One oil change in 11000 miles?
I'm considering a beautiful, garage kept 2007 Winnie Adventurer with the W24 Workhorse chassis. Unfortunately, it has only had one oil change, and that was at 6000 miles. I also wonder about the en...
Forum Discussion
free radical wrote:
Something interesting for you technical types,Coates Rotary Spherical Valves which not only improve breathing capability of an engine icreasing hp but also reduce the need for frequent oil changes..
Whats mind bogling that none of our car manufacturers would use it..
Rotary valves of various kinds have been around for ages and ages. Generally their drawbacks for engines are difficulty in maintaining seals and possibly in wear. This particular implementation would seem to me to have poor wearing qualities, with the bearing surfaces apparently being unlubricated bronze bushings. You can bet that if they had significant advantages over current valves they would have been adopted by car makers who go to great lengths to improve fuel economy by little bits (a fraction of an mpg here, a fraction there).
Rotary valves do have other applications, such as plumbing and some brass musical instruments. My trombone's F attachment is controlled by a rotary valve, as a matter of fact, as are my washing machine's water supply connections.
