Mike where did you get that black foam at?

 

You meant 'aerodynamics', but I get your point and agree.

Again I agree- except and as stated further above, the stock configuration of a C3 is not conducive to developing a properly isolated cowl charge.

The point of my experiments in the linked post and later backed up by noonie's, was that a stock '73-'75 with open snorkels does not create enough pressure in the cowl to cause flow into the air cleaner housing. This is witnessed by no decrease in temperature inside the air filter housing at speeds up to 100 mph. Had there been significant flow, the air temps would have decreased markedly as the flappers opens with WOT. No such drop occured.

Noonie's test indicates that with the same two snorkels blocked off and the flapper removed, the housing air temperature drops to almost ambient. This decrease in temperature is simply because the source of air to supply the engine is exclusively from the cowl via the underhood ducting. The flow is created by intake manifold vacuum, not because of cowl pressure.

 

This is what I used. I slit the bottom of the foam to go around the edge of the air cleaner pan that I made and glued the ends of the foam together.

Here's a link to the foam.
http://www.jegs.com/i/Moroso/710/970...oductId=745281

Here's a link to a thread I did on the CAI.
http://forums.corvetteforum.com/c3-t...80-hood-4.html

 

addballer696,
I too am interested in your setup. If you get a chance, can you show a pic from the engine compartment to the top of the firewall without the induction tubes? I'd like to see exactly where you cut the holes. Hence, my curiosity on how you did it with 4" tubes. Nice job btw. It's exactly what I was thinking but using 3" tubes.

 

resdoggie, heres the best I can do. The car is with my parents cuz im in med school right now, but basically its gonna be a really tight fit. The one closest in the picture is gonna be a little closer to the center than the other tube. If you decide to use the spectre connectors its gonna be impossible. The tubing isn't straight and you have to use some sort of connection that you can have some give with. What im trying to say is the metal isn't flush. But everything is very solid and there is no way that its coming apart. I also chopped off about an inch of the "verlocity stacks" so they sit flush with the bottom of the cowl area, but are still high enough that no water will get in. And yeah on the top I cut a slit so they slide right in that gap and that holds it in place very nicely, no glue or anything like that needed. Also If you buy the K&N filters (Mine were 4X6x2) you will need to grind off some of the rubber ring on the 4" circumference so that they will fit snug in the tubes.

 

Thanks, Doc! Did you ever consider using 3" tubing?

 

na, go big go home baby

 

Mike
Thanks. Link was to youtube vid?
What was the avg temp in the air cleaner assy vs the ambient/underhood curious .

 

To The Top..........................

just because it has so much useful info!

 

 

:rof l::r ofl: :rof l:

 

FTFY

 

on my CAI unit, I MEASURED a greater than 45* temp difference between the bowl area and just outside what would be an exposed filter.

Also, I had a +.2psi boost in pressure in the bowl as compared to the area just outside what would be an exposed filter.

 

Once again, it's like I can predict the future. The peanut gallery is out in full force

 

Unless Chevy put the distributor on the front I would say the ducts do go to the cowl

 

Click on the link in the post and tell me what you see.

 

Unless isolated to the induction system, opening up the cowl to the engine compartment doesn't necessarily provide the functionality of genuine cowl induction. While a properly sealed CAI can increase induction pressure by a measurable amount above the throttle body (carb or injection), it's the added density of the cooler air being ingested that more significantly affects engine output. However, although there is most definitely a pressure build up at the base of the windshield at work here, without isolation the differential from the cowl area relative to engine compartment pressures may not always be sufficient to push airflow inward. Thus, proper isolation of the CAI system is somewhat necessary to assure that cooler, denser air charge actually makes the trip from the cowl all the way to the throttle body rather than becoming diluted with heated air.


We can dive more deeply into the whys and wherefores if need be, but IMHO that is probably best left to more comprehensive discussions on C3 aerodynamics as a whole. Suffice it to say that IMCO creating new openings into/from the engine compartment shouldn't be taken lightly or without doing a bit more research than simply scanning thru a couple of threads on the interweb such as this one.


Anyway, hope that helps more than causes any further confusion.







Kid Vette, that reply you posted "by" Zora is absolutely priceless.

 

Gee....thanks Mike! Now you've gone and given me a flashback! I'll have you know that it's been 44......yep 44 years since I've stirred any $**t! Seeings how the Generals in Nam decided we needed to pour in jet fuel with the feces/light it with a match/stir it until it was ashes (because the ground was too damp in the monsoon season for the stuff to dry out and be assimilated back into the soil) (FYI)......

So.....you could say that I definitely know my $**t.....and when necessary....How to stir it!

Now that that is cleared up.....had I known that fellow members would have used this thread to rape you so violently, I would not have re-posted it.

I don't understand their outright hatred for you.....you've always been such a nice guy to everyone!

I hope Santa brings every one of them a big bag full of f*****g coal dust......or a picture of Nancy Pelosi.

Now....back to the thread.

...

 

:roc k:

 

I do. There's few guys here that just hate when I burst their fantasy balloons. Makes them look silly in front of their fan club.

After years of boy-racer bench racing over the '73-'75 GM cowl induction system, I went out and tested it on my own car and proved beyond any shadow of a doubt that it doesn't work and why.

The cartoon of Duntov is hilarious, even more so when you understand the joke behind the joke of why his other hand is in his pocket. He had his fingers crossed because he knew he was telling an outright lie.

Even if NO testing had been done, anybody with any common sense would realize that there's no induction system in the world that will shave a full second off the ET of a 190 HP C3 Corvette.

Haters gotta haters and the believers of miracles will continue to believe.