91 celebrity first splash, issues??

MikDee

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I'll look at some TACHS. My main objective here is to figure out why I can't run wot at 4,400-4,600 rpm's with a 19p prop and hit the projected 50-55mph. Like it seems I should be able to.

It's seems there's not much wrong with your motor, but you can't unwind your motor with the wrong prop. That's why I posted the MercuryMarine prop chart. Even one of the most reasonable Black Max Alum is probably better then yours. Or, just get a Merc. Spitfire 4 blade in 19 pitch as an alternate for water sports, and see how that works out for you?
 
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NHGuy

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Mik, is his boat heavy enough to benefit from a 4 blade? Seems logical. But what do I know, I'm your classic "bench racer"
 

MikDee

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Mik, is his boat heavy enough to benefit from a 4 blade? Seems logical. But what do I know, I'm your classic "bench racer"

I would say yes, it is around 4000lbs from what he said with, the fuel, & load combo.
Maybe I'm just spinning my wheels here, but watching his timing video it looks like a sporadic spark. Maybe he needs a new Distributor sensor?
 

stonyloam

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I read as much as I could stand. It is pretty obvious to me that you don't know the boat well enough yet to know what the heck is going on. You need to get out and run it, and find out how to trim it for maximum performance. Your RPM and speed will vary significantly with trim. As you trim up and down you will see RPM and speed changes, and those changes take time to show. Try this, trim er out flat till you get up on plane , trim up slowly, watch the tach and let the engine settle in. Trim up till you just start to purpose then back down a little. Should be able to find your "sweet spot trim", and then you can work on optimizing your performance. Just IMHO ;)
 

NHGuy

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Mik, I wouldn't place complete faith in your failed timing flash thought unless the OP does. There is a very good chance that the frame rate of the record device may not be synced to the engine speed, plus we are playing it remotely. I wonder how & if it was processed. Kinda like watching wheel spokes on movies and TV,
 
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voodoochikin

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WHAT!!!??? What's trim?? Stony--- I'm not stupid. I know exactly where the sweet spot in my trim is and I know how to use the trim. In the sweet spot on wot...I hit 4,100rpms. And 45mph on GPS. Any trim higher and it loses speed and ventilates or cavitates or whatever.. A tad lower trim and it loses speed. So I do know how to use thetrim. If you did actually read back you wouwould of seen where I just had to repeat that.
 

voodoochikin

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I've been using the boat a number of times. I'm 100% convinced the qjet is the issue. Based on many things mostly to do with starting, idling, hot starting.
 

voodoochikin

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Nhguy-- I'm 99% sure in person that skipping of the timing was not occurring. Engine is smooth. I'll post another video of us pulling a tube and you can really hear the engine good under load. Also- yea I get this thread has ran on many pages here. But its all in good conversation and discussion. Hopefully it doesn't appear that I'm clueless and just going around and around here because that's not how it is. I'm checking things. Making changes. Testing and so forth. I'll be aquiring a new 19p prop from one on the list here asap. I do really appreciate the help though. Also let me state that I've been enveloped in engine be it cars, motorcycles, and pretty much all things engine related my entire life.. So I'm not a dummy. Just looking for useful advice. Thanks!!
 

MikDee

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VC, We're all only trying to help, when people post we have no idea how skilled or how much experience they have? I'm sure we all get it that you're much more then a newbie ;) I came across this link today, and don't know if it pertains, but maybe something to note: http://www.boatfix.com/merc/bullet/99/99_04.PDF
 

stonyloam

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Did not mean to offend but it was just too much to follow, the new prop sounds like a great idea. Good luck.
 

MikDee

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Lookin Good! But, IMO, you're pulling that tube way to fast! Someone could get hurt bad. I believe the suggested speed limit for tubes, or water toys like that is 25mph. Skiing is a different story.
 
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MikDee

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I think your speedometer is faulty, that looks like at least 30mph? The boat with 4 people in it is actually flying (leaving the water) at times :eek:
 

voodoochikin

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2 adults in the tube.. 3 adults in the boat. No joke I never went above 20mph. +/- a few mph. But I can't speak for the tube as it went around side to side. The tube was bouncing off the surface when we were doing 15. But anyways. The girls had a blast, they didn't feel in danger and wanted to go faster. I feel I'm a responsible safe boater :) .....FYI I'm cleaning the scale off my prop and gonna polish it. Also scoping out a black max merc prop. Same pitch as current. Also looking at a reman carb on eBay. $280 isn't bad.
 

voodoochikin

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Update: From what I can tell, it appears the previous owner tried cleaning the scale off the prop with a sanding disc which I noticed the marks as previously mentioned. What happened then is the prop was roughed up allowing a nice thick layer of lake scale to build up on the now porous surface. Im getting cleaned off and then will polish the prop. I still have the black max prop in my cart. I ordered a new Teleflex coil specific to my year engine, because everything else appears to be somewhat new. The cap, rotor, plug wires, plugs and so forth all look good but the coil looks old. Im still debating replacing the ignition module just so I know its new.

Also when we had it in the water last, It was idling at the dock for a few minutes. I reversed away from the dock and then put it into drive. It died instantly as if someone cut power to it. I cranked and cranked for what seemed like ever and it would not fire. You could smell fuel like crazy so we moved the dog house and it stank of gas terribly. Eventually I got it started by holding the choke open (wasn't warm enough to be fully open yet)... and holding the throttle wide open I got it to fire up... I then noticed the throttle shafts had some pretty good wiggle and im pretty sure this carb is worn out. Also I kept having to adjust the idle speed which makes me feel it has a vacuum leak around the throttle shaft.
 
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MikDee

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Glad to see you're working all the issues out! Yeah, that carb seems way worn out! By the way here's a couple pix of props, check out the design of the Black Max 14"X 21", the Merc Spitfire 4 blade has a similar sleek speed design.
 

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