Alwyn678

Of Any C-3. My question is How and Why? Especially since and L-88 and an LT-1 have a Direct Air intake and front Air scoops?

How and Why is that?


Thanks for the info

CaseyJones

Sounds like it's just someone's opinion. It is like other things...everybody has one.

The L-88 had a great setup and the late 70's up to 82 had a good setup (the one with dual intakes).

I would think that if the 74 setup was that good GM would have used it for several years.

I have no scientific basis for my opinion. Just seems logical.

Haggisbash

If I recall correctly, the 74 intake only opens when the throttle is well open and the idea was to take advantage of the high pressure area at the base of the windscreen to pick up cool air for the intake. I believe that it was dropped after complaints about the intake noise when it was working but it did seem to be a nice idea to me.

gcusmano74

The '74 (and, I think, the '73s and 75s as well) has a dual snorkel air cleaner, drawing from under the hood, and a "cowl induction" inlet traveling through the hood from the base of the windshield. The air cleaner base has a gasket to seal it to the hood. A solenoid valve in the hood, operated by a switch on the gas pedal linkage, opens the cowl induction air passage at wide open throttle, allowing the engine to breath cooler outside air.
It also allows the induction noise to overpower your radio, passenger or even a stock exhaust. Very cool for a gear head like me.

Easy Mike

Sorry. LT-1s had no special air intakes. If I recall, your original post concerned a performance hood and that's where the stock cold air induction popped up.

7t9l82

the LT-1 had the big block hood for carburetor clearance because of the new intake manifold. there was no cold air function of any significance.

Mike Ward

Correct.

http://forums.corvetteforum.com/c3-t...-a-1974-a.html

davidchristopher

Some are more bizarre than others:

Alwyn678

That sounds like the TRUE reason. The cowl induction and solenolve are long gone on

Alwyn678

Sounds like it may be worth the Hunt!

augiedoggy

Arent these the same solenoids and flaps that everyone removed to keep open for BETTER "performance?"

Someday Id love to see someone actually show some proof that these things increased performance... In theory they are great but theres never any real data it seems to prove they were anything more than mainly a marketing thing.
cold air intakes certainly can help I'm not saying they dont (I strongly disagree with some of the claims Ive read though) . But the induction flappers on top of the cold air intake just seems unnecessary. wasnt its main purpose to warm the car up quicker?

CaseyJones

Now THAT'S funny!!!

Mike Ward

You're confusing the '73-'75 system with later systems.

I did a test of the stock as-installed system on my '73 and demonstrated that it does NOTHING to reduce intake temps at speeds less than 100MPH.

1974CorvetteJimCr

I kept my 1974 Stock Hood, and removed the WOT damper. I also put a K&N 66-1101 X-Stream Top Filter in place of the original metal top, to allow for more airflow.

Kid Vette

Ontario73

Yes, but, above 110mph there is rumored to be a 1.053% increase in intake airflow and, therefore, about 1/2 a horse!

persuader

You guys are funny!

I don't know if the cowl induction on the Vette was any good but I do think that the hood looks better with the grille than without. Which is why I plan to add one to my 77. The grille that is.

augiedoggy

This doesnt really surprise me...

Its kind of like the article I read where they tested the performer,rpm and the air gap intake and found the air gap only keeps carb temps cooler for about 10-15minutes from the point of the car sitting and being completely cold. after the 10 minute warmup period the car lost all temp advantages over a regular intake and the cutout in the divider hurts more than it helps in most applications yet soo many still think its a better choice for a street engine.

I do like the looks of the vent in the hood as well... Then again my taste isnt for everyone because I really like the greenwood twin turbo hood that came with my 74... I have plenty of air flow, thats for sure. would I have swapped that hood onto a pristine car? probably not, but thats why I bought a project and made it mine guilt free

Mike Ward

Yes, and despite the test I did and just using simple logic and common sense, many still believe that the '73-'75 induction system cuts a full second off the 0-60 time 'cause Duntov said so'. That's where the cartoon Kid Vette posted came from.

Ontario73

Without getting into the physics; once a car is in the 5-6 second 0-60 time range. Cutting another second off that time would take another 100 horsepower or so. That is one hell of a stretch for cars that made 190-250 hp net!

The hoods to look cool though and have a bit more clearance for higher manifolds!