Big electric fans may be nicer than fan clutches that seem to fail and can be hard to track down... but not when the relays/controller fail....
On Wed, May 30, 2012 at 10:39 PM, <relng...@aol.com> wrote: > > ...An electric oil pump?! Amazing. I guess they are pretty convinced of > > its > > reliability... > > > The days of direct drive AC compressors, oil pumps, water pumps and > open/closed thermostats are disappearing. I don't know what BMW and Audi > are doing > but Porsche and MB are adopting this technology because it reduces power > requirements and thus improves fuel economy. > > Engines simply don't need full oil pressure all the time but just maintain > enough for cooling bearings and maintaining the oil cushion and it varies a > lot. Engine driven cooling fans are no more because a variable speed > electric fan does it better and thermostats are variable to better > maintain engine > temps along with the fan speeds because of emission requirements. AC > compressors don't have clutches any more because swash plate designs allow > refrigerant pumping as needed instead of the all or nothing designs of the > past. > > My M272 powered C300 uses a swash plate compressor so the sag in power is > never felt because the plate angles vary depending on cooling needs. Same > for > the engine thermostat. And, the big electric fan behind the radiator is > never heard if the windows are closed and then only on high speed. > > So far at 4 1/2 years none of these components has so much as hiccuped. > > RLE > > > > > _______________________________________ > http://www.okiebenz.com > For new and used parts go to www.okiebenz.com > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
