Dart SHP Oil Return

[Indycars]

There is no place for oil to return to the pan except down thru the middle over the
camshaft and on to the crankshaft. With the concern over windage it seems there would
be places in the front and rear of the valley for oil to drain like in a stock SBC.

Now this should help the camshaft and lifters, but is it too much for a street engine with a
hydraulic roller to have this much oil draining onto the crankshaft ??? Holes could be drilled from
the valley to the timing area, that looks to be pretty simple.

 

[grumpyvette]

big blocks tend to REQUIRE constant oil flow over the lifters and cam lobes to lubricate correctly,thats what the blocks drain that way, a windage screen and optional crank scraper will allow the lubrication, but sweep excess oil into the sump and not allow oil to be turned to froth or oil to be swept out of the sump.
Id suggest adding shrapnel screens, a few magnets

painting the blocks internal surfaces with a good epoxy paint to trap micro metallic crud and speed oil draining, helps, windage your concerned with is NOT the oil draining from above , but preventing oil from being drawn from the sump or turned to froth

running an engine like this picture above ,with just an open oil pan, tends to waste 4-8 hp or more at higher rpms and may over load the rings with oil on the cylinder walls, and cause the bearings to get intermittent oil pressure

installing the combo of crank scraper and windage tray allows you to regain 4-8 hp,too have much better controlled ,& dependable lubrication and oil pressure and have less chance for bearing damage from oil starvation
without a windage screen oil in the sump is frequently whipped into a froth at high rpms reducing bearing support and cooling

with a windage screen oil in the sump is protected from being whipped into a froth at high rpms, thus increasing bearing support and cooling, so bearings tend to last a good deal longer

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viewtopic.php?f=51&t=1458&p=3265&hilit=shrapnel#p3265

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http://www.carcraft.com/techarticles/cc ... ewall.html

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viewtopic.php?f=52&t=282&hilit=magnets

 

[Indycars]

I already have the magnets and screen material is just down the road at lowes.

So Dart felt that the extra lubrication was needed for the lifters and camshaft, therefore they left out the drains
in the front and back of the valley.

 

[grumpyvette]

I already have the magnets and screen material is just down the road at lowes.

So Dart felt that the extra lubrication was needed for the lifters and camshaft, therefore they left out the drains
in the front and back of the valley.

, its NOT just DART, its almost EVERY big block, block casting design, don,t forget to dill the pass side lifter gallery oil plug with a .031 drill so air trapped in the lifter gallery is rapidly pushed out and replaced with oil and that so oil sprays into the rear of the timing gears for extra lubrication
(even some high performance factory OEM engines had that mod done)

LOOK CLOSELY THE LEFT LIFTER GALLERY PLUGS DRILLED TO SPRAY OIL