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Engine Discussion of preventative/corrective maintenance and other technical issues regarding your coach's engine.

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  #1  
Old 02-19-2010
chuckd chuckd is offline
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Join Date: Feb 2010
Location: Stillwater
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Default 6V-92 Driving style

New guy with the Prevost here, and I have read many posts about the care and feeding of the -92 motors, one of them being from Randy where he said to run it like you stole it, or something to that affect.

Well in my days of youthful indescrestion (sp) I had a choice, steal cars and give my buddy's rides or chase girls. I chose the latter, so I have never stolen a car, sigh. Not sure what it means to drive it like I stole it, so some questions:

What is the not to exceed RPM limit?
What is a good cruising RPM (presently 1600 at 62mph)
Why can it not be idled for a long time?

Thanks in advance

Chuck

1979 Prevost 35 foot
1999 Volvo 770 pulling a New Horizon fifth wheel
Stillwater Mn
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  #2  
Old 02-19-2010
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Ernest Ekberg Ernest Ekberg is offline
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Chuck, I try not to go above 2100 rpm. 62 is a good speed and rpm. You can idle the engine if you have a high idle switch. That gives her more oil circulation.
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  #3  
Old 02-19-2010
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sfedeli sfedeli is offline
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Chuck- I run mine wide open. Pedal is on the floor most of the time (unless it results in a speeding situation). Our BB is geared for around 55 (because of when it was built), so it has a top end around 75 at 2150 RPM's. Watch her on the downhills- she'll want to run away and the danger mark is around 2300. When climbing- do not let the tranny lug you down under 1600 RPM's. As soon as you get there, bump it to the next gear down. Try and stay around 1900-2000 RPM's when climbing hills. In town, better to put her in a lower gear, like 3rd or 4th instead of letting it shift in and out of gear. Alot of the small towns have a speed limit of around 35- so I'm usually in 3rd until I get outta town.

The idling thing has to do with the nature of a 2-stroke engine. They are filthy beasts at low RPM's and will spew oil and fuel into the airbox at the bottom of the cylinder. You'll find nice, big puddles of black goo on the pavement when you idle them too long. Try looking over this website- They have alot of nice tips for driving the two-strokers: http://www.tejascoach.com/tejasoil.html#Drive
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  #4  
Old 02-19-2010
Jim Harvie Jim Harvie is offline
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Idling at 1000 rpms, will also give the turbo some extra lube. The "V" block has a short stroke, therefore the higher the rpms, the better.
There are two positions on the throttle of a 2 cycle detroit.... "Off" and "On". When you see a hill comming... gouge on the hammer, and even if you foot has an itch, don't let off even a little, or you'll lose the momentum.
I'm with Randy on this one. Drive em like you hate em!
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  #5  
Old 02-19-2010
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Many, many years ago I drove a 2 cycle Detroit powered Kenworth with a 16 speed transmission delivering asphalt and the company owner told me the best way to drive it was taken in steps;

1. Approach truck on drivers side.

2, Open drivers door.

3 Insert thumb of right hand in door jamb.

4.Slam door closed on thumb as hard as possible.

5. Open driver door as quickly as possible.

6. Step up into cab of truck and sit in drivers seat.

7. You should be angry enough at the tuck now to properly drive it for the remainder of the day.

8.Tommorrow repeat procedure all over again.
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  #6  
Old 02-19-2010
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Randy Dupree Randy Dupree is offline
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hahahaa!! Johns right,the old saying was to slam your finger in the door and get busy!
All engines have a sweet spot,none have the same sweet spot,but you will know when you find it.
A 35' Prevost with a 6V92 should be a sweet runner!

Shane,some of the 6V92 pts came with a 3.31 rearend ratio,those puppys will really run,I think my golfing buddy Ed Wimberlys PT35 has the 3:31s in it,yours must have a 3:73.
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  #7  
Old 02-19-2010
chuckd chuckd is offline
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Thanks guys, I think I may keep my fingers out of the door at least not do it on purpose, when I pick it up on Friday, I will be able to play with some speeds and RPMs on the way home. 360 Miles of highway 90 for those of you who don't travel above 10, the country side will be white.

Chuck
Stillwater Mn
1979 Prevost
1999 Volvo 770 13spd, with New Horizon fifth wheel
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  #8  
Old 02-19-2010
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Ed Wimberley Ed Wimberley is offline
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Yes
6V92 with 3.36 gears Rev limit set at 2300 on the tach????accurate????
runs out at 78mph on the flat checked with GPS 5mpg with Generator also running,thats the 82 35'

84 40'???? got 3.73 gears will have 6V92 with 350hp someday

Thats golf ball hahahaha
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  #9  
Old 02-20-2010
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Gene Mehr Gene Mehr is offline
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You forgot to hang youre hat over the gueges, Then its all good. I was told to run them hard thats what they like and I have never any trouble
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