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12-21-2014, 12:10 PM | #89 | |
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I do thing M cars are a little different. M's of old were high maintenance right out of the box but would last a long time. Newer M's will last 100k with relatively low maintenance until its out of warranty...then either cost you an arm and a leg or just fall apart.
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12-21-2014, 12:32 PM | #90 |
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Every chain has a weak link. This car was awesome in 2007 when it was released, and it still is a car to own. Others are jut now catching up you could argue.
~$2500 for bearings is less than you'll pay for many things on these cars. As long as it doesn't blow up catastrophically first. |
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12-21-2014, 02:58 PM | #92 | |
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12-21-2014, 04:22 PM | #93 |
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Will they be more "proven" than VAC? Lol.
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12-21-2014, 05:58 PM | #95 |
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WPC better than VAC, since VAC is a coating and actually makes it thicker making problem worse. WPC is a treatment changing the surface structure and actually makes the bearing slightly thinner in the process.
This bearing with the proper clearance + WPC treatment would be awesome, what ill get if/when I crack my engine open again. Glad to see progress is being made to get engine parts with better clearance.
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12-21-2014, 06:22 PM | #96 | |
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12-21-2014, 07:44 PM | #97 | ||
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They should have poached some Honda engineers before building these engines, lol
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12-23-2014, 11:01 AM | #99 |
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12-23-2014, 05:15 PM | #101 |
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VAC is "proven" to not work, if that's what you mean. I don't have the thread bookmarked, but an M3 guy from another forum had VAC-treated bearings on his car that he opened up again after 25K miles (and something like 80 track days), and the coating was all burned off and it was grinding into the bearing again. So best case scenario, they briefly, very briefly, delay the inevitable. Worst case, they make tight clearance even tighter and cause the problem to happen faster.
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12-23-2014, 05:29 PM | #102 | |
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12-23-2014, 07:13 PM | #105 |
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That's epic. So much for the bearing issues worldwide.
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12-23-2014, 08:39 PM | #106 |
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Sorry to bring this up but I'm really happy this is been addressed and bravo for the work. I had mine replaced with wpc cause it was only option at the time and if you see my thread on it I was really due. But has any one look into main bearing (the bearing the holds the crank in place) if they are also faulty. Rod bearing and main bearing probably same spec. Main bearings may also need replacing
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12-26-2014, 12:40 AM | #107 | |
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My specification software says that the main bearing clearance is .020mm-.055mm which is ~.0008-.002" For an aluminum block motor that main bearing clearance range is not an issue. Secondly, as indicated by the detailed teardown pictures & tolerance inspection, a major component of the problem for the rod bearings is that there's practically no side clearance. Main bearings (excluding the single thrust) don't have this issue as they're completely open to the crankcase on either side so oil can freely exit the bearing. That's assuming the engines are actually assembled to the clearance specification I have, and as you postulated, the rod bearings have basically the same specification which is too tight for a steel connecting rod in a performance application. |
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12-26-2014, 03:46 AM | #108 |
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as indicated by the detailed teardown pictures & tolerance inspection, a major component of the problem for the rod bearings is that there's practically no side clearance.
The section on side clearance in the engine teardown on page 1 of the Wiki bearing thread which notes the shock horror of finding a side clearance issue is totally opposite to the detailed description of the same engine teardown originally completed in 2011 in the Van Dyne shop. In that write up by Regular Guy (as Pencil geek) they send off for a BMW crank and rods which they use to measure the side clearance in order to machine the out of spec Carrillo rods to the right clearance. Also main bearing failure in S65 engines are very rare. |
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