Quote:
Originally Posted by Fred68
Pretty much anything that is bolted to the exhaust or inlet ports of an engine will loose torque.
A correctly designed manifold will or can cause a vacuum in the exhaust port. This vacuum will draw extra air into the cylinder via inlet valve. This does add torque over and above that, that is generated by open ports.
This extraction only works for a set design of manifold. Any other type of compromised designed does in fact loose torque, when compared to open ports.
The JS manifold is much better in terms of flow over the standard manifold. This is why there is a torque gain.
It's not the last word in extraction manifolds for the KV6 though.
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Right ok, so I should have a net improvement over the MGR units with my JS manis?