Mar-01-2012 05:53 AM
Jan-23-2013 01:04 PM
Jan-23-2013 06:42 AM
NewsW wrote:NinerBikes wrote:
VW is experiencing far, far fewer failures with running the same design, smaller piston bore, longer stroke from the cam and limiting max pressure developed to 1800 bar pressure.
Wasn't lower pressure what Krebs, or was it Jodl recommended to the leader?
Dec-08-2012 12:16 PM
NinerBikes wrote:
VW is experiencing far, far fewer failures with running the same design, smaller piston bore, longer stroke from the cam and limiting max pressure developed to 1800 bar pressure.
Dec-08-2012 11:43 AM
BenK wrote:
Agree, it all points back to this area as the root cause
Have said using a cam instead of a crank is wrong for this type of PSI.
Again, mystified how the highly educated designers can deem okay to go to DLC
on a roller with this level of PSI.
That has sooooo many failure or potential failure issues just looking at it from
the outside. From the 'dent' the roller and cam 'will' have and made worse at
shutdown. Where the poor lube is squeezed out to then have a dry cold start, albeit
the PSI's won't be as high on the first rotation...till the piston develops 2,000 BAR
Again, DLC or diamond is the best known non-stick material known to mankind. How
does a very poor lube like diesel manage to both coat (film strength) and during
shutdown/over-nite keep a film on there to prevent dry starts?
ANY roller/cam miss-alignment will cause scuffing of material and maybe
that is yet another reason they went to DLC, but then an oxymoron, as the roller
needs some level of traction to start rolling. Otherwise it will skid
What is the cam rotational speeds, both RPM and SFPM? Is the follower spring
force high enough to prevent floating it off the cam?
Betcha on that, that the piston floats because I've not seen any spring pushing
it against the follower, nor positive capturing mechanism
A journal bearing would have been a better choice, but that won't work on a cam
and say look a any ICE's crank/rod bearing...but that would be more expensive...
Dec-08-2012 11:26 AM
Dec-08-2012 10:13 AM
Dec-08-2012 09:09 AM
Dec-07-2012 07:11 PM
stsmark wrote:
Only because it had played out. It was headed nowhere.
Dec-07-2012 06:51 PM
Dec-07-2012 01:25 PM
Arizona1 wrote:
Rick,
The thread you spoke about over at TDS was closed today or yesterday. Well...... They let it go for a little while.........
NewsW wrote:
OK, lets start betting on the thread.
1 round of drinks (for the 3 of us) that it will be gone by 12/08/12 noon.
Dec-07-2012 01:23 PM
Dec-07-2012 02:27 AM
NinerBikes wrote:
Another glaring fault by NHTSA... They did NOT request the number of HPFP failures of Jetta Sportwagens "JSW"s with bad HPFP's in their data requests of Volkswagen of America.
Here's a link to some raw data failures of number of replaced HPFP's in VW's, by area, by state, by date.Excel file of failures
There's a sh*t ton of these failures, and the data is missing for All 2009 to 2012 jetta Sport Wagen TDI's in here, also... evidently NHTSA forgot to ask about that model also.
Dec-06-2012 09:31 PM
Dec-06-2012 08:49 PM
NewsW wrote:
The paper trail made public is rather... um... not nice to read.
Dec-06-2012 07:06 PM