Re: Really weird bore wear - I'm stumped
Posted: Wed Oct 11, 2017 8:43 pm
Would it be for protection against bore lip damage from detonation?
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I'd not mind if they did it to ford 6.0 and 6.4, I'd not have as much work but then again I don't particularly enjoy working on those either. I'm not happy and customers are not happy. With the cummins everybody is happy.DaveMcLain wrote: ↑Wed Oct 11, 2017 4:31 pm Its tough to believe that's really necessary in a diesel application because I've seen a lot of those with a ton of miles and really very little cylinder wall wear. Assuming a regular cast iron block was used in the 5.9 Cummins, 7.3 Ford etc.
Unless it is all about the reduction of emissions. Maybe to allow a lighter ring package instead of the keystone type of top ring..
Just when you think you've see it all!1972ho wrote: ↑Tue Oct 10, 2017 7:33 pm https://www.gehring.de/sites/default/fi ... -en-ww.pdf Looks a lot like this.
Why Ford ever dropped the 7.3 is beyond me!modok wrote: ↑Wed Oct 11, 2017 8:53 pmI'd not mind if they did it to ford 6.0 and 6.4, I'd not have as much work but then again I don't particularly enjoy working on those either. I'm not happy and customers are not happy. With the cummins everybody is happy.DaveMcLain wrote: ↑Wed Oct 11, 2017 4:31 pm Its tough to believe that's really necessary in a diesel application because I've seen a lot of those with a ton of miles and really very little cylinder wall wear. Assuming a regular cast iron block was used in the 5.9 Cummins, 7.3 Ford etc.
Unless it is all about the reduction of emissions. Maybe to allow a lighter ring package instead of the keystone type of top ring..
Ring and cylinder wear has as much as doubled in recent engines with common rail and a lot of emissions mods compared how it was with mechanical injection. The duramax block and rings are AMAZING.....BUT.....you pay for it, 2-3x more fr every part.
The good ol' 7.3 would not meet current emission standards without a lot of rework.GARY C wrote: ↑Sat Oct 14, 2017 1:01 pmWhy Ford ever dropped the 7.3 is beyond me!modok wrote: ↑Wed Oct 11, 2017 8:53 pmI'd not mind if they did it to ford 6.0 and 6.4, I'd not have as much work but then again I don't particularly enjoy working on those either. I'm not happy and customers are not happy. With the cummins everybody is happy.DaveMcLain wrote: ↑Wed Oct 11, 2017 4:31 pm Its tough to believe that's really necessary in a diesel application because I've seen a lot of those with a ton of miles and really very little cylinder wall wear. Assuming a regular cast iron block was used in the 5.9 Cummins, 7.3 Ford etc.
Unless it is all about the reduction of emissions. Maybe to allow a lighter ring package instead of the keystone type of top ring..
Ring and cylinder wear has as much as doubled in recent engines with common rail and a lot of emissions mods compared how it was with mechanical injection. The duramax block and rings are AMAZING.....BUT.....you pay for it, 2-3x more fr every part.
That is a natural thinking, but newer engines are designed to cost less to be manufactured (and meet more stringent emission levels). Bean counters are always on the steering wheel, not engineers.
Not when the inadequacies are inherent to the design. Time marches on, we learn better ways of manufacturing, we get new technologies to put into the engines, we get better materials. The 7.3 was a fine engine for its time but so was the 300 straight six.
Has cummins had to redesign theirs over the years?
C'mon man, Cummins is Cummins . The venerable ISB has been receiving continuous improvements since launched in '98. But some engines were retired for the same reason (e.g.: L10, N14, ISM11, ...). By the way, they're launching a new HD engine, the X12, I've heard good things about it.GARY C wrote: ↑Sat Oct 14, 2017 8:29 pmHas Cummins had to redesign theirs over the years?
Its simply for wear. The duramax block is gray iron and the induction hardening prevents wear in that area.DaveMcLain wrote: ↑Wed Oct 11, 2017 4:31 pm Its tough to believe that's really necessary in a diesel application because I've seen a lot of those with a ton of miles and really very little cylinder wall wear. Assuming a regular cast iron block was used in the 5.9 Cummins, 7.3 Ford etc.
Unless it is all about the reduction of emissions. Maybe to allow a lighter ring package instead of the keystone type of top ring..