Vanagon EuroVan
Previous (more recent) messageNext (less recent) messagePrevious (more recent) in topicNext (less recent) in topicPrevious (more recent) by same authorNext (less recent) by same authorPrevious page (December 2001, week 3)Back to main VANAGON pageJoin or leave VANAGON (or change settings)ReplyPost a new messageSearchProportional fontNon-proportional font
Date:         Thu, 20 Dec 2001 08:09:06 -0800
Reply-To:     Doktor Tim <doktortim@ROCKISLAND.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Doktor Tim <doktortim@ROCKISLAND.COM>
Subject:      Re: Boston Bobs day at the dyno
Comments: To: Robert Donalds <bostneng@FCL-US.NET>
In-Reply-To:  <00f301c1896a$9494c140$77810fce@vern>
Content-Type: multipart/mixed; x-avg-checked=avg-ok-2880DA4;

At 10:25 AM 12/20/2001 -0500, you wrote: > >fellow learkers and so forth mores > >I spent the day testing vanagons on a chassis dyno with mixed results. The truth of the matter is that everything I thought I observed by the seat of the pants method was wrong. First on the dyno was the big valve engine in my 84 camper first run to warm the engine up made 50 hp at 3000 and a max reading of 77 hp at 4600 RPM thats a nice start but the air fuel ratio was a little >now get back to work >B.Bob Donalds

As you know, bolting on non-stock parts is folly without much testing and refinement, moving you into necessary systems engineering. Without the expense of empirical testing for factual data, seat-of-the-pants will bias towards telling the ego it's a genius for being so wise as to spend time/money and claim improvement. Such are all testamonials that sell info-mercial merchandise.

I say stock ist beste because it is by far easier to get results by sticking to factory proven system engineering. If stock isn't good enough for you, re-consider what you need/want that stock can't provide. If you have the budget to pursue new knowledge, God bless you and thanks for the new data. If you don't, don't start by assuming the testamonials are true. You sure can lunch your motor with some aftermarket bolt-on wizbang.

I would suggest that you consider testing with AFM's for larger capacity engines and/or higher volume flow injectors to get the stock FI delivery rate up to match the needs of the higher flow rate of larger valves with higher lift. Don't forget how very critical a matching exhaust flow will have. Custom intake requires custom balanced exhaust to really enhance flow volume. Not enough or too much back pressure can render you untunable for clean running under all loads and rpm's.

Compare your research facilities and budget with the factory and you get a sence of the difficulty involved in doing the factory one better, at least in regard to drivability and longevity. How many years of study and refinement did it take for you to come up with a better valve lifter adjustment procedure??? And that was merely a refinement of stock procedure, not adaption of a non-stock part. It proves there is room for improvement of factory procedures in very limited cases. The synergy of stock systems function is typically upset by changing just one of many parameters so without complete matching of all system components the result is most often a loss of efficacy in some result. T.P. Stephens Doktor Tim's


---

Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.303 / Virus Database: 164 - Release Date: 11/24/2001


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.