shakey55 Posted February 2, 2017 Share Posted February 2, 2017 Goodmorning FishRaiders. Took my Seafarer V-Sea (Johnson Oceanpro - 115hp two stroke) for a test yesterday after putting on an SE SPORT 400 hydrofoil that my lovely wife bought me for Christmas. Seeing she bought it, I thought at least I should give it a try. I must say this definitely got this heavy arse boat up on the plane quicker and kept it there at lower revs, it really is a different boat. Enough dribble, what I did note today was that the best revs I can get out of her is about 5250. I then had a look while running just above 3000 revs and I think the motor might need to be lifted a hole or two. It is currently in the second hole from the top of 4 holes. What are the thoughts of the experts. IMG_2110.mp4 Link to comment Share on other sites More sharing options...
rickmarlin62 Posted February 2, 2017 Share Posted February 2, 2017 is your cavitation plate level with the bottom of your hull ?.is your motor leg throwing up spray both sides ?..this subject has been brought up twice recently..raising your motor wont increase your revs .going down a pitch size on your prop will..when travelling go back and check if your new foil is sitting on top of the water or going thru it...rick Link to comment Share on other sites More sharing options...
Sigma Posted February 2, 2017 Share Posted February 2, 2017 Hi Shakey55, This will be interesting as I have exactly the same outboard. In saying that, my boat is a Quintrex 5.7mtr allie and I don't think that I have issues getting on plane once I hit the throttle. I just checked my holes and my height is also on the second hole from the top. Will follow to see if you get more out of her if you drop or raise the ouboard. Link to comment Share on other sites More sharing options...
shakey55 Posted February 2, 2017 Author Share Posted February 2, 2017 2 hours ago, rickmarlin62 said: is your cavitation plate level with the bottom of your hull ?.is your motor leg throwing up spray both sides ?..this subject has been brought up twice recently..raising your motor wont increase your revs .going down a pitch size on your prop will..when travelling go back and check if your new foil is sitting on top of the water or going thru it...rick The new hydrofoil is running just under the water (for some reason I can't load the video I have taken) about maybe 1 inch or so. Link to comment Share on other sites More sharing options...
shakey55 Posted February 2, 2017 Author Share Posted February 2, 2017 3 minutes ago, noelm said: Lifting a motor that is too low, will raise RPM, what was it like before the foil? Hi noelm the addition of the hydrofoil has not really changed the RPM's (maybe a slight reduction if anything). im not overly concerned, but I'm lead to believe that the motor should be set up so the cavitation plate is level with top of water when trimmed out. My cavitation plate (now with foil attached) is running about 1 inch or so below the water. This is an interesting article I just found http://www.boats.com/how-to/the-outboard-expert-boost-speed-with-outboard-engine-height-adjustments/ Link to comment Share on other sites More sharing options...
The Incredible Hull Posted February 2, 2017 Share Posted February 2, 2017 Hey Shakey, I also just purchased the SE SPORT 400 (recommended by Stewy in an older post). Mine came with the normal circular half indented thingy that sits on the bottom, but it also came with a round rubber washer too. Are we supposed to fit this too? I was unclear on the youtube video they have for this installation. Dave. Link to comment Share on other sites More sharing options...
shakey55 Posted February 2, 2017 Author Share Posted February 2, 2017 1 hour ago, The Incredible Hull said: Hey Shakey, I also just purchased the SE SPORT 400 (recommended by Stewy in an older post). Mine came with the normal circular half indented thingy that sits on the bottom, but it also came with a round rubber washer too. Are we supposed to fit this too? I was unclear on the youtube video they have for this installation. Dave. Hi Dave Put the bolts through (thread underneath) then the rubber washer, then the plastic disc and tighten nut. I'll look over weekend and see if I still have instructions. If your still unsure let me know and I'll type out detailed instructions from memory. It's easy Link to comment Share on other sites More sharing options...
rickmarlin62 Posted February 2, 2017 Share Posted February 2, 2017 if the cav plates under water you will have to lift motor definitely Link to comment Share on other sites More sharing options...
rickmarlin62 Posted February 2, 2017 Share Posted February 2, 2017 what pitch prop are you running ?? Link to comment Share on other sites More sharing options...
frankS Posted February 2, 2017 Share Posted February 2, 2017 Check your prop size and let me know. I may be able to lend you a smaller pitch prop, no promises but IF I have , you can borrow for a couple of weeks to test it properly in different conditions. Frank Link to comment Share on other sites More sharing options...
shakey55 Posted February 3, 2017 Author Share Posted February 3, 2017 Don't get me wrong fellas, I'm not unhappy with performance, I just think that the cavitation plate should be running higher and I could get a little more out of her I'm going to raise it one or two holes and see what happens, but not in a position to do this until end of March as I'm going on a couple of trips between now and then. Ill check prop prop size over the weekend Link to comment Share on other sites More sharing options...
BWV Posted February 3, 2017 Share Posted February 3, 2017 Ok guys, it's a antiventilation plate, not a cavitation plate! Your AV plate should only be getting splashed when running, not in the water. Your engine rpm's will increase as height is increased, as drag is reduced, therefore load is reduced allowing the engine to operate with less load and more efficiency. You want your RPM's 200rpm off the manufacturers stated maximum rpm, eg if max is 6000rpm you want 5800rpm loaded. This will give you the best all round proformance and longevity of your outboard. If you feel the need to bolt any foils, permatrims etc to your outboard something else is wrong. They only hide the symptoms of other problems and increase drag. This topic has been done to death on all forums but there is so much wrong information out there because a friend of a friend said to do this or that, be careful which info you choose to run with because you'll end up in trouble. FYI, every outboard powered boat I have owned I have lifted the engine and on all of my friends boats we have lifted the engines. They are all mounted low. Link to comment Share on other sites More sharing options...
Raymondo Posted February 3, 2017 Share Posted February 3, 2017 2 hours ago, BWV said: If you feel the need to bolt any foils, permatrims etc to your outboard something else is wrong. They only hide the symptoms of other problems and increase drag. Agreed. Link to comment Share on other sites More sharing options...
The Incredible Hull Posted February 3, 2017 Share Posted February 3, 2017 On 02/02/2017 at 10:09 PM, shakey55 said: Hi Dave Put the bolts through (thread underneath) then the rubber washer, then the plastic disc and tighten nut. I'll look over weekend and see if I still have instructions. If your still unsure let me know and I'll type out detailed instructions from memory. It's easy Ah right... I didn't fit the rubber washer and I took the boat out to longy today, lucky it didnt come off! Will put the rubber washers on the weekend thanks mate. FYI so many baby kings outside, we were pulling up 45cm-60cm kings, such a disappointing day after spending so much effort to get live squid. Link to comment Share on other sites More sharing options...
Fishop Posted October 20, 2017 Share Posted October 20, 2017 I know this topic has been flogged but what is everyones opinion on my motor height? Could it go a hole or two higher? The AV plate is approx 40mm below the bottom of the hull. The upper plate is about 20mm above the bottom. Still have 3 holes I can go up. Also does anyone know what brand of hydrofoil I have? Cannot find any markings or labels on it anywhere. Link to comment Share on other sites More sharing options...
rickmarlin62 Posted October 20, 2017 Share Posted October 20, 2017 its definitely too low foil looks likehydro sports being curved..i just took one off my 90hp and picked up 3knots..rick Link to comment Share on other sites More sharing options...
Fishop Posted October 20, 2017 Share Posted October 20, 2017 Thanks yeah thought as much. Should I go up one or two holes? Or three? Lol Link to comment Share on other sites More sharing options...
rickmarlin62 Posted October 20, 2017 Share Posted October 20, 2017 looks like three would get the bottom plate level with hull...rick Link to comment Share on other sites More sharing options...
Nolongeramember Posted October 20, 2017 Share Posted October 20, 2017 I’m no expert but I know the plate where you have the foil should be about level with the water or just under when at speed. For best performace go as high as you can without getting cavitation (I think it’s called when the prop slips in the water) when turning. Link to comment Share on other sites More sharing options...
Fishop Posted October 21, 2017 Share Posted October 21, 2017 Cool yeah went for a run yesterday and has the missus take the wheel at cruising speed and the plate is set underwater couldn't even see a dark shadow of where it might be underwater so it needs to come up a bit. I'll post back on how it goes after I move it. (Going OS so might be a month or two) Link to comment Share on other sites More sharing options...
Fishop Posted December 9, 2017 Share Posted December 9, 2017 So finally had the engine serviced and raised to the highest setting. Still looks a tad low but can't go any higher. Boat now planes at around 16-17 knots and 3900-4000rpm which is a few knots slower and a couple hundred rpm lower which is good. Getting sprays from the holes that are drilled in the upper ventilation plate. Is this going to hurt anything? Water shouldn't be able to spray up into the engine should it? This was still trimmed in as it was a bit choppy out. The sprays go away when trimmed out. videocompress-045-20171209_102000.mp4 Link to comment Share on other sites More sharing options...
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