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  48hp SPL performance on a 15ft sport?

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Author Topic:   48hp SPL performance on a 15ft sport?
Mike001 posted 07-30-2003 09:53 AM ET (US)   Profile for Mike001   Send Email to Mike001  
What type of performance should I expect out of a 1988 Johnson SPL on my 1983 15ft sport?
Peter posted 07-30-2003 12:08 PM ET (US)     Profile for Peter  Send Email to Peter     
Hi Mike.

Using the performance predictor formula which is the square root of (50hp/1200lbs of the typically loaded 15) times the hull factor of 180 yields a predicted top speed of 36.7 mph.

I used to regularly see 35-36 mph as measured by GPS when that engine was on the Super Sport.

Mike001 posted 07-30-2003 01:22 PM ET (US)     Profile for Mike001  Send Email to Mike001     
Hi Peter,

Thanks for the info, I fixed the skeg on the motor,it looks like new. I might be selling the 48 before we use it, I'm looking at a 1982 70hp johnson.


Peter posted 07-30-2003 02:04 PM ET (US)     Profile for Peter  Send Email to Peter     
Having spent a little more time behind the wheel of the 15 Super Sport pushed by the 70 this past weekend, I have to say the hull really comes alive with the 70. In hindsight, I'm glad I went with the 70 rather than the 60. It's a lot of fun.

For me, I think I would have hung onto the 48 longer if it had had power trim.

Bigshot posted 07-30-2003 02:42 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Run that 48 for a while until you find a newer 70. They went to a different block and rated them at the prop in 1986. That 82 is a good engine but at 23 years old....she may be only doing 60hp in todays standards. I had a 1985 SS w/1988 48 and she would get pretty good with a 17" prop.

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