About 7 years ago I posted on this forum that I was having low oil issues. No one was discussing what is being discussed in this thread, and I'm glad I found this.

There are some roads in northern California that are sustained climbs with a ton of twists. The best roads on the planet. I guess I must be putting this car to it's limit, because every time I pushed up these roads I ended up having to stop because of the flashing red low oil warning light.

Now that I've had a chance to go over my engine after all of these years I can see my cam end plugs are in good shape. So that was not the issue. And it appears you guys are addressing the problem.

 

Some other local 928 owners noticed severe pressure drops when driving on really steep hills...like some in SF.....which makes sense looking at the design of the pan.....all the oil just spills to the back at steep angles for any sustained amount of time....

 

I don't see a problem with that. I've had my car foot-to-the-floor at over 165 MPH for miles and basically kept it close to that for distances approaching 100 miles. I did this a number of times in open road racing in Nevada over the years. Now, at 229K miles (160K of which are mine), the motor is still untouched and has no mechanical issues. I did have substantial oil loss in the breather system, but nothing of magnitude described here. I think stock motors have no serious problem with foot-to-the-floor driving on common roads. Stroked or blown motors, especially running around a track or Lombard Street in San Francisco, face more serious issues.

 

Is there more blow by upon acceleration or at steady rpms? Or is it essentially the same(which I assume is true)

andy

 

For us close to stock guys, I'd not be overly worried about straight line, foot planted driving. Now if you start taking corners at 6k rpm I'd be a bit worried.

 

Unless your MK....

I think that guy must be pretty loose with the size of the horseshoe he must have hidden away...

 

He's no longer stock...

 

It looks like the guys that drive these down the Autobaun at high rates of speed might not completely agree with you...go back and read the part of this thread, regarding that.

 

I couldn't find anything in this thread about Autobahn driving issues. All I know is that after averaging over 152 MPH in the Silverstate two years ago for 90 miles while topping out at 165+ for long stretches, after several years of doing similar top speed cruising (and over 170 when I had the supercharger) averaging 145 MPH for a number of similar races, the car has suffered no mechanical mishaps. I had a lot of oil consumption at these sustained high speeds; otherwise none in daily driving. Even with my 2.54 rear end I'm not even turning 6K RPM flat out at 165. Of course, you are facing a much different situation with your motor and what is planned to be done with it. I just don't see a particular problem with what the other guy was questioning - going flat out down the road for a few minutes with a stock motor. I've done it many times for stretches of 20+ minutes.

 

There has been epidemic of engine blowups on German autobahn to late MY 928 since they were new. Fill up the fuel tank and check that oil is full, proceed to drive 150mph'ish at the bahn, engine will blow up from lack of lubrication before tank is empty. 100 miles almost constant flat out might not be enough but fuel tank will last 200-250 miles and that has proven to be too long.

 

Are there any lessons to be learned from the Panamera?

 

Time to make an adapter for a powerglide and 9" and go Drag Racing. Short and Sweet.

 

Thank you for the pressure readings, John! For my street-only (but still pushed on ocassion) stroker, that helps me decide between plugging up the cam covers completely vs. having inlet-only breathing there. If there are occassions when vacuum occurs in the block, then I will put in the inlet only breathers on the cam covers. I understand that block vacuum is supposed to be good for performance, in general, but I'm not so sure on our motors.

 

Can't find much on the Pana, but here is a link to a good article on the new Ford Coyote 5.0...page 11 has some info on their oil and breathing problems- just like ours. They solved them with the bigger drains on the outside of the block combined with passages from the center of the crankcase into the heads. Look at how they shield the drainback exits in the pan from the crankwash. Also note the drainbacks are large compared to ours....

/www.mustang50magazine.com/techarticles/m5lp_1003_2011_ford_mustang_gt_50_coyote_engine/name_game.html

 

928 has 4 holes for drain back on each side and this mustang engine has 3, so maybe its not much of a difference.