do I need a muffler?

[polarweasel]

Does the muffler serve any spark-arresting purpose on a diesel the way it does on a gasser?

My Mercedes 300D (5-cyl turbo) currently has no muffler (rusted and fell off!), and it sounds acceptably quiet. I assume the turbo is doing the muffling. If I don't actually need the muffler to prevent forest fires when I put the engine in my 60, I'll just run a straight pipe...

 

[cruiser_guy]

I have NO muffler in my '82 BJ60 with the AXT kit, my daughter (who works in the B.C. Forest Service) has NO muffler on her '76 FJ55 with the 3B and turbo. Frankly, I don't see the need for a muffler after the turbo on a diesel but without the turbo yes, you need a muffler.

 

[polarweasel]

Cool. That's exactly what I wanted to know... the exhaust system just got cheaper.

Incidentally, the turbo appears to serve the function of spark arrestor as well as muffler, according to this. Hell, if turboed diesels don't need spark arrestors in the presence of gasoline vapors, it seems unlikely they'll set grass on fire.

 

[cruiser_guy]

Just make sure that you allow for ALOT of expansion in the pipe. I think mine expands as much as 1" from cold to warm. It busted an anchor shortly after install due to expansion.

 

[Tapage]

Note: turbo function as a muffler in all cases, your naturaly aspirated engine sound more loud then a turbo engine without muffler.

No other issues involved in no muffler system.

 

[VTCruiser]

i ran my 1HZ with NO exhaust system (and no turbo) from the manifold back (on the way to the exhaust shop) and it wasn't really that bad. Noisy, yes, but not at all like my friends olds 455 with no exhaust, you can feel that ting thump in your chest. The 1HZ was rather loud under deceleration though.....

 

[Gold Boy]

UUmmm interesting... I think I will get a pipe bender and do my own exhaust, pipe benders are real chaep at this place http://www.princessauto.com/PAcountry.cfm?CTRY=CAN&INF=home

GB

 

[brownbear]

your link is no good. it just goes to princess, not the bender. I tried there search I could not find the bender. pls post what you found, I may want one!

 

[Diesel Dude]

I got one of those pipe benders from there I strongly urge not getting them they dont bend in a tight enough radius to do much good, they also kink the pipe instead of a nice bend. I found it worked on thick wall pipe, but with the big radius it still wasnt much good.

 

[Gold Boy]

UMM just an idea, looked like a good one.... Oh well next time. Product #3460020 at princess auto...

You used this set?

GB

 

[Canuck]

When my muffler cracked on my old BJ70, I had a Flowmaster welded in. It was quieter than without a muffler but it was loud enought that I got looks when driving in the city.

 

[Gold Boy]

What series flowmaster muffler was it?

Thanks

GB

 

[Canuck]

It was a standard Flowmaster muffler (not stainless) with 2.5 inch in and out bought from Lordco.

 

[VTCruiser]

i would avoid any chambered mufflers for turbo applications. I will most likey run a SS magnaflow.