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Author Topic:   SPORT 15, 50-HP Nissan TLDI

mikejoyce77 posted 03-31-2008 12:31 AM ET (US)
Sunday was a nice day so I took my 1981 Boston Whaler SPORT 15 out for the first time after its restoration. I have a 2008 Nissan 50-HP TLDI engine. I have a 11.1-inch diameter and 13-inch pitch prop on the boat. I am following the break-in period schedule. I have to run the first three hours at 3,500-RPM with full throttle only one minute. I had three people onboard weight 460-lbs, six gallons of fuel, and battery. I found that I could just start to [reach plane] at 3,500-RPM. It almost seemed that there was a little bit too much drag in the back of the boat. Speed was 28-KPH. At 3,800-RPM planing was a little better. Speed 32-KPH. At 4,000-RPM planning was really good. Speed 36-KPH. At full throttle 5,800-RPM speed was 58-KPH
now I'm fairly new to this. Is 4,000-RPM to cruise at too hard on the engine? I'm going to talk to my dealer tomorrow. What do you guys think?
This engine is extremely quiet, and wow, out for two hours, I barely used any gas. Can't belive how fuel efficient this is. and with oil too.
Sorry speed is calculated at KPH. Next outing I'll change it to MPH.
Cheers. mike
Peter posted 03-31-2008 06:23 AM ET (US)
The top speed (36 MPH) is right on the mark for a 50 HP motor on a classic 15 hull. However, it seems to me that it should plane off at a lower RPM. Try trimming the motor all the way in (down) when you launch onto plane.
Tohsgib posted 03-31-2008 11:37 AM ET (US)
For 3 people 36 is GREAT for a 50hp. A cruise speed of 4500rpm or less is optimal for long engine life. 4k is perfect if you like the way it handles at that speed.
mikejoyce77 posted 03-31-2008 09:43 PM ET (US)
hi there.
i talked to the dealer and he said i should cruise around 4,500 rpm for that engine. seems high.
i think i'll experiment a little bit more.
i had the trim all the way down most of the time. still experimenting with that also.
Sal DiMercurio posted 03-31-2008 11:28 PM ET (US)
Doesn't that engine max out at 6200 rpms?
If so, you need to lift that engine up a couple holes.
I would think that 50 hp could swing a 17p, if the engine was raisedup on the 2nd or 3rd set of holes.
Sal
mikejoyce77 posted 03-31-2008 11:59 PM ET (US)
the engine max rpm is 5850 rpm. if it hits 6000 rpm there's a safety rev limit.
the engine is mounted from the second hole from the bottom. I used the same holes as for the previous engine.
Peter posted 04-01-2008 07:05 AM ET (US)
Sal -- 13 inch pitch is the right size for that motor. That motor turns the small diameter propeller through a 1.85:1 gear ratio.
You're probably thinking of the old Evinrude/Johnson 50 where a 11 3/4 x 17 inch pitch was the common propeller. That higher pitch was possible because the E/J 50 turned the propeller through a 2.42:1 gear ratio.
jimh posted 04-01-2008 08:11 AM ET (US)
Cruise is usually at about three-quarter of full throttle. If your full-throttle speed is 5,800-RPM, then your cruise would be around 4,000 to 4,300.
Tohsgib posted 04-01-2008 09:57 AM ET (US)
Your cruise is wherever you want it to be. You asked if 4,500 was too high and no it is about the upper limit for cruising 24/7. Weather conditions may not allow you to cruise at 4,500 all the time or you may just find that 4,300 it sounds sweeter, etc. You can not tell someone that 4500 is the cruise, that is the indviduals taste. But I agree with Jim that 38-4300 would be where I would find my sweet spot.
mikejoyce77 posted 04-01-2008 11:53 PM ET (US)
I calculated four people and gear to come up with the 13-inch pitch prop. With three people on the boat the engine speed was 5,800-RPM at full throttle. It should be between 5,400 and 5,850. If I'm alone or with one other person, RPM may be higher than 5,850. Should I consider a higher pitch prop? Maybe a 15-inch pitch?
Tohsgib posted 04-02-2008 09:55 AM ET (US)
I always prop my boat to run as close to WOT with just me in the boat. With 3 people it should still be within rom range. Try a 14 or 15" and see how you like the way it handles. I would put a bigger prop on it.
mikejoyce77 posted 04-20-2008 08:38 PM ET (US)
hi there,
I'm told i should have a second prop on board the boat. I have the 13" pitch. I'm happy with that prop. but i would like to try a 14" prop. mostly for cruising. do you think the 13" prop will be able to pull a skier w/ two skis that weighs 130 lbs.
If the 13" prop will work for pulling a skier, that would be great. than i could go with the 13" and 14".
or should i use a 12" pitch for pulling. the catch is i allready own the 13" prop.
Tohsgib posted 04-21-2008 11:30 AM ET (US)
Mike...I have to be sarcastic on this one. You own the boat and the prop so why are you asking us what it can do? Like Nike says...JUST DO IT!
mikejoyce77 posted 04-21-2008 08:18 PM ET (US)
[I]'m wondering what[']s my best selection for a second prop[?] [T]hat[']s all. 12" or 14"[?]
Sonic posted 04-21-2008 11:19 PM ET (US)
Mike,
Seeing as how you are getting to the upper rev limit with the 13" prop, and the engine hasn't fully loosened up yet, I would recommend the 14" prop as a spare. The change in pitch by 1" will only change your max RPM by about 200 RPM.
A 50hp motor should be fine to pull up a 130# skiier when propped like yours is. I used to ski behind a 35hp 13' Sport when I was that weight, no problem.
Tom W Clark posted 04-21-2008 11:34 PM ET (US)
I recommend the 10-1/2" x 13" Stiletto Triad II hubbed for Nissan, part #62313.
mikejoyce77 posted 04-22-2008 11:13 PM ET (US)
[H]ey [T]om.
I looked at the [S]tilleto [T]riad propellers. [M]ost likely [I am] going with the 10.5" to 14" propeller. [W]hat[']s different between the [T]riad II and the [T]riad I?
[W]here did you research your information for the propeller[?].
[T]hanks [--] mike.
Tom W Clark posted 04-23-2008 09:57 AM ET (US)
Mike,
The Triad I is a smaller prop for smaller outboards (25HP & 35 HP).
I used my personal experience and customer feedback selling the Triad line, ContinuousWave and literature sent to me by Precision Propeller to research the Triad recommendation.
The 13" Triad will probably perform like a 14" OEM prop.
mikejoyce77 posted 05-24-2008 12:37 PM ET (US)
[H]ey [T]om. [T]he last couple of weeks [I]'ve been trying to find a 14-inch stainless steel propeller to demo. [N]o luck. [W]ould the 10-1/2-inch x 13-inch Stiletto Triad II prop have a better hole shot than the stock propeller?
I went for a three day camping trip last weekend with the boat. [I] had four adults, 12 gallons of fuel, camping gear, cooler full, fishing gear, and down riggers. [L]et's say I had a lot of weight. [T]he boat got up on plane but it took 35 seconds to get to 21-MPH. conditions were rough and chopy. [O]verall [I] was happy how it performed with the weight on the boat. If the 10-1/2" x 13" Stiletto Triad II will have a better hole shot [I]'m sold on this propeller.
Where would you recomend purchasing this product? Over the web or local dealer. I've found it cheaper on the internet.
[T]hanks. mike

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Author	Topic: SPORT 15, 50-HP Nissan TLDI
mikejoyce77	posted 03-31-2008 12:31 AM ET (US) Sunday was a nice day so I took my 1981 Boston Whaler SPORT 15 out for the first time after its restoration. I have a 2008 Nissan 50-HP TLDI engine. I have a 11.1-inch diameter and 13-inch pitch prop on the boat. I am following the break-in period schedule. I have to run the first three hours at 3,500-RPM with full throttle only one minute. I had three people onboard weight 460-lbs, six gallons of fuel, and battery. I found that I could just start to [reach plane] at 3,500-RPM. It almost seemed that there was a little bit too much drag in the back of the boat. Speed was 28-KPH. At 3,800-RPM planing was a little better. Speed 32-KPH. At 4,000-RPM planning was really good. Speed 36-KPH. At full throttle 5,800-RPM speed was 58-KPH now I'm fairly new to this. Is 4,000-RPM to cruise at too hard on the engine? I'm going to talk to my dealer tomorrow. What do you guys think? This engine is extremely quiet, and wow, out for two hours, I barely used any gas. Can't belive how fuel efficient this is. and with oil too. Sorry speed is calculated at KPH. Next outing I'll change it to MPH. Cheers. mike
Peter	posted 03-31-2008 06:23 AM ET (US) The top speed (36 MPH) is right on the mark for a 50 HP motor on a classic 15 hull. However, it seems to me that it should plane off at a lower RPM. Try trimming the motor all the way in (down) when you launch onto plane.
Tohsgib	posted 03-31-2008 11:37 AM ET (US) For 3 people 36 is GREAT for a 50hp. A cruise speed of 4500rpm or less is optimal for long engine life. 4k is perfect if you like the way it handles at that speed.
mikejoyce77	posted 03-31-2008 09:43 PM ET (US) hi there. i talked to the dealer and he said i should cruise around 4,500 rpm for that engine. seems high. i think i'll experiment a little bit more. i had the trim all the way down most of the time. still experimenting with that also.
Sal DiMercurio	posted 03-31-2008 11:28 PM ET (US) Doesn't that engine max out at 6200 rpms? If so, you need to lift that engine up a couple holes. I would think that 50 hp could swing a 17p, if the engine was raisedup on the 2nd or 3rd set of holes. Sal
mikejoyce77	posted 03-31-2008 11:59 PM ET (US) the engine max rpm is 5850 rpm. if it hits 6000 rpm there's a safety rev limit. the engine is mounted from the second hole from the bottom. I used the same holes as for the previous engine.
Peter	posted 04-01-2008 07:05 AM ET (US) Sal -- 13 inch pitch is the right size for that motor. That motor turns the small diameter propeller through a 1.85:1 gear ratio. You're probably thinking of the old Evinrude/Johnson 50 where a 11 3/4 x 17 inch pitch was the common propeller. That higher pitch was possible because the E/J 50 turned the propeller through a 2.42:1 gear ratio.
jimh	posted 04-01-2008 08:11 AM ET (US) Cruise is usually at about three-quarter of full throttle. If your full-throttle speed is 5,800-RPM, then your cruise would be around 4,000 to 4,300.
Tohsgib	posted 04-01-2008 09:57 AM ET (US) Your cruise is wherever you want it to be. You asked if 4,500 was too high and no it is about the upper limit for cruising 24/7. Weather conditions may not allow you to cruise at 4,500 all the time or you may just find that 4,300 it sounds sweeter, etc. You can not tell someone that 4500 is the cruise, that is the indviduals taste. But I agree with Jim that 38-4300 would be where I would find my sweet spot.
mikejoyce77	posted 04-01-2008 11:53 PM ET (US) I calculated four people and gear to come up with the 13-inch pitch prop. With three people on the boat the engine speed was 5,800-RPM at full throttle. It should be between 5,400 and 5,850. If I'm alone or with one other person, RPM may be higher than 5,850. Should I consider a higher pitch prop? Maybe a 15-inch pitch?
Tohsgib	posted 04-02-2008 09:55 AM ET (US) I always prop my boat to run as close to WOT with just me in the boat. With 3 people it should still be within rom range. Try a 14 or 15" and see how you like the way it handles. I would put a bigger prop on it.
mikejoyce77	posted 04-20-2008 08:38 PM ET (US) hi there, I'm told i should have a second prop on board the boat. I have the 13" pitch. I'm happy with that prop. but i would like to try a 14" prop. mostly for cruising. do you think the 13" prop will be able to pull a skier w/ two skis that weighs 130 lbs. If the 13" prop will work for pulling a skier, that would be great. than i could go with the 13" and 14". or should i use a 12" pitch for pulling. the catch is i allready own the 13" prop.
Tohsgib	posted 04-21-2008 11:30 AM ET (US) Mike...I have to be sarcastic on this one. You own the boat and the prop so why are you asking us what it can do? Like Nike says...JUST DO IT!
mikejoyce77	posted 04-21-2008 08:18 PM ET (US) [I]'m wondering what[']s my best selection for a second prop[?] [T]hat[']s all. 12" or 14"[?]
Sonic	posted 04-21-2008 11:19 PM ET (US) Mike, Seeing as how you are getting to the upper rev limit with the 13" prop, and the engine hasn't fully loosened up yet, I would recommend the 14" prop as a spare. The change in pitch by 1" will only change your max RPM by about 200 RPM. A 50hp motor should be fine to pull up a 130# skiier when propped like yours is. I used to ski behind a 35hp 13' Sport when I was that weight, no problem.
Tom W Clark	posted 04-21-2008 11:34 PM ET (US) I recommend the 10-1/2" x 13" Stiletto Triad II hubbed for Nissan, part #62313.
mikejoyce77	posted 04-22-2008 11:13 PM ET (US) [H]ey [T]om. I looked at the [S]tilleto [T]riad propellers. [M]ost likely [I am] going with the 10.5" to 14" propeller. [W]hat[']s different between the [T]riad II and the [T]riad I? [W]here did you research your information for the propeller[?]. [T]hanks [--] mike.
Tom W Clark	posted 04-23-2008 09:57 AM ET (US) Mike, The Triad I is a smaller prop for smaller outboards (25HP & 35 HP). I used my personal experience and customer feedback selling the Triad line, ContinuousWave and literature sent to me by Precision Propeller to research the Triad recommendation. The 13" Triad will probably perform like a 14" OEM prop.
mikejoyce77	posted 05-24-2008 12:37 PM ET (US) [H]ey [T]om. [T]he last couple of weeks [I]'ve been trying to find a 14-inch stainless steel propeller to demo. [N]o luck. [W]ould the 10-1/2-inch x 13-inch Stiletto Triad II prop have a better hole shot than the stock propeller? I went for a three day camping trip last weekend with the boat. [I] had four adults, 12 gallons of fuel, camping gear, cooler full, fishing gear, and down riggers. [L]et's say I had a lot of weight. [T]he boat got up on plane but it took 35 seconds to get to 21-MPH. conditions were rough and chopy. [O]verall [I] was happy how it performed with the weight on the boat. If the 10-1/2" x 13" Stiletto Triad II will have a better hole shot [I]'m sold on this propeller. Where would you recomend purchasing this product? Over the web or local dealer. I've found it cheaper on the internet. [T]hanks. mike