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Posting a reply to: Re: Esox Magnum Porpoising

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[QUOTE]otto - 5/18/2017  6:33 PM

The fact you are able to get to 5200 RPM suggests that your are not significantly overpropped. If you dropped an inch of pitch to pick up your absolute WOT RPMs your top end would be around 26 mph factoring in 10% prop slip. On a motor that age, unless you've run Seafoam every tank and/or de-carbonized it, you may not even realize 5300 regardless.

Weight distribution (as noted) can be critical in boat performance and becomes more and more important the faster your wish to go. If you have power tilt/trim you can try trimming down a little lower than you have been running. I tend to ignore the "trim gauge" as a benchmark for adjustment rather use my boat performance and observe the relative indications it provides. I then duplicate that going forward. Mine does best when the gauge indicates just a little under dead even. It provides the best balance of top speed, handling and the ability to reach max RPMs. If your trim setting is manual (pin in the hole) maybe try dropping down one hole. This would keep more bow in the water and help your control.

I've only had enough experience with this stuff to be "half dangerous". I learn something new every day. Maybe this will be one of those times... Keep at it, you'll get it figured out. There's some pretty savvy folks chipping in.[/QUOTE]

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otto

Posted 5/18/2017 6:33 PM (#862068 - in reply to #862061)
Subject: Re: Esox Magnum Porpoising

Posts: 47

There's some pretty good advice here but confirming some details can help with a solution. If your WOT (Wide Open Throttle) RPM range is really 4700 - 5300 it sounds like your motor is a DF60 made between 1998 and 2009. If that is the case your lower unit has an even slower gear ratio - 2.42:1. Based on my boat speed calculator @ 5200 RPM you should not even be able to get to 31 mph. 30.5 mph would be it in a perfect world with zero prop slip. Most rigs will show about 10% slip give/take a little. If you are using your dash speed indicator instead of a GPS your top speed figure is most likely in error.

The fact you are able to get to 5200 RPM suggests that your are not significantly overpropped. If you dropped an inch of pitch to pick up your absolute WOT RPMs your top end would be around 26 mph factoring in 10% prop slip. On a motor that age, unless you've run Seafoam every tank and/or de-carbonized it, you may not even realize 5300 regardless.

Weight distribution (as noted) can be critical in boat performance and becomes more and more important the faster your wish to go. If you have power tilt/trim you can try trimming down a little lower than you have been running. I tend to ignore the "trim gauge" as a benchmark for adjustment rather use my boat performance and observe the relative indications it provides. I then duplicate that going forward. Mine does best when the gauge indicates just a little under dead even. It provides the best balance of top speed, handling and the ability to reach max RPMs. If your trim setting is manual (pin in the hole) maybe try dropping down one hole. This would keep more bow in the water and help your control.

I've only had enough experience with this stuff to be "half dangerous". I learn something new every day. Maybe this will be one of those times... Keep at it, you'll get it figured out. There's some pretty savvy folks chipping in.

Edited by otto 5/18/2017 6:48 PM