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PachangaSS said:
Unless Houston Prop tweaked it up in pitch...?
You would have to turn a 22" prop to 5600 RPMs to see 70. That's assuming 10% slip which is unlikely with that setup.

I heard Houston Prop does great work but the math doesn't add up. :)

Not trying to be a jerk, just trying to give some realistic exectations.
 

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Super24 said:
You would have to turn a 22" prop to 5600 RPMs to see 70. That's assuming 10% slip which is unlikely with that setup.

I heard Houston Prop does great work but the math doesn't add up. :)

Not trying to be a jerk, just trying to give some realistic exectations.
It wasn't before GPS, best GPS was, if I remember, 69.8. So you are correct, I was off .2mph. Great day for it, low humidity, downhill with a tail wind.
 

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here wt i would do get hand held gps hook a diffrene tack if tack is rigth you should do 72 mph if you number are on now you boat sitting in water looking at side 4in from lip so about 24ins showing to engine hach i had to replace the wood on egine hach back seat floor in middle seats above gas tank they rot and water lod try to lift egine hach by it self see if it real heavy i replace wood painted with 2001 interlux expoy primer 8 years still solid no rot my boat 480 hp 150 drive 25 p prop 70 mph 3 blade prop work best for top speed
 

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Zen_Nemo said:
I had a '91 240 with the 454 Mag in it. The prop was a Mirage Plus 21 pitch worked over by Houston Propeller and would run 68-70 all day long.

Put a 21-23p prop on it for starters.
As posted above, your prop slip is way too high.

I'd start by using an INDUCTIVE tach on your plug wires - and test your speed by GPS.

If you're slipping that much, your boat is too heavy... I'd bet it's more likely that your tach isn't properly calibrated.


I've got a 23.5 foot boat, 385hp mag 454, it runs a 23 pitch from the factory. I still think it can do better at 11% slip.
 

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When I had my 240 and I would get water over the swim platform and hatch if I came off plane to fast. This boat sits very low in the water. It has a built in swim platform which sits water level.

I had a stock 454 and had no problems getting on plane with a 22p 4 blade.
 

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Wow water coming over the hatch now that doesn,t sound right under any condition,if he is waterlogged can he fix by drying it out over a period of time or does he have to rip out all the wood?
I have a 1991 Baja 240 hole shot sucked! I ended up pulling out the floor and the stringers, all we rotted! When I pulled out all the saturated foam it weigh 900lbs! I have replaced stringers floor and foam . Just finished the fiberglass and painted the inside. I’ll be in the water haulin butt soon
 
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