New oil control solution for Race/ORR/SC/Stroker/GTS/GT/CS/SE/S4/S3 928 Engines
03-01-2019, 01:31 PM
#421
Drifting
Would the oil passing through the intake at Vmax eventually cause pinking that would be detected by the knock sensors
If so, presumably it would be very obvious that the ignition was being retarded because the speed would instantly drop away
Or does it not work like that?
If so, presumably it would be very obvious that the ignition was being retarded because the speed would instantly drop away
Or does it not work like that?
03-01-2019, 01:39 PM
#422
Rennlist
Basic Site Sponsor
Basic Site Sponsor
I did a high speed run on the Autobahn with a stock '87 S4 on Saturday, running the engine in top gear at various engine speeds over 5000 rpm for a minute and holding it for about 10s at 6000 rpm.
I coasted half a minute later to be met with a very strong smell of burnt oil which disappeared after about 5s.
The engine is healthy with no black, blue or white smoke coming out of the exhaust, strong oil pressure, no overheating.
My bet is that oil got sucked in through the intake during the sustained >5000 rpm run, was burning in the cylinders and the smell just caught up when I came to a stationary point when after 5s the excess of oil in the intake eventually got completely burnt as the engine was running at low speeds again.
I coasted half a minute later to be met with a very strong smell of burnt oil which disappeared after about 5s.
The engine is healthy with no black, blue or white smoke coming out of the exhaust, strong oil pressure, no overheating.
My bet is that oil got sucked in through the intake during the sustained >5000 rpm run, was burning in the cylinders and the smell just caught up when I came to a stationary point when after 5s the excess of oil in the intake eventually got completely burnt as the engine was running at low speeds again.
03-01-2019, 01:49 PM
#423
Good times. Good times. When is the next lunch? We can hoon in the Z51.
03-01-2019, 02:46 PM
#424
Drifting
03-01-2019, 03:03 PM
#425
Its really great. 150 miles a day = Nearly 30k since April. One radiator and a bunch of interesting noises, but always fun. Ungodly grip, and comfortable. Need to track it. Or sell and get a Z06 since they are getting to be bargains as well.
03-01-2019, 09:30 PM
#426
Rennlist
Basic Site Sponsor
Basic Site Sponsor
I had some issues with cars that had extreme oil consumption (two GTS's), which required the Provent filter to be changed a couple of times, before the engine would "seal up" again. One system got returned (the oil consumption decreased radically, until the filter got plugged, and the client tried something else, without considering simply changing the filter) and the other we changed the Provent filter a couple of times. Kind of a "pain" to nursemaid the people through this..they wanted instant oil consumption cure, in a box, which is almost impossible once the engines are really "gunked" up and use copious amounts of oil.
I made some systems with a custom modified oil separator (instead of the Provent), and this worked really great (no filter to mess with) but the cost of the complete system is high (the cost of the oil separator is $500, before a few hours of modification, which drove the complete kit to over $2500.)
Conservative me is now suggesting to people to install my valve cover breather pieces ($50 per valve cover elbow....you would need four, with a couple/three additional valve cover elbows) and my crankcase oil separator ($95), drive the car for a month, and see if they need more.
If they need more, the valve cover breather pieces and the crankcase oil separator are required for the entire kit anyway, and we can then just add the rest of the required pieces to those pieces.
__________________
greg brown
714 879 9072
GregBBRD@aol.com
Semi-retired, as of Feb 1, 2023.
The days of free technical advice are over.
Free consultations will no longer be available.
Will still be in the shop, isolated and exclusively working on project cars, developmental work and products, engines and transmissions.
Have fun with your 928's people!
greg brown
714 879 9072
GregBBRD@aol.com
Semi-retired, as of Feb 1, 2023.
The days of free technical advice are over.
Free consultations will no longer be available.
Will still be in the shop, isolated and exclusively working on project cars, developmental work and products, engines and transmissions.
Have fun with your 928's people!
03-02-2019, 12:07 AM
#428
Rennlist Member
03-02-2019, 04:11 AM
#430
Addict
Rennlist Member
Rennlist Member
For track use, it's a different story. A lot more running the engine in lower gears at higher rpms, with higher g forces in turns and while braking, which will move the oil around in the oil pan. Under these conditions the 928 engine is a lot more susceptible to low oil pressure conditions and have rod bearing failures. So no guarantee on how long your engine will last on the track.
__________________
George
90 S4 Grand Prix White (Murf #5 - 210 mph top speed)
94 GTS 5-Speed Midnight Blue
06 Cayenne S Havanna/Sand Beige (PASM)
http://928.jorj7.com
03-02-2019, 09:01 AM
#431
03-02-2019, 12:09 PM
#432
Rennlist Member
Sorry. I don't look at Email through Precision often enough.....
I had some issues with cars that had extreme oil consumption (two GTS's), which required the Provent filter to be changed a couple of times, before the engine would "seal up" again. One system got returned (the oil consumption decreased radically, until the filter got plugged, and the client tried something else, without considering simply changing the filter) and the other we changed the Provent filter a couple of times. Kind of a "pain" to nursemaid the people through this..they wanted instant oil consumption cure, in a box, which is almost impossible once the engines are really "gunked" up and use copious amounts of oil.
I made some systems with a custom modified oil separator (instead of the Provent), and this worked really great (no filter to mess with) but the cost of the complete system is high (the cost of the oil separator is $500, before a few hours of modification, which drove the complete kit to over $2500.)
Conservative me is now suggesting to people to install my valve cover breather pieces ($50 per valve cover elbow....you would need four, with a couple/three additional valve cover elbows) and my crankcase oil separator ($95), drive the car for a month, and see if they need more.
If they need more, the valve cover breather pieces and the crankcase oil separator are required for the entire kit anyway, and we can then just add the rest of the required pieces to those pieces.
I had some issues with cars that had extreme oil consumption (two GTS's), which required the Provent filter to be changed a couple of times, before the engine would "seal up" again. One system got returned (the oil consumption decreased radically, until the filter got plugged, and the client tried something else, without considering simply changing the filter) and the other we changed the Provent filter a couple of times. Kind of a "pain" to nursemaid the people through this..they wanted instant oil consumption cure, in a box, which is almost impossible once the engines are really "gunked" up and use copious amounts of oil.
I made some systems with a custom modified oil separator (instead of the Provent), and this worked really great (no filter to mess with) but the cost of the complete system is high (the cost of the oil separator is $500, before a few hours of modification, which drove the complete kit to over $2500.)
Conservative me is now suggesting to people to install my valve cover breather pieces ($50 per valve cover elbow....you would need four, with a couple/three additional valve cover elbows) and my crankcase oil separator ($95), drive the car for a month, and see if they need more.
If they need more, the valve cover breather pieces and the crankcase oil separator are required for the entire kit anyway, and we can then just add the rest of the required pieces to those pieces.
I like that approach and is what I was thinking after discussing with Seth. I will call Monday and order the valve cover baffles, Oil fill baffle, and 4 elbows
03-02-2019, 02:40 PM
#433
Nordschleife Master
From what he has posted, it sounds more like they keep the liquid oil level from reaching and plugging up the breather outlets.
The info I have comes from the thread where he announced the availability, and put the restriction that nobody post pics of what they look like (which is completely understandable):
https://rennlist.com/forums/928-foru...s-special.html
