BlewByYou88
Member
Post pics, I'd like to see how this turns out! Good Luck!
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Back on the water but with a 20' pontoon for now wife said we can try it for a year or so. I was cruzin e-bay and found some intresting projects for people that live close to them.
Pontoon Boat!? The Hell you gonna do with a pontoon boat?! Retake Omaha Beach!?
Fuel consumption information | ||||||||||
Blew By You, 1988 268 Sea Ray Sundancer Twim 4.3L LX 4 Barrel Rochester Qaudrajet Carbs | ||||||||||
Onan 3.0kW Genset - 100 Gal. Fuel - 40 Gal Fresh Water Tank - 9000 BTU A/C Unit | ||||||||||
Props: Mercury Vengance 48 16318 21P (13 3/4 x 21P) | ||||||||||
RPM Range: 4400-4800 | ||||||||||
Conditon: Full Fuel, Two Coolers, Full fridge, Two Adults, 3x 13" Anchors, Bedding, Ropes, Gear…Ect | ||||||||||
Elevation: 3600' - Light Chop - Light wind - Maximum Trim up - Minimal Tab | ||||||||||
RPM | 2900 | 3100 | 3400 | 3500 | 3800 | 4000 | 4200 | 4400 | ||
GPH | 12 | 13.4 | 15.4 | 16.4 | 26.2 | 26.5 | 27 | 28 | ||
MPG | 1.83 | 1.94 | 1.85 | 1.89 | 1.34 | 1.39 | 1.44 | 1.53 | ||
Speed | 22 | 26 | 28.5 | 31 | 35 | 37 | 39 | 43 | ||
FYI: Fully loaded Onan 3.0 kW MAJB Genset .6 GPH Fuel Consunption |
Interesting numbers BBY.
I'll bet my 454 is not any better than these numbers (fuel consumption wise)....and I'll never see 43mph.
Best I can do is 31 at 4200 with my 16x16 prop.
Thanks for the data!
Twins are a wonderful thing! Exactly what that boat needs.
I can get 36mph with my old 15 x 17 prop, but she falls off plane at 24mph which is not good in heavy Lake Michigan/Lake Huron seas.
The BB is easy to work on due to an abundance of space in the engine room, however, twin 4.3's would be the cats butt for speed and handling.
We are in the "SAME Boat" lol! When it comes to planing. I have to have her about 22-24 MPH to stay up or she falls as well, but that's all hull design. I measured it out one day, it would be possible to drop two 5.7L engines down in the hole, but I squat so bad in the water as it is, I would probably sink her. I want to put a bigger platform on her too, but I'm just worried about her sag.
Hmmm, interesting. I never would have guessed that your boat would fall off plane at the same speeds.
These old girls would be better with some weight toward the snout instead of so much weight in the can.
Kinda sounds like those bowlegged women I used to swim with...cheers! LOL!
Had the same problem with my 454 powered 268 and the admiral didn't like the ride at 24mph in rough seas, nor did she like wallowing around off plane which was even more uncomfortable! I decided to remove the rather small trim tabs and put the largest width and deepest tabs without changing the position of the ram (can't recall the size now) and WOW - what an improvement!!
I recall being able to plane at 18mph which allowed a much more comfortable ride, especially with a lot of cross chop. This would allow the bow to cut into waves with more of a pushing feel than a slapping or "wham" action that was definitely NOT healthy for anything attached to the inside of the hull.
It also helped the boat be more stable on calmer days on plane. With a little tab deployed along with the drive up it seemed to plant the stern firmer in the water. Before this the boat always seemed tippy on plane, like it was balancing on the head of a pin. Any wind or shifting of passengers would set it on one side or the other. Definitely better with the larger tabs!