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  #1  
Old 08-07-2003, 11:14 PM
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í84 300D Turbo: extended 80-90+ MPH cruising?

As durable as they are, I donít want to blow the engine; itís turning at pretty high revs in that speed range. Any thoughts (other than legal ramifications)?

I won't let the temp guage get too much higher than normal running conditions (82-85 Celcius), but what about using a thicker oil due to the heat stress?

Thanks In Advance!
Glenn

84 300D - 226,000+ miles
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  #2  
Old 08-07-2003, 11:30 PM
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My 83 TD likes running at 73-78 mph.

Once I ran her approximately 125 miles, never dropping below 85 and traveling at 90+ most of the way. On that trip I experienced what I believe to be a lot of misting of the oil which overwhelmed the separator and flooded the air cleaner housing.

For a week after that trip, I had rough starts and a lot of blue smoke for 45-90 seconds after start-up. I guess overnight the excess oil was draining into the turbo housing or being sucked into the intake tract. Once that excess oil had been consumed, the smoking quit and the starting was easier too.

Now, I limit my extended high speed travel to <80 mph. Anyway, it's about as fast as I feel comfortable going on the roads I drive.
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  #3  
Old 08-07-2003, 11:42 PM
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I brought my '83 from Houston, TX to Michigan at speeds of 85-90 in a straight trip. It touched 3 digits from time to time and seemed to be very happy up there.

I often run trips of 500-600 miles at heavy speeds. I have never noticed any adverse mechanical issues.

Don
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  #4  
Old 08-08-2003, 12:35 AM
Orkrist
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I haven't had any problems either. I've driven from K.C., MO to St. Louis, MO and back a few times, cruising at between 80 and 100 for almost 4 hrs each way. One time I was actually passed by another 300D turbo with four people in it. Its not something I would do all the time, though. Other drivers make me more nervous than the car, which has not given me any mechanical problems in 9 months.

When I frist bought the car I posted regarding the revs, which do seem high. If I recall, its around 4K at those speeds, and I think the cut off is 4250. But, I used to cruise my little MGB-GT at over 4K for hour after hour (no OD), and I seem to have heard these diesels like the revs. I've noticed after prolonged highway driving my diesel runs better around town, too.
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  #5  
Old 08-08-2003, 02:09 AM
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Quote:
Originally posted by Orkrist
If I recall, its around 4K at those speeds, and I think the cut off is 4250.
I think the governor hits higher than that. If I floor the throttle, the engine'll get up to 4500 RPM between upshifts, and I've heard that it can go as high as 5500 RPM, although "m not sure on that.

I know that I've got a taller rear end gear ratio, but I'm at 3000 RPM even at 70, and I do'nt think I've ever had it up to 4000 RPM except for while accelerating. My car wants to do 80, but I can't afford the ticket...
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  #6  
Old 08-08-2003, 06:20 AM
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They will go fast enough to get you a brief chat with officer Friendly; I'm working on that issue right now.

But, don't fear the revs. These aren't long stroke engines, they want to spin....plenty in here on that subject.
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Old 08-08-2003, 06:38 PM
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i ran my 84 300d turbo from fla-ct earlier this year (1300 miles) at mostly 80mph with no problems or additional oil consumption. it seemed to like that speed a lot (so did i, hehe )
in fact it got better mpg than at slower speeds
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  #8  
Old 08-08-2003, 06:45 PM
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Quote:
Originally posted by Orkrist
I haven't had any problems either. I've driven from K.C., MO to St. Louis, MO and back a few times,
hey where do u live? i live in Columbia, Mo
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  #9  
Old 08-09-2003, 02:30 AM
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don't forget to let it idle for a few minutes before every shut down at those speeds unless you carry a spare turbo.........
William Rogers.......
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  #10  
Old 08-15-2003, 12:30 AM
Orkrist
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To ned2683

Ned,

Yeah, I live in K.C., MO, going to UMKC law school. I visit St. Louis every once in a while. Talk to you.
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  #11  
Old 08-15-2003, 01:24 AM
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It's my understanding that diesels like running at fast speeds for extended periods. I've never had any ill effects of running mine up there.
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  #12  
Old 08-16-2003, 01:26 AM
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hey!! im from bethany mo. work in k.c. mo. drive my 85 300D 200 miles round trip 5 days a week, 310k miles still running strong!! who else is from missouri???????? maybe we should get together sometime!! maybe meet at hooters for wings!!! hehehe
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  #13  
Old 08-16-2003, 02:20 AM
EdV
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It doesn't hurt a diesel one bit, instead it is good for you to run it hard once in awhile to clean it out. I been a heavy equipment repairmen for 25yrs. Had a Perkins diesel in my Chevy 1ton in 1970, ran wide open most of the time for my to hit freeway speeds. Will run funny for a short period as it cleans out the cylinders. Slight upgrade best place to do it, keeps you from getting speeding ticket.
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