The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 69 Camaro front valance and spoiler on a 67 c10?

skorpioskorpio · 11-24-2014, 03:50 PM

Ram Air has all kinds of issues, the ill effects of pressurizing carburetors is just one of them. In most of the '60 applications of forward facing hood scoops air pressure and density were all over the place as humidity, altitude, attitude, and temperature changed, basically guaranteeing an inconsistent air fuel mixture. Same holds true, to a lesser degree, of electronic fuel injection, most of the OEM PCUs are not really fast enough to adapt to wildly changing intake air quality which is what a crude velocity based attempt at free forced induction gives you. Best thing you are going to be able to do for consistency is to give an engine a cool air source without turbulence at predictable pressures. To try and force some inconsistent air source into a engine based on aerodynamic guesses will lead to combustion that is constantly varying between rich (dirty) and lean (destructive).

...and yes that is why cowl induction type scoops or rearward facing scoops basically replaced all other types.

11-24-2014, 03:50 PM	#62
skorpioskorpio Registered User Join Date: Nov 2010 Location: Los Angeles, CA Posts: 1,018	Re: 69 Camaro front valance and spoiler on a 67 c10? Ram Air has all kinds of issues, the ill effects of pressurizing carburetors is just one of them. In most of the '60 applications of forward facing hood scoops air pressure and density were all over the place as humidity, altitude, attitude, and temperature changed, basically guaranteeing an inconsistent air fuel mixture. Same holds true, to a lesser degree, of electronic fuel injection, most of the OEM PCUs are not really fast enough to adapt to wildly changing intake air quality which is what a crude velocity based attempt at free forced induction gives you. Best thing you are going to be able to do for consistency is to give an engine a cool air source without turbulence at predictable pressures. To try and force some inconsistent air source into a engine based on aerodynamic guesses will lead to combustion that is constantly varying between rich (dirty) and lean (destructive). ...and yes that is why cowl induction type scoops or rearward facing scoops basically replaced all other types.