Quote:
Originally posted by MvdB@Feb 9 2005, 03:48 AM
Does anybody have good advise on what kind of RPM to drive on a BMW 525TDS to keep it alive as long as possible? I have bought a 525TDS touring '97 with 250k KM on the counter.... and want to have at least some 2-3 years fun from it. So far it has been great, it looks really good, of course! and was really well kept by it's first owner.
I was owning a Opel Vectra 2 liter Diesel before, which I used to drive at between 2k and 3k RPM, which I consider very sweet on an engine, but still it broke down on me in the end..... (for the rest was actually a pretty nice car though, but of course no match for the current one*  * )
Of course I understand warming up the engine is very important, but can low RPM rates be harmfull for an engine also???????
Considering that on the Dutch highways, where I live (not on the highway), 120Km per Hr is the max speed, in fifth gear the car is only doing 2,5k RPM....*
I have already trashed 3 engines in about 5 Years, so I am getting very frantic about this.... I have bought this BMW despite it's high mileage (have to consider budget also) because first of all it has always been my dream to drive a BMW, and second of all, I believe this is one of the strongest engines around....
Any help to prevent me from turning my BMW dream into a nightmare would be very helpfull......
Thx in advance for any advise.....
Michael van den Berg
The Netherlands
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Michael
to our board and BMW diesel is not too famous here due to the relatively US low gas prices compared to Europe's. The following is a basic tech discussion and I am sure many of our members will explain it in further details.
So forget about the difference between diesel and petrol engines performance for a minute or two and look at the bigger picture of RPM/HP and TORQUE. If you car has high HP engine with low TORQUE you still can go 120 km per hour, the catch? You have to wait for a while. To the contrary if your diesel/gas engine has high torque with low HP you still can accelerate very fast from the start, the catch? You will not get to a very fast speed.
Now based on the above I rather to make—ideally speaking- Torque at the higher not the lower RPM; this is due to the gearing factor since it can be manipulated. Implicit in this argument, thus, speed/its rate is defined by torque. You may ask what about HP? Why engines are rated by HP? Before quitting here I’ll pause with the following point for further discussions:
Too many HPs will make engine rev fast and it will make plenty of high torque. This is true regardless of what car/engine we talking about. Your thought?
Regards
billb
