Quote:
Originally Posted by ksa8907
a ported and polished head/combustion chamber is still the best.
a more efficient burn gives more power, win-win.
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For power sure, but this is ecomodder.
Quote:
Originally Posted by Frank Lee
"Swirl" and "Tumble" were all the rage in the engineering circles at that time.
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Thats kind of what I was wondering... was it a fad and marketing nonsense, or was it a radical step up vs past solutions? What about now (since everyone is so power hungry and I rarely see mileage improving each year in most vehicles, most 10 year old listings show the exact same figures), did they go for more power or are newer powerful heads just as efficient?
Quote:
Originally Posted by Old Tele man
Swirl, tumble, etc., are all air movements at the control of their physical & atmospheric environements.
"Injection" however, is under the control (within limits) of the computer, ie: it does a far BETTER job of air/fuel mixing than did the old mechanically derived "head swirl/flow tumble."
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Thats kinda what i'm wondering, unless there are diverging opinions...
Is the consensus that the new 4.8/5.3 type engines should produce BETTER efficiency (dont care about power) at the same part throttle load than older swirling everything type heads?
Quote:
Originally Posted by drmiller100
They are the greatest thing ever until you see the 5.3/6.0 heads and look at the numbers of what they can do.
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Could you expand? I'm not an expert in any of the newer designs, only older small blocks. Again remember i'm mostly caring about mileage, not ultimate power, to include mileage under differing levels of load. (ie moderately higher towing loads but not full throttle is an example)