Bayliner 300 / 315 Performance

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Jimbo 22

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Trying to establish what sort of fuel consumption I would be looking at from a Bayliner 300 or 315 fitted with twin 4.3 MPI Mercruisers

Would anyone have any data on rpm v speed, or rough consumption at 6 knots / cruise?

Appreciate there are many factors that can influence the numbers, however looking to gain a ‘rough’ idea on gph at those speeds.

Many thanks!








Thanks in advance!
 
Bayliner 300 / 315 with twin 4.3 Mercruisers - performance

Trying to establish what sort of fuel consumption I would be looking at from a Bayliner 300 or 315 fitted with twin 4.3 MPI Mercruisers

Would anyone have any data on rpm v speed, or rough consumption at 6 knots / cruise?

Appreciate there are many factors that can influence the numbers, however looking to gain a ‘rough’ idea on gph at those speeds.

Many thanks!
 
Re: Bayliner 300 / 315 with twin 4.3 Mercruisers - performance

Why 6 knots? Are you looking to keep it on the inland waterways?
Twin 4.3mpi will burn approx 8 lph at 1000 rpm, which would probably give you river speed. If you have to go up to 1500rpm, then you are looking at over double that.
 
Re: Bayliner 300 / 315 with twin 4.3 Mercruisers - performance

Thanks for that... Looking to keep it on the south coast... The run from the Hamble to the Solent would be at or around 6 knots, then looking at fuel flow for cruising speeds, in the region of 20-25 knots...
 
Re: Bayliner 300 / 315 with twin 4.3 Mercruisers - performance

Jimbo 22 said:
Thanks for that... Looking to keep it on the south coast... The run from the Hamble to the Solent would be at or around 6 knots, then looking at fuel flow for cruising speeds, in the region of 20-25 knots...
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Realistically, you are probably looking at somewhere in the region of 40lph combined at 3000rpm and 90lph combined at 4000rpm. You just need to find out what rpm the boat needs for those speeds, but I suspect it will be somewhere inbetween these two.
 
For a day out at mixed speeds and some at anchor and not going too mad I recon you will use about £120 worth of fuel. Why do I say that because in my 3 ltr single mercruiser 3 ltr I on average use about £45 in a day out

Working out consumption is not in my view the way to do these estimates it is real life average data that is best. My price is also based on buying petrol in cans from petrol stations not from a marina
 
Bigplumbs said:
For a day out at mixed speeds and some at anchor and not going too mad I recon you will use about £120 worth of fuel. Why do I say that because in my 3 ltr single mercruiser 3 ltr I on average use about £45 in a day out

Working out consumption is not in my view the way to do these estimates it is real life average data that is best. My price is also based on buying petrol in cans from petrol stations not from a marina
Click to expand...

Hi, Good vision and fit for many.

I use my own boat about 2000nm per year. I can choose to drive fast and use about 7000 liters or run slowly at 7kn and consume 1400 liters of fuel, something different to me?

NBs
 
Thanks!

Tend to agree with that, based in the Hamble we tend to run similar trips each day out, and base our current consumption on overall litres added over hours run to give a simple ‘average’ of cost per trip...

Rationale behind the post is we are considering going from a single 2.8 diesel to twin 4.3 petrols so just trying to get a better understanding of how many times we are likely to visit the fuel dock!
 
Again not the same boat but we have a single 5.7litre 350MAG mercruiser in a 22ft boat, the boat is on the heavy side for a 22ft.

Based in swanwick and cruising down the Hamble and out to most of the Solent destinations we can reckon on between £60 and £80 of fuel. You will find she has a sweet spot for cruising and I reckon the £100 to £120 range is possible if you can hit the sweet spot. However, the worst days for us are when we are fighting Solent chop, tide and wind and are bouncing around and the engine gulps fuel at that point. Best was £35 from Swanwick to Newtown Creek and back on a mirror flat day when she flew along at 40knots plus and must have skimmed her way over.

The problem you may have coming from a diseasal boat is getting throttle happy as you pass a smoke emitting hulk with the wind in your hair and the smooth roar of the engines in your ears, then your pocket will hurt.
 
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NBs said:
Hi, if help your same sitze sea ray rewiev and rmp/kn/consuptions data US gal, https://www.boatingmag.com/boats/sea-ray-310-sundancer-0#page-3

And https://www.boatingmag.com/boats/sea-ray-290-sundancer

You can look about fuel consuptions your bayliner...
NBs
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Both of those test boats were fitted with twin 5.0l V8 MPI, the 310 was actually on shafts too, so the figures are probably some way off what you are looking for. Also remember to convert US GPH into imperial.
 
CLB said:
Both of those test boats were fitted with twin 5.0l V8 MPI, the 310 was actually on shafts too, so the figures are probably some way off what you are looking for. Also remember to convert US GPH into imperial.
Click to expand...

When driving at 6kn, the difference is not great for a different power class machine, as it uses the same amount of horsepower to move at 6kn.

Consumption rises just above the twins mpi 4.3 engines 220HP and sea ray 315, a small difference certainly but not essential.

Sea-trial data supplied by the author. Fuel burn is per engine!!!

https://www.tradeboats.com.au/tradeaboat-reviews/engines/1403/mercruiser-43l-mpi-review

NBs
 
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Thanks all for your comments... will continue to consider the twin 4.3s, and also look to expand the search for data on the twin 4.2 Mercruiser 250 hp diesel options.
 
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