Paul,
I am thinking about putting a 13b in my 1978 VW camper. I am going
to use side intakes. I don't need the power of p-porting.
I thought that I could do a slide throttle and extend the tube out
even longer to bring the torque curve down to a reasonable rpm for the
bus transmission. Do you think that I could get the peak torque down
to 5000 rpm or less?
My purpose is to have something to experiment with while I build
the plane. It also would be my justification to have a VW Bus that
will go up mountains like no other.
From the torque curve picture:
Assume +175 extension is at full extension
and that the intake is fully contracted in the drawing.
Also assume 175 is millimeters.
if A = 175mm then C= and A+B+D=573mm = ~22.5"
A different route:
Assume the inside diameter at the port is 1 7/8".
if C = 1.875" then A+B+D = ~22.5"
--
Blake C. Lewis
RV8 N698RV reserved
Hey that ought to out last the VW engine 100 to 1.
Put the coolant rad up in the front and you will get a real heater
in the bargain.
Use the 25 CM number to scale everything else as that is the most
accurate number in that drawing.
The tuned length is not necessarily the same when you change pipe
diameters. This chart on that subject is from Heinz Heisler's book
Advanced engine technology. It is a good starting point however.
My guess is make them as long as possible and then you can shorten
them with hose and hose clamps if necessary. Also don't bother with
a slid throttle. Just use the stock throttle body, mass airflow sensor
and EFI system. Perry Mick has done this on his airplane and he can give
you a few tips on the subject. Tracy's system won't work well enough
for automotive use.
BTW Parallel port cards are on the way. You should get them this week.
Paul Lamar
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