Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 24-05-2016, 15:23   #1
Registered User

Join Date: May 2016
Posts: 3
Fuel Consumption Volvo 29hp

Can anyone advise on what is normal fuel consumption for a 29hp Volvo engine running at 2000rpm's? It is a 40' Manta catamaran. My husband left La Paz 20 hours ago and his gages are telling him that he has already used about 50 gallons. This does not make sense! Does anyone know anything for him to look at? Could it be that the gage is not reading accurately? Please advise if you have any clues!
__________________

__________________
McConnell is offline   Reply With Quote
Old 24-05-2016, 15:34   #2
Registered User

Join Date: May 2011
Boat: Hitchhiker, Catamaran, 40'
Posts: 354
Re: Fuel Consumption Volvo 29hp

They should burn half a gallon per hour. So with two motors running they would burn a gallon per hour. Are the gauges reading in liters perhaps?
__________________

__________________
Thumbs Up is offline   Reply With Quote
Old 24-05-2016, 15:51   #3
Registered User
 
Cotemar's Avatar

Join Date: Dec 2007
Boat: FP, Helia 44 Evo
Posts: 5,717
Re: Fuel Consumption Volvo 29hp

McConnell,

Maybe this chart will help.
.5 gal at 2000 rpm
Attached Thumbnails
Click image for larger version

Name:	VP30hp fuel.jpg
Views:	761
Size:	156.8 KB
ID:	124820  
__________________
Cotemar is offline   Reply With Quote
Old 24-05-2016, 16:01   #4
Registered User

Join Date: May 2016
Posts: 3
Re: Fuel Consumption Volvo 29hp

Thank you so much! I will pass this on to my husband next time we can connect.
__________________
McConnell is offline   Reply With Quote
Old 25-05-2016, 08:12   #5
Marine Service Provider

Join Date: Jul 2011
Location: In Myrtle Beach, then southbound
Boat: Lagoon 410
Posts: 368
Re: Fuel Consumption Volvo 29hp

First to McConnell, never, ever trust a fuel gauge on a boat. They are notoriously inaccurate. The best way, IMHO,to measure the usage is by hours run.

Cotemar, I'm not sure where that chart came from, but from my experience on my boat, the usage on the chart at cruise rpm's is nowhere close to what I'm seeing in real life. At 2800 rpm I am seeing a solid .625 gallons an hour. When I plan our stops for fuel I use .75 gallons an hour as a safety number. This number comes from tracking the hours and gallons used and then doing the math. I'm not sure what I burn at 2000 rpm, but in any case, again IMHO, 2000 rpm is too slow for cruising speed. That engine needs to spin between 2700-2900 at cruising. I pulled this from the manual.

Cotemar, what did you have in your Mahe? And McConnell, tell him to speed up...
__________________
In Florida headed south for the Keys, then north...
www.elcaminoblog.com
Sid at SailAway is offline   Reply With Quote
Old 25-05-2016, 08:48   #6
Registered User

Join Date: Jan 2010
Location: Narragansett Bay
Boat: Able 50
Posts: 3,055
Re: Fuel Consumption Volvo 29hp

Are you sure about the 2800rpm? I don't know all the Volvos but 2800 seems to be more like the recommended max than the cruising revs on a Volvo. The range generally does not rev as high as a Yanmar which can be as high as 4000 rpm.

I would expect the cruising revs on a small Volvo to be more like 2200 rpm.
__________________
savoir is offline   Reply With Quote
Old 25-05-2016, 09:09   #7
Registered User

Join Date: Feb 2016
Posts: 15
Re: Fuel Consumption Volvo 29hp

Hi, my FP Lucia40 cat has 2x30hp Volvos. I clocked about 3L per hour each engine at average cruising rev of 2800. Conditions of other components (oil, fuel filters etc) do impact performance.
__________________
Yong SC is offline   Reply With Quote
Old 25-05-2016, 09:16   #8
Registered User

Join Date: Feb 2006
Location: Meandering St Marten to Grenada for hurricane season
Boat: Lagoon 470 cat
Posts: 262
Re: Fuel Consumption Volvo 29hp

My feeling is that the only way to have any real usability/accuracy on a fuel gauge is to run tank empty then make your own table of gauge reading and amount of fuel put in. Even then it is only a guideline as many gauges do "steps" where they jump an 1/8th at a time or so rather than a smooth curve. Tracking hours and gallons when refueling are certainly the best / most reliable.

Also agree with those that say run the engines harder. Is he running both engines all the time or only one? Many (most now?) cats only run one when underway unless trying to beat a sunset or storm.

Bill
__________________
Moontide is offline   Reply With Quote
Old 25-05-2016, 09:47   #9
Registered User

Join Date: Dec 2014
Location: Windsor, Ontario, Canada
Boat: Beneteau First 375
Posts: 70
Re: Fuel Consumption Volvo 29hp

I have a volvo model 2003 28 horsepower in a 17,000 pound mono hull.
When running 2250 rpm I use .8 gallons an hour. Based on my consumption,with twin engines and the lower rpm he should have only used around 30 gallons.
__________________
Sinbad51 is offline   Reply With Quote
Old 25-05-2016, 09:52   #10
Registered User

Join Date: May 2016
Posts: 3
Re: Fuel Consumption Volvo 29hp

Thank you all for so much for great info! It has been passed on. He did stop into Cabo to top up fuel to see how much was really used, and it did not correspond to gauge usage. He feels much better about making it to Turtle Bay! And yes, he will up the RPM's now that he knows the fuel usage does appear to be more in line with his planning calculations.

This is a new boat for us, so not sure on all of her operating specs, but we needed to get it up to the US ASAP and did not have the luxury of shakedown trips to get all of the kinks worked out!
__________________
McConnell is offline   Reply With Quote
Old 25-05-2016, 09:53   #11
Registered User

Join Date: Jun 2015
Posts: 1,165
Re: Fuel Consumption Volvo 29hp

My 27HP Vetus (Mitsubishi K3D) burns 2L (= 1/2 US Gallon) per hour at 2K RPM. That would translate to other makes of engine pretty directly since specific fuel consumption for diesels doesn't differ much twixt makes.

20 hours * 2 engines * 1/2Gall/hr = 20 Gallons.

I agree with Sid - don't trust the gauges. Best to have a dipstick, but few boats are fitted so one can be used. Prolly due to consumers' preference for "hy tech" over utility :-)

20 gallons = 80 litres, close enuff, so if the gauges were marked in litres they would still be wrong.

But McConnell - tell you husband to have a really good look around for leaks. It doesn't take long to loose 30 gallons. As the boat is a catamaran and he's (apparently) singlehanding, he may be outta the smell of a leak, and unable to see the evidence of one from the steering position. 30 gallons is about a hundred and eighty pounds in weight so if it's sloshing around somewhere it wouldn't upset the trim of the boat noticeably.

TrentePieds
__________________
TrentePieds is offline   Reply With Quote
Old 25-05-2016, 09:53   #12
Registered User
 
Cotemar's Avatar

Join Date: Dec 2007
Boat: FP, Helia 44 Evo
Posts: 5,717
Re: Fuel Consumption Volvo 29hp

Quote:
Originally Posted by Sid at SailAway View Post
Cotemar, I'm not sure where that chart came from,

Cotemar, what did you have in your Mahe? And McConnell, tell him to speed up...
Sid at SailAway,

The Fuel Consumption chart pictured came from a Volvo Penta D1-30 spec sheet.

My FP Mahe 36 had Volvo Penta D1-30 engines and that .5 gal at 2000 rpm was accurate from my experience with those engines.

Itís very common for Captains making very long passages or deliveries to use lower RPM to keep the boat moving during low wind days.

When youíre making a 3000 mile trip across the Atlantic from the Canaryís to St. Martin you had better know how to conserve fuel.

I believe the OP (Original Post) Mr. McConnell is bringing home his new boat or doing a delivery of some kind.

So whatís good for cruisers here, is not necessarily good for Mr. McConnell trip
__________________
Cotemar is offline   Reply With Quote
Old 25-05-2016, 11:02   #13
Marine Service Provider

Join Date: Jul 2011
Location: In Myrtle Beach, then southbound
Boat: Lagoon 410
Posts: 368
Re: Fuel Consumption Volvo 29hp

Quote:
Originally Posted by savoir View Post
Are you sure about the 2800rpm? I don't know all the Volvos but 2800 seems to be more like the recommended max than the cruising revs on a Volvo. The range generally does not rev as high as a Yanmar which can be as high as 4000 rpm.

I would expect the cruising revs on a small Volvo to be more like 2200 rpm.
Here's where I pulled the numbers. I cruise at 2800 using one engine and make 6 knots. I've made so many fuel checks that I'm pretty confident in the .625gph burn at 2800rpm. I'm still confused as to how Cotemars chart can be so far off. Cotemar, thoughts? That's basically double what I burn.

__________________
In Florida headed south for the Keys, then north...
www.elcaminoblog.com
Sid at SailAway is offline   Reply With Quote
Old 25-05-2016, 11:17   #14
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Albany Ga.
Boat: Island Packet 38
Posts: 17,032
Re: Fuel Consumption Volvo 29hp

The BSFC or Brake Specific Fuel Consumption of all small Diesels will be surprisingly close, they are all close to being equally efficient, meaning a Volvo, Kubota or Yanmar making say 20 HP will all burn very close to the same amount of fuel. Turbos and one or two other things may change it some, but not as much as you may think.

RPM to make that 20 HP may vary of course, so comparing RPM to RPM will yield different answers
__________________
a64pilot is offline   Reply With Quote
Old 25-05-2016, 11:20   #15
Registered User
 
Cotemar's Avatar

Join Date: Dec 2007
Boat: FP, Helia 44 Evo
Posts: 5,717
Re: Fuel Consumption Volvo 29hp

Sid at SailAway,

At 2800 RPM your pretty much running at MAX RPM for a Volvo Penta D1-30 (30hp)

I have no idea what motor you have and what your specs. are.

The spec's I am posting are the ones the OP is asking about. for a Volvo Penta D1-30 (30hp).
Attached Thumbnails
Click image for larger version

Name:	VP_D1-30_TD.jpg
Views:	161
Size:	121.6 KB
ID:	124868   Click image for larger version

Name:	VP_D1-30.jpg
Views:	451
Size:	437.0 KB
ID:	124869  

__________________

__________________
Cotemar is offline   Reply With Quote
Reply

Tags
consumption, fuel, volvo

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Desperate: Need new/used collar for a 1inch shaft Volvo Penta 3cyl 29hp (Dripless Sea clifflyon Propellers & Drive Systems 0 20-05-2015 15:10
For Sale: YANMAR 29HP ENGINE- 3YM30 Miss Calypte Classifieds Archive 0 02-11-2014 15:38
New boat, which engine?! 3YM30|SD20 29hp or 3JH5E|SD50 39hp? Bunt Engines and Propulsion Systems 14 03-09-2013 02:53
Volvo Sail 29hp svone Engines and Propulsion Systems 3 15-08-2010 19:09
Fuel Consumption for Volvo Penta TMD 22 nigel1 Engines and Propulsion Systems 3 04-06-2010 11:37



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 05:57.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.