Vanagon EuroVan
Previous messageNext messagePrevious in topicNext in topicPrevious by same authorNext by same authorPrevious page (September 1998, week 3)Back to main VANAGON pageJoin or leave VANAGON (or change settings)ReplyPost a new messageSearchProportional fontNon-proportional font
Date:         Sun, 20 Sep 1998 20:21:38 -0400
Reply-To:     Martin Jagersand <jag@CS.ROCHESTER.EDU>
Sender:       Vanagon Mailing List <Vanagon@vanagon.com>
From:         Martin Jagersand <jag@CS.ROCHESTER.EDU>
Subject:      Injection pump book tip.
Comments: To: VWDIESEL@PAS-NT.PAS.ROCHESTER.EDU, vanagon@vanagon.com

I just read through a new edition (1994) of Bosch's "Diesel fuel injection" book. I can definitely recommend it. Has a good chapter on the basics of the various Diesel designs, a chapter on exhaust emission, and what can be done to lower them and last but not least the latter part of the book is devoted to the VE injection pump in the VW vans and cars.

It's interesting how little the VE pump has changed in the last 25 years. Essentially the same pump was in the first VW diesels in the 70's as is in the newest TDI's! In fact in a sense the TDI pump is simpler than the older ones. A lot of the mechanics regulating the control sleeve (governor, boost and altitude aneroids) have just been replaced with a simple solenoid (and the functions are now computerized.)

The only other substantial change is that the timing advance is now both load and speed dependent by means of a small solenoid leak valve in the timing regulator. This makes the new diesels quieter in normal operation. Max advance occurs only at full load.

Ever wondered how the TDI two stage injection works? It's in the injectors, not the pump. The injectors have two springs with two opening pressure settings. The pre-injection opens first, the the main injection.

And for those power and speed nuts, Bosch specifies that the VE pump (I assume any basic VE) can be tuned up to deliver 25kW/cyl. (You supply the air ;-)

/Martin -- Martin Jagersand email: jag@cs.yale.edu Computer Science Department jag@cs.rochester.edu Yale University

Slow down and visit the VW diesel Westy page: WWW: http://www.cs.rochester.edu/u/jag/vw -------------------------------------------------------------------


Back to: Top of message | Previous page | Main VANAGON page

Please note - During the past 17 years of operation, several gigabytes of Vanagon mail messages have been archived. Searching the entire collection will take up to five minutes to complete. Please be patient!


Return to the archives @ gerry.vanagon.com


The vanagon mailing list archives are copyright (c) 1994-2011, and may not be reproduced without the express written permission of the list administrators. Posting messages to this mailing list grants a license to the mailing list administrators to reproduce the message in a compilation, either printed or electronic. All compilations will be not-for-profit, with any excess proceeds going to the Vanagon mailing list.

Any profits from list compilations go exclusively towards the management and operation of the Vanagon mailing list and vanagon mailing list web site.