GB windage trays for the street...
#1
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GB windage trays for the street...
Hello All,
A recent question about a Greg Brown windage tray set up on an FB group has piqued my curiosity.
I very much understand the concept, and the benefits for a track 928 engine.
So...I have a silly, ne stupid question: is there any benefit to a GB windage tray set on a street driven 928 engine? More specifically on a 32V S3?
Thanks for your time, attention, insults, and brickbats.
A recent question about a Greg Brown windage tray set up on an FB group has piqued my curiosity.
I very much understand the concept, and the benefits for a track 928 engine.
So...I have a silly, ne stupid question: is there any benefit to a GB windage tray set on a street driven 928 engine? More specifically on a 32V S3?
Thanks for your time, attention, insults, and brickbats.
#2
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My $0.02: The need for, usefulness of, a windage tray is proportional to average rpms.
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Not what I implied; You misunderstand.
On an ‘87/‘88 auto with the 2.20 rear end average rpm is probably 2k or less. On an GT or GTS 5-speed average rpm is 3k or more and add-in engine braking. So the windage tray is more useful on 2.73 rear end 5-speeds than it is on 2.20 autos. In general.
On an ‘87/‘88 auto with the 2.20 rear end average rpm is probably 2k or less. On an GT or GTS 5-speed average rpm is 3k or more and add-in engine braking. So the windage tray is more useful on 2.73 rear end 5-speeds than it is on 2.20 autos. In general.
#5
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If I recall correctly, the FB post was about using windage trays without a pan spacer. Whatever other considerations (and I agree with Dave and John), windage trays without a spacer makes zero sense. You need room under the screens for them to be effective.
#7
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You sure about that? My understanding is the the windage trays become more beneficial as the oil pan depth is reduced. No real evidence on this for the 928, of course, and pan spacer is of course beneficial.
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Mine as well. It's not like the windage trays are immersed in sump oil even without a spacer.
#9
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No, not sure at all. A deeper sump is certainly better, trays or no trays. Is a shallow sump with trays better than a shallow sump with no trays? Perhaps, but a deeper sump with trays is better than either. Why fit trays and not a spacer? That's what makes no sense to me.
#10
Nordschleife Master
No, not sure at all. A deeper sump is certainly better, trays or no trays. Is a shallow sump with trays better than a shallow sump with no trays? Perhaps, but a deeper sump with trays is better than either. Why fit trays and not a spacer? That's what makes no sense to me.
Of course, there are the crankcase gas flows to consider as well.
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Some folks don't want the 'weird' starter. Some folks are concerned about the motor mounts (eventually) collapsing and the oil pan riding on the engine carrier due to the spacer.
The first is subjective. The latter is not subjective. Motor mounts will collapse. But, I can't tell 'some folks' that the pan will or will not rub on the engine carrier when the mounts collapse. So, while the customer isn't always right, this is a case where I'm not going to try to convince them they're wrong. If they want trays with no spacer then that's what they get.
But, do note that you can't use the 4/8 tray without a spacer and the 3/7 tray requires the inside of the pan to be 'clearanced.'
The first is subjective. The latter is not subjective. Motor mounts will collapse. But, I can't tell 'some folks' that the pan will or will not rub on the engine carrier when the mounts collapse. So, while the customer isn't always right, this is a case where I'm not going to try to convince them they're wrong. If they want trays with no spacer then that's what they get.
But, do note that you can't use the 4/8 tray without a spacer and the 3/7 tray requires the inside of the pan to be 'clearanced.'
#14
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Otherwise, for a streeter, it is not needed at all - the money is better-spent elsewhere.
#15
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Porsche installed a "windage tray or screen" on the early 4.5 liter engines and then again, on the GTS engines, without a pan spacer....they were trying to keep the oil from being "whipped up" in the oil pick-up area.
There's a reason that I sell my windage trays "separate" from my pan spacer and not as a "kit". They work great, keeping oil from "bouncing" off the oil pan (in the rear of the pan) and keep oil sitting in the pick-up area from being "whipped" up by the crankshaft (in the front of the pan).
I'd agree that moving the oil away from the crankshaft works better (pan spacer), but it's not a requirement.
There's a reason that I sell my windage trays "separate" from my pan spacer and not as a "kit". They work great, keeping oil from "bouncing" off the oil pan (in the rear of the pan) and keep oil sitting in the pick-up area from being "whipped" up by the crankshaft (in the front of the pan).
I'd agree that moving the oil away from the crankshaft works better (pan spacer), but it's not a requirement.
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