View Full Version : Are cowl induction and forced air intake the same thing?
Byfield Sep 22nd, 98, 6:37 AM At the risk of sounding ignorant, are these the same thing?
Also, what is the advantage of these over standard intake setups?
Thanks, Kurt
Gene Kidd Sep 22nd, 98, 7:01 AM Kurt, air from outside the engine compartment is cooler. Cooler air makes more horsepower and it's basically free. If you can put the air entering the carb under pressure it is almost like installing a low pressure blower or super charger. More air more power. This is an extreme example but I hope you get the big picture.
Byfield Sep 22nd, 98, 7:10 AM Thanks Gene,
So, would this be a valid application: Remove the 2 inner headlights on a 68, and via the use of some sort of tube, connect the air cleaner intake to the 2 open headlight wells? (forgeting about bug/stone filters, construction, etc. for the moment)
Would this be overkill and too much air, or would it work? Do you need to be able to regulate the airflow, or can you just let it blast in?
Thanks for the assistance
Kurt
Gene Kidd Sep 22nd, 98, 9:13 AM No regulation would be necessary. You will not necessarily need a screen if you leave the filter in place, but it sure would keep the big objects out.
283v8 Sep 22nd, 98, 11:39 AM I would say that cowl induction is a form of forced air induction.Cowl induction uses a high pressure area in front of the windshield to "force" air into the carb (as stated above).
I don't think that at attainable speeds you can get too much "force" to the carb.
BEAST72 Sep 22nd, 98, 5:17 PM Kurt, I used to have a setup just like you described on my 442, it worked great! I ran the tubes to the grilles around the radiator and tied the tubes into a dual snorkle '70 Z28 aircleaner. I did'nt have any screen, just the grilles (usually had a good bug collection in my air filter!!). I don't think that there was really much ram pressure, but on a cool night you really could feel the difference in power. If I remember correctly, you get about 1% increase in HP for every 10 degrees of air temp. drop.
Buck Mustard Sep 23rd, 98, 5:09 AM It works like this: when air is cooler, it is more dense. If the air is denser, than you can cram more of it into each cylinder. More air = more power.
RobB Sep 23rd, 98, 7:58 AM Both use a hole to get air from outside the engine compartment into the carb. Cowl induction, as stated above, gives the air that is hitting the windshield somewhere else to go. The force of the air is not as strong as a forward facing scoop.
Forced air (or ram air, or a funtional hood scoop) takes air from a forward facing hole in the car (or a piece of dryer duct) to provide a good source of cold pressurized air.
In both cases you need to make or buy a plenum that will force the air through an air cleaner. The hoses you suggested should not be run straight to the top of the carb. Even Small debris can mess up your cylender walls qiuick and bad.
Byfield Sep 23rd, 98, 8:05 AM The image I have in my mind is more or less what was described above: Use a dual snorkle air cleaner and duct the snorkles to the front of the car.
Using the inner (or outer) lights of a quad light setup would be ideal as it would allow you to funnel from the larger opening to a smaller duct. The loss in light could be compensated for by using a newer dual beam lamp in the remaing light location.
This has all come about after seeing a camaro set up similar to this at the vintage races in Elkhart Lake this summer. I was wondering if it has any practical street applications, or if it's a waste of time if you're not racing
Regardless, I think it would look pretty cool if some time and effort were put into a quality setup
BEAST72 Sep 23rd, 98, 12:50 PM Well Kurt, I just looked at my '69 EC and it looks like you would have to do some chopping of the core support to get the headlight openings large enough and you would have to relocate the battery (a good thing), but it should work. Cutting up your core support might be kind of "permanent", though.
I do not think that ram pressure will amount to much in street driving in any set up, but the cold air induction is very much worth the effort. A cowl induction setup might be easier to make, but the tube setup would be decidedly different.
Byfield Sep 23rd, 98, 7:11 PM Yeah, I've not actually explored the logistics of doing such a modification. Rather, it falls into that huge realm of "Hey, this could be kind of cool" type stuff that we always seem to think up at the races, after a few beers and 8 hours in the sun.
Still, it would be quite different from the usual modifications you see at shows.
Steve S Sep 24th, 98, 1:06 PM Anyone remember the FORD Thunderbolt. It could be had from the factory with the setup you describe.
Rainer Sep 24th, 98, 1:11 PM It also had an aluminum front end, didn't it?
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