On Fri, 2013-04-05 at 23:42 -0500, Dave wrote: > I think we are sort of going off into the weeds, but a little anti-seize > goes a long way. Weeds? I don't see any weeds. ;-)
I would like to thank everyone for their helpful replies. Clearly others are better at google or other search engines than I am. BTW- google used to take regular expressions and I assume it still does. Haven't tried for years. ;-) Dave > > And sometimes you have to go to extremes to get a spark plug into the > proper place in the cylinder. > > Remember the old Chrysler 426 Hemi? Those plugs were inside the valve > covers and only kept dry via tube seals. > > Not many complained about the plug locations after getting 425 derated > hp on pump gas. :-) > > Dave > > > > On 4/5/2013 5:19 PM, jeremy youngs wrote: > > ok , ok as a ford tech i will way in , 2 designs sucked the third was a bit > > better, but they put these in a 7 in deep hole and gave terrible access . > > the largest concerns are lack of routine maintenance ( the manual > > recommends replacement at 70k) > > and the resulting galvanic action. these arte a pain to fix in situ , but > > the c oncern has far more to do with performing maintenance when hot and > > overdue than the depth of the threads. I have serviced hundreds of these > > and i have NOT lost one yet (knock on wood) I always allow to cool fully , > > and saturate with pb blaster before removal and use judicious force to > > remove. do I agree the design is lacking , yes i do . do i think it is a > > result of not enough thread no I dont . I believe that maintenance > > practices and techniques are key here. All of that said the third style > > with more threads and longer plug stem are more tolerant of abuse but are > > more likely to stick from lack of maintenance due to galvanic action. in > > short dont bury a plug 7 inches deep in the center of an aluminum cylinder > > head > > > > > > On Fri, Apr 5, 2013 at 6:06 PM, Kent A. Reed<kentallanr...@gmail.com>wrote: > > > > > >> On 4/5/2013 5:46 PM, Gregg Eshelman wrote: > >> > >>> --- On Fri, 4/5/13, Viesturs Lācis<viesturs.la...@gmail.com> wrote: > >>> > >>> > >>>> 2013/4/5 dave<dengv...@charter.net> > >>>> > >>>> > >>>>> Hi all, > >>>>> > >>>>> The wiki for buttress threads states the buttress > >>>>> > >>>> threads tend to fail > >>>> > >>>>> because only the first 4 threads are load bearing. > >>>>> > >>>>> > >>>> Not really true, all threads are bearing the load, it is > >>>> just that due to > >>>> elasticity of material first one has the most, last one has > >>>> the least load. > >>>> I have formulas to calculate, what percentage of the load > >>>> does each thread > >>>> take somewhere in my notes from last year. Basically the > >>>> rule of thumb is > >>>> that first three threads take approximately 75% of the load > >>>> and it does not > >>>> make much sense to have more than 8-10 threads. > >>>> > >>> That must be what the Ford engineers thought when they made all those > >>> > >> overhead cam V8 engines with only 4 threads in the spark plug holes. Theory > >> met reality and failed. The threads fail and the spark plugs blow out. > >> > >>> > >> Weeeellll, let's not forget the confounding effect of > >> over-/under-tightened sparkplugs. In almost every one of the 5 cars I've > >> owned, the mechanics have had a bigger impact than the engineers. > >> Reality can bite in so many ways. > >> > >> Regards, > >> Kent > >> > >> > >> > >> ------------------------------------------------------------------------------ > >> Minimize network downtime and maximize team effectiveness. > >> Reduce network management and security costs.Learn how to hire > >> the most talented Cisco Certified professionals. Visit the > >> Employer Resources Portal > >> http://www.cisco.com/web/learning/employer_resources/index.html > >> _______________________________________________ > >> Emc-users mailing list > >> Emc-users@lists.sourceforge.net > >> https://lists.sourceforge.net/lists/listinfo/emc-users > >> > >> > > > > > > > > > ------------------------------------------------------------------------------ > Minimize network downtime and maximize team effectiveness. > Reduce network management and security costs.Learn how to hire > the most talented Cisco Certified professionals. Visit the > Employer Resources Portal > http://www.cisco.com/web/learning/employer_resources/index.html > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Minimize network downtime and maximize team effectiveness. Reduce network management and security costs.Learn how to hire the most talented Cisco Certified professionals. Visit the Employer Resources Portal http://www.cisco.com/web/learning/employer_resources/index.html _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
