All this talk about vortecs..
Drifting
Joined: Jan 2006
Posts: 1,832
Likes: 38
From: Cedar,BC
Not vortecs,but look like a good deal if you are close to this guy...
http://www.4m.net/showthread.php?t=153807
http://www.4m.net/showthread.php?t=153807
Le Mans Master
Joined: Oct 2002
Posts: 7,098
Likes: 378
From: Las Vegas - Just stop perpetuating myths please.
Thx for the compliment!
So tighter chambers can make more power even with lower flow numbers. Then i really do have amazing technical knowledge! Hurray!
And i see my admirer continues to quote Vizard from a different reference than i provided. Well he needs some quality time to himself so we'll let him read on until he finds it.
Regardless i'm guessing the OP and others have received the concept now for the heads he was considering.
Good luck timgman,
cardo0
And i see my admirer continues to quote Vizard from a different reference than i provided. Well he needs some quality time to himself so we'll let him read on until he finds it.
Regardless i'm guessing the OP and others have received the concept now for the heads he was considering.
Good luck timgman,
cardo0
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
There are a ton of factors beyond just the "open-ness" of the chamber. Heck, the D-shaped chambers on "smog" heads are VERY "open"...and the chamber shape alone will dump 25HP or more (per Vizard). Take an AFR or Trick Flow head and look at the shape for a bit - it's facinating and clearly requires a level of engineering skill and testing that can only be wondered at.
The Vortecs have the benefit of a ton of work by GM - keep in mind that better combustion = less emissions + better fuel economy; so we just get lucky that they make the iron Vortecs available so cheap. It's really the best entry-level iron head out there for the money.
Engine discussions are always kinda...spirited, as there's a lot of different experience and expertise out there. Broad generalizations are almost always going to hit a rock, as there are just too many factors to consider without getting into a specific build for a specific purpose.
The Vortecs have the benefit of a ton of work by GM - keep in mind that better combustion = less emissions + better fuel economy; so we just get lucky that they make the iron Vortecs available so cheap. It's really the best entry-level iron head out there for the money.
Engine discussions are always kinda...spirited, as there's a lot of different experience and expertise out there. Broad generalizations are almost always going to hit a rock, as there are just too many factors to consider without getting into a specific build for a specific purpose.
The vortecs have an advantage of the modern chamber design and a slightly raised runner configuration that helps flow. It straightens the path from the intake to the valve somewhat. A similar but not as drastic effect as changing from a 23 degree head to an 18 degree head. Straighter runners = better flow. Chamber and runner shape have much more to do with making power than an open or closed design. The aftermarket heads available now have computer designed chambers. They have flow modeling programs to actually "see" what the airflow will do both in the chambers and runners then the information is programmed into a CNC and the finished product is tested on a flow bench. You will find that the very best flowing heads have CNC chambers and runners because of this. They are light years ahead of what was available even when the vortec's were designed. AFR makes a 75CC head and a 65CC head. Chamber design is different on both. Both will make close to identical power with the same compression and build specs.
