200HP RPM & prop

[ondarvr]

I have a 1997 Blue Wave 189 Classic (19' cc , bay boat) I took the motor off and put it on my jet boat a couple of years ago. I have a 1976 200HP Evinrude on it now. I know the boats rated for a new 150, but it's what I have. So far the speeds I've gotten are well below what Yamaha lists on this hull with their 115 and 150 HP 2 strokes (48 and 54 I think).<br /><br />Motor Info<br />model #200649 1976<br />De carbed<br />fresh gas each day<br />new t-stats<br />new OMC coils<br />new plugs QL77J4C .040<br /><br />COMP <br />2 115, 1 110<br />4 115, 3 108<br />6 110, 5 108<br />new head on port side #323456 other side #320644<br /><br />color of plugs after last test. 1,3,4 and 5 were light tan (maybe too light?). 2 and 6 were a little darker.<br /><br />Idle is a little rough, 650 to 700<br /><br />Tach, new Teleflex, set on 6<br /><br />I will clean the carbs again, now that its' been run for awhile. <br /><br />motor is mounted as low as possible for this hull. Transom has a 6" cutout (step) at the hull, motor is 12.5" back from cutout. AV plate is 1.75" (2.75" above lowest area outside of tunnel))above the tunnel, flat area at keel is 12" wide, with a 6" wide, 1" deep rounded tunnel in it. Not a tunnel hull, just a small tunnel at the keel.<br /><br />boat 1,300 lbs, 8 gallons of fuel, one person.<br />rolled on bottom paint, it was done befoer I got it.<br /><br />Put the motor on last week.<br />with a 15x17 OMC (AL) prop it was at 5,100 RPM trimmed up. With a 14.25x21 (AL Mich) it was 4,400.<br />It had a miss, checked the coils, 4 were cracked, changed to normal plugs.<br /><br />Now with 15x17 it was 5,400 at 44MPH (Garmin 240 with paddle wheel, first run with this unit so it may not be accurate). with the 14.25X21 it was 4,700 at 42 mph.<br /><br />Hole shot was no problem with either prop, although unless trimmed down alot the prop would blow out very easy, it did the same thing with the original motor.<br /><br />motor is very clean, little or no corrosion under the hood. When I changed the t-stats there was no build up inside, pretty clean. Looks like it may have been rebuilt and then not used much.<br /><br />I didn't have my temp gun with me, but it seemed OK, I will next time.<br /><br />I am not looking for speed, but it seems it should go a little faster, but I have no experiance with older V6s. I just want it set up correctly so it will last for awhile.<br /><br />Thanks, you guys always supply great information.

 

[moderator1]

Re: 200HP RPM & prop

I'm not real up on tunnel-hulls, but I can tell you that engine should swing atleast a 21P with no problem, at nearly 5700RPM on a boat in that weight range, designed for speed.<br />15X17 is what we use on a 23ft whaler with the same engine, and it'll turn 5500.<br />The gent you need to speak with is Dhadley...he has raced alot of different boats and knows these engines well. He'll understand your set-up too. Good luck!

 

[walleyehed]

Re: 200HP RPM & prop

Sounds to me like something else is up...I can't say I know the hull but it should spin more prop than a 17P at a much higher RPM...as mod1 said, maybe Dhadley can give some insight...

 

[ondarvr]

Re: 200HP RPM & prop

Dhadley, after reading your posts on <br />Jan Yahr's "MAX RPM ON CENTER CONSOLE" it appears our #s are very close. Are we looking at the same problem?

 

[ddaigle]

Re: 200HP RPM & prop

You also have to realize its a tunnel hull bay boat and they are very difficult to push over about 45 mph. The tunnel creates a lot of speed robbing problems. Great for shallow water but not high speed. I live in the land of tunnel hull boats, S. Padre Island, only a few of the newer tunnels push 50 mph or more.

 

[ondarvr]

Re: 200HP RPM & prop

ddaigle<br /><br />This isn't the Blue Wave tunnel hull model, I know there were many issues getting them set up. this is just their normal hull. It has a small shallow tunnel. 6" wide, 1" deep, extends about 3/4 of the way up the hull.<br /><br />Thanks

 

[ddaigle]

Re: 200HP RPM & prop

My mistake, saw tunnel in your post and didn't pay enough attention to rest of post.

 

[Dhadley]

Re: 200HP RPM & prop

Yeah, its amazing how similar they are. Those blocks were pretty rare, thats why I was so reluctlant to mention it but he exhausted everything else I could think of. <br /><br />What was the motor you took off this boat? What rpm did it turn?

 

[ondarvr]

Re: 200HP RPM & prop

It came from Blue Wave with a 1997 90hp SPL 90 degree mounted in the same holes. prop 13 7/8 x 15. It didn't have a working Tach, bad batch of system check units, by the time I got a new tach it was on my jet boat. I was very pleased with performance of the 90, speed was not that important (what did I just say?). This motor looked to be in great condition for it's age, and the cost was almost nothing, so it looked like a good candidate.

 

[Dhadley]

Re: 200HP RPM & prop

The boats not "nosing over" is it?

 

[ondarvr]

Re: 200HP RPM & prop

No, the hull is flat, checked it with a straight edge.

 

[Dhadley]

Re: 200HP RPM & prop

I mean when youre running at a cruise speed and then open it up. Does it feel like you trimmed the motor in?

 

[ondarvr]

Re: 200HP RPM & prop

No, seems OK, just doesn't reach expected speed or RPM.

 

[ondarvr]

Re: 200HP RPM & prop

One other thing, I did notice that after the first couple of times I ran the motor there was a dark fuel and oil mix that would run down the front of the mid section. leaky gasket at base of power head maybe? I just checked and there was very little now, seems like the more I run it the less it happens.

 

[Dhadley]

Re: 200HP RPM & prop

That could be a base gasket or a cracked adaptor housing. It wont hurt anything in either case. Just ugly.<br /><br />What I mean by "nosing over" is when youre on a nice easy cruise and the spray is breaking from -- lets just guess and say -- even with the back of the console (or where ever) and then you throttle down without moving the trim. Does the spray breaking point (on the side of the hull) move forward or back?

 

[ondarvr]

Re: 200HP RPM & prop

It seems to run pretty flat at all speeds, if it did nose over it wasn't enough for me to notice without actually looking for it. These hulls have very little deadrise at the transom, wide and fairly flat. I have never seen another one of these boats on the water at speed. I live in Seattle and most of them are sold and used in Texas. I have only seen pictures of them on a plane, none of them had any bow lift, they ran very flat with alot of the hull in the water. I will check it on the water again a soon as I get the carbs back on, they were very clean. I am headed out to get all new fuel lines. <br /><br />Thanks

 

[ondarvr]

Re: 200HP RPM & prop

Went back out for testing. Carbs were still very clean, starts easy, warm or cold, idles OK at 650 to 700. After it warmed up and I made a couple of runs, I pulled off each plug wire at an idle, each cylinder was the same, just a very slight drop in RPM.<br />I then did the same thing and took it to WOT to see if one cylinder was not pulling it's fair share under load at high RPMs. with all 6 connected it was 5,400, it was 5,000 +/-50 as a 5 cylinder (prop 15x17). I don't know if this is a recomended test. <br /><br />The Seloc manual says the timing should be at 28, the sticker on the motor says 26. You know these motors, what's your opinion.<br /><br />It was not nosing over, the spray moved back slightly as the speed increased.<br /><br />It cruises very well at 3,500 to 4,500 and I have no need to go any faster. Should I stop testing and go fishing, or is there somthing else going on here?<br /><br />And I thank again for your help.

 

[ondarvr]

Re: 200HP RPM & prop

I pulled off the exhaust cover and heads. <br />No blowby everything is clean, pistons look good.

 

[ondarvr]

Re: 200HP RPM & prop

It took a couple of weeks to get one of the gaskets, so I just got it back together. Starts warm or cold no problem, idles OK. The Seloc manual says the timing should be at 28 BTDC, the sticker on the motor says 26. An old OMC mechanic told me to check the timing by disconecting the spark advance arm and moving it to the WOT stop while the motor is running. It was set at 26 by this test, but is this accurate? No load, no throttle advance, not at 5,000 RPM. I also raised the motor one hole, gained about 100 RPM, now 5,500 with the 15x17.