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Oil filler and crankcase ventilation baffle for supercharger application
I just wanted to share the two-piece oil fill and crankcase evacuation parts I designed for my supercharger kits. I figured the concept may be of benefit to others undertaking intake manifold fabrication or projects where the factory oil fill neck is not usable, or when additional windage protection is needed in conjunction with the stock baffle/neck.
The lower "P9-OC01" inserts into the main chimney in the block and seals with an o-ring. It is a single piece, machined with slots that align to the casting "grooves" inside the side of the chimney to block as much flung oil as possible. There are 25 - 5mm drilled passages with a total length of 7.5mm that the windage must also pass through. There is no direct line-of-sight between the outlet and inlet paths. These 25 holes also have a generous chamfer on the upper face to promote oil draining when filling through the baffle. The larger chamber above the baffle grid allows stacking with the factory stamped baffle or the plastic baffle on the later 87+ cars (if there is ever a desire to use in conjunction with either a factory part, or aftermarket part with factory footprint.) This chamber can also be used to house additional filtration/scrubber media for custom applications.
The upper "P9-OC03" can be placed above the machined baffle assembly or just directly onto the block (for use with an external baffle system), or with an aftermarket baffle from our great vendor network.
There is a 5.25mm deep area clearance that will flow the same as an equivalent 17mm ID hose when used with a stock baffle, and there is no flow restriction at all when used with the machined lower baffle or other aftermarket baffle with larger opening. The hose fitting is for 1” or 25mm hose, so can be connected directly into a provent or other device. The ID of the hose fitting is designed so that a secondary machining operation can be performed, removing the hose nipple and machining a female -10ORB port for any motorsport grade connection. This is ideal for use with a low range vacuum pump.
The hose fitting is located so that the hose routes under the water bridge, directly between the passenger head port and the block return port (beneath the upper radiator hose).
The parts are designed so they can be used as a large passive breather system (using a 1” hose connection) or with a regulated lower level vacuum pump (with the upper machined for the -10 ORB).
I will be designing a bracket for a vacuum pump for the twinscrew kit but wanted oil breather hardware that I could use for either configuration. I also tried to design the parts so if anyone else need to make a custom breather system of their own, the parts would work in conjunction with many existing aftermarket or stock components.
I am machining several extras of both parts, so if anyone needs either, let me know and I will set one aside.
Twin-screws need something like this since the nose of the SC requires removal of the filler neck and a relocated mechanism for filling oil.
I think it would only make your life harder since you'd have to engineer a relocated oil filler port? Unless you have already deleted the stock neck?
My overall plan was to use the OB oil drain on the top of the oil pan as a filler point. Since I'm creating an airbox for the ITB's I have to move the strut brace and so a factory fill neck is in the way.
Last edited by Bigfoot928; 10-17-2018 at 12:03 AM.
The lower "P9-OC01" inserts into the main chimney in the block and seals with an o-ring. It is a single piece, machined with slots that align to the casting "grooves" inside the side of the chimney to block as much flung oil as possible. There are 25 - 5mm drilled passages with a total length of 7.5mm that the windage must also pass through. There is no direct line-of-sight between the outlet and inlet paths. These 25 holes also have a generous chamfer on the upper face to promote oil draining when filling through the baffle. The larger chamber above the baffle grid allows stacking with the factory stamped baffle or the plastic baffle on the later 87+ cars (if there is ever a desire to use in conjunction with either a factory part, or aftermarket part with factory footprint.) This chamber can also be used to house additional filtration/scrubber media for custom applications.
The lower baffle will fit under the stock oil filler, but it does raise it by 5mm. These are designed more for applications where the stock manifold is not being used. I can install one on a motor with a stock s4 manifold and check for clearances, I do not have any other stock manifolds handy for testing. However, there is already a good supplemental baffle system to use with a stock neck and manifold that only raises the filler a nominal amount.
Cost on these after anodizing should be in the $85 area for either part. Not looking to make a markup on anything from this batch. I just need some for my kits, so making a couple extras in case it helps anyone with their projects. Cost would be different if it was a complete kit with o-ring, hardware... etc but these are just being offered as fabrication aid to help others get their projects off the ground faster.
Sterling, I can hold yours back if you dont want it anodized. I was just planning on a satin clear finish for corrosion resistance, but if you are planning on polishing... etc, that makes sense.
10-16-2018, 05:19 PM
Oil filler and crankcase ventilation baffle for supercharger application
