Subject: RE: Oil Filter for a loop
Author: Greg Bender
Date: Jan 12, 2005, 6:20 AM
Post ID: 1718196383
Hi Patrick,
Good thoughts you have here. If I'm understanding you correctly, you see
the main problem with this unit as the lack of an oil bypass. That is
problematic and something that would need to be addressed as the engine
cannot be starved of oil.
But I'm still interested in this overall design because it would be very
easy to install and wouldn't require new front main bearings or a
different oil pan, plus all the machining that needs to be done with
Dave Richardson's approach. If an engine were disassembled, Dave's
approach would probably be the preferred one. But on an assembled and
running engine, it would be nice to have a bolt on fix.
I'm not sure which type of oil (dyno or synthetic) he recommends nor the
change interval. If an oil bypass was installed, then I don't think it
would matter which type of oil was used. Without an oil bypass, however,
I would think that synthetic would be preferred simply because it is
thinner when cold and would probably pass through the filter medium
better. As for change interval, I *think* the first filtered models
recommended 3,000 mile oil changes and 9,000 mile filter changes (every
third oil change). My 2000 Quota recommends synthetic oil and filter
change every 6,000 miles.
I think there is probably a range of acceptable miles for the oil/filter
changes. I personally like the 6,000 mile interval because it is easy
for me to remember when to change all my fluids (engine, trans, rear
drive)...but there is nothing scientific about that.
Without having the part in hand, it's difficult to know how it might be
altered to provide an oil bypass. If I understand the Guzzi system,
bypass is provided by a spring inside the UFI filter. If I'm wrong,
somebody please correct me. If that's the case, then perhaps the center
bolt that holds the filter on might be designed and machined in such a
way as to provide a spring loaded oil bypass system.
Of course, this all requires designing, machining, and measuring
capabilities that my garage does not have. But, in my opinion, it's an
intriguing idea that holds definite promise.
Patrick Hayes wrote:
Greg Bender wrote:
A regular cartridge oil filtration system generally has some sort of pressure sensing bypass designed in. Either in the filter itself or in the oil pump and passages. If the oil is too thick, too cold or the filter is too dirty, the oil supply bypasses the filter and continues to lubricate vital parts. The filter proposed here has no such bypass. If you leave it for "longer duration between changes", you risk having the filter medium blocked up and the engine starved for oil. How many old loops went hundreds of thousands of miles without anything but a bug screen to filter oil? Sounds maybe risky and at least debatable. Wonder how long he is recommending exchange intervals? And if he is using Dyno or Synthetic oils? When Guzzi first came out with the in-pan filter on Tonti frames, I knew a guy who had moved up from a loop. He decided the filter exchange was a hassle. He removed one, blew out its guts, and re-installed the cartridge shell so that it would work like his reliable old loop had done. Patrick Hayes Fremont CA |
Regards,
Greg Bender
1971 Ambassador
2000 Quota
http://www.thisoldtractor.com/gtbender