Hello Paul,
They are from Revmaster. I have one on the Pulsar with the 3300 Jabiru
in. It took some tuning but I was going through a learning curve. What
I know now it would take no time to tune.
The little bird photo is for Robbin.
Friday, September 29, 2006, 9:57:19 PM, you wrote:

Best regards,
  ddunbar                            mailto:ddunbar@echidna.id.au--

Thanks for the pictures Don.
What are you going to use for the center ports?
Those TIB's might be useful for P-ports.

Paul Lamar

On second thought the 40 mm (1.57") size is still marginal
for a p-port. The price seems right however at $320 for
a 34 mm version. Too bad he does not make a 51 mm version
for P-port rotaries.

http://www.revmasteraviation.com/products/revflow_injector_carburetor/index.htm

Paul Lamar ...No rotor no motor.

Hi Paul;
One thing people could do is to provide a taper after (and possibly
before) an undersized
carb or any other restriction in the intake system.  This should be able
to recover most of the
losses in the system due to the restriction as long as the sizes are not
too far apart.  40 to 51mm
should be do-able.
Hoerner rule is roughly 6 degrees or a slope of 1/10.  This would be
(51-40) = 11mm/2
= 5.5mm x10 = 55mm=~2.2in length for the taper - I have heard talk of
slower tapers
but never results.
Cheers
Cary

Cary,
I am doing my own slide carbie and through the process I stumbled upon an
old message in which you contributed the above statement.

My research on carbs has revealed that motorcycle and aero carbs have
variety of Venturi, ranging from Zero mm reduction ( no Venturi) to 7mm and
8mm reduction.

The higher the reduction the bigger the Vacuum signal ( especially needed
for low rpm- idle) and the bigger the restriction, the lower the reduction
the lower the vacuum signal  and the lower the restriction.

Some carbs use no Venturi and depend upon the vacuum created by the low
pressure of a flat ground throttle needle. This is the method I will be
using and is the best IMHO, for my application.

My question to you is on the Hoerner rule you mentioned, I can't seem to
find reference to this which might apply to a Venturi! Can you elaborate
further on this please?

My own research suggests that the best Venturi for max signal is 11.5 to 12
degree inlet wall ( convergent entrance) and 3.5 to 4mm outlet wall
(divergent Outlet).
George (down under)


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