05-06-2007, 04:35 PM
|
 |
Senior Club Cobra Member
|
|
|
Join Date: Jul 2001
Location: Evans,
CO
Cobra Make, Engine: NAF 289 FIA, 347 stroker with Weber 48's, building a '48 Anglia gasser, driving a '55 Chevy resto-rod
Posts: 3,119
|
|
Not Ranked
With all this discussion of the airflow or lack there of through the hood scoops does anyone know why the 289 comp cars almost always have a drilled aluminum plate at the front of the scoop? I really never noticed the difference in air flow until I was tuning my Webers, at idle with the hood up I could get the engine idiling at about 900-1000 rpm...then I drove it and needed to adjust one of the carbs, leaveing the engine idling, now at about 700 rpm, as soon as I opened the hood the idle increased about 200 rpm. And I don't have a "drilled plate" in front of my scoop. I never really experienced a difference in idle when I was running a 4-bbl...hood open or closed...with the Webers there is a big difference.
Just curious as to why this was done an the early comp cars? Especially if an open scoop reduces airflow...one partially blocked would seem to reduce it more.
__________________
"Breathe in... Breathe out... then move on with life. Lifes too short to sweat the small stuff"
Last edited by G.R.; 05-06-2007 at 04:37 PM..
|
1Likes
Threaded Mode
