06-19-2016, 09:42 PM
Where would I find what RPM my 715hp Cummins should be turning at WOT; and what speed over the ground should my boat achieve (subject to sea conditions, hull cleaning, etc.)?
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06-20-2016, 05:08 AM
Contact Tiara customer service they most likely have the performance data for your boat.... Other option is to look up your engines on the Cummins Web site.... Best bet is Tiara as the performance data includes speed at various engine RPM including fuel burn rate (GPH)........
(06-20-2016, 05:08 AM)ReelMagic Wrote: Contact Tiara customer service they most likely have the performance data for your boat.... Other option is to look up your engines on the Cummins Web site.... Best bet is Tiara as the performance data includes speed at various engine RPM including fuel burn rate (GPH)........
I sho have thought of that! Thanks for jogging my forgetful memory.
06-20-2016, 09:33 PM
It should be listed on the serial number plate as 715 HP @ xxxxRPM you should be able to get about 50 to 100 RMP above rated RPM. I would also suggest joining boatdiesel.com you will find many answers to your questions there.
06-20-2016, 09:45 PM
(06-20-2016, 09:33 PM)Crown Royal Wrote: It should be listed on the serial number plate as 715 HP @ xxxxRPM you should be able to get about 50 to 100 RMP above rated RPM. I would also suggest joining boatdiesel.com you will find many answers to your questions there.
I'll check the plate; Brian Kane at Tiara was kind enough to send me performance specs for a lightly loaded new hull from tests made in 2007.
06-21-2016, 06:24 AM
Make sure the engines are NOT OVER PROPed. Cummins QSM11's have an exhaust manifold warping / cracking problem if they run hot from being overloaded. I'm talking about a $25,000 repair. Boatdiesel.com has some info on this and YES join up for $25.00.
Capt. George
Capt. George
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