Wet Sump vs Dry Sump
in [Motorcycles]
|
Prev: 1974 Honda CJ350?
Next: Time for a new slogan?
From: Albrecht via MotorcycleKB.com on 10 Jun 2007 10:08 Blazing Laser wrote: >I have a question for you technical experts. What is the purpose of >dry-sump lubrication? Wet sump? Dry sump? Early motorcycles didn't need no steeking sump filled with dirty oil. The guy who designed the first dry sump system for a motorcycle was probably trying to figure out a way to recycle his oil instead of running it through the engine once and dumping it directly on the ground. Google for "Pilgrim pump", "Scott Flying Squirrel", "JAP", "J A Prestwich", etc. -- Message posted via MotorcycleKB.com http://www.motorcyclekb.com/Uwe/Forums.aspx/bike/200706/1
From: The Older Gentleman on 10 Jun 2007 12:42 Mark Olson <olsonm(a)tiny.invalid> wrote: > The Older Gentleman wrote: > > Gary Walker <twf(a)swbell.net> wrote: > > > >> Typically, I think, many of the dry-sump bikes also have > >> a separate transmission. Not that this has anything relat- > >> ed to dry/wet sump choice. > >> > >> Notice, I said many. So, don't shotgun 100's of respon- > >> ses with exceptions. I know, I had one. My '73 Honda > >> K3 was dry sump with no external transmission. I'm sure > >> there are many others. > > > > No, there aren't. Not post about 1970, anyway. Think Yamaha > > single-cylinder dirt bikes, the SR500 single, Honda XBR500 singles, BMW > > 650 singles: all dry sump, all with unit engines. > > > > I can't think of a single dry-sump engine produced in the last 30 years > > that has a separate transmission. In fact, I can't actually think of any > > non-unit engines produced in the same time frame, though there may be > > some. > > Am I being thick or have you forgotten Harley-Davidson? Indeed I have. Mea maxima culpa. But they're not real bikes anyway. -- BMW K1100LT 750SS CB400F CD250 SL125 GAGARPHOF#30 GHPOTHUF#1 BOTAFOT#60 ANORAK#06 YTC#3 BOF#30 WUSS#5 The bells, the bells.....
From: tomorrow on 10 Jun 2007 13:06 On Jun 10, 8:14 am, Mark Olson <ols...(a)tiny.invalid> wrote: > The Older Gentleman wrote: > > Gary Walker <t...(a)swbell.net> wrote: > > >> Typically, I think, many of the dry-sump bikes also have > >> a separate transmission. Not that this has anything relat- > >> ed to dry/wet sump choice. > > >> Notice, I said many. So, don't shotgun 100's of respon- > >> ses with exceptions. I know, I had one. My '73 Honda > >> K3 was dry sump with no external transmission. I'm sure > >> there are many others. > > > No, there aren't. Not post about 1970, anyway. Think Yamaha > > single-cylinder dirt bikes, the SR500 single, Honda XBR500 singles, BMW > > 650 singles: all dry sump, all with unit engines. > > > I can't think of a single dry-sump engine produced in the last 30 years > > that has a separate transmission. In fact, I can't actually think of any > > non-unit engines produced in the same time frame, though there may be > > some. > > Am I being thick or have you forgotten Harley-Davidson? Besides the Harley big twins (Sportsters have a unit engine) there is, of course the Indian Enfield Bullet which has a non-unit engine/trans, dry sump, and oil tank.
From: Stupendous Man on 10 Jun 2007 13:13 The 69 Lotus formula 2 car I am building at work has a DBA engine converted to dry sump. The main reason is to keep oil pressure regardless of the G forces acting on the engine while driving. The "pan" is little more than a crankshaft cover with a slot at the bottom with baffles and traps to keep the oil from flowing away from the pickup. Bikes have minimal G forces acting on them sideways, as they lean, but there is still plenty of force fore-aft as well as verticle in jumps, wheelies, etc. Dry sumps are common in aircraft -- Stupendous Man, Defender of Freedom, Advocate of Liberty
From: The Older Gentleman on 10 Jun 2007 13:33
Stupendous Man <spam(a)trap.com> wrote: > Dry sumps are common in aircraft Didn't know that. Ta. The Merlin was dry sump, now I think of it..... -- BMW K1100LT 750SS CB400F CD250 SL125 GAGARPHOF#30 GHPOTHUF#1 BOTAFOT#60 ANORAK#06 YTC#3 BOF#30 WUSS#5 The bells, the bells..... |