Can anyone tell me what the approx fuel consumption is for a 9.9. four stroke on a 25' centerboard sailboat?? Thanks
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Throttle Setting
In general, the fuel consumption is about .10 gallon/hour/horsepower. At full throttle, it should burn about one gallon/hour. A lower throttle setting will lower this.
In general, the fuel consumption is about .10 gallon/hour/horsepower. At full throttle, it should burn about one gallon/hour. A lower throttle setting will lower this.
BF8 fuel consumption
I ran a consumption test last fall on my 1998 Honda BF8 8HP outboard to get an idea of how much fuel I would need for my Havre De Grace trip in the spring. Test parameters: Boat - 27', 7000 lb 3'9" draft Hunter. Also the boat has an inboard diesel, so there is a big three blade prop underneath slowing the boat down. I intentionally filled my water tank and left my fenders on. My BF8 has the standard prop - three blade roughly 9.25" x 8.6" - not the powerthrust prop. I can get to about 2/3 throttle with the prop, the boat just doesn't go any faster if I give it more gas, the engine just bogs down. I filled my spare 3 gallon tank with exactly half a gallon at the gas station. I left my marina using my normal 6 gallon tank and headed out to the river. I disconnected the 6 gallon tank, waited until the engine was about to die and plugged the hose into the 3 gallon tank and immediately set the throttle at about the 2/3 setting. I ran exactly 35 minutes when the engine died. I found later back at the marina that the 3 gallon tank still had at least four or five ounces left in the tank that the pickup tube couldn't reach. I'd venture a guess and say you would get even better results with your boat, maybe 3/4 gallon/hour going at a good clip, but to be safe budget 1 gallon/hr. Manny edited to add - I forgot to mention it's a four stroke
I ran a consumption test last fall on my 1998 Honda BF8 8HP outboard to get an idea of how much fuel I would need for my Havre De Grace trip in the spring. Test parameters: Boat - 27', 7000 lb 3'9" draft Hunter. Also the boat has an inboard diesel, so there is a big three blade prop underneath slowing the boat down. I intentionally filled my water tank and left my fenders on. My BF8 has the standard prop - three blade roughly 9.25" x 8.6" - not the powerthrust prop. I can get to about 2/3 throttle with the prop, the boat just doesn't go any faster if I give it more gas, the engine just bogs down. I filled my spare 3 gallon tank with exactly half a gallon at the gas station. I left my marina using my normal 6 gallon tank and headed out to the river. I disconnected the 6 gallon tank, waited until the engine was about to die and plugged the hose into the 3 gallon tank and immediately set the throttle at about the 2/3 setting. I ran exactly 35 minutes when the engine died. I found later back at the marina that the 3 gallon tank still had at least four or five ounces left in the tank that the pickup tube couldn't reach. I'd venture a guess and say you would get even better results with your boat, maybe 3/4 gallon/hour going at a good clip, but to be safe budget 1 gallon/hr. Manny edited to add - I forgot to mention it's a four stroke
Hey Brian - its a Renault!
The diesel is the original Renault. It was severely neglected when we bought the boat and It took me a long time to get it to run. It does now run but rear transmission seal leaks oil (even though I replaced the seals last winter. I had to build a aluminum circular pan to contain the oil when the engine runs. I just don't trust the thing. Plus since it's a one lunger, it shakes the boat like crazy and is loud as heck. My honda outboard is so much smoother and quieter. The diesel is my "emergency" engine! Manny
The diesel is the original Renault. It was severely neglected when we bought the boat and It took me a long time to get it to run. It does now run but rear transmission seal leaks oil (even though I replaced the seals last winter. I had to build a aluminum circular pan to contain the oil when the engine runs. I just don't trust the thing. Plus since it's a one lunger, it shakes the boat like crazy and is loud as heck. My honda outboard is so much smoother and quieter. The diesel is my "emergency" engine! Manny
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