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Subject: "RE: Long rod engine.. aka RPM screamer.." Previous topic | Next topic
The1BillSep-09-03 12:26 PM
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#113624, "RE: Long rod engine.. aka RPM screamer.."
In response to In response to 44




          

From my favourite M3 crowd... http://www.e30m3performance.com/tech_articles/engine-tech/rod-ratio/kin2.htm

From page 2: "As the rod gets shorter, on the other hand, the max. piston acceleration is increased, but only at TDC. At BDC, the piston acceleration is actually reduced by a shorter rod (at least intially). The piston acceleration curve also begins to form a characteristic "double-hump" shape. If one were to keep making the rod shorter until it was only as long as the crank arm radius (a shorter rod than this would prevent the crank from completing a rotation), then the piston essentially would come to a "sudden" stop at 90° ATDC and it would "suddenly" start moving upwards again at 90° BTDC. These sudden stops and starts lead to infinite acceleration at 90° after and before TDC, and this is what the double-hump is starting to show."

>>But wait, there's more!<<

This man has forgotten more about engines then I think that I will ever know. Great guy, and a guru, if anyone can be called that.

http://www.iskycams.com/techtips.html

"In fact, this may surprise you, but I know of a gentleman who runs a 5.5" Rod in a 350 Small Block Chevy who makes more horsepower (we're talking top end here) than he would with a longer rod. Why? Because with a longer dwell time at BDC the short rod will actually allow you a slightly later intake closing point (about 1 or 2 degrees) in terms of crank angle, with the same piston rise in the cylinder. So in terms of the engines sensitivity to "reversion" with the shorter rod lengths you can run about 2-4 degrees more duration (1-2 degrees on both the opening & closing sides) without suffering this adverse affect! So much for the belief that longer rod's always enhance top end power!"

So Whitey isn't wrong. In fact, the "gospel" that he is "preaching" happens to be based on real theorums and observations. The math is real, and real good, at that. Pot, meet kettle.

-=B-=

Dude, Boeing called. They want their wing back.

Dark0ne95: There is a butthole on that girl that his going to feel the wrath of 23 yeras of worldwide hate.
Me: Can I put that in my sig?
Dark0ne95: GO right fucking ahead.

  

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Long rod engine.. aka RPM screamer.. [View all] , WheatKing, Jul-08-03 03:55 AM
  RE: Long rod engine.. aka RPM screamer.., Joshua97478, Jul-08-03 05:42 AM, #1
RE: Long rod engine.. aka RPM screamer.., WheatKing, Jul-08-03 06:24 AM, #2
      RE: Long rod engine.. aka RPM screamer.., theallpowerfulme, Jul-08-03 07:58 AM, #3
           RE: Long rod engine.. aka RPM screamer.., WheatKing, Jul-08-03 08:05 AM, #4
                RE: Long rod engine.. aka RPM screamer.., Blmet, Jul-09-03 07:35 AM, #5
                     RE: Long rod engine.. aka RPM screamer.., WheatKing, Jul-09-03 08:09 AM, #6
                     RE: Long rod engine.. aka RPM screamer.., Teamner947, Jul-11-03 09:48 AM, #7
                          RE: Long rod engine.. aka RPM screamer.., Blmet, Jul-11-03 10:42 PM, #8
                               RE: Long rod engine.. aka RPM screamer.., a_miller_76, Jul-12-03 05:27 AM, #9
                                    RE: Long rod engine.. aka RPM screamer.., Joshua97478, Jul-12-03 07:01 AM, #10
                                         RE: Long rod engine.. aka RPM screamer.., Joshua97478, Jul-16-03 09:08 AM, #11
                                              RE: Long rod engine.. aka RPM screamer.., wakeboard99, Jul-16-03 11:42 AM, #12
                                                   RE: Long rod engine.. aka RPM screamer.., Joshua97478, Jul-16-03 01:53 PM, #13
                                                        RE: Long rod engine.. aka RPM screamer.., MotoFool, Jul-27-03 11:03 AM, #14
                                                             RE: Long rod engine.. aka RPM screamer.., el2oCz, Jul-27-03 09:51 PM, #15
RE: Long rod engine.. aka RPM screamer.., WheatKing, Jul-28-03 03:59 AM, #16
RE: Long rod engine.. aka RPM screamer.., 96eclipse2nr, Jul-30-03 12:48 PM, #17
      RE: Long rod engine.. aka RPM screamer.., BuckNutty, Aug-06-03 05:51 PM, #18
      RE: Long rod engine.. aka RPM screamer.., Whittey, Aug-07-03 04:18 AM, #19
      RE: Long rod engine.. aka RPM screamer.., Teametx, Aug-21-03 05:33 AM, #20
           RE: Long rod engine.. aka RPM screamer.., theallpowerfulme, Aug-27-03 04:43 PM, #21
                RE: Long rod engine.. aka RPM screamer.., 2hot97GS, Aug-27-03 05:18 PM, #22
RE: Long rod engine.. aka RPM screamer.., TeamMetalJim, Aug-27-03 10:04 PM, #23
RE: Long rod engine.. aka RPM screamer.., MotoFool, Aug-29-03 01:33 AM, #24
RE: Long rod engine.. aka RPM screamer.., The1Bill, Sep-01-03 05:58 PM, #25
      RE: Long rod engine.. aka RPM screamer.., Matt_95tgs, Sep-01-03 07:52 PM, #26
           RE: Long rod engine.. aka RPM screamer.., The1Bill, Sep-01-03 08:39 PM, #27
                RE: Long rod engine.. aka RPM screamer.., The1Bill, Sep-01-03 09:59 PM, #28
                     RE: Long rod engine.. aka RPM screamer.., Whittey, Sep-02-03 04:43 AM, #29
                     RE: Long rod engine.. aka RPM screamer.., Teamner947, Sep-02-03 04:59 AM, #30
                     RE: Long rod engine.. aka RPM screamer.., Matt_95tgs, Sep-02-03 08:39 AM, #31
                     RE: Long rod engine.. aka RPM screamer.., The1Bill, Sep-02-03 11:35 AM, #32
                          RE: Long rod engine.. aka RPM screamer.., Whittey, Sep-02-03 02:22 PM, #33
                               RE: Long rod engine.. aka RPM screamer.., vtcomp, Sep-03-03 03:04 AM, #34
                                    RE: Long rod engine.. aka RPM screamer.., Whittey, Sep-03-03 05:29 AM, #36
                     RE: Long rod engine.. aka RPM screamer.., vtcomp, Sep-03-03 03:15 AM, #35
                          RE: Long rod engine.. aka RPM screamer.., vtcomp, Sep-04-03 02:49 AM, #37
                               RE: Long rod engine.. aka RPM screamer.., Whittey, Sep-04-03 03:09 AM, #38
                                    RE: Long rod engine.. aka RPM screamer.., tacoman123, Sep-07-03 04:21 PM, #39
                                         RE: Long rod engine.. aka RPM screamer.., The1Bill, Sep-07-03 05:33 PM, #40
                                              RE: Long rod engine.. aka RPM screamer.., Matt_95tgs, Sep-07-03 08:32 PM, #41
                                                   RE: Long rod engine.. aka RPM screamer.., Whittey, Sep-08-03 04:17 AM, #42
                                                        RE: Long rod engine.. aka RPM screamer.., Matt_95tgs, Sep-08-03 12:20 PM, #43
                                                             RE: Long rod engine.. aka RPM screamer.., Whittey, Sep-08-03 04:15 PM, #44
                                                                  RE: Long rod engine.. aka RPM screamer.., The1Bill, Sep-09-03 12:26 PM #45
                                                                       RE: Long rod engine.. aka RPM screamer.., Matt_95tgs, Sep-09-03 09:18 PM, #46
                                                                       RE: Long rod engine.. aka RPM screamer.., BuckNutty, Sep-10-03 01:56 AM, #47
                                                                       RE: Long rod engine.. aka RPM screamer.., Jay_98GSX, Sep-10-03 07:42 AM, #48
                                                                            RE: Long rod engine.. aka RPM screamer.., vtcomp, Sep-10-03 01:38 PM, #49
                                                                                 RE: Long rod engine.. aka RPM screamer.., turbo8u, Sep-10-03 03:06 PM, #50
                                                                                      RE: Long rod engine.. aka RPM screamer.., The1Bill, Sep-10-03 03:26 PM, #51
                                                                                           RE: Long rod engine.. aka RPM screamer.., The1Bill, Sep-10-03 04:40 PM, #52
                                                                                                RE: Long rod engine.. aka RPM screamer.., Matt_95tgs, Sep-10-03 06:18 PM, #53
                                                                                                     RE: Long rod engine.. aka RPM screamer.., Whittey, Sep-11-03 02:42 AM, #54
                                                                                                          RE: Long rod engine.. aka RPM screamer.., Matt_95tgs, Sep-11-03 06:08 AM, #55
                                                                                                               RE: Long rod engine.. aka RPM screamer.., Whittey, Sep-11-03 09:39 AM, #56
                                                                                                                    RE: Long rod engine.. aka RPM screamer.., The1Bill, Sep-11-03 10:39 AM, #57
                                                                                                                         RE: Long rod engine.. aka RPM screamer.., MotoFool, Sep-11-03 08:13 PM, #58
                                                                                                                         RE: Long rod engine.. aka RPM screamer.., Matt_95tgs, Sep-12-03 09:09 AM, #59
                                                                                                                              RE: Long rod engine.. aka RPM screamer.., Shockeclipse, Sep-19-03 10:50 PM, #60
                                                                                                                                   RE: Long rod engine.. aka RPM screamer.., 420AYE, Oct-03-03 06:39 AM, #61
                                                                                                                                        RE: Long rod engine.. aka RPM screamer.., python6586, Nov-28-03 12:36 PM, #62
                                                                                                                                             RE: Long rod engine.. aka RPM screamer.., Joshua97478, Dec-01-03 11:31 AM, #63
                                                                                                                                             RE: Long rod engine.. aka RPM screamer.., python6586, Dec-01-03 12:06 PM, #64
                                                                                                                                             RE: Long rod engine.. aka RPM screamer.., ModeratorCorbin, Dec-02-03 05:38 AM, #65

Top 2GNT Technical Performance/Engine topic #113579 Previous topic | Next topic
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