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Old 08-09-2012, 06:20 PM
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Arrow 22' century hard to get up on plane, carb issues or spun prop?

ok finally got my boat in the water today, its a 1991 century 22' speed boat, has merc 5.7 alpha one out drive, the engine is brand new, the carb is a reman and new, new fuel pump, new ecell ignition coil, new drive hub, basically everything is new on the enigne and outdriveand boat complete over haul, my issue is when i try to get up on plane the front of the boat comes up and engine seems to be struggling like its over loaded and is chewing up the water behind the boat, i was trimmed all the way down and made sure it was, i did get it up on plane 2 times and then trimmed the out drive out and she ripped did about 60mph which was my guess cus the speedo wasnt working and held 4200rpm and had more throttle in her, now when iam on dry land with the boat on the trailer engine revs up fine, goes into gear ok, put brand new 93octane fuel in it today, also the prop is a quicksilver stainless 19 pitch,i think is has a prop issue or carb issues, any help is appciated thanks matt
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Old 08-10-2012, 09:11 AM
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also i had one of my buddys crawl up into the bow of the cuddy and it seemed to help the boat a little to get on plane,
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Old 08-10-2012, 09:13 AM
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Maybe you're over-propped..??
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Old 08-10-2012, 09:45 AM
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If your prop clears the water with the engine trimmed up...mark the outside of the prop body with white paint and some point along the hub, either the nut or the shaft so its all in a line...if the marks move you spun your hub...you might have to remove the prop to paint of you don't clear the waterline
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Old 08-10-2012, 09:59 AM
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If your prop clears the water with the engine trimmed up...mark the outside of the prop body with white paint and some point along the hub, either the nut or the shaft so its all in a line...if the marks move you spun your hub...you might have to remove the prop to paint of you don't clear the waterline
iam gunna try that, but iam almost positive its either a prop issue or carb issue jus gotta play around with sum stuff
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Old 08-10-2012, 10:18 AM
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Default Is this a new problem?

Is this a new problem or is this the way the boat has always performed?

If a new problem, then I would offer up some possibilities.
Carb Issue.
Fuel pump issue
clogged fuel filter.

If not a new problem
Carb Issue.
Timing issue (timing is not advancing)
Fuel pump issue
clogged fuel filter.
wrong prop.
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Old 08-10-2012, 10:28 AM
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I agree with cfauvel, need to trouble shoot the motor. If the prop was spun you would over rev, kind of like transmission or clutch slipping in a car.

Since you have a lot of new ignition parts already, I would check the dist and make sure the centrifical advance is working. They get gummed/rusted up.
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Old 08-10-2012, 10:40 AM
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it has a new cap/ rotor plugs wires, i set the timing 10-12* btdc. not sure if its advancing, but this was the first time i have ever had this boat in the water so yes its a new problem, fuel filter is new fuel pump is new, fuel lines are new, ya i dont thing the prop is spun iam starting to lean towards a carb or ignition problem, iam gunna try and look into it tommorw, but like i said when i finally got up on plane she hauled sum serious ass.
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Old 08-10-2012, 11:19 AM
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"my issue is when i try to get up on plane the front of the boat comes up and engine seems to be struggling like its over loaded and is chewing up the water behind the boat"

When your trying to get up on plane and its chewing up the water, what RPM are you turning?
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Old 08-10-2012, 11:40 AM
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Default Hmm

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Originally Posted by monte383sbc View Post
it has a new cap/ rotor plugs wires, i set the timing 10-12* btdc. not sure if its advancing, but this was the first time i have ever had this boat in the water so yes its a new problem, fuel filter is new fuel pump is new, fuel lines are new, ya i dont thing the prop is spun iam starting to lean towards a carb or ignition problem, iam gunna try and look into it tommorw, but like i said when i finally got up on plane she hauled sum serious ass.
What engine is a merc 5.7 is it a chevy or ford?
Take the rotor and cap off and the points/condenser plate and see if the mechanical advance is free moving. If these get stuck your engine will run like a dog. Do you have vacuum advance too? You can test that by running the engine, plugging the tube where the hose went to at the carb and sucking on the hose while the hose is still connected to the dist. You should hear the motor speed up if the vacuum advance is working.
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Old 08-10-2012, 11:50 AM
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Originally Posted by ken2 View Post
"my issue is when i try to get up on plane the front of the boat comes up and engine seems to be struggling like its over loaded and is chewing up the water behind the boat"

When your trying to get up on plane and its chewing up the water, what RPM are you turning?
not sure didnt even look at the tach, the engine didnt sound anymore the 3k rpms
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Old 08-10-2012, 11:54 AM
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What engine is a merc 5.7 is it a chevy or ford?
Take the rotor and cap off and the points/condenser plate and see if the mechanical advance is free moving. If these get stuck your engine will run like a dog. Do you have vacuum advance too? You can test that by running the engine, plugging the tube where the hose went to at the carb and sucking on the hose while the hose is still connected to the dist. You should hear the motor speed up if the vacuum advance is working.
the engine is a small block chevy 355, its got built head and a comp marine cam, nice heathly eagle bottom end, cast iron gm performance intake and a rebuilt quaddrajet carb, the igniton is a thunderbolt distributer, has no vacume advance
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Old 08-10-2012, 12:08 PM
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Well, if your only turning 2500-3000 RPM and its slowly crawling on plane, then you either have motor issues. or your over propped.
(19 pitch is not a very high pitch though)

If your turning 3000+ and its not getting on plane, then you have plenty of power but no traction. Which would mean the prop is slipping, that can be the hub, or just the prop not getting the traction it needs to get up on plane.

From what I looked up, there were two gear ratio's on the alpha 1 drives that year.
The 240 HP "Magnum" 350 5.7 L had a 1.5 gear ratio
the 260 HP 5.7L had a 1.65 gear ratio.

Either way, you'd have to be turning a lot of rpm to hit 60 MPH.
the fastest you'd go with a 19 pitch prop would be about 48 MPH at 4200 RPM.

What specific Quicksilver prop do you have?
Should be a 4 digit number on the side of the prop.

Would be helpful to know the actual speed, that will tell us a lot.
because if you were actually going 55+ MPH at 4200 RPM, then you are very likely overpropped. It would take at least a 22 pitch prop to run 55 MPH at 4200 RPM.
Maybe that prop has been modified or something
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Old 08-10-2012, 06:59 PM
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Well, if your only turning 2500-3000 RPM and its slowly crawling on plane, then you either have motor issues. or your over propped.
(19 pitch is not a very high pitch though)

If your turning 3000+ and its not getting on plane, then you have plenty of power but no traction. Which would mean the prop is slipping, that can be the hub, or just the prop not getting the traction it needs to get up on plane.

From what I looked up, there were two gear ratio's on the alpha 1 drives that year.
The 240 HP "Magnum" 350 5.7 L had a 1.5 gear ratio
the 260 HP 5.7L had a 1.65 gear ratio.

Either way, you'd have to be turning a lot of rpm to hit 60 MPH.
the fastest you'd go with a 19 pitch prop would be about 48 MPH at 4200 RPM.

What specific Quicksilver prop do you have?
Should be a 4 digit number on the side of the prop.

Would be helpful to know the actual speed, that will tell us a lot.
because if you were actually going 55+ MPH at 4200 RPM, then you are very likely overpropped. It would take at least a 22 pitch prop to run 55 MPH at 4200 RPM.
Maybe that prop has been modified or something
the prop is a 5054-19, and my outdrive is a alpha one gen II with 1.50 ratio
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Old 08-10-2012, 07:13 PM
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Ok, that prop is a 14 X 19 Silverado., which is the same prop as a Mercury Vengeance.
I've seen that prop slip pretty bad trying to push a heavy boat. May not be your issue, but its definitely a possibility.

The numbers I mentioned were based on the 1.5 gear ratio, so that still works.

I'd grab a hand held GPS and see what kind of speed you were getting.
Also, just see what your rpm is doing when your trying to get up on plane.
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Old 08-10-2012, 07:19 PM
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Ok, that prop is a 14 X 19 Silverado., which is the same prop as a Mercury Vengeance.
I've seen that prop slip pretty bad trying to push a heavy boat. May not be your issue, but its definitely a possibility.

The numbers I mentioned were based on the 1.5 gear ratio, so that still works.

I'd grab a hand held GPS and see what kind of speed you were getting.
Also, just see what your rpm is doing when your trying to get up on plane.
thanks ken2, iam gunna play around with the carb on sunday, mark the prop and make sure its not spun, and note the rpms when the boat is trying to get up on plane, i should have my speedo fixed also the tubed pulled off the outdrive when i trailered it up, thanks for your help
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Old 08-11-2012, 09:54 AM
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Your problem might be trimming OD all the way down. Try adjusting it up a little and see how it acts.
Also when up on plane you adjust the OD for the highest rpm. You can watch the tach go up or down as you trim it.
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Old 08-11-2012, 11:29 AM
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If it's a q'jet you may be opening the air valve too early and losing metering thru the venturis. You should have about 3/4 turn on the air valve spring. Also check advance..I've seen rotors bind the advance mechanism. Most distributors have about 24 degrees in them, so you should be good on timing IF it is advancing properly.
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Old 08-23-2012, 08:23 PM
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What's the word?
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Old 08-23-2012, 08:31 PM
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I agree with cfauvel, need to trouble shoot the motor
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