Drag Racing Discussions > Front Engine Dragsters

Zoomie size?

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glofria:
When it comes to air flow, the smartest guy I know (my dad) told me once there is no advantage to stepping the tubes and velocity will increase with bends.

cad500justin he's seen you car and thinks it cool. If you call him and tell him what your doing he would gladly give you some free advice.

Larry @ Valley Head Service (818) 993-7000

wideopen231:
With zoomies no advantage. With collector headers there is some power gain. Not opinion but actual dyno. We did a 565 and header change from 2" to 2 1/8 motor gained 8 hp. Changed to  2 1/8,2 1/4 to2 3/8 step headers motor gained almost 20 hp. Then richened motor and picked up few more. Now was 1000 hp engine. May not be worth as much on lower power engine.

THE FRENCHTOWN FLYER:
On a related question: Has there ever been a R&D dyno effort to see if "D-shaped" bends help on zoomies, similar to the D-port configuration on many exhaust ports in cylinder heads? I remember a text book I used many years ago to teach an auto shop class that extoled and explained the virtues of a D-shaped exhaust port. It is not a new concept. How about applying D bends in zoomies, or any headers for that matter?

glofria:
Air will always flow with more velocity on the outside of a bend. The inside is more of a dead air space.

My dad (proud son I am) worked with Smokey Yunick back in the 60's and did a lot of testing on the flow bench. One of the concepts that came about is the "D" shaped exhaust ports and why you see them as cocked on big block Chevy heads.

NOTE: after rereading what I typed, some corrections made.

THE FRENCHTOWN FLYER:
So my question still stands - if D-ports work on heads (which I readily admit it does) why don't we find the concept on header bends?

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