Quote:
Originally Posted by racprops
So why would GM spend all the money in developing a Swirl Port head.
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Interestingly your comment that these were developed by GM got me looking into them. From what I can tell, they don't have anything to do with swirling but rather have a ramp that leads to an edge. What's the most interesting thing is that there are also similar ramps in the videos I mentioned above. Ramps with sharp edges can help launch fuel that's flowing along the intake track back into the air stream.
https://garage.grumpysperformance.co...t-heads.10579/
Quote:
Originally Posted by Ecky
I think racprops has a point, in that, while some techs benefit both power and efficiency, they are just as often add odds with one another.
Faster combustion, due to clever combustion chamber design? Improves both.
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So do ramps and other clever intake tract and combustion chamber designs that help atomize fuel.
Flinging fuel onto the cylinder walls where it won't burn is also bad for both.
Also distributing the fuel throughout the air as homogenously as possible with maybe a bit more richer near the spark plug and leaner away from the spark plug can also benefit both.