[C320-list] Yanmar 3Gm30 typical fuel consumption?

[Warren Updike]

I averaged fuel consumption over a 2 yr period and came up with 0.5gal/hr for the Perkins M30, 27HP. We usually try to run at about 26-2800rpm as that is the optimum rpm for this engine. That is the point at which fuel efficiency is maximized according to the Perkins information. (max-rpm x 0.8 is recommended cruising speed per Nigel Calder)
Engine is 22 yrs old with >2,000hrs, and you can't tell the engine is running by the color of exhaust: there is no color.

Warren and Pattie Updike
1994 C320 "Warr de Mar" #62
Middle River, Chesapeake Bay

-----Original Message-----
From: John Frost [mailto:john at frostnet.net] 
Sent: Saturday, June 04, 2016 12:54 PM
To: C320-List at Catalina320.com
Subject: Re: [C320-list] Yanmar 3Gm30 typical fuel consumption?

The spec for my 3YM30 (Note the Y) has a chart that says approximately
.3GPH @2000RPM 
.4GPH at 2250RPM
.6GPH at 2500RPM
1.1GPH at 3000RPM
1.3GPH at 3250RPM
1.7GPH at 3500RPM
1.9GPH at 3650RPM 

                                         +
Happy Sailing!          /||\
John                           / ||  \
                                  /    ||    \
                                /      ||      \
                              /        ||        \
                            /          ||          \
                          /            ||            \
                        /              ||              \
                      /                ||                \
                    /                  ||                  \ 
                  /                    || Hull 1118 \ 
                /                      ||                      \ 
              /                        ||                         \
            /     Catalina     ||                           \
          /     C320MKII    ||                             \ 
        /            2007         ||                                \ 
      /                                ||_____________\ 
    /_____________||____ 
    _________/__________\_____|__ 
     \              Lake Guntersville, AL                    l_
      \________________________________) 
                                  \       |                              |  | 
                                    \__|                               |_|
-----Original Message-----
From: C320-list [mailto:c320-list-bounces at lists.catalina320.com] On Behalf Of Karl Mielenhausen
Sent: Saturday, June 4, 2016 11:32 AM
To: C320IA Discussion List
Subject: Re: [C320-list] Yanmar 3Gm30 typical fuel consumption?

Yanmar literature states 0.3 gpm (actually 1.1 lpm) at 1800 rpm.

Karl

On Sat, Jun 4, 2016 at 10:16 AM, Graeme Clark <cg at skyflyer.co.uk> wrote:

> Hi all. I have a broken fuel gauge and we have logged 30 hours since 
> tank was last filled. The local fuel supplier has had a breakdown and 
> I'm some considerable distance from next nearest, with light to calm winds!
> Trying to assess my likely remaining fuel. Of that 30 hrs a large part 
> has been sub 1500rpm just mooring up etc I'm thinking about 0.4 gal/hr 
> maybe 0.5 to be conservative. I have a spare gallon can also!
> Anyone have a better guess?
> Thanks
> Graeme
> #366, currently in the Isles of Scilly!
>
>
> Sent from mobile: please excuse typos etc.!
>
>
>