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01-14-2016, 02:50 AM | #89 | |
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Seeing a set of wear free rod bearings pulled from a supercharged car after 33,500 miles at least show the results of some real world usage of the product. IIRC BE initially suggested they would be testing their bearings before release but instead jumped to letting the early adopters do their testing for them. |
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01-14-2016, 07:03 PM | #90 | ||
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01-14-2016, 07:53 PM | #91 |
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Wow some people are a few years late to the party and think a 3min call to someone makes them an expert and that company has nothing in it or is in any way bias? Of course they are going to say they have a solution, they want business. How about they design a solution present some facts and then let consumers decide?
Most guys who understand engines know the bearings with more clearance aren't the 100% solution but it is the best solution without dropping the motor and doing a full rebuild. They buy you more time than the factory bearings and if treated like a wear item has a better chance of surviving for more miles. |
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01-14-2016, 08:09 PM | #92 | |
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Edit: All this talk, i just sent him the pic and said this: Wow! That looks like insufficient clearance / oil starvation to me. As you can see they are wiped at what would be TDC and BDC of the stroke because there wasn’t enough oil film.
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01-14-2016, 09:48 PM | #93 | |
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01-14-2016, 09:58 PM | #94 | |
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01-14-2016, 10:00 PM | #95 | ||
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This is sounds like a infomercial for the slap chop. Seriously. Rod bearings will never ever in a million years fix the problem. Only prolong it. |
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01-14-2016, 10:03 PM | #96 | |
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01-14-2016, 10:13 PM | #97 | ||
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01-14-2016, 10:15 PM | #98 | |||
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01-14-2016, 11:57 PM | #99 | |
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01-15-2016, 02:50 AM | #100 | |
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Nothing wrong with a pre-emptive RB swap just don't be expecting under sized bearings to increase reliability. Last edited by Sneaky Pete; 01-15-2016 at 03:40 AM.. |
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01-15-2016, 06:41 AM | #102 | ||
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Also a tremendous amount of speculation and a lack of fact. Clearly everyone isent going to pull their crank out and measure in the interest of science. |
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01-15-2016, 07:45 AM | #103 | ||
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01-15-2016, 10:21 AM | #104 |
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I think the E10 fuel issue explaining rod bearing failures on high rpm motors is interesting. Not yet sure I buy into it since it depends on a certain amount of fuel leakdown into the oil. But would like to read more.
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01-15-2016, 10:33 AM | #105 | |
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Oh and to correct a post I made in a different thread, company making all the stroker cranks is Marine Crank. |
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01-15-2016, 11:32 AM | #106 |
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Looking at the commonality in engines failures gives the following to a greater or lesser degree:
Higher air intake temps (location) Lower quality fuel (location) Greater usage of higher rpms (tracking). One of the features of the S65 is the use of fairly unique (at least to BMW) coil on plug ionic sensing anti knock technology....combined with a target based ignition system. The system strives to reach its ignition target relying on the CoP ionic sensing system to pull ignition whenever the system detects knock. Its a great system but it requires 100% efficiency of the components of the system for 100% of their lifetime. Either higher air intake and/or lower fuel quality will greatly increase the intervention of the anti knock system such that in extremis it will be operating nearly full time. ...whereas in a cool climate with higher quality fuel the anti knock system will be triggered far less (if at all). A combustion related cause for accelerated bearing wear has at least the benefit of fitting in with the various trends in engine failures that have been noted elsewhere. Its also far more credible that the application of fairly new immature technology could have an unexpected impact on reliability as opposed to a fairly straight forward easily adjustable rod bearing specification. |
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01-15-2016, 03:24 PM | #108 | |
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Last edited by Rajmun340; 01-15-2016 at 03:35 PM.. |
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01-15-2016, 03:33 PM | #109 | ||
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01-15-2016, 04:14 PM | #110 |
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I'd put the mechanical knowledge of the average bmw customer as very low. There are a bunch of knowledgeable people contributing here, although you disparage them as if you have some axe to grind against them. I do agree that BMW engineers are smart and aware of a growing number of engine failures. But they are not weighing in. Not sure why -- could be because they do not think there is a problem, because there is a problem they can't do anything about, or because lawyers and accountants are stopping them.
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