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Author Topic:   Temptation 22 Sterndrive Top Speed - 454

talty posted 12-31-2008 04:43 PM ET (US)
I recently purchased a 1988 22' Temptation powered with a 7.4-L Mercruiser sterndrive with Bravo One. I was told by the previous owner that he had the boat up to 70-MPH on a few occasions. Does that sound right? I was thinking that with this setup, it would be lucky to hit 55-60 MPH. Does anyone have experience with this setup?
Tom W Clark posted 12-31-2008 06:43 PM ET (US)
Unless the engine is highly modified from its original 330 HP configuration, there is no way the boat would hit 70 MPH. 55 MPH is a more reasonable estimate of its top speed.
towboater posted 12-31-2008 08:40 PM ET (US)
Sounds like a fun rig.
A good friend is running a 07 496 Volvo dual prop on a heavy 24 ft Bluewater that WILL do 70.
Another pal runs a 460 Merc in a 22 ft Mirage that will do 70.
The guy I sold my 22 ft Taylor to (built 460 block, Berkley Pump) says he changed impellers and now goes 70. I could only get it up to 65.
Even tho Ive never been in a Temptation, the hulls Ive mentioned are as heavy AND the Taylor is lighter, Im sure your boat will make 70. Like Tom says, whether or not the engine & leg will get it there is another story.
Beware, as you contemplate modifications or rebuilding, Marine blocks are heavier than car blocks due to nickle content. Bore it out the minimum, go with RV cam and a mild 4 barrel for longevity over racing. The 80's 454 engines and heads Ive been around dont last on built engines.
mk
Wasatch Whaler posted 01-01-2009 10:47 AM ET (US)
I agree with Tom.
I had a 23' Velocity with a 454 Magnum engine.
The Magnum was rated at 365 HP instead of the 7.4's 330. The Magnum was built as a high performance engine: Forged pistons, forged crank, four-bolt main block, better heads, cam, intake, etc, etc. (Think Corvette engine vs station wagon.)
The Velocity hull was designed to go fast (as opposed to the Temptation). Additionally, I was running a custom four blade Spinelli propeller.
The fastest I ever got that boat was 72 mph.
The only way a Temptation will hit an honest 70 mph is with major engine modifications.
talty posted 01-01-2009 11:32 AM ET (US)
Thanks for the input gents. I figured 70 MPH was pretty optimistic :). 55 MPH should be plenty of speed for me. Any rough idea of what the fuel consumption will be--just roughly? I know there are a lot of factors like weight in boat, sea conditions, speed, etc.
jimh posted 01-01-2009 04:44 PM ET (US)
A four-cycle inboard motor ought to have a brake specific fuel consumption of around 0.45 to 0.5-lbs/HP-hr.
TransAm posted 01-01-2009 07:01 PM ET (US)
I own a 25' Temptation with twin 250 HP outboards. I have seem 61 MPH; I could not imagine 70 MPH on that hull. Although the 25' Temptation (whalerdrive) is considerably heavier and effectively 4' longer, it would seem to me you would need close to 500 HP to push the 22' model to 70 MPH. There was a fellow who outfitted a 25' Temptation about a year ago with twin 300 HP Mercury XS outboards and hit 72. I don't think he had dialed in a prop either.
Tohsgib posted 01-02-2009 11:00 AM ET (US)
55 is a good estimate. My 24 Baja with 400hp and weighed 4000lbs would hit 65 on a good day. Before I moded the motor with the 330hp she would run like 58 on a good day. Fuel consumption was actually really good. I would get 3+mpg at cruise. The only thing I dislike about I/O's is the wander at idle speeds which can be annoying for long periods.
Plotman posted 01-08-2009 03:15 PM ET (US)
My outrage is the same hull as your temptation.
After installing some new jackplates and playing around with engine height, I saw 53.7 mph on my GPS on a cold November day this fall.
I'm willing to bet I could have hit 55 if I had had more time to play, but it was cold (which helps speed, but wasn't much fun for me), and I figured I had the fuel stabilizer thoroughly mixed in the tank and treated fuel pulled in to the engines, so I went in.
This is with twin Yamaha 130 outboards.

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Author	Topic: Temptation 22 Sterndrive Top Speed - 454
talty	posted 12-31-2008 04:43 PM ET (US) I recently purchased a 1988 22' Temptation powered with a 7.4-L Mercruiser sterndrive with Bravo One. I was told by the previous owner that he had the boat up to 70-MPH on a few occasions. Does that sound right? I was thinking that with this setup, it would be lucky to hit 55-60 MPH. Does anyone have experience with this setup?
Tom W Clark	posted 12-31-2008 06:43 PM ET (US) Unless the engine is highly modified from its original 330 HP configuration, there is no way the boat would hit 70 MPH. 55 MPH is a more reasonable estimate of its top speed.
towboater	posted 12-31-2008 08:40 PM ET (US) Sounds like a fun rig. A good friend is running a 07 496 Volvo dual prop on a heavy 24 ft Bluewater that WILL do 70. Another pal runs a 460 Merc in a 22 ft Mirage that will do 70. The guy I sold my 22 ft Taylor to (built 460 block, Berkley Pump) says he changed impellers and now goes 70. I could only get it up to 65. Even tho Ive never been in a Temptation, the hulls Ive mentioned are as heavy AND the Taylor is lighter, Im sure your boat will make 70. Like Tom says, whether or not the engine & leg will get it there is another story. Beware, as you contemplate modifications or rebuilding, Marine blocks are heavier than car blocks due to nickle content. Bore it out the minimum, go with RV cam and a mild 4 barrel for longevity over racing. The 80's 454 engines and heads Ive been around dont last on built engines. mk
Wasatch Whaler	posted 01-01-2009 10:47 AM ET (US) I agree with Tom. I had a 23' Velocity with a 454 Magnum engine. The Magnum was rated at 365 HP instead of the 7.4's 330. The Magnum was built as a high performance engine: Forged pistons, forged crank, four-bolt main block, better heads, cam, intake, etc, etc. (Think Corvette engine vs station wagon.) The Velocity hull was designed to go fast (as opposed to the Temptation). Additionally, I was running a custom four blade Spinelli propeller. The fastest I ever got that boat was 72 mph. The only way a Temptation will hit an honest 70 mph is with major engine modifications.
talty	posted 01-01-2009 11:32 AM ET (US) Thanks for the input gents. I figured 70 MPH was pretty optimistic :). 55 MPH should be plenty of speed for me. Any rough idea of what the fuel consumption will be--just roughly? I know there are a lot of factors like weight in boat, sea conditions, speed, etc.
jimh	posted 01-01-2009 04:44 PM ET (US) A four-cycle inboard motor ought to have a brake specific fuel consumption of around 0.45 to 0.5-lbs/HP-hr.
TransAm	posted 01-01-2009 07:01 PM ET (US) I own a 25' Temptation with twin 250 HP outboards. I have seem 61 MPH; I could not imagine 70 MPH on that hull. Although the 25' Temptation (whalerdrive) is considerably heavier and effectively 4' longer, it would seem to me you would need close to 500 HP to push the 22' model to 70 MPH. There was a fellow who outfitted a 25' Temptation about a year ago with twin 300 HP Mercury XS outboards and hit 72. I don't think he had dialed in a prop either.
Tohsgib	posted 01-02-2009 11:00 AM ET (US) 55 is a good estimate. My 24 Baja with 400hp and weighed 4000lbs would hit 65 on a good day. Before I moded the motor with the 330hp she would run like 58 on a good day. Fuel consumption was actually really good. I would get 3+mpg at cruise. The only thing I dislike about I/O's is the wander at idle speeds which can be annoying for long periods.
Plotman	posted 01-08-2009 03:15 PM ET (US) My outrage is the same hull as your temptation. After installing some new jackplates and playing around with engine height, I saw 53.7 mph on my GPS on a cold November day this fall. I'm willing to bet I could have hit 55 if I had had more time to play, but it was cold (which helps speed, but wasn't much fun for me), and I figured I had the fuel stabilizer thoroughly mixed in the tank and treated fuel pulled in to the engines, so I went in. This is with twin Yamaha 130 outboards.