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-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion

LinkBack Thread Tools Display Modes
Old 06-01-2014, 10:32 AM
Registered User
Join Date: Sep 2007
Location: Calgary Alberta Canada
Posts: 1,276
Injector Pop vs chatter

I was playing around with some older injectors and had noticed that the initial pop pressure varies somewhat in relation to chatter pressure. For example one injector popped at 1960 psi but chatters at 1870. Another one pops at 1990 but chatters at 1940. It's the difference in pop vs chatter pressure that I was wondering about. Sometime it's roughly 50 psi and others shows up to 120 psi difference. Is this anything to be concerned about or what have others observed?

Reply With Quote
Old 06-01-2014, 11:03 AM
spock505's Avatar
Registered User
Join Date: Nov 2007
Location: Blighty
Posts: 1,363
Interesting as I am about to test a set.

Could it be there is a degree of 'bounce' when chattering?

1996 Mercedes S124 E300TD - 129k - rolling restoration project -

1998 Mercedes W210 300TD - 118k (assimilated into above vehicle)
Reply With Quote
Old 06-01-2014, 11:57 AM
Registered User
Join Date: Aug 2010
Location: Sacramento, CA
Posts: 2,543
Lookup my post on an electronic pop tester. I give time traces of the fluctuating pressure. It does look like a triangle wave, w/ ~50 psi amplitude. Problem is I found the chattering depends more on how you handle the pump than properties of each injector. On some, they didn't chatter unless I pressed harder on the pump handle.
Reply With Quote
Old 06-01-2014, 12:52 PM
Registered User
Join Date: Sep 2007
Location: Calgary Alberta Canada
Posts: 1,276
Thank you Bill I recall reading your post a long time ago but needed direction on how to find it again. But in my observations I seem to have hysteresis initial pop being at least 50 to 120 psi greater than maximum chatter pressure I may have to go to a data logger to capture this. My observations after many repeats seems consistent I would have expected something like your trends.

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 04:11 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, 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