2012 excel stalker center console 18' it has a 80'' beam and weight 825 lbs.
The motor is a 2012 E-tec 90hp it weights 320 lbs and the ratio 2:0:1
total weight of the rig is 1245lbs with gas filled up .
As of now I have a 6" jackplate (manual) I adjusted the center on the prop shaft to the bottom of the pad 3 1/2" as of now IM running a 13 7/8 X 19 pitch Viper S.S. prop and WOT IM turning 5950 RPM . At 46.5 MPH gps . Should I goto a 21 pitch s.s. Prop to cut my RPM close to 5500 RPM? Or a 19 pitch with more cup? Help me please rayingevinrude says 5200-5500 rpm max)
05-23-2012 10:56 - edited 05-23-2012 10:58
It is not often that a 90hp can turn a 21" prop at the recommended rpm.
Before you do any more prop swapping, have the dealer tech hook up his laptop and check the accuracy of your tachometer while you are driving. First look on the back of the tach for a selector switch to make sure it is pointed to 6 pole setting and not to 5 pole setting. Is it an Evinrude (BRP) factory tach or some other brand?
The tach has to be known to be accurate before trying out a propeller.
Since you have a jack-plate, it is a good idea to have a water pressure gauge and to monitor it at various settings.
You can try a 21" prop to get the revs down to the recommended 5200-5500 range with a normal load aboard. What did the tech say after running the boat with you?
he seemed very impressed on the rig they sell the motors not the hull. he said im running 350 rpms to high and a 20 or a 21 with a cup would bring them down give me some bow lift and he said to raise the motor another inch on the jack plate..
so what do you personally think? he was kinda young but it sounded good..
05-30-2012 04:37 - edited 05-30-2012 04:42
His suggestions sound OK to try. Be sure to have a water pressure gauge installed and monitor it often since you are raising the motor and do not want to lose water pressure.
You may want to try the Rogue series of propellers from Evinrude, unless you are looking only for top speed and not all around acceleration and mid-range performance..
Rogue Prop Sizes 13,15,17,19 and 21" pitch.This is a stainless steel 4 blade that provides faster acceleration and top speeds in stern heavy boats. Flats boat operators will appreciate this propellers ability to lift the transon and accelerate cleaner in shallow water.
Let us know what numbers you get after trying a different prop and raising the motor. Good luck.
Can anyone simplify this?
I have a 2011 E-tec 90. Dealer put a 13.5X15 prop on the rig. The rig (17' Thompson lapstrake, wood) weight is about 850 lbs plus E-tec. I am running 5,000 rpm & 39-40 mph WOT. Dealer says rpms are OK. Speed is more than fast enough for the boat.
Tried a 14 X 13 prop and got 5,500 rpm & 33 mph which is not quite fast enough.
Dealer say's go back to the old prop. Sound OK or is there another option?
What make and model propellers are you talking about?
I can only recommend that you stick with Evinrude props.