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  1. rtj

    Internal Body Aerodynamics

    That large vertical looking “wing” behind the front wheels is probably responsible for the side skirt area (rocker area) being so different from the c6 or c7. Jim is right, vortex dominated flow down the sides. Well it speaks volumes about how much trust your customers have in your work...
  2. mfain

    Internal Body Aerodynamics

    ...see examples of some of the things we have been discussing - waterfall hood openings, cut-outs behind the front and rear tires, extreme side skirts, etc...
  3. phantomjock

    Internal Body Aerodynamics

    ...car - fill and shape the interior like a tunnel/diffuser. Or build it lower in front so it has a natural rake. Remember to add the side skirts inside and out. Again, easy to build and replace -- like your rockers. Easy to test with a few pressure taps too. Yes - and Yes. Keeping the...
  4. BBShark

    Internal Body Aerodynamics

    Incredible workmanship and engineering!
  5. mfain

    Internal Body Aerodynamics

    Hey Jim, I have the tunnels/belly pan/diffuser off the car right now doing some undercarriage work, but I was able to take a couple of photos to show how the diffuser tunnels are set up. The sketch shows how the tunnels blend into a rounded leading edge that is actually an extension of the...
  6. phantomjock

    Internal Body Aerodynamics

    ...this makes sense - can't say its CFD - just one guy's opinion/idea of what might be going on. Cheers - Jim BTW - I did run the SR with side skirts (not authorized - but if you ain't cheatin"...) and the car was very well balanced and like riding on rails. Removed them and have ran with...
  7. mfain

    Internal Body Aerodynamics

    Interesting. The side pod diffuser tunnels that they show as banned early in the video are what I have on my '56 - between the outside of the frame rail and the inside of the side body skirt. I have the rear wing adjusters on a bellcrank assembly with the future possibility of adding an...
  8. S

    Stahl Sbc headers

    Hi Jim, Do you happen to remember where you purchased these Stahl 180 headers? I contacted them and the gentlemen I spoke with said they never produced anything like that. Any info you could provide on these would be greatly appreciated. Thank you, Tim
  9. rtj

    Internal Body Aerodynamics

    Make new rocker moldings out of thin aluminum which are 1 to 2 inches longer. This will act as side skirts keeping flow out from underneath. Lower is always better for side skirts. Creative use of black paint could disguise how low they are. Also, the spare tire area is a mess, a diffuser...
  10. SuperBuickGuy

    Plastic Fantastic 2

    If I had seen that silver car before I painted mine... that's gorgeous... maybe the next car (ha). The green C3 at Optima had basically that (without the hinge) flap screwed to its rear spoiler... I was too busy with my troubles to watch him run - but I've watched (you?) with the yarn taped all...
  11. phantomjock

    Internal Body Aerodynamics

    ...be a heap of drag saved - we've been over that before - but I need to repeat so I don't forget (getting to build again soon.) Regarding side skirts. First there are a lot of "odd things" you could see/say about this car. But he's got the radiator exit on hood, side exits ahead of front...
  12. vette427sbc

    Internal Body Aerodynamics

    Your CFD makes total sense! Thank you for the explanation. Again, this makes much more sense :thumbs: These are pretty wild cars... I typically like “raw” cars; lots of hp and a well balanced chassis. Not much more. I think this up there with my favorites though! And I definitely get an...
  13. phantomjock

    Internal Body Aerodynamics

    ...an airfoil section - just straight, flat ceilings. Butt dyno says it works well. Plan has foam and glass inserts, not built yet. I had side skirts (Chaparral-style) and that was like the car was literally on rails. They were 2 inch aluminum, and Tech missed seeing them as we teched on...
  14. mfain

    Internal Body Aerodynamics

    ...with an effective, properly designed (not just cosmetic) diffuser helps a lot, as does a belly pan to clean up airflow under the car. Side skirts keep air from rolling under the car and causing lift. One of the best cooling/downforce aids is to route exhausted radiator air up through the...
  15. phantomjock

    Internal Body Aerodynamics

    Pappy - Nice pic with a lot to digest, so I'll guess...(or bloviate) I'm thinking that the dual canards are acting as "vanes" and not only creating downforce (vectoring the flow), but also making an "air curtain" to blanket flow just outside the wheel. Yep, that would create a low pressure...
  16. rtj

    Internal Body Aerodynamics

    I was thinking, a c2 or c3 with sidepipe exhaust could run an L-shaped “heat shield” to get side skirt splitter effects. If done right, might not look bad.
  17. 69427

    Internal Body Aerodynamics

    I've often wondered about the sharp edge shape there. I hope you're correct, as that's an easy piece/shape to fabricate. Years ago I replaced my short height rocker panels with longer (lower) pieces of Lexan (painted black), as I hated the side view with the transmission crossmember visible...
  18. COLE SWEAT

    Internal Body Aerodynamics

    Are you running a rear sway bar?
  19. 69427

    Internal Body Aerodynamics

    No. I'm running the '84 Z51 rear spring, so I've got plenty of rear roll stiffness. I've been focusing my efforts at changing the front suspension geometry to improve the front grip.
  20. phantomjock

    Internal Body Aerodynamics

    Those side skirts are well done too. Liking the feed to the rear wheels and then integrating to the tunnels. Kool.
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