02GF74
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| posted on 17/10/06 at 03:52 PM |
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stupid dry sumping question
... specific to crossflow.
I have 1300 engine and a look underneath shows that the sump is about the same level as the rear of the engine/gearbox housing.
I know folks have dry sumped crossflows but surely that achieves nothing due to the gearbox housing being just as low?????
(can it be a 1600 engine thing as the crank throw is greater so deeper sump?)
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ecosse
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| posted on 17/10/06 at 04:02 PM |
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I think the reason for fitting dry sumps is one of oil surge and friction (crank going through the oil) rather than sump depth.
Cheers
Alex
As an aside, I'm sure the 1600 and 1300 sumps are very close in size the major difference being the groves in the side walls to allow for the
greater crank throw (which I discovered after fitting a 1300 sump to 1600 and hving the crank make its own grooves! 
[Edited on 17/10/06 by ecosse]
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MikeR
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| posted on 17/10/06 at 04:29 PM |
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On other engines i believe the sump drops a lot lower than the box - hence the advantage - of course the main one is that the engine
"shouldn't" get oil surge.
Plus if you do ground, its teh gearbox bell housing and not your sump - hence you're not loosing oil and your engine going bang.
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flak monkey
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| posted on 17/10/06 at 04:31 PM |
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The crank should never go through the oil...
If it does you create aerated oil which is useless for lubricating bronze/lead bearings...
David
Sera
http://www.motosera.com
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russbost
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| posted on 17/10/06 at 09:21 PM |
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Aerated oil, loss of power, surge to name but 3!
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