New Power for 27 Tournament SeaCraft

TBubrick · #1 02-24-2018, 11:39 PM

Looking closely at the boat Todd has for sale. It has no power today, but an Armstrong bracket in place. The fuel tanks will hold a lot of fuel, about 380 gallons...and there is a 40 gallon fresh water tank to be installed. Also a double bow T-top.

My question is there a way to estimate performance of the various power choices? Recommendations have been from twin 200s, 225s, 250s and 300s. How might I get estimates of cruise speed and fuel burn?

Bigshrimpin · #2 02-24-2018, 11:47 PM

Talk to Ed Mancini aka. Trydent. He has the exact same boat with twin 250EFI's.

TBubrick · #3 02-25-2018, 12:23 AM

Is that a name on the board? don't see a name that matches in the members list. Any ideas how to reach him?

NoBones · #4 02-25-2018, 01:05 AM

Ed

He just posted about his 27 the other day....

Fr. Frank · #5 02-25-2018, 10:05 AM

The Royal Bahamian Defense Force still has a 27 SeaMaster (flybridge model) that now has twin 250 4-stroke Yamaha's. They are not on brackets, but on the transom that was cut down for outboards back in the mid-1990's. I understand from one of the guys that it cruises at about 23-25 mph, and has a top speed of nearly 50 mph. No clue about fuel usage, though.

The boat was first rigged with twin Yamaha 220 hp "Specials" back in '94, and actually had slightly better top end performance then, with a top speed of about 52-53 mph.

TBubrick · #6 02-25-2018, 10:11 AM

Quote:

Originally Posted by Fr. Frank

The Royal Bahamian Defense Force still has a 27 SeaMaster (flybridge model) that now has twin 250 4-stroke Yamaha's. They are not on brackets, but on the transom that was cut down for outboards back in the mid-1990's. I understand from one of the guys that it cruises at about 23-25 mph, and has a top speed of nearly 50 mph. No clue about fuel usage, though.

The boat was first rigged with twin Yamaha 220 hp "Specials" back in '94, and actually had slightly better top end performance then, with a top speed of about 52-53 mph.

Hope that is a much heavier boat. Really would like to be able to cruse at 30..

DonV · #7 02-25-2018, 11:09 AM

Quote:

Originally Posted by TBubrick

Hope that is a much heavier boat. Really would like to be able to cruse at 30..

You can, just kick it up to 4500 rpms...or more.

It will only hurt at the gas pump.

kmoose · #8 02-25-2018, 01:22 PM

The fastest, fuel efficient cruise will come from a power option with enough grunt to get it there without breaking the 4200-4400 rpm range (4 stroke). These are not light hulls and there will be a price to pay in performance if less than adequate displacement and hp is installed. There are lots of options that push it “fine” but considering the options on V6 power from 225 -300 hp the money gap between them is not so substantial to keep from going with at least 250. Tohatsu and Suzuki would be the most cost effective options by far among manufacturers unless 250 Optis’ are available in two strokes. G2s are an option but are not competitive price wise in the Florida market against the first mentioned and there is no telling when Yamaha will have V6 motors in stock with manufacturers waiting in line with motorless hulls.

In my opinion, a pair off 300 Zukes is a no brainer. Max displacement, max hp for the least money. It wouldn’t surprise me at all to see a 28 knot cruise @ 2 nautical with that combo.

DonV · #9 02-25-2018, 01:47 PM

Yepper, the cost between a Zuke 250 and 300 was only $500....duh!!

Bigshrimpin · #10 02-25-2018, 04:44 PM

Quote:

Originally Posted by Fr. Frank

I understand from one of the guys that it cruises at about 23-25 mph, and has a top speed of nearly 50 mph.

The cruise and top speed are so far apart. 23/25 is a SLOW cruise with 50mph top end. Assuming conditions allow it, there's no reason you couldn't have an efficient cruise @ 35mph.

Frank are those motors the 3.3L or 4.2L 250's?