Felix Gabrielov
02.06.2021 12:25:28
I am also cruise in the same area Solent etc, there could be many factors regarding mpg e.g. boat weight, hull design, props, sea conditions etc. [links]
See full version: AD31P fuel consumption
I am also cruise in the same area Solent etc, there could be many factors regarding mpg e.g. boat weight, hull design, props, sea conditions etc. [links]
Just acquired a 25ft Hardy Seawings. New to such a craft and a diesel engine, coming from a 20ft bowrider with a 4.3 mercruiser.
Trying to figure out where the sweet spot is.
Thanks more
Anyone have a single AD31P in around a 25ft craft. Interested to know what you find your most efficient speed and revs is and what sort of fuel consumption you get.
If 3600rpm feels better then I would try that and see how you get on, it won't harm the engine. The AD31 max rpm is 4100 and the volvo penta manual states "volvo penta recommends a cruising speed approximately 200rpm lower than the maximum rpm at wide open throttle". So basically I wouldn't want to cruise for long periods anything over 3800rpm. Also what props do you have, that will affect performance / speed to plane / top speed, mine has A6. Hope that helps. here
Also I should say there are occasions where I have recorded mpg to be around 3.5mpg. here
Today we went to the lake and the boat was running great. We stopped at the beach and dropped off some smaller kids and picked up 5 teens to go tubing. It pulled great for the first two runs but the third set of kids, the throttle was pushed all the way down and it would only going 9-11 mph. It was seriously lacking power. Then it did it again for a little while, while other smaller kids tubed, then it got better after and only bogged down a little while towing a little later but we weren't even near our weight limit and they weren't huge people tubing, we should of had plenty of power. It's really bothering me, what could cause this?? I also feel like the steering felt a little tight today. here
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He went onto explain that he sees the problem quite regularly, especially on boats that are raced locally; where the boat is cruised or used for off-shore racing the problem is more with corrosion than with a build up of carbon. His conclusion to this was that the locally raced boat’s engines are run for a short time to leave the mooring, get to the start area and then turned off, then again started post race for a short time to return to the mooring. Conversely boats that are raced off-shore or cruised have engines that are started and then run for a considerable time, allowing for all components to get to proper operating temperatures reducing the potential for carbon build up. Going on to say that this issue is not unique to Volvos but also prevalent in Yanmars as well as other engines that have a mixing (Raw water and exhaust gas) elbow.
Volvo D1-30 won’t rev, probably because of this. more
D1 30 Exhaust elbow blocked with carbon.
Most of the research he had done implied that the problem was with:
Dirty or blocked fuel filter(s).
Malfunctioning injectors.
Water of other contaminant in the fuel.
Even a dirty prop.
It occurred to me that I had seen this before on other boats, including G-whizz. The problem there was a blockage in the elbow at the back of the exhaust manifold where raw water is mixed with the exhaust gases. The offending component is circled in the accompanying picture. here
The mechanic who rectified the issue on G-whizz where it’s Volvo Penta D1-30 won’t Rev by replacing the elbow explained to me that the problem is a build up of carbon inside the elbow restricting the flow of exhaust gasses negatively affecting the engine’s performance. [links]