Quote:
Originally Posted by Paul Workman
But, on the other hand, the GEN-II LT5 has siamesed runners, a single injector per cylinder, and made close to 550 hp at the FW.
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One has to be very careful drawing a comparison to the Gen-III engine, which indeed did feature a single intake runner per cylinder. That manifold and intake port were designed from the outset as a single hole--it is not as wide side-to-side as two separate holes with a divider in between.
When one makes our design injector housings "Siamese", you are dramatically changing the cross-section area of the manifold runner. And it doesn't necessarily flow more than a properly ported 2-hole design. I have airflow data showing a ported 2-hole design approx. 36mm each outflowing a maxed out fully siamesed housing.
I am a believer in keeping the correct port velocity through the whole intake tract. Not everyone subscribes to that--a lot of "bigger is better" out there. That's ok, different courses for different horses, or however that saying goes.