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HybridZ

RTz

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Posts posted by RTz

  1. ...I do know for fact that you gave a certain someone inside info regarding the subject, so yes, you were involved, aiding and abetting! BUSTED! sherlock.gif

     

    Wrong again. If you'd engage that enfeebled brain of yours, you'd figure it out :mrgreen:

     

    The answer is right under your nose :wink:

  2. Monzter was able to calculate individual runner CFM.

     

    1. 129

    2. 170

    3. 156

    4. 141

    5. 136

    6. 138

     

    These correlate well with the pictorial view in the previous post.

     

    A runner-runner disparity of nearly 32%. Ouch.

     

    Here's the crux... these are static flow numbers and an intake is anything but static. Valve events and acoustics play a significant role in manifold function.

     

    For example, a friend of mine was relaying a story of intercooler flow testing, using an inlet 90 degrees to the core such as below....

     

    Backflow.jpg

     

     

    They found that the air passing by the first row's actually created enough negative to cause backflow through the core. The CFD on my manifold shows a tendency to do this as well.

     

    However, a large number of 'successful' manifolds are built with a 90deg. entry, both OE and aftermarket (Ferrari, Porsche, Lingenfelter, etc, etc). That, in itself, isn't definitive proof, but it does build suspicion that static flow is only a small part of the picture... in fact, it may be so skewed as to be nearly useless.

     

    Maybe some testing would shed some light...

  3. Monzter was kind enough to run a CFD analysis on the proposed plenum revision. The goal was to improve three areas... entry into #1, 3 and 4, while reducing the swirling mid-plenum. It seams reducing the swirling was the only item that became 'reality'... it was also of my least concern.

     

     

    Velocity chart at 20psi...

     

     

    20psi_velocity.jpg

     

     

     

    Thanks again Monzter!

  4. It may be a stupid question for some guys but, what dose LT1 and LS1 mine?

     

    BOOKS have been written on the differences. In a nutshell, the LT1 is largley based on the original iron small block Chevy, and the LS1 is a cleen-sheet aluminum redesign by GM. There is almost no technical relationship between the two.

     

    Do some Googling... It'll keep you busy for a while.

  5. I realize that this is not to be considered a replacement for a wideband. I am just looking for a cheap way to get a rough idea what the AFR's are in my engine. This would not be for tuning as much as troubleshooting.

     

    Bobby,

    I gotta play party-pooper here. The intention of this thread is advanced tuning. Its a good topic and I'd like to see it stay on that track.

     

    Grumpy,

    I'm moving this to Fuel Delivery.

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