This thread is to Tune the VW Plenum manifold to get Maximum Torque and Horse Power out of our Single carb. manifold system,
and get rid of any hesitation, or bogging, that is not related to the carb itself,
And find out what works best.
To provide a bike that can get away from a Dead stop, very well.
I am working on a Venturi, that is Loosely based on CM85's Venturi, and according to him, he got this info from Tom the GM engineer, at Langdon's Stovebolt it will have a tapered squish down area it's whole length, for speed up and mixing of air/fuel charge.
I have one done as of now.
1.050" ID Smallest opening of the Venturi, this is the last 1" of the venturi, right before the 90 degree bend going into the head
You are seeing the VW plenum Outlet end you can see that it tapers three times, and has Four ID size changes, 1.300" ID x 3/4" long then 1.170" ID x 2.0" long, then 1.050" ID x 1.0" Long and back to 1.300" ID.
A look inside the completed Venturi
You are seeing 1.300" x 3/4" long then 1.170" ID x 2.0" long, then 1.050" ID x 1.0" Long
and get rid of any hesitation, or bogging, that is not related to the carb itself,
And find out what works best.
To provide a bike that can get away from a Dead stop, very well.
I am working on a Venturi, that is Loosely based on CM85's Venturi, and according to him, he got this info from Tom the GM engineer, at Langdon's Stovebolt it will have a tapered squish down area it's whole length, for speed up and mixing of air/fuel charge.
I have one done as of now.
1.050" ID Smallest opening of the Venturi, this is the last 1" of the venturi, right before the 90 degree bend going into the head
You are seeing the VW plenum Outlet end you can see that it tapers three times, and has Four ID size changes, 1.300" ID x 3/4" long then 1.170" ID x 2.0" long, then 1.050" ID x 1.0" Long and back to 1.300" ID.
A look inside the completed Venturi
You are seeing 1.300" x 3/4" long then 1.170" ID x 2.0" long, then 1.050" ID x 1.0" Long