Autopsy of a "good" IMS bearing

[Jake Raby]

Originally Posted by jdlmodelt

Well now that is interesting. Too low of a viscosity lubricant. I've been wondering about running a heavier oil in my engine. Like the 10W40 that my original owner's manual indicates as opposed to the 0W40 that everyone talks about now. Is the tolerance on the Porsche engines from the 2.5l engines as tight as the new Hondas that indicate 5W20? I compare to a Honda engine because they run for multi 100k without coming apart. ???

No, and the engines lose a ton of internal clearance during expansion. With %/20 oil you'll be opening a can of worms that you won't like. The oil pump in these engines suffers greatly from internal losses due to clearances changing with thermal expansion, which makes it all worse.

I have developed another product to help with these losses and its going through the patent processes now.

5/20 oil might work fine in the M96 engine if operated in the Arctic, otherwise you'll have issues with valve lash, hydraulic tensioners and many other issues. This has been proven through direct experience and development on the street, track, dyno and otherwise with the M96 engines as our only focus. What the IMSB likes, isn't necessarily what the engine likes as a whole, that is unless you finally just suck it up and install the IMS Solution and allow your engine's oil to support the loads of your IMSB by taking that damn ball bearing out of the equation altogether.

[jdlmodelt]

Thanks Jake, That's interesting how they built the engine around such strange tolerances. How does Subaru get around this with their boxer engines that crank out some incredible HP per displacement? (of course Subies have head gasket issues). How about all those motorcycle engines out there with roller bearings located all over the place in the engine? Or is that just because of how the ball bearings are located and consequent loading in line with the bearing or a thrust loading?

Anyway, I appreciated the experiential response!

[Jake Raby]

Originally Posted by jdlmodelt

Thanks Jake, That's interesting how they built the engine around such strange tolerances. How does Subaru get around this with their boxer engines that crank out some incredible HP per displacement? (of course Subies have head gasket issues). How about all those motorcycle engines out there with roller bearings located all over the place in the engine? Or is that just because of how the ball bearings are located and consequent loading in line with the bearing or a thrust loading?

Anyway, I appreciated the experiential response!

Those other engines are not quite so impacted by the accounting department. Suby engines have 2X tighter running clearances than the M96, which is both a pro and a con, because tighter clearances lead to shear faster.

The M96 is the M96 and it isn't anything else. People refuse to listen when I say this, yet I have cars here from 30 states primarily because people treat them like something they are not.

[jdlmodelt]

So drive it regularly, get the RPM's up. pay attention to sounds, keep the oil changed with the right kind of oil, and enjoy the ride? Mine's a 2.5l