Yeah, Mike, he certainly put the design to use on his infamous "7/8-scale" '66 Chevelle race car... But even before that the design was employed on early-60's Chevy racers, too. I distinctly remember seeing one on a '63 Impala back in the day.
Chuck on 2/9/04 10:42 AM, mike f at [EMAIL PROTECTED] wrote: > Chuck and all. > I thought I saw this in an old CHP magazine. So during > the holidays, I dug a years worth out and looked but I > did not find it. I rememberd something about this > firewall-aircleaner assy made by Smokey Yunick for the > 67 chevelle NASCAR car. Does that sound right? > > Mike Fry > > --- Chuck Hanson <[EMAIL PROTECTED]> wrote: >> on 2/4/04 10:11 PM, tom at [EMAIL PROTECTED] wrote: >> >>> I got the latest issue of Chevelle World with the >> article about installing a >>> cowl induction setup through a hole in the >> firewall (Rudisill's cowl plenum >>> system). I also noticed that John Bedenbender's 66 >> Elky >>> >> > http://www.midwestchevelles.com/past_shows/mw2002/66elky.htm >> had a similar >>> cowl plenum arrangement through the firewall >> (pretty cool). Some articles >>> about cowl induction on the web said that the cowl >> induction intake should >>> be 1" or more above the hood line since air flow >> at the hood line was low. >>> If this is the case, could there be an air flow >> problem with intake through >>> the firewall, which I assume gets its air through >> the cowl grate which is >>> below the hood level? >>> >>> Tom Tomlinson >>> '71 Malibu >>> '66 El Camino >>> >>> >> Tom, >> Somewhere in the article I'm sure I mentioned the >> fact that a high pressure >> area exists at the base of the windshield. Smokey >> Yunick may not have been >> the first to figure it out, but he sure put that >> theory to practical >> application, and if you peek under the hood of any >> NASCAR racer you'll find >> that essentially the same system is still put to >> use. The pressure >> differential at the base of the windshield is also >> the same reason that >> Chevrolet configured the '69 Camaro and '70-2 >> Chevelle Cowl Induction >> packages like they did. >> >> The cowl plenum system that Rudisell is offering >> duplicates the >> over-the-counter package that Chevrolet offered >> during the late Sixties, to >> help improve on- and off-track performance of >> serious Chevy competitors. >> I've seen them installed on Camaros, Chevelles, >> Novas, and even full-size >> Chevys. >> >> The discussion of airflow over the surface of the >> hood is a bit out of >> context for a true "cowl induction" setup, because >> the high pressure at the >> base of the windshield is quite adequate enough to >> yield a "force air" >> effect. The notion that the intake location should >> be at least an inch >> above the hood's surface applies most directly to a >> forward facing "scoop," >> and placing one in that location (at least an inch >> above the hood's surface) >> increases its effectiveness substantially. An even >> better solution for a >> forward facing scoop is to locate it at the leading >> edge of the hood, much >> like the Olds 442 setups of the early Seventies. >> >> The rearward facing scoop on the second-generation >> Trans Ams, however, were >> minimally functional at best... and purely cosmetic >> at worst. The location, >> elevation, and direction of the "scoop" all >> conspired to reduce its >> effectiveness considerably. They did "shake" >> whenever the engine was >> throttled, however, and DID LOOK pretty cool. I >> also question the >> effectiveness of the Mopar and Ford "Shaker" scoops >> of the same era. At the >> very least, they did allow a cooler, denser charge >> of air into the engine, >> although it had to be sucked in rather than forced >> in by using nature's >> physics to accomplish the job. >> >> My '69 L89 convertible has been finished since last >> June, and the cowl >> plenum setup is a definite attention-getter at all >> the shows and cruises >> I've taken it to, not to mention the unique wail >> that emanates from the >> firewall opening every time the secondaries are >> called into action. It may >> not be for everybody, but for me it was the perfect >> complement to my '69 SS! >> Those of you who watch HorsePower TV will get a >> quick peek at it in a week >> or two... >> >> Chuck >> >> > > > __________________________________ > Do you Yahoo!? > Yahoo! Finance: Get your refund fast by filing online. > http://taxes.yahoo.com/filing.html >
