91 celebrity first splash, issues??

[voodoochikin]

Check out this hog. I didn't touch it with anything other that soaking it in some commercial lime and calcium cleaner...it dissolved the scale right off it. Noticed all the sanding marks.

 

[MikDee]

I don't think polishing it is gonna help much? It is a generic "elephant ear" design. More for power, then speed. The trick with SS props is their strong thin blades, that don't flex much compared to aluminum. Their rigid design, gives you the most grip on the water at all times.

By the way can you see my prop pix? I can, but I never know if it's gonna appear here for others to see?

 

[voodoochikin]

Yup I can see them. I have a merc black max 19p ready to buy. But it looks like the same blade design to me. Maybe they use some generic stock picture.

 

[voodoochikin]

Edit: I mean my prop looks the same design as the picture for my black max prop in looking to buy. Not your pic.

 

[MikDee]

One more thing, if you're going to an aluminum prop,(they're easier to spin) IMO, you might need a 21 pitch prop. Or you might overrev! Judging by my old 20' SeaRay bowrider 5.0 with a 19" pitch Black Max, I could get close to 5000rpm with that, and you have a much more powerful later model 5.7
I just don't want you to have go thru a prop exchange?

 

[voodoochikin]

Maybe im beating a dead horse? but if I can barely clear 4,000rpms NOW... why would I over rev going to a same pitch aluminum prop? Barring that the prop isn't the reason why I cant reach 4,600rpms... id like to correct that issue first then switch props... I think. lol.

 

[MikDee]

Just a heads up buddy, no bad intent meant, I just know you'll probably see a rise in rpm's just by going to an Alum prop.

 

[voodoochikin]

Not at all... no bad intent taken at all Im just curious is all. Im gonna replace the coil for piece of mind. and replace the carb with a reman from ebay since im pretty certain this one is worn out.

 

[bruceb58]

I just know you'll probably see a rise in rpm's just by going to an Alum prop.

You have that backwards. A SS prop will always have higher RPMS given prop pitch and propeller shape is identical. Reason for this is the SS will have thinner blades with less drag.

The problem of course is one brand or model prop to the next will likely have a completely different shape and cup even with identical pitch.

 

[achris]

One more thing, if you're going to an aluminum prop,(they're easier to spin) IMO, you might need a 21 pitch prop. Or you might overrev! Judging by my old 20' SeaRay bowrider 5.0 with a 19" pitch Black Max, I could get close to 5000rpm with that, and you have a much more powerful later model 5.7
I just don't want you to have go thru a prop exchange?

???? An aluminium prop of x pitch will create the same load as a stainless steel prop of the same pitch.... Your 5 litre will have had a different drive ratio, so you are not comparing apples with apples....

How does an aluminium prop spin easier? Again, if the props are the same style, pitch and diameter, they will spin the same..

Mik, you have next to no knowledge in this area (and that's obvious by the posts) and are sending threads in the wrong direction. With a 19" prop it only makes 4100.. Putting a 21" on will REDUCE that... The only way to get up in the 'over-rev' range would be to put a 15" on...

OP... Just catching up on the thread. How well does the boat accelerate? If it's slow out of the hole and has difficulty maintaining plane, then the prop is too big. Se if you can borrow a prop of a smaller pitch and see how that goes. All this assumes the engine is in good working order and proper tune. Have you at least checked the compressions?

Chris......

 

[MikDee]

You have that backwards. A SS prop will always have higher RPMS given prop pitch and propeller shape is identical. Reason for this is the SS will have thinner blades with less drag.

The problem of course is one brand or model prop to the next will likely have a completely different shape and cup even with identical pitch.

Whatever! I got that, it's usually the norm, but I was referring to his stock prop, compared to a Black Max IMO

 

[achris]

Whatever! I got that, it's usually the norm, but I was referring to his stock prop, compared to a Black Max IMO

Again, talking about things you know little about... The Black Max prop IS the stock prop!!!

 

[voodoochikin]

I have not yet checked compression. Im very confident this carb is most of the issue not being able to rise above 4,100rpms. The motor sounds good otherwise and sounds very strong. The boat accelerates well and gets on plane quickly, also maintains plane fine as I can tell. AND maybe im chasing my tail here, but I feel like I should be able to run higher than 4100rpms in stock form. I cant believe that its running to full potential, but maybe it is and maybe this is just how its supposed to be. I guess ill know when I swap the carb and check the comp. I don't want to drop to a 17pitch prop because while my rpms will go up, ill still be topping out at 45mph or so.

 

[MikDee]

Again, talking about things you know little about... The Black Max prop IS the stock prop!!!

Reread the thread again Chris, you're wrong his prop is a Michigan Wheel SS

 

[voodoochikin]

I don't think this SS Michigan was not the factory prop on the boat though.. I think chris meant the black max was the stock prop that came on this boat new.

 

[bruceb58]

I don't think this SS Michigan was not the factory prop on the boat though.. I think chris meant the black max was the stock prop that came on this boat new.

That's what I thought Chris meant as well.

The prop is the exact last thing you need to be fooling with. You need to verify timing, compression, your fuel system is operating properly and engine is in tune. All things Chris said. Then you mess with the prop.

 

[voodoochikin]

That's the plan of attack. Thanks guys!!

 

[MikDee]

Hey V.C. hows it going, anything new with the boat? Or have you picked up another prop recently? Keep in touch.

 

[voodoochikin]

UPDATE: I ordered a new coil as the one on the boat looked original while most other items were obviously replaced recently. Here is a picture of the old coil, nasty. Also had to buy a larger vehicle as the blazer was not gonna cut it to pull this hog down the highway. It did it, but struggled. Found this one owner 2002 Tahoe that's in excellent shape with a towing package. It works great pulling this boat. ALSO... there is my westlands exact fit sunbrella cover. Very impressed with it so far. Its the perfect length, could have been a little wider in some spots. Also some reinforcements could have been added in spots, but overall its a great cover with nice straps and it trailers excellently!!

With the new coil installed, the boat felt like it ran better and harder. On some good chop I was able to trim it to about 4,400rpms and get 48mph. But I also verified that this carb is trashed. There is massive vacuum leaks around the throttle shafts and im constantly adjusting the idle. Got a reman unit ordered on ebay and it will be here this week. I don't know if its a placebo or not, but it felt like there was less drag on the boat with that prop being cleaned and smooth now. IDK.

 

[MikDee]

Glad to hear from you V.C. It all sounds good! Not a placebo effect, anything you can do to make the boat more efficient is gonna help. That coil looked toasted. Love the boat, and cover in Teal, and the Tahoe especially in gunmetal. Boy I wish I was you! Please post back when you get your carb issues sorted out. Have you tried any Mobil 1 synthetic oil yet? later, Mike