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Engine for 1981 Sport 15
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| Petrus |
Posted on 03/16/14 - 2:21 AM
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I would go for the Yamaha 70. Lots of 50/60 hp motors are close to that weight.
1997 Montauk 17, Suzuki DF90A |
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| Petrus |
Posted on 03/16/14 - 2:33 AM
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Joe Kriz wrote:
That's only a difference of 51 pounds.
Were are you coming up with 100 pounds difference?
His 50hp carburated 160lbs Tohatsu
Edited by Joe Kriz on 03/17/14 - 9:30 AM
1997 Montauk 17, Suzuki DF90A |
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| wlagarde |
Posted on 03/16/14 - 4:44 AM
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My model (2005 pre-TLDI carbureted) is 160lbs as stated by Nissan.
Edited by wlagarde on 03/16/14 - 5:01 AM
1976 Sport 15 w/ 2005 50hp Nissan 2 stroke |
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| dgoodhue |
Posted on 03/16/14 - 5:02 AM
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15' whaler will easily handle a 260# motor. The 80's OMC 60 & 70's that comon used on new 15' were 260#, mercury 70's 275#, & Yamaha 70's 240#.
Dave |
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| wlagarde |
Posted on 03/16/14 - 5:56 AM
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Yes - The 15 classic will handle 250# without a problem. The new SuperSport 150 comes with a 60hp Mercury and weighs a good deal more than the classic (900# vs 550#). The point I'm making is that in a small boat like the 15 classic, weight makes a difference. The 1981 50hp Johnson is rated at the crankshaft not the propeller shaft and it's old so really like having a 40hp by todays standards (hp now rated at propeller shaft). My boat with the 160# 2005 50hp Nissan flys and tops out a 39mph. I'm sure the new 70 will get some additional mph but how many? I'm really curious for the $$ how many mph do you get?
Edited by wlagarde on 03/16/14 - 7:22 AM
1976 Sport 15 w/ 2005 50hp Nissan 2 stroke |
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| FlyAU98 |
Posted on 03/16/14 - 8:03 AM
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New F70LA on my 1987 15' Super Sport. Speed is in the low 40s, but top sipped isn't all of it. I've been on some rental 15s, with 50s, and the performance between the 50 and 70 is remarkable...top speed isn't the only difference.
(moderator note: please follow guideline #1 as use the full four digit year)
Edited by Joe Kriz on 03/16/14 - 9:52 AM |
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| wlagarde |
Posted on 03/16/14 - 8:06 AM
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What are are the other differences? My hole shot is outstanding and I pull my children skiing without any problems.
Edited by wlagarde on 03/16/14 - 8:22 AM
1976 Sport 15 w/ 2005 50hp Nissan 2 stroke |
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| Tom W Clark |
Posted on 03/16/14 - 9:23 AM
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I think we are drifting a little far afield of pensmith's original question.
I think we can all acknowledge that wlagarde is getting great performance from his nine year old two stroke 50 HP Nissan.
Perhaps pensmith would consider a two stroke 50 HP Nissan if they were still made, but they are not.
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| tedious |
Posted on 03/17/14 - 5:11 AM
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pensmith wrote:
Thanks for the advice guys! My local dealer will install a 2014 Yamaha F-70 for $7500 out the door. The F-60 is about 8 lbs. lighter and about $500 less money. My dealer says that the difference between the 60 and 70 is air intake configuration, and ECM. I had a Sport 15 with a Johnson 70 (no trim and tilt), and it would "chine walk at WOT. I believe that was due to improper trim.
That's a truly outstanding price for the F70 - I paid just a little less than that 4 years ago for the bare motor. Your dealer left out the 16-valve cylinder head on the F70, vs. the 8-valve on the F60 - although I guess that's part of the air intake configuration, it's a bit more than that.
Tim
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| Dave1966 |
Posted on 03/17/14 - 7:03 AM
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I'm considering the same power for my 1987 15' sport and am also interested to hear opinion(s) about such a set up...weight concern, hole shot, etc. I plan to tube/ski with the kids, watch my kids sail (which means idles speed) and general cruising. I am not interested in buzzing around at 35+ all day and have been told that the four strokes want/need to be pushed to the higher RPMs to run properly...is this true? I'm also considering the 60hp e-tec but am wondering if the Yamaha would be a better option long term. As all have mentioned, that price is outstanding and I would go that route if it were an option...I've been quoted $9k for the F70 with new controls, prop and mounted. As a comparison, the all in price for the 60 e-tec would be $7,800. The dealer I've been talking to, who sells both Evinrude and Yamaha, recommends the e-tec...he feels it is just as good as the Yamaha in all aspects but cost of ownership would be noticeably less. Any thoughts would be appreciated.
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| tom blinstrub |
Posted on 03/17/14 - 7:33 AM
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Nissan and Tohatsu do still make their 2 stroke 50 hp engine however it is fuel injected and somehow picked up 45 lbs over the older carb motor. They also are making a 40 and a 50 hp 4 stroke engine new this year. Both engines are in the 2014 brochure.
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| Tom W Clark |
Posted on 03/17/14 - 7:44 AM
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Yes, and they are in the list of engine choices for the 15 footers already mentioned at the beginning if this thread.
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| Tom W Clark |
Posted on 03/17/14 - 7:51 AM
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I don't think there is a 40 to 70 HP outboard made today that would be a bad choice for a Sport 15.
It is silly for anybody to say that a 15 shouldn't have a motor that weighs more than 160 pounds.
I've spent time water skiing behind a neighbor's Sport 15 with a Suzuki DF70 at 341 pounds and it performed great.
70 HP on a Sport 15 should be good for 42-44 MPH. If you don't need that much top speed a 50 or 60 HO motor would be just fine.
The two cylinder E-TECs are great motors, My father-in-law owns one in Maine (40 HP on a 17' Triumph) and it is damn near a zero maintenance motor. It spends that vast majority of its time running at idle and sub-planing speeds but will leap on plane if you ask it to.
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| Tom W Clark |
Posted on 03/17/14 - 7:54 AM
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I...have been told that the four strokes want/need to be pushed to the higher RPMs to run properly...is this true?
Yes and no. Four strokes tend to have higher RPM ranges because they do not develop as much torque in the mid range that two strokes do.
This should NOT be construed to mean that they need to be run hard. They do not and will be very happy idling around.
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| dgoodhue |
Posted on 03/18/14 - 9:59 AM
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I suspect that the 60 Etec will have mid range torque (DI 2 stroke) than the Yamaha 70hp 4 stroke. Obviously the 70hp Yamaha will have a higher top speed. I don't think you could go wrong with either. The classic 15' whaler is a light hull so it won't be as sensitive to torque as other heavier hulls.
Dave |
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