnight with my jakes roaring because your saying such stupid things...grow up.

Hey Fisher, if you do go with straight pipes, i'm assuming you do have enough common sense to run without your jakes off the highways at night time and anytime your going through small towns or big cities, not because joe blow might come and smash your headlights out but because it will draw less negative attention to yourself.

 

what did you say I could not hear you?

 

Have them put on in colorodo or coneticut. Most shops will know minimum standard.

 

I agree. Just because "they don't like it". My thing is if you live by a highway you should get used to it or move. Just like people who move near rail road tracks or airports and complain about the noise. It's ridiculous and childish.

I live on a state road where log trucks go back and forth a lot. I love the sound of straights though, especially in town when the trucks go through jake shifting or whatever you wanna call it. Sounds beautiful to me. To each his own I know but I'd rather hear straights on a diesel any day.

I can't stand those rice burners with the fart cans on their cars but I don't go knocking on their windows telling them to put a real exhaust on.