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
