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Fuel consumption

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eggharborrick

Contributing Member
"i know there are variables he

"i know there are variables here but i'm looking for a close ballpark answer. 85 silverton 34c with twin crusader 270's carbed. full fuel tanks, four people and no unusual equipment. calm day with no wind or abnormal tide run. what kind of fuel mileage can i expect at plane and a fast idle no wake run??"
 
"Rick:

Sounds like a few gu

"Rick:

Sounds like a few guys here have similar hulls (different years) but big blocks, not the small blocks you are asking about.

I'd expect them to be really worked hard pushing that much, even with a 2:1 gear. I wouldn't be surprise to see around 16 GPH each on plane. "Fast idle no wake" seems hard to do to me, maybe 3 gph for a starting wag."
 
"Good estimate. My Chrysler 3

"Good estimate. My Chrysler 360s burn between 8 and 12 GPH at 2,500 to 3,000 rpms.

Jeff"
 
"Rick,
Go to the FUEL FLOE

"Rick,
Go to the FUEL FLOE SENSORS thread and look at what my 35 Trojan gets."
 
"I don't have your hull, b

"I don't have your hull, but have learned twice about small engines pushing alot of weight. They work HARD, which isn't good for economy. I previously owned a 25 seacat with twin suzuki 140's. I got 1mpg. The engines worked their butt off to push that boat at almost WOT. Now I own a 29 phoenix 10k#'s with 350's and they don't work as hard, but still work too much, and I get 1 mpg. The smaller engines will not help you because they work harder. One day, I will be like Jeff and get 1.3 mpg. but I'm not brave enough to mess with my jets yet. Just my thoughts, I'd get 454's that are on "easy street" if I was to do it again.
Steve"
 
"I have to add, since you said

"I have to add, since you said "full tanks" and 4 people. I once made the mistake of filling my fuel tanks, 5 divers, 22 dive tanks and two extra BIG batteries, and set out 42 miles offshore in the gulf of Florida for an overnight dive trip (65ft, gulf is shallow BTW). 13.5 mph, 3000 rpms, 14 gph on flowcans "PER ENGINE" on the way out. Do the math, that trip was EXPENSIVE!! It got better on the way back with the fuel gone, but I realized you cannot work 350's very hard they are Sensitive to weight. We CRUSHED the fish, but NEVER again would I do that. Now I keep the boat light, dive close,clean the bottom every dive, carry a couple of tanks, and "overprop". Lessons learned, but at least I can afford to use my boat.
Steve"
 
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