Don Dunbar wrote:

Hello Paul,

  Thanks Paul for your comments on the Renesis intake, as there are
  six ports how long would you make the runner.
  I was thinking of using two throttle bodies that I could use
  different intake timing to suite the port timing. Do you think there
  is anything to gain.

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

My guess is 14 to 16 inches. I think you could probably combine
the two runners in each end housing into one if you did a bit of

streamlining

in the end housing as per these two pictures. That would make four
runners total into one plenum with one large throttle body.

The reason Mazda uses two separate runners on the end housing (six total)

is one each

is shut off at low RPM. I think you will get a bit more power at 7250 if

you

combine them into one. Four total.  Figure the area by adding up the area

of the two

outer ports and make the outer runner ID area the same. My guess is 30 mm

ID.

Paul Lamar

Don,
Do yo have the original intake manifold - if not I've found that Mazda
allows about 20 % extra in the tube size (compared to the actual intake in
the motor), allowing for drag in the tube I assume.
George (down under)

 
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