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Author Topic:   16-footer with E-TEC 90

Tom Hemphill posted 03-31-2014 04:47 PM ET (US)
My mechanic confirmed what I suspected, that my propeller has a spun hub. I have a 1970 16 foot Whaler powered by a 2006 90-HP Evinrude E-TEC, with an aluminum propeller stamped "14 x 19." My wide open throttle performance is about 38 MPH at 4900 RPM, and I find the "hole shot" acceptable. Yes, the motor is mounted all the way down. What should I do?
bloller posted 03-31-2014 06:36 PM ET (US)
You need a 17 pitch and you should be faster than 38mph unless heavily loaded
crbenny posted 03-31-2014 08:59 PM ET (US)
Tom, you need to be mounted 2 holes up if you're going to stick with a low tech prop such as what you have. You need to be all the way up if you're going to purchase a Stiletto or a Viper, which seem to be the top two choices for your boat. I've run both on the same exact set up and they both perform well, but you've GOT to get that motor raised at least 2 holes from where you are currently.
Chris
Teak Oil posted 04-01-2014 08:41 PM ET (US)
If the motor is mounted in the "blind holes" (bottom bolts lag screwed into the transom, don't know if the E-tec had this option) it will be difficult to raise the motor. The best solution would be to use a small jack plate, like a 4" model.
Your performance is terrible, you should be running 5 mph faster. Worse, you are lugging your motor by not allowing it to reach the recommended rpm range that the manufacturer has specified.
Sell that prop on eBay, it is not close to the right one for your hull. There are a billion threads here about propping a 16' hull with a 90 E-tec, so start reading.
Basically you will need a 15" Stiletto or a 17" of another brand to get into the right rpm range.
Tom Hemphill posted 04-04-2014 05:45 PM ET (US)
Thank you all. My motor uses the "blind" lower bolt attachments, but I am willing and able to fill and re-drill the holes in the transom. I don't think a jack plate is warranted. For a replacement propeller, I am considering a BRP aluminum 17" pitch prop, or the frequently-suggested 13-1/4" x 15" Stiletto Advantage I prop. I am favoring the latter, which will cost about $100 more, but will probably perform better and prove cheaper in the long run.
Teak Oil posted 04-04-2014 10:26 PM ET (US)
A 4" fixed jack plate would allow you to raise the motor and save a hassle of redrilling and filling, and still be pretty low in cost.
I think you are on the right path with that Stiletto prop, Tom Clark can find the best deal on one for you.
Raising the engine will give significant gains in mileage and speed, I think you will be happy with the results

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Author	Topic: 16-footer with E-TEC 90
Tom Hemphill	posted 03-31-2014 04:47 PM ET (US) My mechanic confirmed what I suspected, that my propeller has a spun hub. I have a 1970 16 foot Whaler powered by a 2006 90-HP Evinrude E-TEC, with an aluminum propeller stamped "14 x 19." My wide open throttle performance is about 38 MPH at 4900 RPM, and I find the "hole shot" acceptable. Yes, the motor is mounted all the way down. What should I do?
bloller	posted 03-31-2014 06:36 PM ET (US) You need a 17 pitch and you should be faster than 38mph unless heavily loaded
crbenny	posted 03-31-2014 08:59 PM ET (US) Tom, you need to be mounted 2 holes up if you're going to stick with a low tech prop such as what you have. You need to be all the way up if you're going to purchase a Stiletto or a Viper, which seem to be the top two choices for your boat. I've run both on the same exact set up and they both perform well, but you've GOT to get that motor raised at least 2 holes from where you are currently. Chris
Teak Oil	posted 04-01-2014 08:41 PM ET (US) If the motor is mounted in the "blind holes" (bottom bolts lag screwed into the transom, don't know if the E-tec had this option) it will be difficult to raise the motor. The best solution would be to use a small jack plate, like a 4" model. Your performance is terrible, you should be running 5 mph faster. Worse, you are lugging your motor by not allowing it to reach the recommended rpm range that the manufacturer has specified. Sell that prop on eBay, it is not close to the right one for your hull. There are a billion threads here about propping a 16' hull with a 90 E-tec, so start reading. Basically you will need a 15" Stiletto or a 17" of another brand to get into the right rpm range.
Tom Hemphill	posted 04-04-2014 05:45 PM ET (US) Thank you all. My motor uses the "blind" lower bolt attachments, but I am willing and able to fill and re-drill the holes in the transom. I don't think a jack plate is warranted. For a replacement propeller, I am considering a BRP aluminum 17" pitch prop, or the frequently-suggested 13-1/4" x 15" Stiletto Advantage I prop. I am favoring the latter, which will cost about $100 more, but will probably perform better and prove cheaper in the long run.
Teak Oil	posted 04-04-2014 10:26 PM ET (US) A 4" fixed jack plate would allow you to raise the motor and save a hassle of redrilling and filling, and still be pretty low in cost. I think you are on the right path with that Stiletto prop, Tom Clark can find the best deal on one for you. Raising the engine will give significant gains in mileage and speed, I think you will be happy with the results