1991 2520 pilot house re-power advise wanted

[Capt.Paul]

I currently have twin yamahas 200hp 1991 working excellent, but the gas is a bit too much. I don't run the oceans I stay in the LI sound. I'm thinking of an engine that would give me better gas and can push the boat well, any advice? Does anyone have the boat with a single 225 or 250 4 stroke? BTW it has a gill bracket motor mount.

thanks
Paul

 

[mrGeeze]

Take one off and keep it as a spare.
I run a 1987 25' Sou'Wester Pilothouse on a single Yammie 150 4 Stroke.
On a flat sea with a clean bottom I can make just shy of 30 knots WOT.
Normally I cruise 20-24 knots at 42-4500rpm
All a man needs.
I run 1 hour offshore to the fish, fish all day, run home and put about 30 gallons in the tank.


I realize you have a slightly deeper hull.
But 50 horse more should give you comparable performance.

Just my $.02

 

[gw204]

Have you considered a prop change? You have some old school, low tech wheels on there.

 

[HOTPURSUIT]

Question...How does your boat perform with the twins in respect to manuvering say when docking. I had twin inboards in my last boat and I could spin that boat on a dime and get her in and out of tight spaces no sweat. I now have a 2520 with a single 225 bracket mounted and I really miss the manuverability that the twins provided exspecially on windy days. I was wondering how a 2520 performed with twins OB's

2003 2520XL 225 4stroke, cruise 42-44 RPM 23-27 knots

 

[Capt.Paul]

Since I do have older model yamahas, 1991 200hp and the props are from older technology. How do I go about getting advise on for correct prop size for my boat?

 

[DaleH]

How do I go about getting advise on for correct prop size for my boat?

Simple, determine the MAX RPMs of the motors. Have typical gear carried every aboard the boat aboard. Best done in the Spring (cooler air) with a clean running bottom, where with just you and 1/3rd or so fuel on-board, you should be turning RPMs to be no more than 200 RPMs off max. Pick your props to meet that requirement or send out what you have to be tweaked.

'Lugging' a motor (too high a pitch) by running 400 or more off max RPMs, and then adding more weight in fuel, crew, gear, and ice ... is the surest way to kill a motor less not having oil.

 

[Megabyte]

I have a single 225 OX66 on my 1996 vintage (14 degree deadrise) 2520 MVSC
My close by neighbor has a 250 four stroke on his 2008 vintage (16 degree deadrise) 2520XL

No complaints from either of us running singles.

 

[Brent]

I bet you dollars to donuts that your OB is shinier than his new OB