For my on topic friends...
 

You have got to see this.... :)
http://www.bath.ac.uk/~ccsshb/12cyl/

For my on topic friends...
 

Now That's impressive! I wonder if I could mount such an engine in a
Bayliner? ;) It should plane out quickly enough.

Capt. Frank

CCred68046 wrote:

You have got to see this.... :)
http://www.bath.ac.uk/~ccsshb/12cyl/

For my on topic friends...
 

CCred68046 wrote:

You have got to see this.... :)
http://www.bath.ac.uk/~ccsshb/12cyl/

Wow!

I wonder what it redlines at? One cool thing about
the big commercial ship diesels is that no
reduction gear is needed, which saves cost,
weight, & maintenance.

Fair Skies- Doug King

For my on topic friends...
 

G Probably around 105 RPM ..... more important to some would be it's
"barred speed range" (if any) and where it's at.

DSK wrote:
CCred68046 wrote:


You have got to see this.... :)
http://www.bath.ac.uk/~ccsshb/12cyl/


Wow!

I wonder what it redlines at? One cool thing about
the big commercial ship diesels is that no
reduction gear is needed, which saves cost,
weight, & maintenance.

Fair Skies- Doug King

For my on topic friends...
 

On Wed, 19 Nov 2003 15:04:15 GMT, "Capt. Frank Hopkins"
wrote:

Now That's impressive! I wonder if I could mount such an engine in a
Bayliner? ;) It should plane out quickly enough.

===========================================

Stringer reinforcement highly recommended, and at more than 25 gallons
per minute the ride will be short. :-)

That makes my 454s look almost economical.

For my on topic friends...
 

On Wed, 19 Nov 2003 17:03:31 +0000, otnmbrd wrote:

G Probably around 105 RPM ..... more important to some would be it's
"barred speed range" (if any) and where it's at.

I'm not familiar with *big* diesels, but I was surprised at how slowly
that sucker turned, maximum power at 102 RPM.

For my on topic friends...
 

On Wed, 19 Nov 2003 14:46:51 -0500, thunder
wrote:

I'm not familiar with *big* diesels, but I was surprised at how slowly
that sucker turned, maximum power at 102 RPM.

================================

Big squirrels run slow...

For my on topic friends...
 

How the heck do they crank it to get it started??


"otnmbrd" wrote in message
ink.net...
G Probably around 105 RPM ..... more important to some would be it's
"barred speed range" (if any) and where it's at.

DSK wrote:
CCred68046 wrote:


You have got to see this.... :)
http://www.bath.ac.uk/~ccsshb/12cyl/


Wow!

I wonder what it redlines at? One cool thing about
the big commercial ship diesels is that no
reduction gear is needed, which saves cost,
weight, & maintenance.

Fair Skies- Doug King

For my on topic friends...
 

On Thu, 20 Nov 2003 03:32:59 GMT, "Snafu"
wrote:

How the heck do they crank it to get it started??
=========================================

We had a discussion about that earlier this year, answered by Rick our
resident LARGE diesel expert. To make a long story short, they use
compressed air stored in large accumulator tanks, and admitted into
the cylinder heads through a special set of valves used only for
starting the engine.

In an emergency you can hand crank...

....but not very much.

For my on topic friends...
 

Snafu wrote:
How the heck do they crank it to get it started??


Air .....lotsa air... most big diesels on ships, have limited amounts of
starts when maneuvering. However, this has greatly improved with newer
ship. They generally have over a dozen, before they run out and have to
wait to rebuild supplies.

For my on topic friends...
 

On Thu, 20 Nov 2003 04:04:48 GMT, otnmbrd
wrote:

They generally have over a dozen, before they run out ...

Spot on. CFR's say there is supposed to be sufficient for 12 starts.

Rick

For my on topic friends...
 

Snafu wrote:
How the heck do they crank it to get it started??


Air .....lotsa air... most big diesels on ships, have limited amounts of
starts when maneuvering. However, this has greatly improved with newer
ship. They generally have over a dozen, before they run out and have to
wait to rebuild supplies.

Thanks for the info.

Just looking at the pix at the massive size, it has to take incredible air
volume and pressure to get that huge crankshaft rolling. I'm guessing that
once you get one of these things running, you don't want to shut down very
often.

For my on topic friends...
 

"Snafu" wrote:
How the heck do they crank it to get it started??


WaIIy wrote:
You ever see those Sumo guys? No problem.

Now *that* was funny.

DSK

For my on topic friends...
 

Snafu wrote:

Thanks for the info.

Just looking at the pix at the massive size, it has to take incredible air
volume and pressure to get that huge crankshaft rolling. I'm guessing that
once you get one of these things running, you don't want to shut down very
often.


When maneuvering in port, each time you go from ahead to astern, you
need to stop the engine, then restart it in the opposite direction.
Naturally, while docking, you'll mostly be at "stop", and occasionally
to frequently (G depending on the pilot and conditions) have to start
it for needed maneuvers .... which eats up air.

otn

For my on topic friends...
 

They use a 454. grin

C.F.

Snafu wrote:

How the heck do they crank it to get it started??


"otnmbrd" wrote in message
ink.net...

G Probably around 105 RPM ..... more important to some would be it's
"barred speed range" (if any) and where it's at.

DSK wrote:

CCred68046 wrote:



You have got to see this.... :)
http://www.bath.ac.uk/~ccsshb/12cyl/


Wow!

I wonder what it redlines at? One cool thing about
the big commercial ship diesels is that no
reduction gear is needed, which saves cost,
weight, & maintenance.

Fair Skies- Doug King

For my on topic friends...
 

On Fri, 21 Nov 2003 02:05:09 GMT, "Capt. Frank Hopkins"
wrote:

They use a 454. grin

C.F.

Snafu wrote:

How the heck do they crank it to get it started??

========================================

Probably more like a couple of 12v92TIs driving big mutha air
compressors.

For my on topic friends...
 

On Thu, 20 Nov 2003 22:08:32 -0500, Wayne.B
wrote:


Probably more like a couple of 12v92TIs driving big mutha air
compressors.

More common are couple or three "big muthas" squeezing about 5000
cubic feet per hour to around 400 psi driven by 75 hp electric
motors.

Rick

For my on topic friends...
 

"Whadya mean we used the wrong oil and the motor needs new rings?"


-- Rich Stern
www.nitroowners.com - The Nitro and Tracker Owners Web Site
www.mypontoon.com - The Pontoon Boat Web Site
www.fishingreportdatabase.com - The Fishing Report Database
www.mysporttrac.com - The Sport Trac Web Site

For my on topic friends...
 

Eight Hundred Thousand Dollars?!?! But its just a piston!

CCred68046 wrote:
You have got to see this.... :)
http://www.bath.ac.uk/~ccsshb/12cyl/