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Propeller For 88 HP Evinrude on a Montauk
kevin nolan	#1  Posted on 02/06/07 - 2:28 PM
Member Posts: 18 Comments: 0 Joined: 03/26/06	I have a 1990 88-hp Evinrude on my 1985 Montauk. With a 13-3/4" x 17" propeller on it I can’t get it above 4900 RPM. It should run at up to 5500 RPM at WOT I think. After doing some research I think I should use a 13-3/4" x 15" propeller. What do you guys think? Will this help get me more rpm? Thank you for any input. Kevin Wantagh whaler Edited by Tom W Clark on 02/08/07 - 7:24 PM
ratherwhalering	#2  Posted on 02/06/07 - 4:07 PM
Member Personal Page Posts: 20 Comments: 4 Joined: 03/21/05	Kevin, is your current propeller aluminum or stainless steel? What brand of propeller is it? Is the engine mounted too low on the transom? You can usually pick up 200-300 RPM and several MPH by raising the engine to the second or third set of holes from the top of the engine mounting bracket. The Stiletto 13.25 x 15 seems to be a good match for that engine.
rschneider	#3  Posted on 02/08/07 - 8:11 AM
Member Personal Page Posts: 26 Comments: 0 Joined: 07/17/06	What is the recommended length from bottom of V on the hull to bottom of skeg on the motor?
kevin nolan	#4  Posted on 02/08/07 - 3:24 PM
Member Posts: 18 Comments: 0 Joined: 03/26/06	Thanks. I'll check the Stiletto 13.25" x 15" and the recommended length from bottom of V on the hull to bottom of skeg on the motor. Do you know where to check? Thanks for the input. It all helps. I think I have a 13-3/4" x 15" I'll try first and I'll let you know when I put the boat in but that's not for a while due to 30 degree weather. Thanks again. Edited by Tom W Clark on 02/08/07 - 7:28 PM
Tom W Clark	#5  Posted on 02/08/07 - 7:33 PM
Member Personal Page Posts: 4280 Comments: 7 Joined: 09/30/05	Richard, Forget about the bottom of the skeg. The significant point of reference is the anti-ventilation plate (sometimes called the cavitation plate.) This should be about an inch above the keel with the propellers we use these days. On a Boston Whaler Montauk, this generally means the motor needs to be mounted "one hole up" with about 3/4" to 1" of space between the motor mounting bracket and the top of the transom.
kevin nolan	#6  Posted on 02/10/07 - 3:24 PM
Member Posts: 18 Comments: 0 Joined: 03/26/06	the boat is still under wraps but il cheek it whin i can thanks
kevin nolan	#7  Posted on 05/24/07 - 6:36 PM
Member Posts: 18 Comments: 0 Joined: 03/26/06	ok so it in the water with a 13 3/4x17 stainless steel prop i got an extra 200 rpms i am up to 5000 a bit over if i trim it out just right im going to try a 13 3/4 x 15 next i let you know
kevin nolan	#8  Posted on 06/10/07 - 11:38 AM
Member Posts: 18 Comments: 0 Joined: 03/26/06	well i put on the 13 3/4 x 15 it is not a ss but i like it alot it planes out much faster and i got 5500 rpm. if it was an ss and if i raised my engine up one notch i would get that 5800 wot but i am verry happy with the proformace as is. thank you all for your help a verry happy boater kevin