THANKS...For this information...
But if you do choose to stay with an engine propped for 1600 rpm you will not damage the engine at all PROVIDED you dont try and go above that rpm. The weakness in this configuration is that you can never use the engines full power. If you try it will smoke and if you persist in trying you will damage it.
Yes you have hit it exactly and every salient point...
All the numbers work as you say, I have worked them myself, sadly I
cannot access Boat Diesel
. com from my address in Vietnam
seems to be no way to contact the administrators.
Now a few more points of information and a few questions if I may....
Point 1...The original set up would have worked correctly IF in actual
fact the engine speed was 1600 ROM at WOT. It is not, just this
afternoon I checked again WOT..Stops solid at 2,800 as yanmar says it
Yes, thought went into the initial installation
I am sure, just the wrong numbers were used.
Yes there is room for the 1.04 prop.
We swapped the prop down to 94 on the advice of the local prop shop,
a guy with a tin shack and a few props outside.
To give you an idea of what it is like here..
Can you sell me a deep cycle battery
I asked at the battery
shop... How big you want ?
But it is a truck starting battery..
That is all we have is you do not like it, find what you want somewhere else....Would you like some tea ?
As my concerns for the age and hours on the engine grew, I found
another engine and dug deeper then before and got the new info from
Yanmar..2,800 WOT 165 BHP.
I posted here for advice...
Got the heck confused out of me, but the consensus was that I was
badly over propped and going to damage the engine.
I wondered about this, as I never run it into a smoking condition.
Question number 1...More for my understanding then anything else..
If the engine is not over loaded as evidenced by.. No smoke, No
Overheat, No burned pistons, valves... How am I damaging it ? This seems to me more like derating it... can you please shed some light on
that question for me ? Forget that question you answered it already...
That was a big question for me ! And we DO NOT run it till it smokes !!! We back it off about 150 rpm.
Okay onward....when I wound it up today to 2,800 in neutral it was noticeably noisier, which was one of the first points of concern I
raised....It may quiet under load at any expected cruising speed of about 2300 but it is noisier then 1700.
Moving along...I went and counted some gear teeth yesterday, and found
the new gear box is 3.83..versus the 3.08 on the old engine...
If I swap gearboxes..(Both look great internally, no chipped teeth and
I have a spare set of clutch
plates..also I just replaced all of the bearings in the old box and it is good as new) and leave my current
prop....I will up the max revs a bit to (I GUESS) about 2300 before it smokes, still not enough to get 2,800 WOT..
Again everybody is pushing for WOT....
A big issue for me with questions I have posted here and other forums
has been that people try to pilot my boat in their conditions, we are a dive boat..by definition we do not go out in heavy weather
my final anchor
choice is fully half what people recommended and we
have never dragged it and never will...
I do not want or need an extra knot
, especially at the increase in fuel consumption
along quite comfortably at 1700 rpm and
11.6 km/h (6.25 knots) burning 5 gallons an hour more or less....
Okay now we address prop pitch
..props are not sold here with pitch numbers..
They tell you the diameter, if you like it, buy it, if not find something else you like more. And no I do not know where to get a differant one, would you like have some tea ?
So I have located an 80 Cm prop on the island, which I can swap for my 1.04 and a hundred bucks or so.
I found a copy online last night of
Handbook and glanced through it, I believe I can measure it the 80 cm, and I calculate it will need a pitch of about 24 to 25
Question #2 do you agree with that pitch on an 80cm 3 blade
Thanks so much for the answer in the first paragaraph, I was under the impresion that I was somehow loading some part of the engine in such a way that was demanding more torque then some critical part could deliver, I could make no sense about how I was going to break it.
Please, your thoughts on the pitch, no rush, engine swap in over a month and I will not have the 80 here to measure for a week or so..
Again my thanks for a sensible answer...At least it fits all of my observations, and what I have been able to learn from reading.
I simply have more engine then I need, in fact I pushed the builder
to put in a 4 cylinder, but he was adamant about a 6.