Looks impressive.  I have questions about flow testing like this.  What is
the air-pressure we are working with here?

David Marshall - Volkswagen Enthusiast Quesnel, British Columbia, Canada

78 VW Rabbit [1.8L]
84 VW Westfalia with 105hp I4 [For Sale]
84 German Army VW Double Cab [For Sale]
87 Audi 5000 Quattro
87 VW Fox Sedan
88 VW Syncro Double Cab

David's Volkswagen Home Page
http://www.volkswagen.org
Fast Forward Automotive Inc.
http://www.fastforward.ca
-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com]On Behalf Of
Robert Donalds
Sent: June 24, 2001 7:15 PM
To: vanagon@GERRY.VANAGON.COM
Subject: WBX big valve heads and flow bench results

Fellow vanagon types

I have been building a 2.1 engine for my own 85 camper and along with the
usual upgrades of the reground OEM cam with more duration, a little more
piston skirt clearance and some major head work. I decided to try a set of
larger valves and larger harder valve seats. After all the work to get
larger valves and seats into a pair of AMC heads and doing the high flow
valve job I sent the heads out to have them flow tested on a flow bench. The
flow bench measures cubic feet of air moving threw each port at a given
valve lift. Some of you might recall that I had some flow testing done when
I started doing high flow valve jobs on stock heads with varying degrees of
porting work.

Flow bench test results
1 stock AMC head intake port
2 ported and polished AMC head stock valve intake port
3 Boston Bobs big valve AMC head minor porting

                 CFM.
-------------------------------------------------------------------
 Lift           NO.1intake  NO.2 intake  NO.3 intake
.050           24.8            33.0              34.8
.100           47.1            52.2              57.3
.200           89.6            91.4             108.4
.250         115.4           116.7            132.8
.300         125.3           128.5            145.8
.350         137.6           145.3            171.4
.400         144.9           158.8            181.3        this is above
stock lift but I thought it was of interest
.450         147.8           174.1            186.0        to Robert Lilly
.500         154.6           179.0            190.6

as you can see I am very pleased with the results.
I am tempted but wont be using ratio rockers
maybe a chip if they have them for the 85 fuel injection system next year
no dyno testing will be done unless your paying
no estimates of horse power wiil be offered
I am still installing the engine and will report on power when its sorted
out
at that point I will decide whether to offer the large valve heads on my
rebuilt
engines

Bob Donalds
http://www.bostonengine

as always all rights reserved