Engine Hours v.s. Mileage

luvrbus · February 18, 2016, 04:06:24 PM

At the reddi mix plant back some years I had loaders and generators with the 6L71 engines the loaders were started at 6 AM and would never be shut off till 6 PM and idled about 1/2 the time in a day.I could get on the average of 7000 hrs life from 1.Then the generator running @ 1800 rpm with a load the engine life was over 10,000 hrs sometimes over 12,000 hrs fwiw

TomC · February 18, 2016, 04:23:00 PM

When I was driving truck, I had an 8ft drom box behind my 90" cabover (only 235" wheelbase). It had a 6.5 Onan Emerald III gasoline commercial generator with a PTO shaft out the rear of the alternator that ran my air conditioning compressor for the sleeper A/C. It never made sense to run a 500hp Diesel to maintain a 5hp air conditioning compressor, or to keep the cab and engine warm. I have an electric block heater I ran all the time so that the generator always had at least a 1,500 watt load on it at all times. Because of this, my gasoline generator lasted 12,000 hrs before giving up the ghost-and that's without ever having either of the heads off for decarboning.

With modern Diesels now using DEF, the more you idle, the more manual regeneration you'll have to do. I sold 20 trucks to a market chain. They start the trucks, then drive across town on the freeway early in the morning, so they are up to speed. Make deliveries with the engine off, then drive back to the yard in mid day, so again they are up to speed (most of the time) on the freeways. I inspected one of the trucks with a DD13-it had 265,000mi on it, had not had a single manual regeneration yet, and you could still see the inside bare metal of the exhaust pipe. Truly clean burning these new engines. Good Luck, TomC

azdieselman · February 19, 2016, 03:55:24 AM

Tom, You are correct about the clean tail pipes. Actually, They're considered part of the emissions system and can't be altered. (Body fitters love that)

The emission enforcement agencies will catch on to this one day, DPF equipped
engines must have a clean tail pipe. If not, Then the DPF is damaged or removed. No visible smoke, This can make engine diagnostics more difficult. Sometimes it's necessary to drop the exhaust to see if there is smoke. The DPF is often referred to as an exhaust filter, And it is. It is a true air filter.

DEF has nothing to do with regen or clean tail pipes. It's only there for NOX reduction. I'll guess you knew that, But there is SO much confusion about exhaust aftertreatment.

luvrbus · February 19, 2016, 04:49:41 AM

These new engines burn clean you can tell by the oil,I do work for a casino that owns 2 J4500 with DD 13 engines at 35,000 miles or 1850 hrs which comes first the oil is changed. You can drain the oil and it's looks new and they could go to 50,000 miles between oil changes if they choose, it's amazing that would be 5 oil changes for a 2 stroke engine each time it would be totally black.The filters are a PITA to change though on a DD13

Scott & Heather · February 19, 2016, 05:27:59 AM

So when cliff says his generator engine at 1800rpm lasted 12,000 hours what might that loosely relate to in miles if that engine were run at 1800 rpm in a coach?

Don Fairchild · February 19, 2016, 05:28:59 AM

(diesel particulate filter) DPF. I can show you a couple of Pete's running 8V92TA's that the pipes are as clean as the day the were installed. No exhaust filter. I do agree about some of the new engines. Az how you doing you staying busy.

Don

luvrbus · February 19, 2016, 05:37:20 AM

Scott, DD uses 39.97 miles per ea engine hour they should have it figured out close in 75 years you would think,but that was before Bus boards and the internet

uncle ned · February 19, 2016, 06:19:20 AM

Don how are you doing and are you staying busy.

Are you ready to make HUGGY run that clean. But then I would have to cancel all my mosquito killing contracts.

Look forward to seeing you soon.

ned and wilma

Don Fairchild · February 19, 2016, 06:39:08 AM

Ned how are you and Wilma. No i am not busy, when do you want to clean up your act. lol

Burned up the engine on mine so I need to get the money to fix it, I will use the CCTS parts this time around

Don

azdieselman · February 19, 2016, 07:29:27 AM

Quote from: Don Fairchild on February 19, 2016, 05:28:59 AM
(diesel particulate filter) DPF. I can show you a couple of Pete's running 8V92TA's that the pipes are as clean as the day the were installed. No exhaust filter. I do agree about some of the new engines. Az how you doing you staying busy.

Don

Hello Don, I'm doing well, Hopefully you are too. Vehicles come in waves. 6.0 & 6.4L PSD and EGR IH's keep me busy. So much mis-information and misunderstanding of system operation.

Many years ago, I was working at a shop with a dyno room. Something failed on the test engine and filled the room with heavy smoke. There was an 16V149 set up to run later, The operator fired it up and within a few minutes the room was clear. Those things move some huge amounts of air.

luvrbus · February 19, 2016, 07:55:20 AM

Sure the old 2 strokes are going away 3 years ago a million + were still in service MTU says now there are around 250,000 world wide still in service.
Texas is going after the 2 strokes they are paying boat people to up grade to 4 strokes even the Hoppy and Sterling ferries at Lynchburg Texas are now 4 strokes, the old 6L71 have powered those since 1964 when my hair was brown.
I rode those twice a day for years listening to the sound of the 2-6L71 N/A and drinking a cold one moving you across the Houston Ship channel it's not the same now,every time you see a Stewart and Stevenson service truck they have a John Deere marine engine loaded headed for some type boat it's sad

Scott & Heather · February 19, 2016, 08:47:37 AM

I am happy to note that I own two of those 250,000 two strokes

And I own a 6v92 genuine DD parts in frame rebuild kit. Now if only I could just buy two more cylinder kits from DD and make it an 8V92 kit

TomC · February 20, 2016, 02:45:18 AM

It is ironic that both the largest and most fuel efficient engines in the world are 2 stroke Diesels used in Container ships and for generating electricity. The newest version of these engines have a bore and stroke of 39" by 135" (yes that is a stroke of over 11ft!). But only run at 82rpm max. If you look at these giant engines, they are uniflow engines just like the old Detroits. Course if the Detroits had the same stroke as these engines they would need about a 17" stroke, compared to the 5" stroke they have now. If Detroits had common rail electronic fuel injection along with the Catalytic converter, DPF and DEF, I bet they would be just about as clean. Course, you'll notice too that the 2 stroke EMD locomotive engines are no longer available in the states. It is too bad-nothing like the sound of a 2 stroke Diesel-no matter what the size. Good Luck, TomC

Don Fairchild · February 20, 2016, 05:59:34 AM

the two-stroke engine has always been the most efficient engine in the world. If I could get the money I would bet that a common rail and a doc wold make these engines cleaner than the four strokes and use less fuel.

Don

belfert · February 20, 2016, 04:33:48 PM

I went on a three week bus tour in my teens in 1989. The bus was definitely MCI and probably an MC7. The bus spent a ton of hours idling on days we were not on the road. One state out East did not allow idling for over 10 minutes so the bus had to be shut off. Man did the bus stink inside from the bathroom because the bathroom vent fan was not running when not idling.

(I don't envy the person who had to clean that bus when it got back from three weeks with 40 teenage boys. The aisle was lower than the seats and was so sticky by the end that we had to walk up on the edges of the seat platforms. It was a Boy Scout trip so I don't know why the leaders didn't make us clean it.)