Wet Sump vs Dry Sump
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From: Blazing on 10 Jun 2007 03:45 I have a question for you technical experts. What is the purpose of dry-sump lubrication? I had a BSA back in the 60s/70s. We had a stormy love/hate relationship. It was the most wonderful bike in the world, when it ran, which was about half the time. The BSA had dry sump. There was an oil tank on the right side, and a complicated plumbing setup, tubes and fittings and stuff, that delivered oil to various points on the engine. Every one of those tubes and fittings oozed dirty oil, and the engine always looked like it had been dragged through a mud puddle. You could almost track this bike by following the trail of drops of oil. I wondered at the time what the advantage of was. I notice Harleys have an oil tank on the side, am I correct in assuming they have dry sump too? Someone told me that the idea was that you could put the engine lower in the bike because there was no oil pan on the bottom. Could that be it? I have my doubts.
From: The Older Gentleman on 10 Jun 2007 03:53 <Blazing> wrote: > I have a question for you technical experts. What is the purpose of > dry-sump lubrication? Generally, as you say, it allows you to mount the engine lower. There's little extra advantage, save for, if you want, you can mount a ginormous oil tank and thus achieve better oil cooling. -- 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: Gary Walker on 10 Jun 2007 04:49 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. I would think that a dry sump system would allow the oil to remain cooler, but I really don't know. However, I do know that I was able to overfill that K3's oil tank, and thereby increase the oil supply, because of the dry sump system. Additionally, although not a widely used practice, the dry sump system allows a few models to retain their oil supplies in the frame. Realizing, that I have absolutely no significant contribu- tions here, I decided to dig up some web references that might make this response worthwhile. Here are a few related topics concerning wet/dry sump systems, and the (dis)advantages of either. "Relevant/related comments will appear highlighted" http://64.233.167.104/search?q=cache:TNsZSOvOuuIJ:www.patentstorm.us/patents/6116205-description.html+%2B%22dry+sump%22+%2B%22wet+sump%22+%2B%22motorcycle%22&hl=en&ct=clnk&cd=2&gl=us http://64.233.167.104/search?q=cache:8NdL60FK1psJ:www.hondabikes.net/forum/archive/wet-sump-vs-dry-sump-2351.htm+%2B%22dry+sump%22+%2B%22wet+sump%22+%2B%22motorcycle%22&hl=en&ct=clnk&cd=6&gl=us http://64.233.167.104/search?q=cache:x-SXBSfmRl0J:www.totalmotorcycle.com/BBS/archive/o_t__t_2268__wet-sump-vs-dry-sump.html+%2B%22dry+sump%22+%2B%22wet+sump%22+%2B%22motorcycle%22&hl=en&ct=clnk&cd=7&gl=us http://64.233.167.104/search?q=cache:et3O9DmkkdMJ:www.xlforum.net/vbportal/forums/archive/index.php/t-20877.html+%2B%22dry+sump%22+%2B%22wet+sump%22+%2B%22motorcycle%22&hl=en&ct=clnk&cd=8&gl=us http://64.233.167.104/search?q=cache:RZUcmV7zrCMJ:www.xlforum.net/vbportal/forums/showthread.php%3Ft%3D20877+%2B%22dry+sump%22+%2B%22wet+sump%22+%2B%22motorcycle%22&hl=en&ct=clnk&cd=9&gl=us http://64.233.167.104/search?q=cache:JMZ7Zi72H-oJ:www.thumpertalk.com/forum/archive/index.php/t-70265.html+%2B%22dry+sump%22+%2B%22wet+sump%22+%2B%22motorcycle%22&hl=en&ct=clnk&cd=10&gl=us http://64.233.167.104/search?q=cache:mlntIJ_W9wwJ:www.offshoreonly.com/forums/showthread.php%3Ft%3D88353+%2B%22dry+sump%22+%2B%22wet+sump%22+%2B%22motorcycle%22&hl=en&ct=clnk&cd=25&gl=us "And, many many more".... "The Older Gentleman" <chateau.murray.takethisout(a)dsl.pipex.com> wrote in message news:1hzhhy2.jhrg104x1r0gN%chateau.murray.takethisout(a)dsl.pipex.com... > <Blazing> wrote: > >> I have a question for you technical experts. What is the purpose of >> dry-sump lubrication? > > Generally, as you say, it allows you to mount the engine lower. There's > little extra advantage, save for, if you want, you can mount a ginormous > oil tank and thus achieve better oil cooling. > > > -- > 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: The Older Gentleman on 10 Jun 2007 05:12 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. -- 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: Mark Olson on 10 Jun 2007 08:14
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? -- '01 SV650S '99 EX250-F13 '98 ZG1000-A13 OMF #7 |