3126 330hp Cat muffler

[def]

Originally Posted by jimbo2013

Oil is unknown, just bought this coach, dealer said it was recently changed, the filters are new looking and the oil looks clean on the dip stick.

I change it anyway soon.

You say the oil looks clean.....

Isn't the oil black with the typical diesel engine soot?

My 3126 soots the oil rather soon after an oil change and it changes to black. I use Mobil Delvac 1300 15w-40 year round. My engine has never required the oil to be topped up and the engine is clean on the outside (no oil leaks).

[def]

Originally Posted by FIRE UP

Well,
10.8 is without a doubt, outstanding. Mine couldn't get 10.8 sitting in its parking place right here at home.
Scott

Same here Fire Up.

BTW, last time I fueled was in Ohio. I paid less than $3.00/gallon.

Merry Christmas

[jimbo2013]

Originally Posted by FIRE UP

I'm simply stating the fact that my coach/engine is considerably louder with the Aero installed than it was prior.

Scott, your install looks good, just odd the way they made the pipes go across the whole coach and exit the opposite side of the exhaust manifold that will not be as efficient perhaps.

I wonder if that may contribute to lack of poorer mpg than it could be, but I'm no expert, just a guess.



I guess where we disagree is yours is considerably louder than stock mine is not (considerably)

And "hes4all" agrees on that point

Originally Posted by def

You say the oil looks clean.....

Isn't the oil black with the typical diesel engine soot?.

I know exactly what you mean, my last diesel was like that, this oil is not yet that black......

Originally Posted by hes4all

I have the Aero XL on my ISL 400 and it is louder than stock. I knew it would be by just looking at it. But it is not that loud to where it bothers me and my buddy who RV's with me says he can't hear it when he follows me in his coach.
If it helps with MPG then it was worth it in my opinion?

Agree

Merry Christmas guys

[Iwillbeit]

Originally Posted by CAT2000

Ill take the Cat sounding like its suppose too and better mileage, you want quiet get a gas job! Lol beside at near idle they all sound the same diesel that is! More power!!! Ho ho ho!

No.. I don't want a gas job, I just want a quiet diesel motor. More power is easily achieved by buying a bigger motor to began with. Never understood buying a 4 cylinder and then spending money on all the gadget items trying to make it run with a V8. I guess we all have our different beliefs and ways. You go to your church, and I'll go to mine.

[CAT2000]

Originally Posted by Iwillbeit

No.. I don't want a gas job, I just want a quiet diesel motor. More power is easily achieved by buying a bigger motor to began with. Never understood buying a 4 cylinder and then spending money on all the gadget items trying to make it run with a V8. I guess we all have our different beliefs and ways. You go to your church, and I'll go to mine.

I'm not sure replacing a muffler is spending money on gadget items, it needs one.

Merry Christmas!

[Genset]

From the sound of the replies, seems the only solution is to install two restrictive mufflers, that would help some engines.
Dave M

[palehorse89]

Maybe the answer lyes in post #49 here http://www.irv2.com/forums/f123/2000...-185763-4.html

[FIRE UP]

Originally Posted by Iwillbeit

No.. I don't want a gas job, I just want a quiet diesel motor. More power is easily achieved by buying a bigger motor to began with. Never understood buying a 4 cylinder and then spending money on all the gadget items trying to make it run with a V8. I guess we all have our different beliefs and ways. You go to your church, and I'll go to mine.

Iwillbeit,
I pretty much agree with you Sir. I don't know who's involved in specking out motor homes, chassis specs, and the like but, I too would give a lot for a larger motor, IN OUR SAME COACH!!!! In that 27,000 lb. (curb weight) coach, the CAT C-7 330 HP engine is fine for FLAT GROUND and, even towing our 5300 lb. (curb weight) GMC Sierra Extended cab 4x4, but, when it even SEES a grade, it starts slowing down.

Of all the research I've done, I've only found that Country Coach, Travel Supreme and, Alpine have made what I call smaller coaches, with larger engines. I've seen all three brands, in a 34' with 400 and 450 HP engines. The rest of the manufacturers always under power their coaches, in my opinion. I mean, I've seen 39' and 40' coaches with 330 HP engines. Geeze, talk about under powered. But, trying to squeeze a few more here, a tad there out of an engine that's close to it's peak in HP and torque output already, I'm not sure it's worth the cost.

I do have a friend that has a '98 Fleetwood Discovery 36' that came with the 275 HP Cummins and, he later installed the Banks kit for it and, basically, it's everything I can do to keep up with him, on grades or flat. That kit, on his anyway, made a serious difference. Sure can't figure out why CAT won't accept a kit like that.

[CAT2000]

It's not a bigger HP engine that will get you up the hill it's torque. The ability to move weight at a constant speed not how fast you can accelerate to a speed.

[jauguston]

2000,

Are you trying to tell us that two coaches one with 250hp and one with 350 hp will go up a hill the same speed due to some other factor? I don't think so.

[CAT2000]

Originally Posted by jauguston

2000,

Are you trying to tell us that two coaches one with 250hp and one with 350 hp will go up a hill the same speed due to some other factor? I don't think so.

I'm telling you that It's torque that is the factor and depending on the gear ratio of the transmission and rear end that creates foot pounds of torque to the wheels that pushes you along. It's not HP.

Horsepower doesn't exist, it's a mathematical number from rpm, torque and a constant.

Torque is practical unit, like lbs, grams or miles its measurable, HP is a theory unit, it can't be used directly torque can.

Take a race car high HP gets up to speed fast but low torque can't pull Hugh loads, take a diesel truck low HP high torque huge pulling power. Farm tractor, a 100 HP tractor is considered pretty big and can pull huge implements through heavy soils because of torque.

Just saying!

[Steve Ownby]

Originally Posted by CAT2000

It's not a bigger HP engine that will get you up the hill it's torque. The ability to move weight at a constant speed not how fast you can accelerate to a speed.

The relationship between torque and HP is hard to explain and understand. Torque is a measurement of twisting force and is responsible for acceleration. HP is what gets you up the hill. That's why you climb in what ever gear puts you up at your HP peak.

[CAT2000]

Originally Posted by Steve Ownby

The relationship between torque and HP is hard to explain and understand. Torque is a measurement of twisting force and is responsible for acceleration. HP is what gets you up the hill. That's why you climb in what ever gear puts you up at your HP peak.

HP is about speed, how fast you accelerate, 0-60 time not getting you up the hill, my Cat does not run at HP peak to pull me at 55mph up a grade. If it starts dropping that speed it drops a gear for more torque to push it up. If you have ever noticed tractor trailers with 500, 600 HP engines aren't screaming up hills it's not the HP that gets them to the top it's the torque.

[B D HOWie]

Jimbo2013 said:
Scott, your install looks good, just odd the way they made the pipes go across the whole coach and exit the opposite side of the exhaust manifold that will not be as efficient perhaps.

I wonder if that may contribute to lack of poorer mpg than it could be, but I'm no expert, just a guess.

Jimbo
I am confused by last sentence. Less efficient is better gas mileage??
Paul[/QUOTE]