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What I have drawn up is a manifold that has the runner length, diameter, and layout just like the stock Renesis manifold with all the valves open. It is rearranged slightly to lay flat against the engine to clear the cowl. It should weigh less than 3 pounds.
You can see that all the tubes do not join together at the same point. They went to some effort in the stock manifold to join the runners in this odd manner. I think it has to do with the pulses that travel back along the runners as the ports close. These "cross pulses" push air into the opposite rotor ports. Notice that the two secondary runners face each other directly, and join the main duct from the side. I think this is to enhance the cross pulse effect. A log manifold doesn't get much cross pulse action compared to this style manifold.
Bill Dube'
david mccandless wrote:
On 1, Aug , at 8:12 AM, Bill Dube wrote:
I think most of the HP in the Renesis is coming from the intake manifold design. If you put a "log" intake, you won't get the big HP that the stock tuned intake delivers.
Hi Bill,
my understanding of the Renesis intake manifold design is to boost the low speed torque to enhance drivability in the car. At 240 HP, the manifold is presenting 'tuned length' for 8000 + rpm.
If the "log" has tuned length intake runners for 8000+, then it will also make 240 HP.
FWIW, Dave McC
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