Chrome Stack

Don't understand how too large on a diesel will impede torque.

Case in point...OTR 18 wheelers. 2 Straight pipes; exhaust system of choice; minimum restrictions. I can remember yaking on the radio, during my truckin days, and guys would talk about (illegally) taking their mufflers off and going to straight pipes to improve their ability to climb certain grades. Talked about the improved pulling capability....

Also, as the case with my 2430. Why did the engine mfgr put a 3+" dia outlet on his exhaust manifold if he didn't want it to breathe.

Thinking..... ..... ..... ..I'll answer that. Because he uses this engine on the 2440 where it has a turbo sitting on top of it and the turbo definitely wants reduced back pressure and high volume.

Ok, so now we are back to non turbo performance vs turbo and free flowing exhaust vs restrictive.

Not the expert, just kicking thoughts around and looking for the right answer....course I already have the right answer. My 4010 has a straight pipe and runs like a scalded ape....like to hear it growl...thru my earplugs of course. Ha!

Later

Mark

Thought it was restrictive as you could put your hand in the exhaust outlet at pto rpms and it was a solid stream of gas. Took the muffler off and the inlet was over 3" and I thought..... who's foolin whom.

The manufacturer of the engine (one Deere engineer) decides that proper breathing for the engine is 3+ inch exhaust, and another Deere engineer decides that he is going to make the tractor quiet so he strangles the engine to quieten it down.....but it didn't do much good; still was loud.

Since the engine is running hotter than I want it to, under pretty good load with the A/C on, and all the other things have been tended to, the only thing left was restrictive exhaust to contribute to engine heat.

Tried to get a muffler for a 4240 as it had a larger outlet but the muffler mfgr suggested a straight pipe instead.

So yesterday UPS stops by and drops off a beautiful straight chrome stack that is the same diameter all the way as the hole in the exhaust manifold (over 3") and 50 something inches long with a flange on the engine end. Put it on and it looks great sitting in front of the cab.

Cranked her up and it was loud, but not that loud and the soundguard cab blocks a lot of it, plus I wear ear plugs anyway. The engine it'self makes as much noise as the exhaust; especially the fan. The sound is good and solid and the pipe is less vision restrictive than the muffler.
So now at PTO rpm's I put my hand in the exhaust and I feel pulses..... YEAH! We're breathing now.

Can't wait till I can get a load on her and see if it does the job. I'm saving the old stuff in case I have to go back for some reason.

My 2c

Mark

Did you ever have your single exhaust pipe on your p/u removed and a pair of duals with glass packs installed....if so you have your answer.

Why? Cause you had goesinna, but no place for the goesoutta. What goes up must come down, and what goes in must come out..... if your gonna keep it running. The easier it breathes, the better it runs and that translates to cooler, more efficient running, which results in more power and efficiency.

Mark

BUDD