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| Why is my Catalina 251 sooooooooo slow ? |
| Author |
Message |
    
Mike Nolan
New member
Username: 84catalina
Post Number: 1
Registered: 10-2009
| | Posted on Wednesday, October 07, 2009 - 09:59 pm: | 
|
I have an 84 Catalina 251 that I'm trying to sell. The 305 was replaced long ago with a Chevy 350. I've had this motor at 4500 rpms and it seems not to plane at all and tops at about 13.8 mph. It has a stock reman'd prop on it. The bottom was recently painted with no growth. The trim tabs are fully down.... I'm plowing tons of water. Someone please help !! Everyone I take for a ride questions the "slowness" of the boat. |
Robert A. Fierro
Advanced Member
Username: sandkicker
Post Number: 939
Registered: 06-2008
| | Posted on Thursday, October 08, 2009 - 10:34 am: |
|
RE:"stock reman'd prop"
I'd start by looking at the prop. Most likely the wrong pitch.
Was it always this slow...i.e., was it this slow when you first put the 350 in "long ago"
Also... when you are at 4800 rpms, how far is the throttle open??? 50, 75 or 100%???
If 100%, the first thing is to check the easiest thing to fix...i.e. at full throttle (at the helm) is it full throttle at the carb? ( with engine off, remove flame arrestor, open choke all the way and look in the carb throat.) |
Mike Nolan
New member
Username: 84catalina
Post Number: 2
Registered: 10-2009
| | Posted on Thursday, October 08, 2009 - 12:42 pm: |
|
The motor was replaced before I owned it.
I did check the throttle at full. It's pegged and is adjusted correctly.
When running at 4800, the throttle is wide open
The pitch is what everyone says to run.... ie stock when new. Seems that the boat just dont have the umph to get up on plane. The engine is working hard at that point. What it feels like is that I'm towing an open parachute behind me.
Maybe transmission slippage? That would be the only thing besides the prop that would cause it. Anyway to test? |
Robert A. Fierro
Advanced Member
Username: sandkicker
Post Number: 947
Registered: 06-2008
| | Posted on Tuesday, October 13, 2009 - 01:27 pm: |
|
What is the transmission reduction ratio?
Propeller dia and pitch are dependent on the tranny's reduction ratio. Is the transmission original?
I'm still not clear on if this boat ever ran right for you with the 350 in it ? |
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