engine rpm

[Cummins Cowboy]

when i make long road trips i like to sometimes kick up the speed a bit on the highway. Most of the time i like to run about 80-85 mph. 85 mph in my truck=2500rpm and 90=about 2700rpm. Do these high rpms in anyway effect the longevity of the engine??? does it hurt to run the truck wide open 2800rpm for an extended period of time??? Because it seems to me the engine feels like it runs the best right at 2000rpm. all of the trips are bob tail with no load on the turck.

------------------
93 D250 5sp 3. 54 gears sans muffler, ISSPRO tach, K&N filter, needs to be bombed BAD
I would rather be cummin than stroken

 

[BushWakr - RIP]

My manual says the that the minimum max. governed RPM should be no less than 2850 and the maximum max. RPM should be no more than 2950 RPM. Right now with no load and WO in 3rd I see about 2880 to 2900 before governor kicks in.
Hope that helps.

Regards, Bush'

------------------
93. 5 D250 4X4,HD Spring Pkg, Rancho 7000's, Rear Swaybar,Dual Shock Front Stabilizer,BD Injectors,31/2" Mandrel bent exhaust,16cm 'Hot End',Modest Pump Tweaks/Timed,K&N Air,Isspro Pyro,Tach,transmission Temp,Auto Meter Oil Filled Boost Ga. , 3:54's, 4 Speed Auto, Clubcab, Aftermarket Reclining Buckets w/ctr Drop Down seat/console, Black over Silver, 21psi,285-65R-16's,American Racing Clear Coat Mags, Amsoil 15W-40HD Marine,12,000 lb. Warn Winch,KC Spots. 97,000 Kms.

 

[Alan Reagan]

IMHO it doesn't hurt the engine. I drove an old 290 Cummins for years and pretty much ran it flat out on the interstate. The mechanic said that Cummins engines are designed and governed to stop people like me from hurting them. He used to refer to these engines as "bulletproof". I think he meant "ideot proof" when he was talking to me. Anyway, that 290 ran over 400,000 before she got overhauled and became a logging truck in Georgia.

 

[ScottB]

I read in a cummins brochure that they set up the 5. 9 in RVs to run around 2500 because thats the sweet spot. If you ever notice that at 2500 if you nail it, its got instant response. I don't think that lots of high rpms do a motor any good however I don't think you'll have any problems. You should consider adding a overdrive such as gearvender if you are gooing to do a lot of interstate running.

------------------
93 W350 5spd White 3. 54 gears 4" stack Powerwagon Injectors. Headache rack with lights. Cummins Mudflaps. 2" lift on seat. Goosneck ball Beefed up reciever. Fog lamps, Back up lights. CB 98 Factory sound system

 

[Bob Beauchaine]

Howdy cummins cowboy
Cummins says you can run against the governor all day long and it wont hurt this engine. I remember reading this right after I bought my '93 in '93.
Happy trails

------------------
1993 250 4X2 - Banks Power Pack, BD Power Injectors, K&N Air Filter, 6 gauges and tweaked pump. 27lbs boost unloaded.
Horton fan & NV4500 5 speed.

 

[DJP]

The only bad thing about running above 80 mph for a prolonged period is you will notice a substantial decrease in fuel economy. I used to keep my right foot mashed to the floor when I was running I-10 from Long Beach to Phoenix every weekend. Gotta love them hills outside of Indio when you got gobs of torque.

------------------
89 D-250 LE 5 speed 3. 55 Limited slip, K&N, Full Boar Muffler, 3" exhaust, Diesel Dynamics Stage 1 kit, Boost/Pyro. & 16cm2 215K miles.

 

[Cummins Cowboy]

yeah when i run that fast i really do notice a big drop in fuel mileage. The engine also sounds like it is really winding up. I usually prefer to let the motor purr so to speak. I just wish i had another gear. when running mostly 60-65 through the mountains i have gotten an all time best of 23 mpg. but mileage quickly drops off when speed go up.

------------------
93 D250 5sp 3. 54 gears sans muffler, ISSPRO tach, K&N filter, needs to be bombed BAD
I would rather be cummin than stroken

 

[mark93]

Hey guys.

I really like the sound of the engine at 2500-2800 rpm cruise. To me, the smooth drone (like an aircraft jet engine) from that mean, lean, oil burnin' machine is exactly what an engine should sound like.

------------------
'93 W350 Club Cab, Bright White, 5 sp. , 136K, Factory Options: LE package, 4. 10 Limited Slip, 7600 lb. rear springs, tachometer, front stabilizer bar. Mods: Banks stinger plus, Linex bedliner, 25,000 lb gooseneck ball, 10,000 lb receiver, Tekonsha brake controller, POWER WAGON injectors-WAY faster than stock!.

 

[Gary - K7GLD]

TWO things - first - if you want to run higher road speeds, but also want the availability of lower gearing for pulling, consider the addition of a US Gear or Gearvenders OD unit - that way you get the best of both worlds PLUS the ability to split gears in the hills if needed.

SECOND, these engines are BUILT to be used in commercial/industrial use, where they run up against the governor 7/24. Next time you see a diesel backhoe or similar, notice that the engine is operating at its max RPM STEADILY as it does its work... Like the guys said, IF you can stand the fuel consumption #ad
#ad


------------------
http://community. webshots.com/user/davison71 Early '91 250, 727 AT, 307 rear... Banks Stinger exhaust, intercooler... US Gear OD... MORE than a match for every new PS Ford encountered so far...

 

[Wirenut]

I just wish I could afford one of those OD units! #ad
I can't even afford to change the oil right now!

------------------

• '93 250 LE 4x4 5spd 4:10 Loaded,dual 5" chrome stacks,12cm² turbo(37psi),PW injectors,K&N,pyro/boost,US Gear E-Brake,tool box,CB,10" AR rims, 285/75/16 Bf goodrich. "wirenut_21529" on Yahoo Messenger
• '97 Ford B-Series school bus (5. 9 Cummins!)I'm gonna Bomb it!
• '94 GMC 2500 6. 5L Turbo

PICTURES.