RS4 (B7 Platform) Discussion Discussion forum for the B7 Audi RS4

The Dreaded Fuel Dilution Issue

Thread Tools
 
Search this Thread
 
Old 02-27-2007, 05:38 AM
  #1  
AudiWorld Member
Thread Starter
 
Big Hank's Avatar
 
Join Date: Nov 2006
Posts: 206
Likes: 0
Received 1 Like on 1 Post
Default The Dreaded Fuel Dilution Issue

For now, let's assume that it is a real issue.
Is it worse to run the engine at high RPM's or low RPM's?
ie: is more fuel getting by if the engine is lugging or wide open?
Old 02-27-2007, 06:23 AM
  #2  
AudiWorld Super User
 
Bob W.'s Avatar
 
Join Date: Mar 2000
Posts: 24,309
Likes: 0
Received 0 Likes on 0 Posts
Default

lugging would be worse.
Old 02-27-2007, 06:35 AM
  #3  
AudiWorld Super User
 
RI A6's Avatar
 
Join Date: Apr 2005
Posts: 3,198
Likes: 0
Received 1 Like on 1 Post
Default Worst to best: Repeated Cold Start, Idling, Sitting in Traffic, WOT, Lugging , Cruising.

Fuel dilution under normal operation is proportional to the torque the engine is producing. At startup and low RPMS (like idle) more fuel blows by and/or washes down the cylinder wall.
Old 02-27-2007, 07:37 AM
  #4  
AudiWorld Super User
 
ELEVENS's Avatar
 
Join Date: Jun 2006
Location: great lakes, yoo ess of eh
Posts: 4,596
Received 8 Likes on 8 Posts
Default

How about lugging while cold under WOT
Old 02-27-2007, 08:22 AM
  #5  
Senior Member
 
daveak05's Avatar
 
Join Date: Dec 2005
Posts: 8,364
Likes: 0
Received 0 Likes on 0 Posts
Default I would say cold and WOT...

cold, the fuel isn't vaporizing optimally. WOT is a no-brainer, IMO...it's why your gas mileage plummets. More fuel is being used and some of that doesn't burn in combustion and get's by into oil.
Old 02-27-2007, 08:48 AM
  #6  
AudiWorld Super User
 
VerrÜckt's Avatar
 
Join Date: Feb 2003
Posts: 16,402
Likes: 0
Received 0 Likes on 0 Posts
Default

I agree.
Old 02-27-2007, 08:50 AM
  #7  
Senior Member
 
daveak05's Avatar
 
Join Date: Dec 2005
Posts: 8,364
Likes: 0
Received 0 Likes on 0 Posts
Default Lugging is more of a concern for bearings than fuel dilution...

the load lugging puts on main bearings at crankshaft can be damaging.
Old 02-27-2007, 10:54 AM
  #8  
AudiWorld Super User
 
Bob W.'s Avatar
 
Join Date: Mar 2000
Posts: 24,309
Likes: 0
Received 0 Likes on 0 Posts
Default

he didn't ask about bearings, but i agree w/you.
Old 02-27-2007, 11:43 AM
  #9  
AudiWorld Member
 
SteveLRS4's Avatar
 
Join Date: Jun 2006
Posts: 190
Likes: 0
Received 0 Likes on 0 Posts
Default Does using FP60 and LC20 help significantly?

If so, how does it prevent fuel dilution?
Old 02-27-2007, 12:11 PM
  #10  
Senior Member
 
daveak05's Avatar
 
Join Date: Dec 2005
Posts: 8,364
Likes: 0
Received 0 Likes on 0 Posts
Default wondering how someone can lug an RS4 with the 6 gears...

i know you can lug it if you're trying, but shouldn't be a problem. therefore, how it figures into fuel dilution is questionable, IMO.


Quick Reply: The Dreaded Fuel Dilution Issue



All times are GMT -8. The time now is 04:37 PM.