Lugging, oil pressure, etc. (Low RPM)
12-13-2014, 03:25 AM
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Lugging, oil pressure, etc. (Low RPM) What are the possible issues of running at too low RPM?
I listed two that seem to be common, but are there others?
And how do I determine at what RPM it's going to be an issue? Is it based on RPM, on HP? etc.
I ask, because I'm trying to figure out which final drive ratio will get me the best MPG, without damaging anything (65mph).
Along with operating on level ground, I also need to make sure it won't fail when I hit a grade or wind.
I've been looking around the 'net for a while, and it's hard to find any good information.
Thanks!
I listed two that seem to be common, but are there others?
And how do I determine at what RPM it's going to be an issue? Is it based on RPM, on HP? etc.
I ask, because I'm trying to figure out which final drive ratio will get me the best MPG, without damaging anything (65mph).
Along with operating on level ground, I also need to make sure it won't fail when I hit a grade or wind.
I've been looking around the 'net for a while, and it's hard to find any good information.
Thanks!
Last edited by icor1031; 12-13-2014 at 03:31 AM.
12-19-2014, 03:26 PM
#2
Not quite sure why you're trying to optimize mpg on a performance V8, but...
You'll be splitting hairs over small differences, as most of the gain is with aerodynamics/vehicle speed, and not engine RPM. The difference of a couple hundred rpm, without changing engine technology or the entire car, will make an insignificant difference.
Low temperatures due to a lot of low-load driving will increase carbon deposits, as well. As long as you are above the rpm that causes lugging, you won't cause much damage. Carbon buildup would be the main one for long-term reliability. Too low of rpm can reduce engine efficiency, which increases carbon buildup.
You'll be splitting hairs over small differences, as most of the gain is with aerodynamics/vehicle speed, and not engine RPM. The difference of a couple hundred rpm, without changing engine technology or the entire car, will make an insignificant difference.
Low temperatures due to a lot of low-load driving will increase carbon deposits, as well. As long as you are above the rpm that causes lugging, you won't cause much damage. Carbon buildup would be the main one for long-term reliability. Too low of rpm can reduce engine efficiency, which increases carbon buildup.