[C320-list] Fuel sender access

[RONALD HODEL]

Greg, 

My manual says maximum output at crankshaft is 29.1hp at 3600 rpm. 4000 sounds a bit high. And at 2800rpm my boat speed is about 6.5 knots (3 blade Gori prop in regular pitch). I’m wondering (and I’m totally a novice at this) if your tachometer is off by a bit.) I usually run at 2500 rpm.  I’ve heard of people rev ing their engine before shut down but I always thought that was to clear out their turbocharger (which I don’t have). I figure .75 gallons per hour for refueling. Thanks everyone for all the information. It’s helpful in long range planning.

Ron Hodel
Lokomaikai #1070

Sent from my iPad

> On Nov 5, 2020, at 11:30 AM, Greg Flanagan <greg.flanagan at shaw.ca> wrote:
> 
> I have a Yanmar Y3M30. I too use the engine hours ~ = fuel consumption? I cruise mostly at 2800rpm (~5knots). But I  run it at 3000 and 3200 for periods of time. I rev it to 4000 for a minute before shutdown after docking or anchoring. And I use the diesel furnace one in awhile. I can reliably approximate 2 litres per engine hour for refuelling. That’s about .5 US gallons. 
> 
> Cheers,
> 
> Greg
> Hoop Dancer #1076
> Sidney, BC
> 
>> On Nov 5, 2020, at 11:04 AM, Jack Brennan <jackbrennan at bellsouth.net> wrote:
>> 
>> Hi Dennis:
>> 
>> The fuel consumption chart for the Yanmar 3gm30 goes from .4 gallons an hour at 2000 to 1.6 at 3,400. At a cruising speed of 2,800, you get about .89 gallons an hour.
>> 
>> This gets a little tricky because you don’t want to run the diesel too slowly. That encourages carbon buildup and hastens a rebuild. Diesels want to be run hard to be long-lived. (I.E., 10,000 hours or more.) Better to burn a little more fuel and have a happy motor.
>> 
>> If you’re running slowly for some reason, get to an open stretch of water and crank it over 3,000 rpms for 10 minutes or so.
>> 
>> Jack Brennan
>> Sonas, 1998 Catalina 320
>> Tierra Verde, Fl.
>> Dolphin Cruising Club of Tampa Bay
>> 
>> 
>> 
>> 
>> Sent from Mail for Windows 10
>> 
>> From: Dennis Cookson
>> Sent: Thursday, November 5, 2020 12:53 PM
>> To: C320-List at catalina320.com
>> Subject: Re: [C320-list] Fuel sender access
>> 
>> Y
>>