Posted by Blazing Laser on June 10, 2007, 3:45 am
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.
Posted by The Older Gentleman on June 10, 2007, 3:53 am
<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.....
Posted by The Older Gentleman on June 10, 2007, 5:12 am
> 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.....
Posted by Mark Olson on June 10, 2007, 8:14 am
The Older Gentleman 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
Posted by The Older Gentleman on June 10, 2007, 12:42 pm
> The Older Gentleman 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.....
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> dry-sump lubrication?