Can diesel exhaust temperature be used for performance - SailNet Community
 
LinkBack Thread Tools
post #1 of 10 Old 04-08-2009 Thread Starter
Senior Member
 
Zanshin's Avatar
 
Join Date: Aug 2006
Location: Germany
Posts: 2,323
Thanks: 0
Thanked 31 Times in 29 Posts
Rep Power: 11
 
Can diesel exhaust temperature be used for performance

A friend of mine, who skippers an Alloy megayacht, recently gave me a tour and was expounding upon how he uses the exhaust temperature gauges to give him optimal performance on his engines with variable pitch props. I have been thinking of adding a temperature gauge as well, since I have a Gori propeller with "overdrive" functionality and think I can use that and the exhaust temperature to ensure that I don't overload the engine and also get the maximum performance from my diesel.

Has anyone here either done this or heard of it being done on a smaller (75HP Yanmar) engine?


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Zanshin is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 10 Old 04-08-2009
the pointy end is the bow
 
erps's Avatar
 
Join Date: Aug 2006
Location: La Conner, Washington
Posts: 6,264
Thanks: 2
Thanked 27 Times in 26 Posts
Rep Power: 12
   
Highway truckers monitor their exhaust temperature for performance and monitorning for problems. When we used to troubleshoot engines, we would watch the temperature for each exhaust manifold for temperatures either on the warm side or cool side.

Ray
S.V. Nikko
1983 Fraser 41
La Conner, WA


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


Boating for over 25 years, some of them successfully.
erps is offline  
Quote Quick Reply Share with Facebook
post #3 of 10 Old 04-08-2009
Senior Member
 
Capnblu's Avatar
 
Join Date: Mar 2006
Location: Squamish
Posts: 660
Thanks: 0
Thanked 4 Times in 4 Posts
Rep Power: 11
 
You got it Zanshin. EGT monitoring is a very good way of monitoring your engines efficiency. When you learn what you are doing, you'll be able to diagnose lots of engine, and drive line problems also. Combine this with a coolant sensor, vacuum gauge, throttle position sensor, and you can visualize what your ears and nose and toes are telling you. Record all your base lines, and track changes. For those who don't want to plumb in the various sensors, but still want to play, Infrared thermometers are available to the general public at reasonable costs ($100) just point and shoot, presto temp. readings where you could never reach! Perfect for the clogged heat exchanger.

Why, why, why?
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

I Don't Know! I Don't Know!
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Capnblu is offline  
Quote Quick Reply Share with Facebook
post #4 of 10 Old 04-08-2009
Senior Member
 
tommays's Avatar
 
Join Date: Sep 2008
Posts: 4,304
Thanks: 1
Thanked 34 Times in 34 Posts
Rep Power: 9
 
BUT the trucks dont water cool there Exhaust or Exhaust manifold and try and keep that comparment cool for saftey


And O2 that lived through a bit of water sensor was one of the big problems on gas powered EFI boats that are moving to Cats in 2010 and the ones they use on big Outboards require far more looking after than auto units

1970 Cal 29 Sea Fever

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

1981 J24 Tangent 2930
Tommays
Northport NY


If a dirty bottom slows you down what do you think it does to your boat
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
tommays is offline  
Quote Quick Reply Share with Facebook
post #5 of 10 Old 04-10-2009 Thread Starter
Senior Member
 
Zanshin's Avatar
 
Join Date: Aug 2006
Location: Germany
Posts: 2,323
Thanks: 0
Thanked 31 Times in 29 Posts
Rep Power: 11
 
Interesting replies, thanks. I talked with a Yanmar service rep here (in St. Martin) and he convinced me that going to the effort of drilling/welding a mounting for a gauge, then doing the wiring would be too much work; I should just see what Revs (or %age of max revs) I get in "overdrive" mode and compute it from there. I like the idea of using an infrared temperature gun and might look into finding one here - but I will have to find a "target" on the engine exhaust that will give me a correct reading prior to cooling.
I think I will put more effort into located volume in the boat that can be used for additional fuel tank(s) and might just convert one cabin to fuel storage using those waterbed like flexible fuel tanks. The specific background to the fuel question was that I would like to sail for Horta from the Caribbean next week using the rhumb line route and the weather isn't quite ready - so I will most likely need to use the engine as I will be sailing on a bit of a schedule.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Zanshin is offline  
Quote Quick Reply Share with Facebook
post #6 of 10 Old 04-10-2009
Senior Member
 
Capnblu's Avatar
 
Join Date: Mar 2006
Location: Squamish
Posts: 660
Thanks: 0
Thanked 4 Times in 4 Posts
Rep Power: 11
 
Zanshin, I know there is a thread around here of someone whom uses the IR Temp gun. and they have painted several dots in strategic locations to monitor engine temps. I think it may be SailingDog, if not I'm sure he will know which boat it is. Even if you are monitoring exhaust gas at your heat exchanger, you will still benefit from monitoring the EGT. You will learn that the idiosyncrasies of your engine as it warms, and settles into its operating temp. Over time as your heat exchanger fouls, water pump wears, coolant ages, etc. You will be able to monitor the temps of the various locations, recorded into a spreadsheet. In time temp reading will change as problems slowly arise. In the long run you should be well informed and prepared in advance for any preventative maintenance. I do realize you originally wanted to RUN your engine at a specific EGT. but you can also use engine temp. to do the same thing, also the data available will probably reflect the sensors the engine was manufactured with, (coolant versus EGT.) Hope this helps.

Why, why, why?
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

I Don't Know! I Don't Know!
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Capnblu is offline  
Quote Quick Reply Share with Facebook
post #7 of 10 Old 04-10-2009
Courtney the Dancer
 
jrd22's Avatar
 
Join Date: Nov 2000
Location: San Juan Islands., WA, USA
Posts: 3,942
Thanks: 4
Thanked 27 Times in 26 Posts
Rep Power: 17
 
Most ships run a dry exhaust, like trucks, so you would need to plumb it into a location before where the cooling water enters. Pyrometers in trucks are used to keep from overheating while pulling hills, and it's pretty dramatic how fast the temp can go up if you keep your foot on the throttle when the RPM's start dropping if you don't downshift. If you are properly propped you should never have to worry too much about it in a sailboat (especially if you don't have a turbo), your coolant temp alarm should alert you to an overheating situation before you do any damage even if you don't have a temp guage (most Yanmars ?). I could definitely see an advantage to having a Pyro in a tug boat with variable pitch prop, or any large diesel engine for that mattler.

John
SV Laurie Anne

1988 Brewer 40 Pilothouse

jrd22 is online now  
Quote Quick Reply Share with Facebook
post #8 of 10 Old 04-10-2009
Senior Member
 
timebandit's Avatar
 
Join Date: Sep 2002
Posts: 928
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 15
 
So if you had access to this information what would you do with it??

Rick
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Mac 25
Copernicus
Southern California
I am not a prejudice racist sexist bigot. I just hate stupid people.
timebandit is offline  
Quote Quick Reply Share with Facebook
post #9 of 10 Old 04-10-2009
Senior Member
 
tommays's Avatar
 
Join Date: Sep 2008
Posts: 4,304
Thanks: 1
Thanked 34 Times in 34 Posts
Rep Power: 9
 
IMHP a water pressure guage which is common on big outboards would stop far more problems

1970 Cal 29 Sea Fever

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

1981 J24 Tangent 2930
Tommays
Northport NY


If a dirty bottom slows you down what do you think it does to your boat
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
tommays is offline  
Quote Quick Reply Share with Facebook
post #10 of 10 Old 04-10-2009
Senior Member
 
blt2ski's Avatar
 
Join Date: May 2005
Posts: 7,146
Thanks: 1
Thanked 40 Times in 39 Posts
Rep Power: 13
   
From driving my share of diesels, having a water temp and EGT guage can be good. Both measure parts of the overall equation of what will or will not harm an engine. Sometimes the water starts to go sooner than the exhaust, but usually I found the exhaust to go quicker towards the too hot end of things before the water was even close to hitting something to be worried about. Especially if you are pushing limits.

On the other hand, not sure if on my boat it would be worth the effort as it is in the trucks I use for work.

marty

She drives me boat,
I drives me dinghy!
blt2ski is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Diesel Exhaust Hose/Pipe 1970Columbia34 Gear & Maintenance 3 05-12-2009 07:34 PM
Any Gearhead's? Capnblu Sailboat Design and Construction 40 11-23-2008 07:58 PM
Exhaust Temperature oft Gear & Maintenance 1 07-31-2008 11:49 AM
Diesel Exhaust Systems Sue & Larry Gear and Maintenance Articles 0 11-07-2001 08:00 PM
Replacing the Diesel Engine Sue & Larry Gear and Maintenance Articles 0 06-12-2000 09:00 PM

Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome