gt37vgt

but still faster than you ... geez

Chris White

What can I say? I like fast women...

ausgeflippt951

Chris -- thanks for the info, very interesting.

I just had a quick question re: your comment about the 90* bends in the oil passages and Porsche never intending to race the motor:

In the racing 944 world, is anything done to the oil system of the car to help with this issue (besides the obvious dry sump)? Specifically, these 90* bends? Having never built a pure race motor for a 944, I've got no experience with this.

Chris White

There is not a lot you can do other than making a crank from billet stock (and that has a lot of issues too – the hardening of the factory crank is very hard to reproduce).

Some folks like to cross drill the crank but that does not help the 90 degree bends. One thought I had a long time ago would be to extrude hone the oil passages in the crank. That would be an interesting project.

I have found that if I don’t over fill the crankcase and the oil temps are kept to a reasonable level the engine will be OK. If you want sustained running over 7k….then you should think about a drysump system!

JustinL

So it sounds like the most cost effective approach is an extra oil cooler and oil pan baffles. Would you agree with that Chris?

Bill N

+1 Thank you, Chris, wonderful summary and analysis.

JDS968

In addition to baffles, would a crank scraper help here, to reduce oil being sucked up into the windage, or is that not a significant factor here?

Chris White

‘Yes’ on the oil cooler and ‘maybe not so much’ on the pan baffles. The pan baffles don’t hurt but I don’t think they help with the oil ‘slosh’ .

You guys are welcome! Glad to help out.

I think the crank scrapers do help and the full windage tray helps even more (but is time consuming to fit!)

gt37vgt

I spent most of my money on fast cars and fast women the rest i wasted ... drilling the big ends at 90 deg or radial to the crank provides a passage to the big end with a 30 deg bend insted of a 90 also its a pretty reasonable theory that this passage would kind of pump with a bit with crank speed .
I think extrude honing the entire oiling system is a great idea Chris i herd somewhere the extrude honning process was developed initaily for debuting inside complicated hydralic valve body assemblies ..

Willard Bridgham 3

Doesn't anyone remember the Turbo Cup series in Europe? The Turbo S cars are a result of Porsche's input to the series.

Remember the GT cars?

They may not have won LeMans, but they were racing with engines developed by Porsche for racing.

Chris White

Yes, I am afraid, like you, I am old enough to remember those!

Turbo cup was close to a ‘stock class’ – no internal engine mods allowed. They had to live with the design.

GT cars…dry sumped…problem fixed!

LeMans cars – the early version was a 2.5 liter DOHC motor that was also dry sumped….I don’t know a lot about the later ‘BF Goodrich’ LeMans effort…

gt37vgt

not all race cars are the ultimate in terms of development there are plenty of one make clases that are very compromised to "try" to keep costs down and sometimes to even make the racing better to watch .
Sometime manufactures even have a massive piles of surplus parts they want to destroy in an entertaining fashion ...ok lets have a race series .