drnick

carl, will the scrapers clear the GTS rotating assembly? watching this thread with interest.

GlenL

Definately. And these are components that we need badly.

Let me add that Carl actually warned me off that the scrapers weren't tested yet. I wanted to try them and if need be help to verify their value. That took a good deal of work I'm really pleased with the result.

It'd be great if someone would add just the sump cover to their car and track that. This would help identify what level of oil control improvement is due to the sump cover and what is due to the the scrapers. Adding before-and-after dyno runs around a scraper installation would be great.

Will the sump cover like I've got be available as a seperate item?

drnick

glen, im running a home made sump cover currently although it dosent have the mesh covering. the engine is freshly rebuilt so its difficult to compare oil consumption from previous but its using less than my 88 or 86 did. more importantly will be whether its helping to maintain oil pressure in corners, im going to be installing a mechanical oil pressure gauge at some point and then i will keep a closer eye on it. ive seen blips in the oil pressure with my 88 during sweepers at high speed, nothing so far with the GTS engined 86.

Carl Fausett

Thanks Glenn, I am glad you mentioned that. That's why the crank scrapers are not in our catalog yet - nothing gets there until it has passed inspection and real-world 928 driving. We figure that's part of what you pay us for....

Glenn... on the drainpipe for the oil separator (16v oil fill/breather installation)

DEVEK used to sella valve to install in that drain hose so that, when you dive into a corner and the oil climbs the pipe, it would not climb up into the oil separator tank and then overwhelm your catch tank/PCV system.

For the reasons I have already expressed above, I think this is an area that needs attention, but that is the wrong way to do it. I also mentioned above how I tried a zero cracking pressure valve in that area too.

I am milling a restrictor for that hose from aluminum billet - it will always allow air to pass but will slow down the oil from climbing up the hose until you are back out of the brakes and on the throttle again (when the oil flows DOWN the drain pipe and not up).

Want me to make you one to try? No charge. Easy installation - cut the rubber hose, insert this restrictor with a hose clamp on each side.

GlenL

Carl,

Sure!

I've got a home-made version of the shut-off valve approach including the straight and elbow hoses. Should be easy to put in a new part to test.

I plan to be at RA July 10 and 11 and could test it then.

BC

Is the solution (part of it) not to put the S4 oil filler on the early cars, and then replace the hole in the pan with a plate, or with a later pan?

GlenL

That's a good data point.

It's clear that a sump cover will keep oil in the sump on acceleration and cornering. The next trick is to get the oil into the sump.

Brendan,

With the S4 filler on a 16v engine there needs to be an external catch/seperator and vents created somewhere to it. While the 16v filler/seperator is clearly not doing the job (for many of us) it's not increasing the ejection problem.

Another trial at my next track date will be to put brass scrubbing pads into the filler. They'll help catch some oil. Can't hurt!

drnick

i plan to add scrapers and some mesh to the bottom of the sump, at the minute im on street tyres so i dont think i will run into probs unless revving the nuts off it or running low on oil, both of which are best avoided!

BC

I am trying this on my Euro right now. I put copper scour pad in the neck area, and have a slight vac going out the top back into the intake, but the two main outputs are directly into a catch aparatus. I get about a 1/4 quart in every day riving, and way more when I drive hard. Its worth it though, to keep oil out of the intake, and internal pressure down.

Carl Fausett

Kevin's new scrapers arrived to day complete with directional mesh and such.
Here are a few quick photos.

I'll get more photos as they are installed.

I am sorry I will not be at RA on July 10th/11th - I have to go to NYC on a business trip.

Rick Carter

Kevin,
It's obvious you play for the love of the game. There's a lot of satisfaction in getting it right.
Thanks,

Carl Fausett

Yeah, Kevin is all over it.

The PTO website is backed up by an old-school UNIX-type server, but if you can read instructions, you can search by patent number and read and review it yourself at
http://www.uspto.gov/patft/index.html

To view the images, your computer may need to install a little image viewer, but there are links to the viewer they recommend on the site, and the image viewer is free.

Carl Fausett

Glen: here is what I spun off on the Lathe yesterday. its a simple thing - an aluminum restrictor that you will insert into your rubber drainpipe hose. Cut the hose in a section that is vertical, insert, apply two hose clamps.

Your open-road racing is different than mine, and I think it might be less of an issue for your style of driving. But, as we have been able to show in this thread, if you hit the brakes hard (like diving into a tight corner) the oil will climb up that drain hose immediatly and over come the capacity of the PCV system. We have also shown that, should the venting of crankcase pressure be reduced in any other way - by oil descending through the head drains or a compromised vacuum extraction system, etc, the oil will be pressure-fed up through that drainpipe also. I filled the stock oil separator (above) in just 2 seconds with only 15 psi of shop air.

Anyway - the idea of this restrictor is to reduce the flow of oil UP the drain pipe long enough that you can get out of the corner and on the brakes again.

I know you know all of this - I am just repeating myself for the benefit of others who have not read this hold thread.

Like this whole crankcase ventilation/oil control problem.... this is not THE answer - this may be one of many little answers that, when used together - solve the problem.

GlenL

Carl,

Is there something internal like a one-way valve?

havikrs

Hi Guys,

My name came up a few times.....time to introduce myself and step into this thread. I am going install the new bits next week to prepare the car for the weekend of 6-9th of july. The porsche days in Zandvoort. 4 stints a day of 45 minutes. another +/- 10 hour run for the car. when I take apart the underside of the engine I will make pictures of the bearings, etc... and will put them here.

regards,

Rob