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101 Posts
Discussion Starter #1
Main Jets        Torque      RPM         HP        RPM

 PTO     MAG
 340      310        82.5        7400      120.0      7800
 340      310        84.9        7400      121.2      7700
 340      310        83.0        7500      121.0      7900
 340      310        85.6        7500      123.6      7800
 300      270        83.9        7700      123.4      7800
 320      290        87.1        7400      125.6      7800
 310      290        87.5        7500      126.8      7800
 340      310        85.0        7200      120.8      7600
 320      290        87.5        7300      125.2      7800
 320      290        87.1        7400      124.6      7900
 310      290        87.0        7500      126.6      7700
 310      290        87.1        7300      127.2      7800

 Run 1  All stock cold pipe          Tests 1-7 with .6mm base
       2              hot pipe            gasket and 500 RV
       3  Short boots  cold pipe
       4  Short boots  hot pipe
       5  All stock
       6  All stock
       7  All stock
       8  501 RV  .3mm base gasket
       9  Same as above
      10 Half 91 octane pump gas- Half 114 race fuel
          .4 base gasket  500 RV
      11 Same as above  EGT  Mag  1140    PTO   1100
      12 Same as above

   All tests at 60 degree ambient  
   100 degree engine temp at start   125 - 135 at end
 

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I guess that explains why Bombardier is not building the 700 in '03! (At least I heard they are not putting it in the REV)
Where did you get these numbers?
 

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Those are some very impressive numbers.The old 670 ROTARY VALVE makes pretty good power. Was that on a land & sea dyno? I would have a hard time believing the 700 piston/reed would have stock numbers that good.
 

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Discussion Starter #8
Sorry I left out some details!!! 1999 670 HO on a Land and Sea Dyno. I did this testing to set up for stock class asphalt racing. All numbers are corrected. The engine had around 2000 miles on it at the time of the testing.
 

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Discussion Starter #11
The tests were with the stock air box and the DPM functional.I tried different base gaskets to see if a little increase in compression was worth lowering the port heights. When an engine has to pass tear down in the stock classes you have to try everything!!!!
 
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