Motor Operation RPMS Motor Operation RPMS
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    Motor Operation RPMS
from robbocop #14013 #14013  
6/13/2012 12:24:07 PM

Rated:

 Just finished the break in period on the 2012 Merc 60hp EFI. (2012 Tracker 175TXW) When trying to find my sweet spot, I had the boat ful out going at 5100 RPMS, when applying the tilt to find the sweet spot, rpms jumped to 6200 and the boat speed increased about 5-7mph. The book says full throttle speed is 5500 - 6000 rpms, is this an average or am I pushing the boat too much with the extra 200 rpms? I did not run it full out/tilt for any length of time a couple of minutes then would back off a bit.


Thanks


Rob


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   havent owned a motor that size for a very long time but... from RobShaw  6/13/2012 3:03:41 PM
  You might want to go up in pitch on the prop. If youre getting that many rpms in the summer, then you will have even more rpms in the cooler months. As a general rule, you dont want to exceed max rpms (in your case 6k) at WOT. And in many cases, youre performance gains will be negligible at >6k rpms. But on the other hand, depending on the load you were carrying or will carry on average, you're not that far off.

Edited 6/13/2012 3:11:27 PM


   check your mph from Beartrap   6/13/2012 6:28:05 PM
 use your gps to check your mph......suspect that your highest speed will be 5800 to 6000 rpms and the motor is just trimmed too high at 6200 rpms.....if your hole shot is good,I wouldn't change anything.......and i wouldn't run it for any extended period at 6200 rpms....

Beartrap
   BearTrap Nailed it from fishintechnician #13154 #13154  6/14/2012 11:27:11 AM
 Beartrap nailed it... If you highest speed does turn out to be at 6200 rpms you will have to go up one inch in pitch say a 13 to a 14


   Rpm from fishsmart #10374 #10374  6/14/2012 11:31:21 AM
 Talk with Mercury. There is likely a rev limiter built into the control system that will limit at 6200 or so RPM.


If you still have throttle left you can turn a lower pitch prop but not much lower.


If you have a rev limiter I would leave things as they are and run at 6000 rpm.


Charles


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