Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help

Go Back   PeachParts Mercedes ShopForum > Technical Information and Support > Tech Help

LinkBack Thread Tools Display Modes
Old 08-15-2003, 11:46 AM
EricSilver's Avatar
Registered User
Join Date: Mar 2000
Location: Fairfax, VA
Posts: 1,249
Fuel Droplet size and flow rate to Combustion Chamber

Does anyone know

1.) the average size of fuel droplets sprayed from a properly functioning injector into a combustion chamber and

2.) the fuel flow rate in gallons/hr?
2001 E430 4matic
122,xxx miles
Black/Charcoal Interior

Gone but not Forgotten:
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black
Reply With Quote
Old 08-15-2003, 09:18 PM
Meza's Avatar
Registered User
Join Date: Jan 2003
Location: SC
Posts: 148
The droplet size in a combustion chamber depends on several factors such as injection pressure, distant from spary orfices, and angle of spary. The higher the injection pressure, the smaller they are in size. spray pattern is also important. The spray trajectory (called a ploom) is produced by each orfice in the nozzle (in diesel). If one lags or angle of sparay changes, the plooms will hit each other and higher droplet size will occur. You will need a high speed camera (about $100K), a laser beam, and a pressure chamber to accurately see the spary pattern. There is no uniform droplet size out of an injector. You would have to look at a droplet size distribution. Usually ranges between 30-250 microns in a gas injector. In a diesel engine, injection pressure is a major and important factor effecting diesel droplet size and hence particulate matter (Soot) size distribution that ranges from 3 to about 1000 microns in diameter in newer engines and from about 300-3000 microns in older engines.
I think in a 124 260e, the pressure to open the injector is about 3 bar (~45 psi) and it's dependent on the fuel pump pressure.

To get fuel flow in Gallons/hour you need to do a volumetric flow rate measurement. It different and I believe is depends on pump pressure. If you let the injector (or pump) spary for 30 seconds into a container and you get 1 Liter/1 minute, you can convert this quantity into gallons/hour. I think it would be difficult to do this at home with electronic injectors, however, the injectors in a 260e can be tested by energizing the fuel pump and pushing the sensor plate down by hand (linear relation). The injector will spray. The spray is very flamable. Be careful if you try this.
1993 190E 2.6
Advanced Diesel Systems Test and Research Engineer
Reply With Quote


Thread Tools
Display Modes

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -4. The time now is 12:54 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page