I recall seeing somewhere that a deep sump with extended pickup resulted in a heat reduction of 20 degrees under normal operating conditions. I think it was over on RIMC, but no doubt that post was recently culled.chicagorandy wrote:Will a deep sump reduce engine "heat"? Probably not very much.
Very good point, I hadn't thought of it that way. Makes sense, but I still think extra oil capacity is a very good thing when it comes to prolonging the life of bearings and bushings. Plus, the factory recommends an extra 1/2 litre of oil in the sump during hot weather operation, as it increases the amount slung over the engine internals thus helping with the cooling.chicagorandy wrote:At some point whatever quantity of oil you have in there is going to be pretty much the same temp +/- a few degrees. I'm thinking deep fryers? Regardless of their capacity, they will all get to the same operating temp. As it relates to cooking, the more oil the LESS change in temp from the addition of the colder food. On a Ural engine the heat sources remain constant, regardless of sump capacity.
Irrelevant on an Ural anyway, as it is splash-lubed and not pressurised like the Dnepr. I believe a deep sump is a good thing, especially for my situation which sees the Ural doing long distance touring, fully loaded, at speeds of 90-95kmh. I don't go off road very much with it, but when I do I am very careful of the reduced ground clearance (learned that the hard way once). I find in the winter that changing to 15W40 results in easier startups and I'm willing to pay the cost of an extra litre of oil at each maintenance interval, if only for the benefit of the peace of mind it gives me.chicagorandy wrote:Changing the sump does not change the oil pressure or increase the size of the oil passages.
So why then do they list a deep sump on the Accessories page of the IMZWA website?BillyG wrote:They boys who designed the engine did a good job. The stock sump is plenty good and adding more is not going to do a bit of good. The factory even came to the same conclusion and said so in no uncertain terms.
That's a racing application, I'm more interested in how it applies to the Ural. I'm not looking for extra HP, nor do I consider myself a "sucker". I have had a couple of trusted sources explain to me the benefits of a deep sump and extended pickup and their reasoning made sense to me. However, after reading your post I am left with more questions than answers and I am interested in discussing the merits (which according to you are non-existent in this case) or disadvantages of using a deep sump.BillyG wrote:Oh yeah, I forgot one other reason folks slap DS's on their mills...to get the crank out of the oil to prevent loss of rpm's from roping. Again, something someone who is racing and attempting to eek every single rpm out of an engine.
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