One of the first cars to have cowl induction was the 63 Chevy 427 Z-11 It is the best place to take in cool air without increasing drag coefficient. NASCAR used it since 60s but in later years began to restrict size of openings which does result in lower HP. NASCAR trucks use a duel air hose design to the front grill area. NASCAR rules changed the hose diameter to 1 inch smaller and they lost about 50 hp. This is according to a NASCAR TV show I saw in the beginning of this season.
design ----- Original Message ----- From: "William King" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Tuesday, March 04, 2003 9:44 PM Subject: RE: [Chevelle-List] cowl plenum air cleaner (picture) > I think nascar uses cowl due to horsepower restrictions. I got this info > from one of Tod Bodine's mechanics. > > At 09:06 PM 3/3/2003 -0600, you wrote: > >Two schools of thought here - the NASCAR type guys use the cowl plenum > >instead of forced air probably more for aerodynamic reasons than > >anything else. I would think drawing air from the base of the > >windshield would also have less turbolence than force fed from front > >ducting. Drag racers (such as Pro Stock) on the other hand use huge > >scoops for not only clearance but to force air into the engine. > > > >I asked Warren Johnson during a question/answer session a few years ago > >what he'd like to see changed in Pro Stock. He said (in essence), "Get > >rid of the tunnel ram and carburetors and go with low profile fuel > >injection. It takes about 60 horsepower to push the scoop through the > >air at speed." > > > >Dale McIntosh > > > > > > > > > > > Yeah, but how about the temp of the air? Wouldn't it be > > > hotter coming off the back of the engine? > > > > > > -----Original Message----- > > > From: [EMAIL PROTECTED] > > > [mailto:[EMAIL PROTECTED] Behalf Of > > > McLerran, Larry W. > > > Sent: Monday, March 03, 2003 6:34 PM > > > To: [EMAIL PROTECTED] > > > Subject: RE: [Chevelle-List] cowl plenum air cleaner (picture) > > > > > > > > > Don't forget about the "low pressure area" created at the > > > cowl vent openings, by the windshield!! The negative pressure > > > created at this area helps deliver a vortex for delivery of > > > outside air (mini-turbo effect) to the intake charge, not to > > > mention the differential in air temperature, thus greater air > > > density=horsepower!! > > > > > > Larry > > > > > > -----Original Message----- > > > From: [EMAIL PROTECTED] > > > [mailto:[EMAIL PROTECTED] Behalf Of Clint Hooper > > > Sent: Monday, March 03, 2003 2:03 PM > > > To: [EMAIL PROTECTED] > > > Subject: Re: [Chevelle-List] cowl plenum air cleaner (picture) > > > > > > > > > The cowl plenum system just looks so much more sano than > > > those other set-ups,IMO. Clint Hooper LT5 Registry Director > > > '91 ZR-1 Callaway Aerobody http://www.LT5Registry.net/ '69 El > > > Camino ProTourer ACES #1650 > > > http://dalesplace.com/misc/friends/clint_hoope> r.htm > > > '99 Honda > > > F6 Valkyrie custom for sale > > > ----- Original > > > Message ----- > > > From: <[EMAIL PROTECTED]> > > > > > > > > What are the advantages of using this system over some > > > other cold-air > > > > induction? > > > > > > > > I have seen such systems with the intake tube located in > > > the high-beam > > > > headlight sockets, through a hoodscoop, and through the > > > inner fenders, > > > > near the battery shelf. Other than the cowl plenum system > > > using less > > > > hose and thus being less complicated, are there any arguments that > > > > make one location for the cold-air intake better than another? > > > > > > > > Dave. > > > > -- > > > > www.swingvictoria.com > > > > > > > > ----------------------------------------------------- > > > > To Unsubscribe please visit www.chevelles.net/list.html > > > > To start a new topic, send mail to: [EMAIL PROTECTED] > > > > > > > > > > > > > ----------------------------------------------------- > > > To Unsubscribe please visit www.chevelles.net/list.html > > > To start a new topic, send mail to: [EMAIL PROTECTED] > > > > > > ----------------------------------------------------- > > > To Unsubscribe please visit www.chevelles.net/list.html > > > To start a new topic, send mail to: [EMAIL PROTECTED] > > > > > > > > > ----------------------------------------------------- > > > To Unsubscribe please visit www.chevelles.net/list.html > > > To start a new topic, send mail to: [EMAIL PROTECTED] > > > > > > > > >----------------------------------------------------- > >To Unsubscribe please visit www.chevelles.net/list.html > >To start a new topic, send mail to: [EMAIL PROTECTED] > > > > ----------------------------------------------------- > To Unsubscribe please visit www.chevelles.net/list.html > To start a new topic, send mail to: [EMAIL PROTECTED] ----------------------------------------------------- To Unsubscribe please visit www.chevelles.net/list.html To start a new topic, send mail to: [EMAIL PROTECTED]
