Racing Ducati 250 Camshaft comparison data

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Racing Ducati 250 Camshaft comparison data Powered By Docstoc
					DUCATI CAM TIMING COMPARISON SPECS
18-Mar-09
                                                     Megacycle    #1 Motor #1 Motor #3 Motor #3 Motor #3 Motor #2 Motor #2 Motor #0 Motor
                                                      Specs        new for  1 tooth  new for  new for  new for Tractore Tractore Diana 4
                                                                  2008 as advanced    2009     2009     2009    Rosso    Rosso 1  Speed
                                                                    run in prep for           1 tooth  2 tooth             tooth
                                                                    2008     2009            advanced advanced          advanced
                                                                      A        B        D        E        F
                                                                    actual  actual    actual   actual   actual  actual    theory  actual

            Camshaft                                   564-00      564-00      564-00      564-00     564-00      564-00      564-00    564-00   unknown
            actual = checking clearance                0.040"      0.040"       0.040"     0.040"     0.040"      0.040"      0.040"    0.040"    0.040"
             - Inlet opens                    btdc       39          37           48         30         38          48          40        50        31
             - Inlet closes                   abdc       64          69           58         72         63          58          63        52        52
             - Exhaust opens                  bbdc       75          66           77         58         67          74          66        77        50
             - Exhaust closes                 atdc       47          51           40         61         52          42          54        44        42
            Duration - inlet                            283         286          286        282        281         286         283       282       263
            Duration - exhaust                          302         297          297        299        299         296         300       301       272
            Overlap                                      86          88           88         91         90          90          94        94        73
            Valve Lift - inlet (actual)                0.412"      0.409"       0.409"     0.406"     0.406"      0.406"      0.410"    0.410"    0.319"
            Valve Lift - exhaust (actual)              0.390"      0.383"       0.383"     0.385"     0.385"      0.385"      0.384"    0.384"    0.306"
            Valve Lift - inlet (cam on lathe)                                   0.423"
            Valve Lift - exhaust (cam on lathe)                                 0.397"
            TDC Lift Inlet (actual + 0.040")           0.186"       0.155"      0.202"                                        0.156"    0.156"   0.114"
            TDC Lift Exhaust (actual + 0.040")         0.181"       0.200"      0.164"                                        0.196"    0.196"   0.130"
            Lobe Centre Inlet                          102.5         106          95        111        102.5         95       101.5       91     100.5
            Lobe Centre Exhaust                         104          97.5       108.5       88.5       97.5         106         96      106.5      94
            Crossover                                                        5 deg btdc
            cam                                                      dots      1 tooth       dots      1 tooth   2 tooth        dots               dots
                                                                   aligned   clockwise     aligned   clockwise clockwise      aligned            aligned
                                                                               (to left)              (to left) (to left)

            crank                                                    dots      1 tooth       dots      1 tooth    2 tooth       dots               dots
                                                                   aligned   clockwise     aligned   clockwise clockwise      aligned            aligned
                                                                              (to right)              (to right) (to right)

            step                                                    none        none        none       none        none        none               none
            Dyno - bhp                                                          30.5                               28.1
            Dyno - tourque                                                      19.4                               18.0
            BASIC DATA
            Cam                              28      720 deg      25.71 deg per tooth
            Top bevel                        20      514.29 deg   25.71 deg per tooth
            Bottom bevel                     30      514.29 deg   17.14 deg per tooth
            Crank                            21      360 deg      17.14 deg per tooth

            Henry:                           Lobe Centre - EX must be longer than IN or symetrical
                                             Retard Cam for more bottom end power
                                             Advance Cam for more top end power
                                             Crossover - both valves off seats by same amount (during overlap; around 4-5 degrees from TDC)
                                                   if BTDC - more bottom end
                                                   if ATDC - more top end

            Joe Taylor:                      Exhaust target opening 85-95 bbdc (zero checking clearance)

				
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posted:12/28/2011
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