H Dave,
That should be an interesting study...I would be interested in seeing the
results..... In modern manifolds, the pulses cause the "ramming" effect
which utilizes the inertia of the flowing fuel mixture to squeeze additional
mixture into the chamber thereby effectively increasing the dynamic
compression. I installed individual runners with Webbers and then flow
benched them along with the head to ensure the maximum flow and
ramming....of course the camshaft is selected to maximize the result also.
I'm curious if the waves sent back into the manifold upon valve closure
offset the benefits of the inertia created by the vacuum from the same
cylinder.
Good luck.
Paul
-----Original Message-----
From: healeys-bounces@autox.team.net [mailto:healeys-bounces@autox.team.net]
On Behalf Of David Masucci
Sent: Wednesday, June 01, 2011 12:52 PM
To: healeys@autox.team.net
Subject: [Healeys] BJ8 Intake
Hi Listers,
For reasons I can explain later, I am doing some computer analysis on the
behavior of the BJ8 intake tract as it applies to the dynamics of the
airflow. Specifically I'm looking at modeling the behavior as the pulses
caused by valve closure send waves back into the manifold. I'm looking at
how it behaves compared to modern "tuned" runners/plenum manifolds.
To complete my model I need one more bit of information. Its clear that the
front 3 runners and plenum section is a mirror image of the back 3. Does
anyone know if the front and back of the plenum section (the rectangular
box) is separated by a wall or septum? Or is the front and back wide open.
Thanks,
Dave
BJ8
Sent from my Verizon Wireless BlackBerry
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