924Board.org

[kike924]

I have learned from a friend who races a 924 (N/A 1979 US model) that you have to use more oil in the sump when racing to avoid the engine running dry in right curves.
I was wondering if you use this method and how much oil you put inside your cars.(I'm using 10W40 semisinthetic with lubro-Moly added)
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Euro 924 1980 N/A
Daily driver + week end racer

[924RACR]

I can appreciate and understand this. However, such that I ever had time to watch the gauges at that point (not much!), I never saw any problems due to right hand cornering explicitly. Certainly a dry sump would be a very nice improvement, though!

I have run Mobil 1 (the street type - I guess there's a pure race type they sell that is different). I have also blown up a few engines this year. Prior to doing so, the inside of the engine was stock, no oil control mods. Note that we run on radial racing tires, not slicks/bias ply. So, we have a sllightly lower cornering ability than you might.

Anyway, the first failure was due to a spun bearing on the #4 rod. This was entering the 4th season on the motor; I should have rebuilt sooner, perhaps after the second year, but I didn't yet know enough to do so.

The second motor failure was the same internals (just replaced bearings); the same rod, which I should have replaced, siezed presumably due to loss of oil pressure. That rod is junk, as is another crank.

The last motor I trashed was a junkyard motor bottom end; I haven't taken it apart yet, but it was very low on oil pressure while racing (essentially none). Still runs, but low on pressure, probably has at least one spun bearing.

I'm gonna need some more cranks before long!

In the meantime, since the first failure, we made a windage screen from some one-way screen for the motor - bolts onto the main bearing caps. Fits pretty tightly to the pan, think it'll work pretty well if I get it in a good motor. I have a library of pics taken during the fabrication which I need to post someday.
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

[kike924]

Thank you for your complete and informative answer, I´m betting that the additive (Lubro-Moly) that I use should protect the metals in the corners if they get a little dry.
I have studied the subject an apparently molybdenum bisulfur is very useful in protecting the engine in cold starts and such.
They made a test years ago in Argentina with a jeep that did many laps in a circuit without oil !!! before melting the engine.
Most Porsche owners here use it (specially those with old cars)
For those of you that are suspicious I work for a Pharmaceutical Company and have no ties with the makers of this additive
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Euro 924 1980 N/A
Daily driver + week end racer

[924RACR]

Quite true; I plan on changing to a different oil, I think I'll either try Redline or Amsoil instead this time (based on many good comments I've heard from users on rennlist racing forum).
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

[TMB-Racing]

I have had the oil pressure light come on- on our hometrack (Pacific raceway's) on a right hand corner following what is equilvalent to a 11? story drop. It is a very high g corner. I overfill about 1/8 of an inch over the full line on the dipstick and that solves the problem. I run the redline race oil. The street oil has detergents that help keep your engine clean while the strictly racing oils have more lubricating properties. We had a Z car go down the entire straight after losing his oil plug with no ill effects using redline. I used amsoil in my 944 and had good luck also-but am a huge believer in the redline and factory oil filters. Andrew
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1 of 100 Sebring M471's ( G-prod racecar)
1977.5 GTU (Autocross/hillclimb car) 2006, 2007 ITB lap record holder-Larison rock Hillclimb

If speed kills, why am I still alive?

[AndyFranklin]

The corner workers must have loved that guy.... Probably some 95 degree day, too. I have a fantasy that the next driver that does a similar "Exxon Valdez" act comes out to help sweep.

Oil PRESSURE is only needed when the engine is under load. Pressure and circulation/lubrication are somewhat independent.