Volvo Penta Running Rich - Page 4 - 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 > On Board > Gear & Maintenance
 Not a Member? 
  #31  
Old 11-20-2007
MacGyverRI's Avatar
Senior Member
 
Join Date: Nov 2007
Location: East Providence, R.I.
Posts: 360
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 7
MacGyverRI is on a distinguished road
Quote:
Originally Posted by erps View Post
Not trying to beat a dead horse but just breaking it down a bit so I can understand it....

Take two mason jars, each the same size, and put the lids on them. Apply a vacuum of 20" on one of the jars. Which one has more air in it? (20" is the vacuum a gas motor pulls at idle) I don't think the restricted air intake on a gasoline motor can be discounted.
Gas engines use throttle plates to restrict the RPMS.

A Diesel uses the specific injector calibration (mm3) at a regulated fuel pump pressure which is limited by the governor to restrict the RPM's and that's why the Diesel intakes are big so there wont be a vacuum.
__________________
Ken, East Prov., R.I. Bootlegger, PY26 Paceship

If you like my posts, or they were helpful, please click the "scales" icon on top right to add Rep points.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #32  
Old 11-20-2007
MacGyverRI's Avatar
Senior Member
 
Join Date: Nov 2007
Location: East Providence, R.I.
Posts: 360
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 7
MacGyverRI is on a distinguished road
Quote:
Originally Posted by Rockter View Post

So, if the temperatures are 10 degC and 50 degC respectively, convert both to the absolute temperature scale (just add 273 to both) and write as...

rho1/rho2 = (50+273)/(10+273) = 323/283 = 1.1413

...or about 14 percent more dense.

The motor would rather breathe the denser air.
On a typical boat gas engine w/ a computer, the computer would compensate via the O2 sensor and meter the injectors.

On a typical boat diesel w/ just a mechanical fuel pump, it would just run leaner w/ denser air. same fuel/more air = leaner.

Next,
Put the same diesel boat in a lake (if it exists) in Denver Co. and the lack of air density @ 1mi. above sea level and POOF! it will run richer. This is why older cars in higher elevations had to get the carbs. re-jetted smaller.

A gas engine boat w/ computer would run the same because the computer would compensate.

I'm still betting the OP just needs to really clean the injectors....
__________________
Ken, East Prov., R.I. Bootlegger, PY26 Paceship

If you like my posts, or they were helpful, please click the "scales" icon on top right to add Rep points.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #33  
Old 11-20-2007
Senior Member
 
Join Date: Sep 2006
Posts: 2,207
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 9
Rockter will become famous soon enough
Take the engine covers off and tell us what happens. Does the black smoke reduce?
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
Volvo Penta Outboard? rhbroehl Gear & Maintenance 9 07-23-2011 01:40 PM
Volvo Penta not buzzing stack Jeanneau 17 10-14-2010 09:44 AM
Volvo Penta Marine Diesel MD11C Parts Source? ntheyer General Discussion (sailing related) 35 04-07-2010 02:33 PM
Volvo Penta engine rondezvous Gear & Maintenance 1 09-24-2006 12:24 PM
Running Backstays Dan Dickison Gear and Maintenance Articles 0 05-14-2002 08:00 PM


All times are GMT -4. The time now is 04:36 PM.

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.