Exhaust waterline question? - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > General Interest > General Discussion (sailing related)
 Not a Member? 


Like Tree1Likes
Reply
 
LinkBack Thread Tools
  #1  
Old 11-05-2012
First String
 
Join Date: Jan 2009
Location: South carolina
Posts: 789
Thanks: 39
Thanked 7 Times in 7 Posts
Rep Power: 6
ltgoshen is on a distinguished road
Exhaust waterline question?

So when I am under way using the 2GM Yanmar on my 1980 C&C MK1 at 2300 rpm's the exhaust port starts to go below the water line? Is this normal? I would think it would be better on top of the water line? Instead of under it..
Any thoughts on this?


I was also wandering if anybody had a like boat and engine that can give me a "SWAG" of the fuel burn? This boat seams to go for ever without burning much fuel. I have been 15 or 16 times out this summer on day sails, with little or no wind sometime and the tank has barely moved. I was Just wandering. I don’t need a hard answer to many variables’ involved for truth. Something close would be close.
Thanks again.
Curtis
Reply With Quote Share with Facebook
  #2  
Old 11-05-2012
SchockT's Avatar
Senior Member
 
Join Date: May 2012
Location: North Vancouver, BC
Posts: 1,422
Thanks: 1
Thanked 27 Times in 25 Posts
Rep Power: 3
SchockT is on a distinguished road
Re: Exhaust waterline question?

Some boats, mine included, partially submerge their exhaust port under full power. It is not an issue as long as the exhaust hose has an adequate riser, which it should. On your boat it may be that you are carrying too much weight aft causing her to "squat" under power. I seem to recall a lot of C&Cs have their exhaust ports at the very bottom of their transom.

As for fuel consumption, you can expect to burn somewhere in the neighborhood of 1/2 gal per hour. If you have been motoring as much as you say and your fuel gauge hasn't moved, you might want to confirm that it is working. I don't have the luxury of a gauge so I use a dipstick which leaves no doubt as to how much fuel is onboard!
__________________
1979 Santana 30 Tall Rig
Hull#101
Reply With Quote Share with Facebook
  #3  
Old 11-05-2012
rugosa's Avatar
Senior Member
 
Join Date: Aug 2011
Location: In a strange land
Posts: 507
Thanks: 0
Thanked 6 Times in 6 Posts
Rep Power: 3
rugosa is on a distinguished road
Re: Exhaust waterline question?

We have the same engine in C & C, power out from winter layup to sail about 9 miles to home port, power half way to race start weekly, power out of channel to do a couple of Sunday races too, same for pleasure sails weekly and then back to layup in October. We topped up $40 diesel in September and another $10 before lift out. We pay $1.43/litre. They sip the fuel, rather than guzzling it.

We also submerge the exhaust when crew of 5-7 is in the cockpit, but the exhaust runs high to the underside of the deck by the transom so we are not concerned. Changed that 25 year old hose and fuel lines this year, sleeping better at night now.
Reply With Quote Share with Facebook
  #4  
Old 11-05-2012
chef2sail's Avatar
Senior Member
 
Join Date: Nov 2007
Location: Maryland
Posts: 6,914
Thanks: 29
Thanked 54 Times in 50 Posts
Rep Power: 7
chef2sail will become famous soon enough
Send a message via AIM to chef2sail
Re: Exhaust waterline question?

OUr 35 MKIII C&C usually runs with the exhaust under water. It does have a water muffler and riser. Our 3GMF Yanmar uses approximently 1/2 gallon per hour at 2700 rpm. Make sure you run your Yanmar at minimum suggested rom...usualkly 3500-2700 to prevent carbong buildup in exhaust elbow.

Dave
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
___________________________
S/V Haleakala (Hawaiian for" House of the Sun")
C&C 35 MKIII Hull # 76
Parkville, Maryland
(photos by Joe McCary)
Charter member of the Chesapeake Lion posse

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


“Sailing is just the bottom line, like adding up the score in bridge. My real interest is in the tremendous game of life.”- Dennis Conner
Reply With Quote Share with Facebook
  #5  
Old 11-05-2012
msmith10's Avatar
Junior member, rest old
 
Join Date: Feb 2009
Location: Columbus Ohio
Posts: 492
Thanks: 3
Thanked 0 Times in 0 Posts
Rep Power: 6
msmith10 is on a distinguished road
Re: Exhaust waterline question?

Normal for exhaust exit to go a couple of inches underwater in the C&C 30-1. The boat "squats" under power. Doesn't hurt anything. As stated above, just make sure you have a loop in the exhaust hose between the waterlift and the exhaust exit. In my boat the exhaust hose loops up high into the transom before going down to the exit point.
__________________
Mark Smith
1977 C&C 30 Mk 1 hailing from Port Clinton, Ohio
Reply With Quote Share with Facebook
  #6  
Old 11-05-2012
First String
 
Join Date: Jan 2009
Location: South carolina
Posts: 789
Thanks: 39
Thanked 7 Times in 7 Posts
Rep Power: 6
ltgoshen is on a distinguished road
Re: Exhaust waterline question?

There is a water muffler and going out of it there is a long hose, newer looking that goes high between the cockpit floor and the transom. So it sounds like it would be plumed correctly and I should not worry if it is gurgling. I did only notice it when we had 5 or 6 in the cockpit and pushing it a bit.
Thanks for the insight,

On the other question RPM's, how would I find out what the Minimum recommendation is for the 2GM 13 hp engine? Would you recommend running it at the top side of that setting to help clean carbon out? Like my Dad use to say he was doing with his old dodge dart?
Thanks again for the help

[IMG][/IMG]
Reply With Quote Share with Facebook
  #7  
Old 11-05-2012
First String
 
Join Date: Jan 2009
Location: South carolina
Posts: 789
Thanks: 39
Thanked 7 Times in 7 Posts
Rep Power: 6
ltgoshen is on a distinguished road
Re: Exhaust waterline question?

Quote:
Originally Posted by msmith10 View Post
Normal for exhaust exit to go a couple of inches underwater in the C&C 30-1. The boat "squats" under power. Doesn't hurt anything. As stated above, just make sure you have a loop in the exhaust hose between the waterlift and the exhaust exit. In my boat the exhaust hose loops up high into the transom before going down to the exit point.
Thanks Mark.
Reply With Quote Share with Facebook
  #8  
Old 11-05-2012
msmith10's Avatar
Junior member, rest old
 
Join Date: Feb 2009
Location: Columbus Ohio
Posts: 492
Thanks: 3
Thanked 0 Times in 0 Posts
Rep Power: 6
msmith10 is on a distinguished road
Re: Exhaust waterline question?

From the picture you posted that's a very nice looking C&C 30. I wish mine was that shiny.
__________________
Mark Smith
1977 C&C 30 Mk 1 hailing from Port Clinton, Ohio
Reply With Quote Share with Facebook
  #9  
Old 11-06-2012
chef2sail's Avatar
Senior Member
 
Join Date: Nov 2007
Location: Maryland
Posts: 6,914
Thanks: 29
Thanked 54 Times in 50 Posts
Rep Power: 7
chef2sail will become famous soon enough
Send a message via AIM to chef2sail
Re: Exhaust waterline question?

lt....my exhaust is actually undermeath the transome facing down at the water below the boot strip. Oour ransome is a bit smaller and lifted out of the water though.

Dave
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
___________________________
S/V Haleakala (Hawaiian for" House of the Sun")
C&C 35 MKIII Hull # 76
Parkville, Maryland
(photos by Joe McCary)
Charter member of the Chesapeake Lion posse

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


“Sailing is just the bottom line, like adding up the score in bridge. My real interest is in the tremendous game of life.”- Dennis Conner
Reply With Quote Share with Facebook
  #10  
Old 11-06-2012
First String
 
Join Date: Jan 2009
Location: South carolina
Posts: 789
Thanks: 39
Thanked 7 Times in 7 Posts
Rep Power: 6
ltgoshen is on a distinguished road
Re: Exhaust waterline question?

Quote:
Originally Posted by msmith10 View Post
From the picture you posted that's a very nice looking C&C 30. I wish mine was that shiny.
Thanks Mark,
That photo was after her bottom job and buffing job back in march of this year, She is a fine looking boat. She sails real nice when you get her in her grove I can almost, just let her go. if she gets too much air she will try to go to weather. Ease her main ever so slightly and she's back in the grove. I didn’t quite know what I was getting in for when I got this boat but, I’m beginning to fall in love all over again!!!!
I dont if you sean how bad she was when I found her. tak a look and you can tell she is looking better than she was.
S/V East Coast Lady: Photos of the progress
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Exhaust Leak Question... tkawika Diesel 8 05-31-2011 03:16 PM
Waterline paint question: How to factor in provisioning weight? chrisncate General Discussion (sailing related) 18 01-13-2011 09:22 PM
Exhaust Question SailingWebGuy Gear & Maintenance 9 12-14-2010 11:17 AM
Exhaust maintenance question Seafarer31 Gear & Maintenance 6 06-02-2008 01:13 PM
Wet exhaust question Tanzerite Gear & Maintenance 0 05-29-2007 10:17 PM


All times are GMT -4. The time now is 06:47 AM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.