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
&nbs=
p;
CFM.
----------------------------------------------------------------=
--- &nbs=
p;
Lift =
NO.1intake NO.2 intake NO.3 =
intake
.050 =
24.8 &nb=
sp;33.0 =
34.8
.100 =
47.1
52.2 &nb=
sp;
57.3
.200 =
89.6
91.4 &nb=
sp; 108.4
.250 115.4&=
nbsp; 116.7&nb=
sp;
132.8
.300
125.3
128.5
145.8
.350
137.6 14=
5.3 &nbs=
p;171.4
.400 =
; 144.9 &nbs=
p;
158.8
181.3 this is above stock lift =
but I
thought it was of interest
.450
147.8 17=
4.1
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
as always all rights =
reserved