cruising rpm

[Deleted User YDKXO]

LOL, I believe the first thing he would confirm is that he has a dozen more cylinders and 28 (!) more liters in his e/r overall, being Match powered by C32 rather than C18 engines...
Anyway, I'm pretty sure that the historical numbers are indeed recorded in any electronically controlled Cat engine, including the 3196.
IIRC, there's some trick (i.e. button combination) for showing them in the display, but I'm not positive about that.
Anyway, Cat engineers can surely read all that with their diagnostic tool - also because that could affect the warranty, incidentally.

Whoops, jfm will have a go at me again!

With regard to the Cat 3196, the total and average fuel burn may have been recorded somewhere but the data certainly wasn't available to the user through the usual Cat displays. Yes I guess a Cat technician could access the data through the diagnostic port

 

[Portofino]

When I had Kad 300 in 8000 kg s of Sunseeker Portofino 35 ,
3000 rpm mabe 3100 ish was the cruise .This equated to 26-27 knots -were sea state permitted .
WOT in rhe book was something like 3850 ,but actual achievable especially near the end when I sold it was down @ 3450 -3500 .( tired turbos + 9 y of " age" )
So 3000 gave me plenty of head room as the WOT decreased over years .
Unscientific ally it sounded right @ arround 3000 .At say 3100 to 3300 it sounded stressed and noisey made a right racket .with the engine hatch open -real sound ,not from the helm .Sounded " sweet" @ 3000
So if I were you -if the book says WOT less 10 % for fast cruise -which VP tend to do then that's where should be ,
So 3000 + a little bit more should be OK for the D6 iMHO .As mentioned above designed for this .
I guess it gets up and planes at arround 17-18 knots - so 20 knot cruise is close in a heavey sea , to it being knocked off in a head sea ?

 

[curiouskb]

When I had Kad 300 in 8000 kg s of Sunseeker Portofino 35 ,
3000 rpm mabe 3100 ish was the cruise .This equated to 26-27 knots -were sea state permitted .
WOT in rhe book was something like 3850 ,but actual achievable especially near the end when I sold it was down @ 3450 -3500 .( tired turbos + 9 y of " age" )
So 3000 gave me plenty of head room as the WOT decreased over years .
Unscientific ally it sounded right @ arround 3000 .At say 3100 to 3300 it sounded stressed and noisey made a right racket .with the engine hatch open -real sound ,not from the helm .Sounded " sweet" @ 3000
So if I were you -if the book says WOT less 10 % for fast cruise -which VP tend to do then that's where should be ,
So 3000 + a little bit more should be OK for the D6 iMHO .As mentioned above designed for this .
I guess it gets up and planes at arround 17-18 knots - so 20 knot cruise is close in a heavey sea , to it being knocked off in a head sea ?

20 knots in a strong head sea is too much for me. Yes it plans around 17 knots. Guess I shall be revving at 2900 to 3000 rpm cruising not to overstress the VP.

 

[Bandit]

Speed wise is this all she has ever done or are you well down on speed?

How clean is the hull ?

when was the last time she was lifted and high pressure washed?

 

[curiouskb]

Speed wise is this all she has ever done or are you well down on speed?

How clean is the hull ?

when was the last time she was lifted and high pressure washed?

She could just touch 28 knots max when new. Now 6 months old with 200 hours, bottom just cleansed, can only reach 26 knots WOT. But I have added a RIB and other personal gears etc. so guess it is now heavier. Otherwise she performs beautifully.

 

[Chris_d]

She could just touch 28 knots max when new. Now 6 months old with 200 hours, bottom just cleansed, can only reach 26 knots WOT. But I have added a RIB and other personal gears etc. so guess it is now heavier. Otherwise she performs beautifully.

That sounds fairly normal but I see Princess now offer a Cummins 2x550hp option on the P43, its sounds ridiculous to describe the D6 435hp versions as underpowered and Yotties will be choking on their Fray Bentos pies, but clearly with the smaller engines the range of cruising speeds available is narrowed down considerably.

 

[curiouskb]

That sounds fairly normal but I see Princess now offer a Cummins 2x550hp option on the P43, its sounds ridiculous to describe the D6 435hp versions as underpowered and Yotties will be choking on their Fray Bentos pies, but clearly with the smaller engines the range of cruising speeds available is narrowed down considerably.

Well you pay more(which I don't want to) for the Cummins which are also heavier and more thirsty. Probably not for those who wants more speed but I would say 435 is adequate power for me and must say it is a beautiful sea boat.

 

[James L]

I personally wouldn't be worried about over stressing the engines, as long as you don't go everywhere at WOT you'll be fine.
Diesels like to be worked and you'll do more damage letting them idle or under working them than you'll ever do by driving them too hard.

The figure earlier in this thread about the Cat engines burning 375k liters of Diesel before needing a rebuild says a lot about what these engines are designed for.
If you manage to spend £750,000 on Diesel before having to overhaul your engines, the cost of the overhaul won't hurt too much.

Just choose the speed you're most comfortable with, it probably won't be WOT. Take care of the engines by starting off and finishing your outings gently and regular checks and they'll be fine.

 

[jfm]

Yes Deleted User the big colour Cat displays mounted on the engines (c32 not c18, LOL!) show total fuel burned over the life of the engine, with also a trip function (that I've never used) with total fuel burned since trip reset. Plus a whole load of other data like average rpm, number of hours at idle, and so on. I'll post a pic at weekend - there is much interesting data on the screen

 

[Deleted User YDKXO]

Yes Deleted User the big colour Cat displays mounted on the engines (c32 not c18, LOL!) show total fuel burned over the life of the engine, with also a trip function (that I've never used) with total fuel burned since trip reset. Plus a whole load of other data like average rpm, number of hours at idle, and so on. I'll post a pic at weekend - there is much interesting data on the screen

It would be interesting to see that. Does it give average load factor as well?

 

[James L]

Yes Deleted User the big colour Cat displays mounted on the engines (c32 not c18, LOL!) show total fuel burned over the life of the engine

Apologies, but that sounds like the worst feature you could have on a boat.
I would suggest as part of your big refit, you place a strategic piece of insulation tape over that number

 

[curiouskb]

I personally wouldn't be worried about over stressing the engines, as long as you don't go everywhere at WOT you'll be fine.
Diesels like to be worked and you'll do more damage letting them idle or under working them than you'll ever do by driving them too hard.

The figure earlier in this thread about the Cat engines burning 375k liters of Diesel before needing a rebuild says a lot about what these engines are designed for.
If you manage to spend £750,000 on Diesel before having to overhaul your engines, the cost of the overhaul won't hurt too much.

Just choose the speed you're most comfortable with, it probably won't be WOT. Take care of the engines by starting off and finishing your outings gently and regular checks and they'll be fine.

Thanks for the advice, much appreciated.