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#31
09-14-2011, 08:15 AM
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Re: 1973 20' CC Transom woes
FINALLY, getting the boat back in the water to check new scupper repair...also to re-evaluate anti-cav plate height.
Another question: I will be installing the Hydro-Shield. Does this change the suggestion that I raise the motor 2 holes, to put the AC plate at 1 1/2" inches about the keel level (Currently AC plate is level with keel...I can't see it while on plane with moderate load). I need to get this right, as I don't have access to easily play with motor height. 73 20' CC, 150 OptiMax (HEAVY), 2 batteries in front of the console, rear baitwell. Thanks again, folks.
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1971 20' Seafari, 3.0 Merc. I/O Peterson 1819 Aluminum single axle trailer 
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#32
10-02-2011, 12:20 PM
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My, how time flies. My schedule and weather just haven't permitted moving forward at a faster pace.
It took some doing, but the tech that I asked to raise the motor kept refusing, as he is afraid I'll bring the boat back to him with an over-heated engine. He couldn't have been more clear with his protestations, and I imagine I'll get an earful when I see him tomorrow. He was reluctant to believe what I have read here, from devoted SC owners. So, he finally raised the engine (needed to drill 4 new holes, and fill the old ones) so that the anti-cav plate should now be 1 1/2" above the level of the keel (I'll see it for the first time tomorrow, weather permitting). I'm running a 2008 OptiMax 2-stroke, prop is 15 1/2" , 17P, Mirage Plus, getting 5200rpm at WOT, moderate load. What should I look/listen for during this shake-down cruise? I know the 2008 150hp OptiMax has overheat protection (buzzer, automatic throttle reduction), but I'm just wondering if there's anything else negative to look out for? Might it cavitate more on hard turns, and is occasional cavitation normal when plowing through wake while turning? I'm fully expecting quicker hole-shot, and more level WOT planing, with less lateral spray from the motor. Should I also expect higher top-end speed (currently around 41mph) and higher revs from the engine, as well? Thanks agains for the help. I hope I've not come off as an insufferable newbie with all my questions.
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1971 20' Seafari, 3.0 Merc. I/O Peterson 1819 Aluminum single axle trailer Last edited by pianewman; 10-02-2011 at 12:26 PM.
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#33
10-02-2011, 01:18 PM
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Do you have a water pressure gage installed? It might give you some warning of cooling water supply issues before it overheats.
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'72 SeaFari/150E-Tec/Hermco Bracket, owned since 1975. http://i188.photobucket.com/albums/z...Part2019-1.jpg
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#34
10-02-2011, 10:44 PM
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Hey Pianewman-
I finally got to look at my setup this weekend in action. With the Yamaha F100 and the size large hydroshield and a full boat (3 guys, 3 tackle boxes, a kicker, kicker fuel tank), it looks like the anti-cav plate was in fact about 0 inches above the keel, running basically dry at about 31 MPH with minimal lateral spray off the lower unit. No tape measure involved, as I was leaning over the transom at WOT. I also have the two batteries in the center console, along with a 20 gallon topside tank. I have flotation foam where the under deck tank was. Again, with the noticeable stern lift at WOT from (I suppose) the hydroshield and 4 blade stern lifting 12-3/4 x 17P prop. A hat tip to Fr. Frank for the suggestions on my setup. Quote:
Last edited by FishStretcher; 10-09-2011 at 12:26 AM. Reason: wrong about anti-cav plate height- see later in the thread for pix
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#35
10-03-2011, 07:17 AM
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I agree that Fr. Frank deserves a "tip of the hat". He's gently told me what to do, over and over...I've got my dad speaking into my other ear, though, and his mid-west stubborness is slowing me down..
FishStretcher...where is your anti-cav plate when at rest, motor all the way in? What's the width of your large Hydro-Shield? I was told they don't make it anymore, and Fr. Frank recommended the medium anyway, because he thinks the large flexes too much? Any cavitation with directional changes at WOT? I would think ACplate OUT of the water 1 1/2" might create some cooling issues? Rained out today...upper 40s f...I'm a wimp...fishing should be fun...
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1971 20' Seafari, 3.0 Merc. I/O Peterson 1819 Aluminum single axle trailer
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#36
10-03-2011, 01:18 PM
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The 1 1/2" is correct especially with that prop, I would not put that whatever on in any case but especially before running the boat without it. Can't figure out why the holes had to filled and re-drilled ? should have just raised the motor put the bolts back in
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Any way you measure it - dumbass is expensive
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#38
10-03-2011, 08:42 PM
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No WOT handling issues, it carves turns as hard as I am comfortable with. No cavitation, and 2 weeks ago ran at absolute WOT for ~11 miles at a time (20 minutes) with no high temp alarm. Twice.
I will look for a picture of the anti-cav plate positioning. I might have a picture in my phone. How much does the 150 weigh compared to my F100 and kicker. Remember, I am lifting ~428 lbs on the stern when I include the kicker. Quote:
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#39
10-03-2011, 09:15 PM
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The OptiMax is around 460, I believe, so I've got you beat, weightwise. I might have a full baitwell, as well, but I've not done that yet.
I trust if the engine gets too hot at WOT, I'll be able to hear the warning buzzer...I'll certainly notice the throttle cutting back! Looks like I'll finally get it back in the water this weekend. I can hardly wait...
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1971 20' Seafari, 3.0 Merc. I/O Peterson 1819 Aluminum single axle trailer
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#40
10-08-2011, 05:25 PM
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OK, I finally got a picture of my setup on land
Anyways, maybe my anticav plate is lower than I thought? I may raise it one hole this weekend. Quote:
Last edited by FishStretcher; 10-08-2011 at 05:32 PM.
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