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#21
03-27-2019, 08:30 AM
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With the 17 pitch prop, you should be able to get above 5750 rpm’s. Your motor is mounted to low. I’m at the highest mounting hole and have no cavitation in tight turns and getting on plane, etc. I have an 18.5 pitch prop and can get higher rpm’s then you are getting with your 17.
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Snookerd 
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#22
03-27-2019, 07:24 PM
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Something is very very wrong with this setup. 26% prop slip at cruise is really really bad. 29% prop slip at WOT is WORSE. Are you sure you weren't towing the dock.
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#23
03-27-2019, 08:05 PM
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The C-10 gauge has an endless array of options on how you can set up the pages. Most people either don't know they can be changed or don't know how to change them. The new gauges due out soon are not as powerful (option wise) but are more user friendly and visually appealing.
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#24
03-28-2019, 06:48 AM
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I am going to take it for a ride today and double check my original stats.
Ed. The marina that installed the motor didn't have the new gauges. But it will be connected to my Lowrance GPS by the end of the week. Bigshrimpin not sure what 26% prop slip at cruise or what 29% prop slip at WOT means.
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#25
03-28-2019, 08:05 PM
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Did you get the TX or the AP? Either way something is bad wrong. As Danny said, the motor is way too low. That motor should spin an 18.5x 16 with no issue and you should be seeing 38-40 knots WOT lightly loaded. Have them mount the motor all the way to the top.
__________________
[b]The Moose is Loose !
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#26
03-28-2019, 09:33 PM
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Explanation
https://www.go-fast.com/prop_slip.htm "Slip is never a negative number, and will range from 5% on a light cat to 25% on a heavy workboat. Most hi performance applications will be between 7 and 12 percent." 25% - 30% slip at Cruise and Wide Open Throttle (WOT) puts you into the work boat (Barge) category. The 3.6L V6 models use a 2.29:1 ratio. (I made the assumption you have the 3.6L w/2.29 ratio when calculating the slip) The 4.0L V6 models use a 2.08:1 ratio. (if you have the 4.0L with the 2.08 ratio, slip numbers increase to 33% and 36%) Your prop is a 17P Plug the numbers into the prop slip calc below. Prop Slip Calc https://www.go-fast.com/Prop_Slip_Calculator.htm
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#27
03-29-2019, 09:13 AM
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Something is not right. I get 6200 wot, 41 kts with my 20P light load. I can cruise 26 kts at 4400rpm with a full load.
__________________
1973 Seacraft 20' SF "Sea Dog" 1988 Tracker/Seacraft 23' WA "Salty Dog"
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#28
04-11-2019, 07:42 AM
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I finally got out to run the motor last nigh and to get accurate information. This is what I found with a half tank of fuel and one passenger with the 17 inch prop.
3500 rpm 20 knots 4000 rpm 25 knots 4500 rpm 31 knots 5000 rpm 34 knots 5750 rpm 39 knots 5900 rpm 38 knots One thing I noticed when running the boat with a 2-3ft flowing swell, is the motor would go from 25knts to 21knts then back to 25knts after 30 to 60 seconds.
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#30
04-14-2019, 03:16 PM
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Quote:
__________________
[b]The Moose is Loose !
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Linear Mode
