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Posting a reply to: Re: 1998 Ranger 692 Performance/Prop Issues

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[QUOTE]OnceBit - 7/27/2012  12:57 PM

The way Ricky explained to me on venting these props is start with all the plugs in and test run the boat. Watching the rpms closely, throttle down to WOT coming out of the hole and look for the rpm range to quickly get into the 3-4 thousand rpm band. Any more then this would be signs of prop slipage. So I took my boat out and made several runs increasing the vent hole sizing each time watching the rpms closely looking for that magical power range coming out of the hole. The best I could get mine was with all the plugs out I will get 2500-3000 rpm like right now as it gets up on plane.

My problem is...(and this is the reason I even messed with the prop to begin with)...is when my partner or my two sons get in the boat and I take off the motor bogs down and won't take off unless somebody gets up front. I know whats happening I just don't know why this is happening. You guys know that exhaust vent in the back of the motor? There like a**holes every outboard has one. When I get additional weight in the boat and go to take off the motor sinks enough where that vent goes under water to point it can't vent apparently allowing the exhaust to flow freely from the engine...so it stumbles. When the guys go up to the front deck the back of the motor comes up enough uncovering the vent and allowing the engine to breath and it takes right off like a raped ape. At least this is what appears to me to be happening. I can't seem to find a good mechanic up in these neck of the woods. Not saying anything bad about the community...let's just say they operate at thier own pace. I also believe they don't see alot of repair work cause they don't seem updated. Can anyone recommend a good mechanic with in few hours of Cass lake...I would be willing to travel. I need someone motivated and willing to put the time and effort in diagnostics, cause more than likely I do have a performance/setup problem.[/QUOTE]

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OnceBit

Posted 7/27/2012 12:57 PM (#574389 - in reply to #574149)
Subject: Re: 1998 Ranger 692 Performance/Prop Issues

Posts: 99

Right now I am running a 19p Rev4 with all vent plugs out. Once I get on plane 1/2 tank gas me by myself I slowly bring the trim up watching my rpms and speed together on my smartcraft gauges looking for maximum speed. Max speed is 49 mph at 5600rpm. I can trim up more (over trim) and get more rpms but the speed doesn't change so that tells me with my set up (weight & distribution ect...) 5600 rpm is the most efficient running rpm with this prop.

The way Ricky explained to me on venting these props is start with all the plugs in and test run the boat. Watching the rpms closely, throttle down to WOT coming out of the hole and look for the rpm range to quickly get into the 3-4 thousand rpm band. Any more then this would be signs of prop slipage. So I took my boat out and made several runs increasing the vent hole sizing each time watching the rpms closely looking for that magical power range coming out of the hole. The best I could get mine was with all the plugs out I will get 2500-3000 rpm like right now as it gets up on plane.

My problem is...(and this is the reason I even messed with the prop to begin with)...is when my partner or my two sons get in the boat and I take off the motor bogs down and won't take off unless somebody gets up front. I know whats happening I just don't know why this is happening. You guys know that exhaust vent in the back of the motor? There like a**holes every outboard has one. When I get additional weight in the boat and go to take off the motor sinks enough where that vent goes under water to point it can't vent apparently allowing the exhaust to flow freely from the engine...so it stumbles. When the guys go up to the front deck the back of the motor comes up enough uncovering the vent and allowing the engine to breath and it takes right off like a raped ape. At least this is what appears to me to be happening. I can't seem to find a good mechanic up in these neck of the woods. Not saying anything bad about the community...let's just say they operate at thier own pace. I also believe they don't see alot of repair work cause they don't seem updated. Can anyone recommend a good mechanic with in few hours of Cass lake...I would be willing to travel. I need someone motivated and willing to put the time and effort in diagnostics, cause more than likely I do have a performance/setup problem.