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  • Users: Nobrac
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  1. Nobrac

    Light Diesel Engine Lubrication

    Good question Dr.Webb. the rest of the powertrain is often overlooked in the quest for engine life. All of our trucks ar manual trannys and change the tranny, transfer cases and both differntials ataround 15,000 miles. BTW, all of our waste oil is reused for other purposes. This is a farming...
  2. Nobrac

    Light Diesel Engine Lubrication

    Thanks for the assurance. That was my pov too but this "expert" insists that I am doing more harm than good. I cannot imagine how but then I am not a diesel expert.
  3. Nobrac

    Light Diesel Engine Lubrication

    I have been changing the lubrication oil and filter in my 1999 7.3liter International Powerstroke diesel (Ford f-250) at intervals of between 2,500 and 3,00 miles. I operate at 7,800 to 9,000 feet and with substantial loads on long grades. The truck is often overloaded; e.g. bumper trailer hitch...
  4. Nobrac

    Engine Compression at Altitude

    THank you, thank you. This gives me what I needed to make my case. I am going to try an write up a calculation work sheet on Excel using his info a a model.
  5. Nobrac

    Engine Compression at Altitude

    Thanks guys. Perhaps I was a little inspecific. I realise the cylinder leak down test is more predictive than than the compression test. It is just that I have compression test data at sea level and at 7,800 feet. I agree that 50ccs compressed to 5 ccs is the same compression ratio. I am asking...
  6. Nobrac

    Engine Compression at Altitude

    Greeting to you all. This is my first post on Eng-Tips. Can anyone tell me how to calculate decreased cylinder compression of a naturally aspirated internal combustion engine at various altitudes? Actually, I will work the formula backwords:i.e. I have measured compression numbers and want to...

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