track 928 oil pressure drop?????UPDATE FILTER OPEN :>(
#106
Nordschleife Master
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> Here's something I've learned by searching the forums: For their cup-car
> prototype, Porsche installed the 944-2 oil pressure relief valve to the cylinder
> head. See http://www.norcal928.org/928cup/928CupSpecs.pdf. The part
> number is 944.107.139.00, or 42 in the picture in the link:
> http://dcauto.gotdns.com/illustration/index/438291925. Anybody with any
> theories what this accomplishes?
So we did they do it?
> prototype, Porsche installed the 944-2 oil pressure relief valve to the cylinder
> head. See http://www.norcal928.org/928cup/928CupSpecs.pdf. The part
> number is 944.107.139.00, or 42 in the picture in the link:
> http://dcauto.gotdns.com/illustration/index/438291925. Anybody with any
> theories what this accomplishes?
So we did they do it?
#107
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> Here's something I've learned by searching the forums: For their cup-car
> prototype, Porsche installed the 944-2 oil pressure relief valve to the cylinder
> head. See http://www.norcal928.org/928cup/928CupSpecs.pdf. The part
> number is 944.107.139.00, or 42 in the picture in the link:
> http://dcauto.gotdns.com/illustration/index/438291925. Anybody with any
> theories what this accomplishes?
So we did they do it?
> prototype, Porsche installed the 944-2 oil pressure relief valve to the cylinder
> head. See http://www.norcal928.org/928cup/928CupSpecs.pdf. The part
> number is 944.107.139.00, or 42 in the picture in the link:
> http://dcauto.gotdns.com/illustration/index/438291925. Anybody with any
> theories what this accomplishes?
So we did they do it?
It would be nice to actually see the movie it refers to that's about the oil pan modifications!
#108
Three Wheelin'
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> Here's something I've learned by searching the forums: For their cup-car
> prototype, Porsche installed the 944-2 oil pressure relief valve to the cylinder
> head. See http://www.norcal928.org/928cup/928CupSpecs.pdf. The part
> number is 944.107.139.00, or 42 in the picture in the link:
> http://dcauto.gotdns.com/illustration/index/438291925. Anybody with any
> theories what this accomplishes?
So we did they do it?
> prototype, Porsche installed the 944-2 oil pressure relief valve to the cylinder
> head. See http://www.norcal928.org/928cup/928CupSpecs.pdf. The part
> number is 944.107.139.00, or 42 in the picture in the link:
> http://dcauto.gotdns.com/illustration/index/438291925. Anybody with any
> theories what this accomplishes?
So we did they do it?
#109
Administrator - "Tyson"
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> Here's something I've learned by searching the forums: For their cup-car
> prototype, Porsche installed the 944-2 oil pressure relief valve to the cylinder
> head. See http://www.norcal928.org/928cup/928CupSpecs.pdf. The part
> number is 944.107.139.00, or 42 in the picture in the link:
> http://dcauto.gotdns.com/illustration/index/438291925. Anybody with any
> theories what this accomplishes?
So we did they do it?
> prototype, Porsche installed the 944-2 oil pressure relief valve to the cylinder
> head. See http://www.norcal928.org/928cup/928CupSpecs.pdf. The part
> number is 944.107.139.00, or 42 in the picture in the link:
> http://dcauto.gotdns.com/illustration/index/438291925. Anybody with any
> theories what this accomplishes?
So we did they do it?
Mine ate up a rod bearing without any track use.
#112
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The very first person that I ever heard mention using the 944 valve to restrict oil going to the heads in a 928 ended up blowing the 2/6 rod bearings in his car.
#113
Electron Wrangler
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Alan
#114
Three Wheelin'
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That and Mark's disciplined procedure of no high RPMs in corners. I think Mark's good luck isn't all luck. Redline is good oil too. I use both. Amsoil pours "thinner" at room temp than Redline. Both 20W-50. Maybe Redline has fewer viscosity modifiers. Hot oil pressure is good with Amsoil. I've heard that fleet oil, and diesel oil for the non foaming properties and higher zinc is good too although I have no direct experience. Delo from Standard Oil and Shell makes some too, Rotella I think.
#115
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On the 944/951 it's the #2 bearing, on the 928 it's the 2/6 bearings. Those are apparently the most common ones to go, but other cylinder's bearings have also been the ones to fail from what some 928 owners have told me that they experienced over the years.
#116
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2/6 have already been labelled as detonation prone.
Detonation hammers the crap out of your bearings - even if they have oil.
There is no one magic cure for these problems, it is an oil system, and as such, you must take a system approach to it.
#117
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Redline non-race oil has quite a bit of a detergent package from my experience. I like it alot.
#118
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I can understand keeping the rpms down. I've found my autocross laps are faster if I short shift and keep the revs down below 5500. Maybe that's just the x-pipe talkin.
#120
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This year, amsoil has traded a lot of the detergents with more zinc with its 15-50 racing oil. i guess if you are changing the oil as often as I do, its probably a good trade off. (every 3 races, the oil gets changesd)