Induction Systems
Thread Starter
Safety Car
Joined: May 2003
Posts: 4,797
Likes: 239
From: Ocean Township NJ
Induction Systems
Chrysler Corp cars used a Ram Air system and Chevrolet used a cowl induction system. Speculation or cold facts about how one affected torque and power versus the other.
Joe
Joe
Drifting
Joined: Mar 2006
Posts: 1,263
Likes: 188
From: Wabasha Mn
I ran a new 76 Trans Am back in the day and with the factory sealed shaker scoop block off plate removed it ran a tenth quicker in the 1/4 with no other changes. Have been articles stating that the cooler denser outside air can increase performance.
Race Director
Joined: Jan 2002
Posts: 15,363
Likes: 2,732
From: Close to DC
C2 of the Year Finalist - Modified 2020
I have a fresh air induction on my '67 SB that I built. I draws air from the back of the BB hood, sometimes referred to as the cowl area. After installation, I did rejetting and timing adjustments, and then took my car back to the track. Previously I turned 13.6/104. With the new system, I could not keep the car from spinning well into 2nd gear. The increase in torque was very evident with 14.1/14.2 times. Based on this experience, my cowl area system works. If you go to my Album, I have two pictures of the engine side of it. 
Dennis
Dennis
Team Owner
Joined: Oct 2000
Posts: 38,897
Likes: 1,927
From: Washington Michigan
The Chevy systems emphasized two things - the high-pressure area at the base of the windshield, and cold air; there's about a 1% increase in power for each 10*F the intake air charge is below ambient underhood temperature. I don't think Chevy ever advertised "ram-air".
I agree with John, but the air cleaner on the mid year fuelies (and C1 airbox cars) certainly comes close
