[To repower my 1988 SUPER SPORT LIMITED 17 boat] I have bought a 2022 TOHATSU 90-HP four-stroke-power-cycle engine. I have not bought a propeller.
Give me advice on a propeller.
Engine Type: Tohatsu MFS90AETL Four Stroke
Horsepower: 90
Cylinders: 4
Shaft Length: 20-inches
Steering: Remote mechanical
Starter: Electric
Weight: 392-lbs
Full Throttle Range: 5000 to 6000 RPM
Displacement: 1995 cc
Induction System: EFI
Gear Case 2.08:1
1988 SUPER SPORT LIMITED 17 Re-power
Re: 1988 SUPER SPORT LIMITED 17 Re-power
If you think the boat has a speed potential of 40-MPH, use a 16-pitch propeller.
A better recommendation can be given if you answer these questions:
Q1: What was the top boat speed for the 1988 SUPER SPORT LIMITED 17 with its previous engine?
Q2: What was the horsepower of the previous engine?
A better recommendation can be given if you answer these questions:
Q1: What was the top boat speed for the 1988 SUPER SPORT LIMITED 17 with its previous engine?
Q2: What was the horsepower of the previous engine?
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Re: 1988 SUPER SPORT LIMITED 17 Re-power
Thanks for the reply Jim.
Previous motor was a 1988 Johnson V4 90 HP. Boat would run 38-39 mph on GPS with two people (350lbs) and about 10 gallons of fuel
Previous motor was a 1988 Johnson V4 90 HP. Boat would run 38-39 mph on GPS with two people (350lbs) and about 10 gallons of fuel
Re: 1988 SUPER SPORT LIMITED 17 Re-power
Owner recommendations for this Whaler model/outboard combination include:
Ballistic 13.5x17 Stainless
Mercury Vengance 13x17 (Hub kit - 835284Q 1)
*Note size only applies to the specific prop model listed and engine is mounted 2-holes up, with the top bolt in the 3rd hole down from the top.
Ballistic 13.5x17 Stainless
Mercury Vengance 13x17 (Hub kit - 835284Q 1)
*Note size only applies to the specific prop model listed and engine is mounted 2-holes up, with the top bolt in the 3rd hole down from the top.
1992 Outrage 17
2019 E-TEC 90
2018 LoadRite 18280096VT
Member since 2003
2019 E-TEC 90
2018 LoadRite 18280096VT
Member since 2003
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- Posts: 5
- Joined: Fri Aug 26, 2022 7:45 pm
Re: 1988 SUPER SPORT LIMITED 17 Re-power
Thank you Phil.
Re: 1988 SUPER SPORT LIMITED 17 Re-power
Assuming the engine can accelerate to 5,500-RPM with a 17-pitch propeller, a boat speed of 38 to 39-MPH (which is statute miles not nautical miles) looks quite reasonable, assuming the propeller SLIP is less than 10-percent.
My PROPELLER CALCULATOR can help you assess propeller selection when working in statute miles dimensions.
If you prefer to work in nautical miles use the alternate calculator.
My PROPELLER CALCULATOR can help you assess propeller selection when working in statute miles dimensions.
If you prefer to work in nautical miles use the alternate calculator.
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Re: 1988 SUPER SPORT LIMITED 17 Re-power
Since I now have more than ten hours run time on the Tohatsu 90 HP engine, that allows me to get in some short full throttle runs. Here is one data point:
At full-throttle the TOHATSU 90-HP engine accelerated to 5,600-RPM, and the boat speed was then 41-MPH. There were runs on two directions with this outcome.
For this performance data, aboard the boat were me (245-lbs), a dog (40-lbs), 16-gallons of fuel (100-lbs), and a battery (50-lbs)
The 1988 SUPER SPORT LIMITED 17 with TOHATSU 90-HP engine sits in static trim a little low by the stern. In the future I will move the fuel tank and the battery forward to be underneath the front seat.
Sea condition were a light chop with a 10-knot breeze on the beam.
My impression of the boat performance with the SOLAS 13.2 x 19-pitch aluminum propeller was good.
Acceleration at full-throttle from a standing start was excellent. The bow rise was very little. The hull trims-out nicely..
The engine mounting height is three-holes-up from lowest possible.
The TOHATSU 90-HP has a working maximum engine speed between 5,000 and 6,000-RPM. Maximum engine speed is 6,300-RPM.
I plan to buy and test a stainless steel propeller.
I want to squeeze-out all the boat speed I can from the TOHATSU 90.
When I have more data available I will append the data to this thread
At full-throttle the TOHATSU 90-HP engine accelerated to 5,600-RPM, and the boat speed was then 41-MPH. There were runs on two directions with this outcome.
For this performance data, aboard the boat were me (245-lbs), a dog (40-lbs), 16-gallons of fuel (100-lbs), and a battery (50-lbs)
The 1988 SUPER SPORT LIMITED 17 with TOHATSU 90-HP engine sits in static trim a little low by the stern. In the future I will move the fuel tank and the battery forward to be underneath the front seat.
Sea condition were a light chop with a 10-knot breeze on the beam.
My impression of the boat performance with the SOLAS 13.2 x 19-pitch aluminum propeller was good.
Acceleration at full-throttle from a standing start was excellent. The bow rise was very little. The hull trims-out nicely..
The engine mounting height is three-holes-up from lowest possible.
The TOHATSU 90-HP has a working maximum engine speed between 5,000 and 6,000-RPM. Maximum engine speed is 6,300-RPM.
I plan to buy and test a stainless steel propeller.
I want to squeeze-out all the boat speed I can from the TOHATSU 90.
When I have more data available I will append the data to this thread
Re: 1988 SUPER SPORT LIMITED 17 Re-power
Did you forget the recommendations already posted for you?
1992 Outrage 17
2019 E-TEC 90
2018 LoadRite 18280096VT
Member since 2003
2019 E-TEC 90
2018 LoadRite 18280096VT
Member since 2003
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- Posts: 5
- Joined: Fri Aug 26, 2022 7:45 pm
Re: 1988 SUPER SPORT LIMITED 17 Re-power
No Phil, I remember. I am still doing my on own testing and collecting data