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TOPIC: WOT problem

WOT problem 22 Jun 2009 16:08 #1

  • cityblues2252
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Got the boat out Saturday and motor ran really smooth. The only problem I'm having is obtaining WOT. Last season I ran a 16 x 16 aluminum prop and was able to hit the lower end of WOT at around 4400-4500 rpms and 37 mph (GPS). This season I thought going down in pitch would give me a little higher rpms so I put a 15-1/4 x 15 aluminum on and now I'm only able to squeeze out 3700 rpms and 26 mph (GPS). I checked the throttle cable and at full throttle everything appears normal at the carb. I did have the plugs and fuel filter changed at the beginning of this season and weight load is about the same if not a little lower than last season.

Any ideas?

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Tim
1990 Carver Santego 2767
Single Volvo Penta 7.4L - AQ290DP
Flowing Wells Marina
Lake Texoma, Texas

WOT problem 22 Jun 2009 16:26 #2

  • JohnL
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you put in a smaller prop, and your WOT rpm went down. Something is not right elsewhere... condition of hull? Prop damaged? O/D trim setting? Put the original 16x16 prop back on and see what happens.

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Blue Highways
93 2452

WOT problem 22 Jun 2009 16:50 #3

  • cityblues2252
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Exactly...hull was power washed before putting in and the prop is brand new. Trimmed it up like normal until I got max rpms - just will not go above 3700-3800. I didn't have the old prop with me but will try it this weekend.

Does anyone know the stock prop size for this configuration? When I run the prop wizard from http://www.turningpointpropellers.com with half fuel (35gal and 3 to 4 people) - I get 14-1/4 x 23 which would drive rpms even lower.

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Tim
1990 Carver Santego 2767
Single Volvo Penta 7.4L - AQ290DP
Flowing Wells Marina
Lake Texoma, Texas

WOT problem 22 Jun 2009 20:02 #4

  • bhawes
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Check to make sure that you received the correct plugs and that they were properly gapped. Pulling 1 out and checking it should give you a good indication. You didn't go to a 4 blade by any chance did you? Did you notice any difference with your hole shot?

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Bob Hawes.
Kelowna, B.C.
1998 Trophy 2052 WA
4.3 Vortec, A1 G2

WOT problem 22 Jun 2009 21:02 #5

  • biohazard
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there is also diameter and cup of the prop that can play a significant factor.

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Ryan
Hastings, Minnesota

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"Sonnie Due"
1999 Bayliner Ciera 3055
Twin Mercruiser 5.7L Bravo 2[/FONT]
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