Quote:
Originally Posted by serialk11r
I doubt a bypass filter will pay for itself in savings. As is, the variable displacement pumps on newer cars are only saving less than 1% of total fuel consumption. Plus, the oiling system is a bit harder to work with when it comes to these sorts of upgrades.
Probably better to save energy at the water pump instead.
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Good points Serialkiller, but how many of us drive these newer cars?.... For those of us who drive older vehicles there are definitely savings to be had. While the later model 4 banger with variable oilpump displacement running 5/30 (read thin) weight oil might only save 1%, an older car that runs a rootes style oil pump (which is rated at around 50% efficiency ) and uses 20w50 engine oil along with high operating oil pressures leaves more gains for the taking. From what I have read on this forum for many here the best mileage is the goal, not necessarily saving money, otherwise why would anyone buy a new "economical" car and suffer the thousands of dollars (pounds?) in depreciation as they drive out of the showroom floor?
I'm not having a go at you Serialkiller (with a username like that I'm not sure that I would want to upset you
), just pointing out that for many the challenge is to get the best mileage, while for others the goal is to save as much cash as possible. The often overlooked gain when running a bypass oil filter is longer engine life, which can only help to stretch the possible life of the vehicle. The bypass filters have been around for decades, and are usually sized to take a tightly wound toilet roll as the filter medium, so replacement filters are cheap. For even more economy the used/replaced bypass filter which is now full of carbon/oil at the end of its service life can be used as excellent firewood if one uses a combustion heater for warmth in the winter.(just don't breathe in the fumes produced by the combustion). I like your suggestion of slowing down the water pump, which I have done in the past in a quest for more power from less fuel, obviously the readers here will make their own decisions regarding potential fuel/money savings from this mod, I only offer the idea as another avenue to pursue for those who are determined to try anything that may help them along the road to better economy.