Hello Volks,
There has been some discussion on the =
list lately
about the Digijet vans and the 5 degree atdc timing.
I run my van at 2 atdc and it runs fine =
for me,
power is fine and 18 mpg summer.
I was curious about what the total =
advance would be
with this close to stock setting.
So when I found a free hour and =
1/2 today I
took the spark plugs out so it would be easier to turn the engine over.
Then I found my plastic compass =
with degree
markings on it and marked the very rear pulley at 30, 35 and 40 =
degree's. It had
a factory mark on it already that looked to be close to the Top =
Dead
Center . ( I have the power steering pulley.)
After I had marked the pulley and put =
everything
back together I started the van and warmed it up. I had all vacuum =
hoses
in place and the idle stabilizer in service.
At idle I still had 2 atdc. =
At 1500 rpm
I had around 7 btdc. At 2500 I had 30 btdc. At 3000 I had 45 =
btdc.
My only uneasiness in this report is =
that it is
somewhat difficult to find tdc on the rear pulley by using a =
straight edge
and eyeballing it, but I wouldn't think I would be that far off. I was =
only a
couple degrees before the factory mark on the rear pulley when I used =
the
compass to mark the rear pulley. And from my experience building engines =
I would
assume the mark on the rear pulley would be TDC if the pulley is keyed =
on the
crank.
I had taken my distributor apart a year =
ago when I
had idle surging trouble, so I assume the centrifical parts are ok. =
Springs in
place and weights lightly greased.
If other people would run this =
test sometime,
it would be interesting to hear your results.
peace,
Mark Ingalls
Nebraska City, =
Nebraska
85
Vanagon GL 'Aimee Airheart'
75 =
Beetle
'Salvation'