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Showing results for tags 'engine longevity'.
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I wanted to start a discussion with those with mechanical minds, and hopefully not have it become an argument. TO THE INTERNET!!! My little poor old 4k is on its last legs until its rebuild which should happen beginning of next year. To keep oil pressure up while driving over the mountains, when it all gets hot, ive had to add an oil conditioner product which did exactly what it claimed to do. I put in 3 litres of new mineral 20W-50 and stuck in about 300 mls of this additive stuff. without the additive, my cheap gauge wasnt registering a thing driving up hills all the way to about 3500 rpm. After putting it in, i was getting some oil pressure back and that has got me by. It has got me wondering what peoples opinion is of driving with oil pressure problems. Pretend you were on mars, and in order to survive you had to make your 4k powered mars rover get you back to the base station 2000 km away. If you damage the engine you will be left to die. Would you feel better driving at higher RPMS and actually seeing some oil pressure, or would you take the mentality that lower rpms generate significantly less heat in the main bearings? I'm stuck on this. My thoughts: Lower rpm means more pressure on the bearing at any particular time compared to shifting up a gear (mechanical advantage) Lower RPM means cooler bearing and oil temps according to all engineering documents ive ever read Higher RPM give more oil pressure when a pump is failing or main bearings are beyond service specs I just don't know what is theoretically better for the engine, and would like to know if any of you have ever been in a similar situation and wondered what your driving habits were. banjo?
