Once again, you guys are amazing, and so right :) Even if I don't always listen... ;) I was running our coach down some country roads for an hour or so and they were hilly and I just had to take it slow around 45-50 MPH. I initially just left it in 4th on my Auto 740 but I noticed an increasing and increasing amount of smoke out the tailpipe. Just slowly got worse. Engine was definitely low RPM and lugging. Downshifted just one gear and within 4 minutes, smoke cleared and never smoked again that day as long as I kept RPM up a little..not screaming, but no lugging either. At highway speeds, it's no issue, but these things seriously hate to be low RPM lugged! You've always said it, I just didn't get it. Now I do...crazy.
Scott not only does the lugging cause smoke, but also HEAT!
Don't lug that baby! Run it hard and keep those RPM's UP! It's not yer gramma's Escort, it's built to run and RUN HARD!
These are the same engines used in commercial equipment and set to run full blast wide open throttle for days/weeks on end (being shut down only long enough to service them, then back to WOT!)
But please don't try to run granny's Escort this way, or you'll owe her a new car!
;D BK ;D
chuckle. Bryce, someday I'll meet you, shake your hand, and thank you for the many laughs you've given me ;) Truth is, why doesn't an automaker make an engine that can take the beating like a Detroit? As for heat, so it actually runs hotter when lugging? Didn't know that..is that because the hamster cages are spinning slower?
Mazda rx8 or any winkle rotary engine....owned a few and they are happy screaming down the road !
:)
Have fun !
Eric
The heat build up has a lot to do with the extra fuel being dumped into the engine that can't be used properly because the engine can't turn the extra RPM's that it should be able too for the amount of fuel being burnt.
Also especially on a bus that has the engine and radiators in the rear (side mounted radiators) there is no forced air into the radiator like on a truck. So it depends on the fans to pull the air through the radiator to cool it. So the faster the fans turn, the better flow of air and more cooling! Plus less unburnt fuel generating extra heat in the cylinders.
So it's a combination of things. But he bottom line is these engines are designed to run for days on end at the set governor speed with out hurting them. (generators, pumps, and other field equipment do it all the time.)
;D BK ;D
Quote from: ekhedge on June 21, 2012, 11:28:53 AM
Mazda mx8 or any winkle rotary engine....owned a few and they are happy screaming down the road !
:)
Have fun !
Eric
OK so you can drive grampa's Mazda MX8 like that all day long, but still don't try it with gramma's Escort.
;D BK ;D
Kinda surprised that your mighty Allison auto didn't automatically down shift and hold in a lower gear. But that can vary depending upon how the automatic is set up....some down shift real well, others, like yours, need a little helping hand....on the shift lever or button.
Yep....don't re afraid of running your mighty Detroit near or at max rpm for long periods of time....they actually LOVE it. With a 6V92 type mill, 1800 to 2000 rpm for rolling hills sounds fine. Broommm. Brooommm. HB of CJ (old coot) :)
Quote from: Busted Knuckle on June 21, 2012, 11:36:54 AM
Quote from: ekhedge on June 21, 2012, 11:28:53 AM
Mazda mx8 or any winkle rotary engine....owned a few and they are happy screaming down the road !
:)
Have fun !
Eric
OK so you can drive grampa's Mazda MX8 like that all day long, but still don't try it with gramma's Escort.
;D BK ;D
Mazda RX8 is another 2 stroke. :-)
My Old Boss years ago would replace his buses (Prevost and Executive Coach)) every other year and would run the dog out of them. I went with him to a shoot ( trap shooter) to Vegas one year in the early 90's. He got a ticket on the floor at 87 mph out of El Paso. He run um on the floor all the time. 8V92's!
Wow. That's cruising!
Yeah my Allison is stupid about when to shift. So I tell her what to do now. I think you guys might be talking about a Mazda RX-7 which has the Wankel engine in it. (although winkle sounded kinda funny)
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Scott: I have a dumb Allison as well. I do all the shifting, it shifts too soon, and the revs drop too low.
Chuck
I'm glad to hear there are others who do their own shifting.... I thought I was crazy (no comments :) )
I do all my own shifting, keep the RPMs up but never really knew if I was right. Seems it shifts hard too... but I think I remember that being normal.
It's automatic after-all
Dave
You guys need some adjusments doing all that shifting on a 740 I down shifted mine sometimes for the jakes and that was about it
good luck
Quote from: luvrbus on June 22, 2012, 08:19:00 AM
You guys need some adjusments doing all that shifting on a 740 I down shifted mine sometimes for the jakes and that was about it
good luck
Mine shifts too late on a hill, causing the engine to 'lug' IMHO. So, how do I perform these adjustments to improve the performance of the 740?
Quote from: muldoonman on June 21, 2012, 04:30:53 PM
He got a ticket on the floor at 87 mph out of El Paso. He run um on the floor all the time. 8V92's!
Man-Man, with the deplorable condition of America's Highways (Infrastructure) 87 MPH would scare me too death!
You can have that. I am going to stay over in the slow lane and piddle around at 1900rpm and watch the circus in the smart-aleck lane roll on by.
BCO
Quote from: boxcarOkie on June 22, 2012, 09:08:26 AM
Quote from: muldoonman on June 21, 2012, 04:30:53 PM
He got a ticket on the floor at 87 mph out of El Paso. He run um on the floor all the time. 8V92's!
Man-Man, with the deplorable condition of America's Highways (Infrastructure) 87 MPH would scare me too death!
You can have that. I am going to stay over in the slow lane and piddle around at 1900rpm and watch the circus in the smart-aleck lane roll on by.
BCO
I am with you Okie! Low and slow for me. Usually when I am in the bus I am headed to some type of work. I really don't want to get there in a hurry anyways.
Quote from: wal1809 on June 22, 2012, 12:24:10 PM
Quote from: boxcarOkie on June 22, 2012, 09:08:26 AM
Quote from: muldoonman on June 21, 2012, 04:30:53 PM
He got a ticket on the floor at 87 mph out of El Paso. He run um on the floor all the time. 8V92's!
Man-Man, with the deplorable condition of America's Highways (Infrastructure) 87 MPH would scare me too death!
You can have that. I am going to stay over in the slow lane and piddle around at 1900rpm and watch the circus in the smart-aleck lane roll on by.
BCO
I am with you Okie! Low and slow for me. Usually when I am in the bus I am headed to some type of work. I really don't want to get there in a hurry anyways.
A couple of years ago, a friend of mine on a trip in New Mexico said to me, "Hey, if you are in a bus you should not be in a hurry anyway."
And that has kind of stuck with me ... good advice.
BCO
Quote from: wal1809 on June 22, 2012, 12:24:10 PM
Quote from: boxcarOkie on June 22, 2012, 09:08:26 AM
Quote from: muldoonman on June 21, 2012, 04:30:53 PM
He got a ticket on the floor at 87 mph out of El Paso. He run um on the floor all the time. 8V92's!
Man-Man, with the deplorable condition of America's Highways (Infrastructure) 87 MPH would scare me too death!
You can have that. I am going to stay over in the slow lane and piddle around at 1900rpm and watch the circus in the smart-aleck lane roll on by.
BCO
I am with you Okie! Low and slow for me. Usually when I am in the bus I am headed to some type of work. I really don't want to get there in a hurry anyways.
I am with you guy's also.
With only about a 1' between me and anything stopped, I prefer to give every advantage to my reaction time.
Enjoy the scenery, so to speak... ;)
Cliff
Yeah BCO, Off topic but he screamed those poor things. We had a mechanic that would turn um up and I think he ordered the tallest gear they would put in from Prevost. I wouldn't have bought one from him. He also bought the bottom stainless pieces around coach and doors and rivets by the buckets. Everytime time he would get back in they would pull it in and fix something. I think the biggest problem was that damn scotch. He's passed on now but he was sure good to me. Worked 18 years for him.
Way back in 1970 at Yosemite National Park, the propane powered tram tour tractors had 413 Dodge industrial V8 engines running thru the old MT42 6 speed Allision. All of the drivers had to manually shift the tranny as they had not been set up properly to hold in the correct gear. Easy to do.
Management didn't want to pull the Allisions and revalve them and they were OK with us manually shifting. Top speed towing was 25 mph. We would come down from Mirror Lake in 2nd gear....very slow. Anyhow, long ago and kinda far away. Wish I was 20 again. HB of CJ (old coot) :) :) :)
I'm with Clifford, rarely do I feel the need to override the 740 in our Eagle. She seems right on time.
Engine that can take high rpm's? Cadillac's Northstar was tested at WOT for over 100 consecutive hours. Just watch out for head gasket problems.
Quote from: muldoonman on June 22, 2012, 02:55:52 PM
Yeah BCO, Off topic but he screamed those poor things. We had a mechanic that would turn um up and I think he ordered the tallest gear they would put in from Prevost. I wouldn't have bought one from him. He also bought the bottom stainless pieces around coach and doors and rivets by the buckets. Everytime time he would get back in they would pull it in and fix something. I think the biggest problem was that damn scotch. He's passed on now but he was sure good to me. Worked 18 years for him.
No longer feeling "the need for speed" I can relate to what you are saying. There comes a time when you simply tire of replacing items on your coach that high speed and bad road took from you.
Not to mention the expense (Eagle parts are not cheap).
When I was young, I could drive from Oklahoma to the West Coast and pick up enough tickets to wallpaper my garage, but now I am just another pokey Okie in the slow lane.
BCO
You guys that don't like to run need to stay out of Texas, El Paso to Junction is 85 mph now TDPS will give 5 mph over there is 90 mph.
For you guys that like the scenery not very much out there to see lol,
I always ran the 80 mph across that part of Texas to the first BBQ place at Junction
good luck
I don't know if I could afford to feed the frenchy-bus for a 90 MPH run and still have enough left over to buy BBQ but I'd sure like to try.
I know with my V730, I'm shifting manually all the time. Especially when I'm going up a long grade in first-I shift down to first to get the torque converter to lock up and put out less heat (about 32mph). Good Luck, TomC
Lol! I'm all about fuel conservation these days ( who isn't?), but it is good to kick it in the ribs and blow the crap out on the interstate ;) Don, let that baby fly every so often, cause It'd feel awfully strange, me passing you on the big I. ;D
Pardon my black smoke ;D
I heard they were talking about the 85, Clifford. I can't wait until we are back down that way. Look out. We will be rolling 85 (or wide open). That will be awesome.
John
Quote from: van on June 23, 2012, 07:39:42 AM
Don, let that baby fly every so often, cause It'd feel awfully strange, me passing you on the big I. ;D
Pardon my black smoke ;D
Our last trip to Houston, I was actually passed by a garbage truck just outside of Dallas. I looked at my bride and said, "this is so depressing."
Bring it on. Texas is building a highway right now, with tax dollar funding, using a Mexican company and they are going to put 85 mph on it. First one in the nation from what I understand ... high speed toll roads ... what is next a Hawaiian in the Oval office?
I don't do smoke any more Gunner, y'know that.
BCO
Cliff, tis true, my 740 is in a hurry to get to fourth gear and she does it at the expense of acceleration. It's always done that and apparently I'm not alone. In an effort to prevent hours of lugging, I'll downshift if I'm doing 50 on a back road. She seems to like it. On another side note, it doesn't hurt any to downshift when slowing does it? Helps save my brakes
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