1991Jeep_Man

What causes most XJ's to sound like they're running diesel engines?? I know about the Jeep tick (the rocker arms I believe is the culprit of that), but what is it that makes them sound like diesel engines? Mine does it, my friends does it, everyone I have met with an XJ does this. No issues with it, Im just curious.

They call me cowboy

?most real diesels are a inline 6? I think it sounds cool, especially if you have split headers and dual exaust

ken72

I think these inhale a ton of air and the cats are a little loud also. There isnt much sound proofing either so the engine is amplified in the cabin also.

1991Jeep_Man

lol, I mean dont get me wrong, I love it. I am planning on gettin a Summit Turbo Muffler to make it seem louder, but I just always wondered what exactly it was. So its just the sound of engine operation?

89Laredo

Jeep engines sound like cummins engines, just not as low pitched:
http://www.youtube.com/watch?v=http:...?v=CCNZfUO0cLY

Kind of a resemblance

93gc40

Because the diesel manufacturers got jealous, and stole Jeeps characteristic sound and performance.

89Laredo

No, its just cause Most industrial diesels are I6, just like the 4.0 and use a single exit manifold, also just like the 4.0.

Mine doesnt sound like a diesel either, all I hear is "KNOCKKNOCKKNOCKKNOCKKNOCK CLACKCLACKCLACKCLACK"
V

firstime00XJ

Because Jeeps only wish they ran off of compression rather than ignition...sigh....No I'm just kidding. Mine doesn't sound like a diesel...maybe it's because it doesn't have enough miles...All I have is a noisy lifter...

91 limited owner

I thought it was odd, you mentioned split headers. They used to make them, for the old Dodge slat six. They sounded great. I've checked the interned, for over a year now. And can't find any company that offers them. Especially for the I-6. "Tri-Flow" was one brand name, I remember. I always wondered, why no one tried them on the XJ. Or mention of them. I guess I'm just dating myself!

89Laredo

The newer cherokees have split headers, IIRC

They call me cowboy

They used to have all sorts of split header options availible back when a inline was more common than a v8, some were 3&3, some were 4&2 which sound real cool. since my 01 comes with split manifolds, when I get some more cashflow, I know a exaust shop who did my exaust for my other vehicles do this jeep. I plan on 1-7/8 to 2" but no larger for backpressure, but the only thing I am unsure of is if I should run a crossover pipe since the exaust only draws from one head as opposed to two on a v or h block. Soon as I get it done, I will post pics and video so everyone knows what it sounds like