Subject: Interesting you should mention BMW GM-gearboxes. Author: bcweir as bcweir750 : member since January, 2006 : 8472 posts Posted on: 2009-07-12 21:10:32

Those are among the worst quality issues with regard to late-model BMW's.

Overhead valve technology has a few advantages: cheaper to make, generally easier to service, torque usually comes on sooner at lower rpm's.

However, these advantages are also against some notable shortcomings: more noise, more frictional losses from the valvetrain, as well as inefficiencies built into the block and head necessitated by having a lifter-based valve system. It's also more difficult to create multi-valve and direct injection fuel systems due to these disadvantages.

Engine technology is going forward, not backward, and this is but one example of GM's struggle to keep up with its competitors. Ford started phasing out its OHV V8's in the 1990's, ironically being the only American manufacturer to do so, and not so coincidentally, the only American automaker that wasn't dependent on a bailout for its survival.

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• OT: Anybody care to make any bets about the 'new' GM? - bcweir750 2009-07-11 19:08:10 (821 views)
  • Due to insurance regulations,lounge is a good spot for you BC - dr750 2009-07-21 12:53:31 (700 views)
    • Did that viagra work? - bcweir750 2009-07-26 00:44:54 (916 views)
      • U use Viagra as acne medicine dickhead? (nt) - dr750 2009-07-26 06:21:12 (967 views)
        • first you have to turn OFF the Fox News! That would be a start! - bcweir750 2009-07-26 16:37:36 (774 views)
          • That and you're not able to post on the regular forum without... - bcweir750 2009-07-27 11:50:16 (742 views)
  • Good God this thread is a waste of space - cvillebimmer 2009-07-18 14:44:36 (1589 views)
    • Re: Good God this thread is a waste of space - paulmer 2009-07-18 14:51:49 (723 views)
      • Agreed. (nt) - bcweir750 2009-07-19 00:44:22 (746 views)
  • no more GM motors now its Obama motor which coul be a good thing - alv12 2009-07-16 22:18:22 (851 views)
  • Ask the Man Who Drives One.. - geerhed 2009-07-15 09:21:19 (790 views)
    • I don't drive American cars, they fuel corporate greed. (nt) - bcschmeer 2009-07-15 11:37:18 (781 views)
      • j/k. (nt) - Rich 1990 750iL 2009-07-15 11:38:07 (795 views)
        • Snobbery? Nah. Just the facts. But here you go (pic) - bcweir750 2009-07-15 12:20:35 (813 views)
          • How's your 750 running, BC? (nt) - geerhed 2009-07-15 16:39:56 (783 views)
            • Thanks for your interest. To be continued..... (nt) - bcweir750 2009-07-16 01:55:47 (813 views)
              • Re: Thanks for your interest. To be continued..... (pic) - paulmer 2009-07-16 01:58:14 (799 views)
          • I love my wife's Chrysler Town & Country - Rich 1990 750iL 2009-07-15 16:02:31 (764 views)
          • Answer the question (nt) - htrdbmr 2009-07-15 12:54:04 (865 views)
  • Re: OT: Anybody care to make any bets about the 'new' GM? - paulmer 2009-07-11 20:22:40 (765 views)
    • Id' be interested in seeing that too. - bcweir750 2009-07-12 18:46:39 (789 views)
      • There's nothing wrong with big SUV's...and it isnt GM that's ... - 92735i 2009-07-13 11:26:10 (803 views)
        • Re: There's nothing wrong with big SUV's...and it isnt GM that's ... - paulmer 2009-07-13 21:54:33 (665 views)
          • Opinions are relative and you are entitled to yours...nothing wrong with it. (nt) - 92735i 2009-07-14 09:00:42 (767 views)
            • How about low resale value, poor reliability & reliability, and thirst for gas? - bcweir750 2009-07-14 11:38:46 (972 views)
              • low resale value, poor reliability & reliability, and thirst for gas - rv8flyboy 2009-07-15 15:43:32 (772 views)
              • Not sure what your point is..but to answer your question... - 92735i 2009-07-14 12:45:26 (703 views)
                • Well put - htrdbmr 2009-07-14 13:28:31 (755 views)
                  • Re: Well put - 92735i 2009-07-14 13:55:55 (863 views)
                    • Re: Well put - paulmer 2009-07-15 02:35:28 (746 views)
                      • Winter here is brutal...roads have craters vs potholes, and my... - 92735i 2009-07-15 15:28:07 (714 views)
                        • Re: Winter here is brutal...roads have craters vs potholes, and my... - paulmer 2009-07-16 02:05:52 (823 views)
                          • It's ok that you 'dont see the point'...millions do. BTW... - 92735i 2009-07-16 10:02:21 (750 views)
                            • Re: It's ok that you 'dont see the point'...millions do. BTW... - paulmer 2009-07-16 21:48:43 (682 views)
                    • Corn based ethanol puts out less energy than cane-based ethanol... - bcweir750 2009-07-15 02:05:40 (715 views)
                      • Dude! there is no such thing as 'priced more than its worth...' ... - 92735i 2009-07-15 15:31:23 (791 views)
                        • Would you pay $4 a gallon for gasoline that got you only half your gas mileage? - bcweir750 2009-07-16 11:44:17 (767 views)
                          • On scale from 1 to10,what's hottest chick u ever did in your car?,BC (nt) - dr750 2009-07-16 13:58:23 (717 views)
                            • Re: On scale from 1 to10,what's hottest chick u ever did in your car?,BC - paulmer 2009-07-17 13:26:40 (832 views)
                              • Not taking it back, Paulmer. I wasn't the first to strike below the belt - bcweir750 2009-07-18 14:19:43 (766 views)
                              • No it's not,he's undignified lil knowitall puke (nt) - dr750 2009-07-18 00:02:15 (794 views)
                            • N/A (nt) - htrdbmr 2009-07-16 14:36:57 (729 views)
                              • History has been made! - bcweir750 2009-07-17 03:42:44 (797 views)
                                • For the record:BC has never had a chick in his car (nt) - dr750 2009-07-17 10:21:23 (747 views)
                                  • of course he has, here she is in his car, in the beach outfit (pic) - rv8flyboy 2009-07-17 16:46:53 (881 views)
                                    • For one thing, that's not a 750. Nice pic though (nt) - bcweir750 2009-07-17 21:36:13 (802 views)
                                      • sorry, too busy looking at the foreground! your previous car maybe? ;-) (nt) - rv8flyboy 2009-07-17 22:57:49 (749 views)
                                        • What?!? There is a car in that picture? I can't see it., - Johan750 2009-08-05 11:42:41 (720 views)
                                        • Previous car was a 1981 BMW 320i. My interior wasn't nearly that nice (nt) - bcweir750 2009-07-17 23:34:09 (805 views)
                                • This is too easy (nt) - htrdbmr 2009-07-17 08:01:35 (715 views)
                                  • For the record, neither of you have any idea -- or a clue. (nt) - bcweir750 2009-07-17 16:12:05 (739 views)
                                    • This is the sort of high school restroom talk that makes the rest of us look bad - bcweir750 2009-07-17 16:15:20 (706 views)
                                      • What color is your manpurse? - dr750 2009-07-17 19:00:05 (746 views)
                                        • List of Republican sex scandals. Why htrdbmr and dr750 aren't getting any! (url) - bcweir750 2009-07-17 21:35:01 (756 views)
                    • You lucky dog! Wife and a girlfriend? How did you swing that? - cvillebimmer 2009-07-14 16:25:28 (822 views)
                      • There's plenty for eveybody! and I enjoy watching (nt) - 92735i 2009-07-14 17:27:25 (881 views)
      • Re: Id' be interested in seeing that too. - paulmer 2009-07-12 20:43:40 (784 views)
        • Interesting you should mention BMW GM-gearboxes. - bcweir750 2009-07-12 21:10:32 (777 views)
          • Re: Interesting you should mention BMW GM-gearboxes. - htrdbmr 2009-07-13 08:02:14 (769 views)
            • Yup, sure is! (nt) - 740gti 2009-07-15 00:11:39 (733 views)