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Author Topic:   16-footer with E-TEC 90

bloller posted 12-21-2013 05:36 PM ET (US)
Just re-powered [a 16-foot Boston Whaler boat hull, later described as a 1970 pre-smirk 16-footer, with an Evinrude E-TEC 90-HP outboard engine. The dealer installed a 15-pitch aluminum BRP propeller. The 90-HP E-TEC is mounted one-hole-up. To go any higher, I would have had to drill new lower holes. The [anti-ventilation] plate is about one-inch above the bottom of the hull. [A top speed of] 39-MPH [occurs at an engine speed of] 5,300 [RPM] [with the boat being] lightly loaded. I am not sure if I should go with 13-pitch or 15-pitch Stiletto, or 15-pitch or 17-pitch Viper. The aluminum propeller looks to have a quite aggressive cup.
There is also the Mercury Silverado which can be used on the E-TEC and is available in a 16- pitch.
crabby posted 12-23-2013 09:46 PM ET (US)
15 inch pitch Stiletto.
Lupi posted 12-24-2013 06:17 AM ET (US)
What is your boat, exactly ?
bloller posted 12-24-2013 09:19 AM ET (US)
Boat is a 1970 pre-smirk 16-foot 7-inch. I will run [the 90-HP E-TEC] some more to see if [the 90-HP E-TEC] will "loosen up" some before deciding on propeller. I cannot find any reports of anyone running 15-pitch props with this setup. The 15-pitch Stiletto really a 17-pitch.
Chuck Tribolet posted 12-25-2013 04:11 AM ET (US)
What's the recommended RPM range for you E-TEC 90?
Chuck
bloller posted 12-25-2013 10:53 AM ET (US)
I was able to reach 5,400 to 5,500-RPM, yesterday, trimmed out. If I get the 15-pitch Stiletto or 17-pitch Viper I should be on the low end of the recommended 5,000 to 5,200 optimum RPM range. I'll just use the 15-pitch aluminum when more heavily loaded.
bloller posted 01-05-2014 12:04 PM ET (US)
I'm getting a new-old-stock OMC SST 13-7/8 x 17 propeller for under $200. Same propeller as the current BRP Viper. I will post results, and, if too much pitch, will probably get a Powertech OSN3 in 16-pitch. It is a copy of the SST and Viper
ratherwhalering posted 01-06-2014 05:16 PM ET (US)
The OMC SST 13-7/8 x 17 prop is more appropriate for your engine height. If you were two holes up, I would recommend the 15 Stiletto. In my experience with this engine and hull combonation, the SST/Viper outperforms the Stiletto at lower engine mounting positions (0-1) and conversely the Stiletto outperforms the SST/Viper at higher engine mounting positions (2-3).
bloller posted 01-15-2014 05:45 PM ET (US)
Ran the SST prop today and was only able to gain 1mph at WOT with max rpm at 5050rpm. It did perform better at cruising speed though. To reach the 42-43mph others are reporting I would probably have to raise engine more and remove old bottom paint. I'm gonna wait till warmer weather to see what happens with performance before making any more changes
Tom W Clark posted 01-15-2014 07:01 PM ET (US)
40 MPH is pretty good for a motor only one hole up on a hull with old bottom paint.
Do not underestimate what a dramatic difference a fair bottom and higher motor mounting height can make.
crbenny posted 01-15-2014 11:06 PM ET (US)
For another point of reference I can share my experience with the pre-smirk hull and the E-tec 90.
Some may feel that the original 16'7" hull is faster than the smirked hull due to weight savings and bottom contour. For this reason, I went with the Stiletto Advantage I 17" and so far it seems to be a good fit. My engine only has 15 hours on it so I'm hoping it will improve but what I've seen so far is this;
1968 Nauset with a 90 E-tec mounted 2 holes up, no bottom paint and no water intrusion. 1 small mushroom anchor, a few lines, bimini top folded up, 2 guys 180 lbs each, 2 6-gallon gas tanks almost full, and 1 half-empty beer cooler. (The other half had been divided equally in order to maintain proper trim, comsumed by the 2 guys, processed and then jettisoned over the side in a hi velocity/low pressure de-ballasting operation).
The boat shoots to 40 mph instantly and then creeps up from there. I saw 42.4 mph on my Garmin 541s at roughly 5100 RPMs. I also noticed that the a/v plate is buried below the surface even when trimmed up at planing speeds. It's been said many times, and I would concur that 2 holes up is as low as an engine should ever be mounted with a modern prop.
I would surmise that if I moved the engine up to the highest position, lashed the anchor to my buddy and threw him over the side, and quit drinking, I could hit 45 mph with relative ease.
Chris

ratherwhalering posted 01-24-2014 01:37 PM ET (US)

quote:
I would surmise that if I moved the engine up to the highest position, lashed the anchor to my buddy and threw him over the side, and quit drinking, I could hit 45 mph with relative ease.
Whoa, hang on there, don't you think quitting drinking is a little extreme?
crbenny posted 01-24-2014 01:56 PM ET (US)
And, as it turns out, unnecessary. I took it out alone 3 days ago, and with me alone and one 6 gal. fuel tank half full, I hit 45.1 MPH at 5300 RPM.
I'll probably move it up to the highest position and remove the bimini. Should break 46 MPH. I think a six pack in a small cooler will likely make the manifest for that trip and I'll surmise that the negative impact on max velocity will be insignificant.
Chris
ratherwhalering posted 01-24-2014 03:48 PM ET (US)
That sounds about right. 1987 Montauk, 2004 E-TEC, and I hit 5500 max RPM with a light load, Stiletto 13.25 x 15, 42.5 MPH. I have 4-inch CMC set back brackets, AV plate 3-inches above LKP.
I've yet to have a full six pack of beer in my cooler.
crbenny posted 01-24-2014 05:07 PM ET (US)
Rob, weren't you running a 17" Stiletto at one point? You obviously prefer the 15"?
I'm still wondering if I shouldn't at least try the 15".
Chris
Tom W Clark posted 01-24-2014 07:48 PM ET (US)
Chris -- If you drop to a 15" Advantage, your WOT engine speed to shoot to 6000 RPM.
Though the WOT range of the E-Tec 90 is 4500-5500 RPM, the Optimal WOT range is 5000-5200 RPM
A 1968 Nauset is probably 250 pounds lighter than a 1986 Montauk like Rob's boat. Rob also has a stern seat, cooler seat and a 24 gallon fuel tank.
Added weight kills speed.
The flawless smooth gel coat of your boat is also helping your speed. Most old Whaler are no where near as pristine as yours.
crbenny posted 01-31-2014 10:10 PM ET (US)
Tom, I agree with every point you've made. Light weight is important on a small boat and when I ran 200 lbs lighter than normal, I picked up 2.5 MPH. I'm sure my boat may be lighter than most as mine seems to be the only E-tec powered 16'7" I've seen where the sides of the boat are dry at rest.
Based on the performance numbers I've seen thus far, I feel the Stiletto Advantage 17" will be my primary prop. The only area where I may question that choice is watersports. If I have at least 2 people in the boat, cooler, gear, etc. can get a large slalom skier out of the water with this prop and if so I'll probably be running full throttle in the hi 30 MPH range at below 5000 RPMs. It seems there's a large RPM spread between the 15" and 17" Stiletto and because of that, there may not be a "one size fits all" prop for this boat. This means either the Stiletto 15" or the Viper/SST II 17" for watersports. What are your thoughts?
Chris
Tom W Clark posted 02-01-2014 10:25 AM ET (US)
If the 17" Advantage does everything you need it to do, so be it; you don't need another prop. The proof of the pudding is in the tasting.
Most 16'-7" classic Whalers with an E-Tec 90 are going to make best use of a 15" Advantage because those boats weigh more that yours and do not have as perfect a bottom as yours.
bloller posted 03-21-2014 09:52 AM ET (US)
Got the 16 pitch quicksilver prop I mentioned earlier and it is perfect. 41.9mph trimmed way out at 5300rpm

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Author	Topic: 16-footer with E-TEC 90
bloller	posted 12-21-2013 05:36 PM ET (US) Just re-powered [a 16-foot Boston Whaler boat hull, later described as a 1970 pre-smirk 16-footer, with an Evinrude E-TEC 90-HP outboard engine. The dealer installed a 15-pitch aluminum BRP propeller. The 90-HP E-TEC is mounted one-hole-up. To go any higher, I would have had to drill new lower holes. The [anti-ventilation] plate is about one-inch above the bottom of the hull. [A top speed of] 39-MPH [occurs at an engine speed of] 5,300 [RPM] [with the boat being] lightly loaded. I am not sure if I should go with 13-pitch or 15-pitch Stiletto, or 15-pitch or 17-pitch Viper. The aluminum propeller looks to have a quite aggressive cup. There is also the Mercury Silverado which can be used on the E-TEC and is available in a 16- pitch.
crabby	posted 12-23-2013 09:46 PM ET (US) 15 inch pitch Stiletto.
Lupi	posted 12-24-2013 06:17 AM ET (US) What is your boat, exactly ?
bloller	posted 12-24-2013 09:19 AM ET (US) Boat is a 1970 pre-smirk 16-foot 7-inch. I will run [the 90-HP E-TEC] some more to see if [the 90-HP E-TEC] will "loosen up" some before deciding on propeller. I cannot find any reports of anyone running 15-pitch props with this setup. The 15-pitch Stiletto really a 17-pitch.
Chuck Tribolet	posted 12-25-2013 04:11 AM ET (US) What's the recommended RPM range for you E-TEC 90? Chuck
bloller	posted 12-25-2013 10:53 AM ET (US) I was able to reach 5,400 to 5,500-RPM, yesterday, trimmed out. If I get the 15-pitch Stiletto or 17-pitch Viper I should be on the low end of the recommended 5,000 to 5,200 optimum RPM range. I'll just use the 15-pitch aluminum when more heavily loaded.
bloller	posted 01-05-2014 12:04 PM ET (US) I'm getting a new-old-stock OMC SST 13-7/8 x 17 propeller for under $200. Same propeller as the current BRP Viper. I will post results, and, if too much pitch, will probably get a Powertech OSN3 in 16-pitch. It is a copy of the SST and Viper
ratherwhalering	posted 01-06-2014 05:16 PM ET (US) The OMC SST 13-7/8 x 17 prop is more appropriate for your engine height. If you were two holes up, I would recommend the 15 Stiletto. In my experience with this engine and hull combonation, the SST/Viper outperforms the Stiletto at lower engine mounting positions (0-1) and conversely the Stiletto outperforms the SST/Viper at higher engine mounting positions (2-3).
bloller	posted 01-15-2014 05:45 PM ET (US) Ran the SST prop today and was only able to gain 1mph at WOT with max rpm at 5050rpm. It did perform better at cruising speed though. To reach the 42-43mph others are reporting I would probably have to raise engine more and remove old bottom paint. I'm gonna wait till warmer weather to see what happens with performance before making any more changes
Tom W Clark	posted 01-15-2014 07:01 PM ET (US) 40 MPH is pretty good for a motor only one hole up on a hull with old bottom paint. Do not underestimate what a dramatic difference a fair bottom and higher motor mounting height can make.
crbenny	posted 01-15-2014 11:06 PM ET (US) For another point of reference I can share my experience with the pre-smirk hull and the E-tec 90. Some may feel that the original 16'7" hull is faster than the smirked hull due to weight savings and bottom contour. For this reason, I went with the Stiletto Advantage I 17" and so far it seems to be a good fit. My engine only has 15 hours on it so I'm hoping it will improve but what I've seen so far is this; 1968 Nauset with a 90 E-tec mounted 2 holes up, no bottom paint and no water intrusion. 1 small mushroom anchor, a few lines, bimini top folded up, 2 guys 180 lbs each, 2 6-gallon gas tanks almost full, and 1 half-empty beer cooler. (The other half had been divided equally in order to maintain proper trim, comsumed by the 2 guys, processed and then jettisoned over the side in a hi velocity/low pressure de-ballasting operation). The boat shoots to 40 mph instantly and then creeps up from there. I saw 42.4 mph on my Garmin 541s at roughly 5100 RPMs. I also noticed that the a/v plate is buried below the surface even when trimmed up at planing speeds. It's been said many times, and I would concur that 2 holes up is as low as an engine should ever be mounted with a modern prop. I would surmise that if I moved the engine up to the highest position, lashed the anchor to my buddy and threw him over the side, and quit drinking, I could hit 45 mph with relative ease. Chris
ratherwhalering	posted 01-24-2014 01:37 PM ET (US) quote: I would surmise that if I moved the engine up to the highest position, lashed the anchor to my buddy and threw him over the side, and quit drinking, I could hit 45 mph with relative ease. Whoa, hang on there, don't you think quitting drinking is a little extreme?
crbenny	posted 01-24-2014 01:56 PM ET (US) And, as it turns out, unnecessary. I took it out alone 3 days ago, and with me alone and one 6 gal. fuel tank half full, I hit 45.1 MPH at 5300 RPM. I'll probably move it up to the highest position and remove the bimini. Should break 46 MPH. I think a six pack in a small cooler will likely make the manifest for that trip and I'll surmise that the negative impact on max velocity will be insignificant. Chris
ratherwhalering	posted 01-24-2014 03:48 PM ET (US) That sounds about right. 1987 Montauk, 2004 E-TEC, and I hit 5500 max RPM with a light load, Stiletto 13.25 x 15, 42.5 MPH. I have 4-inch CMC set back brackets, AV plate 3-inches above LKP. I've yet to have a full six pack of beer in my cooler.
crbenny	posted 01-24-2014 05:07 PM ET (US) Rob, weren't you running a 17" Stiletto at one point? You obviously prefer the 15"? I'm still wondering if I shouldn't at least try the 15". Chris
Tom W Clark	posted 01-24-2014 07:48 PM ET (US) Chris -- If you drop to a 15" Advantage, your WOT engine speed to shoot to 6000 RPM. Though the WOT range of the E-Tec 90 is 4500-5500 RPM, the Optimal WOT range is 5000-5200 RPM A 1968 Nauset is probably 250 pounds lighter than a 1986 Montauk like Rob's boat. Rob also has a stern seat, cooler seat and a 24 gallon fuel tank. Added weight kills speed. The flawless smooth gel coat of your boat is also helping your speed. Most old Whaler are no where near as pristine as yours.
crbenny	posted 01-31-2014 10:10 PM ET (US) Tom, I agree with every point you've made. Light weight is important on a small boat and when I ran 200 lbs lighter than normal, I picked up 2.5 MPH. I'm sure my boat may be lighter than most as mine seems to be the only E-tec powered 16'7" I've seen where the sides of the boat are dry at rest. Based on the performance numbers I've seen thus far, I feel the Stiletto Advantage 17" will be my primary prop. The only area where I may question that choice is watersports. If I have at least 2 people in the boat, cooler, gear, etc. can get a large slalom skier out of the water with this prop and if so I'll probably be running full throttle in the hi 30 MPH range at below 5000 RPMs. It seems there's a large RPM spread between the 15" and 17" Stiletto and because of that, there may not be a "one size fits all" prop for this boat. This means either the Stiletto 15" or the Viper/SST II 17" for watersports. What are your thoughts? Chris
Tom W Clark	posted 02-01-2014 10:25 AM ET (US) If the 17" Advantage does everything you need it to do, so be it; you don't need another prop. The proof of the pudding is in the tasting. Most 16'-7" classic Whalers with an E-Tec 90 are going to make best use of a 15" Advantage because those boats weigh more that yours and do not have as perfect a bottom as yours.
bloller	posted 03-21-2014 09:52 AM ET (US) Got the 16 pitch quicksilver prop I mentioned earlier and it is perfect. 41.9mph trimmed way out at 5300rpm