Quote:
Originally Posted by batchman
I would think the separation between runners would become important with respect to cam timing of the two valves - do they open in unison (stock cam) or is there a difference in cam timing?
- Jeff the curious, who will wind up with exactly one chance to get it right and still meet class rules....
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This is a good question - the reason I asked if anyone has done flow test on the bench OR IN A LAB.
Airflow through the tubes - just like water flow - has dynamics - AEROdynamics. The column of air has LAMINAR flow - momentum, going through the tubes.
Introduction of turbulence can create eddies. But, DEPENDING on where it is in the intake mechanics, it can be good (think of GM's VORTEC induction), OR, it can be 'not beneficial'.
And I say 'not beneficial', as opposed to BAD, conditionally; with some reservation here.
Making a bigger hole WILL allow more air, which without question, will benefit an engine with the hammer on the floor.
But what about mid-range? And low end?
Best example that I can think of, is L98's intake manifold. Flow characteristics of L98 intake are 'templated' on flow characteristics of an LB9.
L98 loses out top end, NOT because of the VOLUME THAT THE INTAKE ALLOWS, BUT BECAUSE OF FLOW DYNAMICS.
Another example came from another forum board - discussion of the 'Foil', on the throttle body. After thinking on it - how it would stop air from 'bouncing' (turbulence), off of the OEM TB divider (of the 2 TB openings), made me think further on it's benefits. Throw a rock in a pond, and watch the waves 'bounce', AND COME BACKWARD EVEN, WHEN THE WAVES HIT THE "No Fishing" sign. Then I posted that in a forced air induction system, it should REALLY be beneficial, to reduce the 'bounce'. User 'Joe', whom some of you probably know, after lurking about, posted up 'Bingo', on the forced air induction/ benefits.
A true MONOrunner plenum has dynamics already considered.
So I'm asking again here; has anyone done flow dynamics tests,
of any sort, on OEM vs 'siamese-d' tubes?
Or even, Before and After TQ/HP numbers???