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PostPosted: Mon Jun 26, 2017 8:45 am 
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Joined: Sun Jul 22, 2012 5:10 pm
Posts: 2032
Location: West Palm Beach, FL
Surface Interval wrote:
It still sounds to me like you are not getting full power. Four Winns specs for that set-up are 48 mph at 4500rpm and 50 mph at WOT with a 21" pitch prop. You decreased pitch 4" and the rpm rose 600 rpm to 4500. Unless the engine is not performing or someone has changed gear ratios in the outdrive to something noticeably lower than the 1.62:1, you should be getting much better performance from the 21p prop. The 17" should be going way over the 4800 rpm redline.

I had a similar loss of power situation on my 190 with the Volvo 5.0 EFI when I had an exhaust flapper valve come loose and created a partial blockage in the exhaust. That robbed me of a lot of power. The boat ran smooth but struggled to get on plane. RPM was 500 low and top speed was 10mph less.

+1

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"Knot Easy" 2000 Horizon 240 Volvo 5.7GS /SX
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prev. boats:
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PostPosted: Mon Jun 26, 2017 9:29 am 
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Dolphin

Joined: Thu Mar 02, 2017 9:11 am
Posts: 98
Location: Fort Pierre, SD
Thanks for the replies guys. At $100/hour, I'm expecting this to be a big expense. In the mean-time, do you think I'm hurting anything by running the 17p prop? As I said, it puts me at about 4500RPM at WOT.

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PostPosted: Mon Jun 26, 2017 8:57 pm 
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Joined: Sun May 20, 2012 4:31 pm
Posts: 873
Location: Minneapolis, MN
If the tach is accurate and you don't over rev the engine, then maybe you won't hurt it. The question is, what is going on? Some problems may not get worse, and some may cause harm. I would look at normal tune up items like spark plugs, checking dist cap and rotor, possibly a compression check, etc. At least look at the spark plugs to see if one or more are different like dirtier, more carbon, etc. Verify you don't have an exhaust blockage or an excessively dirty spark arrestor air cleaner. Does the engine run smoothly?

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Surface Interval: A scuba diving term for that time between dives to relax and prepare for life's next great adventure.

Current boat: '02 FW 268 Vista
Previous boat: '95 FW 190 Horizon


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PostPosted: Mon Jun 26, 2017 9:29 pm 
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Dolphin

Joined: Thu Mar 02, 2017 9:11 am
Posts: 98
Location: Fort Pierre, SD
Yes, the engine runs fine. I just bought the boat this year and have no idea when, if ever, it had a tune up.

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