Quote:
Originally Posted by cmitchell17
Have you ever taken a look at the SAE paper GM published for the LT1 development? I had it around somewhere, it mainly talks about the trade offs they made to keep tumble and swirl up that sacrificed flow in areas for combustion efficiency.
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Yep, port velocity has a lot to do with that, making the port bigger you are lowering port velocity. While it may downflow great it might also hurt performance in other aspects and you undo the engineering work GM did for combustion efficiency but at the end of it the engine is an air pump make it easier to pump air you'll gain some power.
http://papers.sae.org/2013-01-1732/
http://www.c6registry.com/pdf/LT1%20...%2024OC12a.pdf