sick of ims bearing

[JFP in PA]

Originally Posted by flmont

It would be nice to have someone make a plane bearing like Jake's without the oil feed cheap in easy,..

They can't, the design is patented.

[PaulE]

Originally Posted by flmont

It would be nice to have someone make a plane bearing like Jake's without the oil feed cheap in easy,..

Originally Posted by JFP in PA

They can't, the design is patented.

Plus a plain journal bearing needs a constant supply of pressure fed oil to keep the two metal surfaces separated by a thin film of oil, otherwise the bearing will fail immediately.

[Lapister]

I totally agree that the IMSB issue is overblown. If you are a Wrencher a engine is a engine whether it be a Porsche or Toyota. I read all the hype about this but couldn’t let it scare me from owning one and experiencing it. I have since sold the car after TB, 987 Airbox, and 997T upgrade but would not hesitate to buy another 986/87 if a nice one comes my way.

[JFP in PA]

Originally Posted by PaulE

Plus a plain journal bearing needs a constant supply of pressure fed oil to keep the two metal surfaces separated by a thin film of oil, otherwise the bearing will fail immediately.

Jake actually tested what would happen if the oil feed failed by disconnecting and plugging the line, the answer after a prolonged period of running was “nothing”. Oil feed cools and prolongs the life of the plain bearings, but the splash oil mist seems to do a pretty good job in the short term.

[Homeoboxter]

Originally Posted by JFP in PA

Jake actually tested what would happen if the oil feed failed by disconnecting and plugging the line, the answer after a prolonged period of running was “nothing”. Oil feed cools and prolongs the life of the plain bearings, but the splash oil mist seems to do a pretty good job in the short term.

Actually the oil film is mostly provided as the shaft is submerged in oil, mist and splashed oil would not be enough to keep a plain bearing alive for too long.

[JFP in PA]

Originally Posted by Homeoboxter

Actually the oil film is mostly provided as the shaft is submerged in oil, mist and splashed oil would not be enough to keep a plain bearing alive for too long.

It did during his tests, but no one really knows how long it can run that way.

[SC-986]

Originally Posted by JFP in PA

Oil feed cools and prolongs the life of the plain bearings, but the splash oil mist seems to do a pretty good job in the short term.

JFP covered this on page 2 of this thread. The premise behind DOF whether with Jake’s “Solution” or TuneRS/Pedro’s system is bearing cooling and more precise oiling of the bearings.

[Homeoboxter]

Originally Posted by SC-986

JFP covered this on page 2 of this thread. The premise behind DOF whether with Jake’s “Solution” or TuneRS/Pedro’s system is bearing cooling and more precise oiling of the bearings.

I understand the premise, and I don`t doubt it`s true. I`m just not convinced about it`s necessity and that DOF on it`s own makes a difference.

[JFP in PA]

Originally Posted by Homeoboxter

I understand the premise, and I don`t doubt it`s true. I`m just not convinced about it`s necessity and that DOF on it`s own makes a difference.

You and a whole lot of other people when it comes to "open" bearings (ball or roller type), solid bearings are another story however...….

[Homeoboxter]

Originally Posted by JFP in PA

You and a whole lot of other people when it comes to "open" bearings (ball or roller type), solid bearings are another story however...….

Yep, plain bearings require oil feed usually. Although they are usually applied where constant oil supply (immersion) is not available, like at the crankshaft, camshaft, etc.. At these bearings if the pressure drops in the oil line they fail. Motorcycle engines are often fitted with plain bearings without pressure oil feed, they are just submerged into oil, or the rotating parts transfer oil onto them constantly (splashing), and oil can flow in spiral oil channels between the bushing and the journal. Sometimes these bearings have oil pockets where the oil can sit in and can serve as a constant oil cushion to the journal. They work pretty well and never fail. It`s possible that a plain bearing designed for benefiting oil immersion would work at the IMS, as you mentioned before that nothing happens (for a while) if you disconnect the oil supply to the plain IMSB. This is just theoretical of course, I wouldn`t risk trying it.