snipss...
Before I decided whether to cut up my Renesis throttle body, I asked
Tracy if he might be planning to make a fly-by-wire controller for
thisTB. I hope he won't mind me repeating that this is in the
works: a
redundant controller to allow use of the stock TB. He said it will be
posted on the RWS website when available. The downsides will still
include a single-point failure at the TB, and that it is currently
spring-loaded to fail in the closed position.
When considering the type of short manifold as in this thread, is it
reasonable to keep the injectors in the stock positions, which would
greatly simplify building the intake system?
Also, is it possible to make a reasonable bell mouth by porting out
thecut edge of the lower intake manifold (as in these pics) as it
entersthe plenum and the bottom plenum plate? Or would it be
necessary to
install some short velocity stacks that stick up into the plenum?
i.e.,what is the minimum radius or shape of a bell mouth, such as
Paul used on
his cast runners?
Scott Gettings
Install velocity stacks sort of.
I think a 3/16 inch radius or greater would work fine. I have a
bunch for two
inch tubing P-port tubing but that would not work for the stock
RX8 engine intake as it has six smaller diameter runners.
Here is a recipe for making some to fit the Mazda runners on a lathe.
Take some bar stock and bore it to the ID of the
runner in question and with a 1/2 inch wall to about 1/2 deep.
Then use this 1/4 inch radius tool to radius the edges. Part it off
and weld it to the bottom plate in the plenum.
Have a bunch made on an NC lathe and sell them to other RX8 guys :)
Paul Lamar ...No rotor no motor.
Great info., thanks. I can make this happen.
Is there any performance disadvantage in keeping the 6 injectors in
their stock positions (lower intake manifold and engine housing) instead
of closing up these ports and injecting into the plenum chamber?
Scott Gettings
Not so you would notice with this type of manifold.
Keep them were they are and you can use the stock fuel
rails and some of the fuel plumbing.
Paul Lamar ...No rotor no motor.
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