Jartanyon

After seeing some threads on making a cowl induction box and battling the heat this summer, I was thinking of trying the same thing, but building one that would pull from in front of the radiator and the cowl. Anyone see any possible problems with doing it this way?

terry82

several guys have done this, try a search.you have the right idea.

GUSTO14

If you car is a '78 (?), you should already have a cold air induction system, like this...



These things may not be the most attractive, but they actually did work very well and could probably even be adapted to an earlier Corvette with little difficulty.

Good luck... GUSTO

The13Bats

I am guessing you saw PaulDanas cool one...

https://www.corvetteforum.com/forums...est-check.html

There was also another cat, I cant find the thread he used the tuner air cleaners installed in the wiper bay and had tuner duct work to them....it looked old school racy to me...

Jartanyon

Thanks for the replies. I have read most of the threads on here about it as well as a couple about the aerodynamics (or lack thereof) with our C3's. This one particularly sparked my interest after I drilled out the back of the hood for air:

https://www.corvetteforum.com/forums...ir-intake.html

I do have a '78, but the factory air set up was not an option after my rebuild (no room). I was originally going to do just the cowl, but then thought why not try and pull from the front as well. I just dont know if there are any issues with doing it this way with both sources.

MIKE80

I made one that takes the cold air from the front. Much cooler air temps going into the intake with it.

https://www.corvetteforum.com/forums...80-hood-4.html

cv67

Dont know that theres a downside the cooler the air the better

Any way to vent hot air out of the bay is a plus guessing car mfrs dont do this due to all the electronics underhood or bean counting

addballer696

from my experience, the downside is that when I drive my corvette in temperatures below 45 the air is too cold and the engine boggs down. And that's after having advanced the timing as far I could. If i did it over again I would make a system that could easily be swapped back to original once the colder temperatures come around each year. Just a heads up.

7t9l82

Try adjusting your carburetor.

pauldana

I am currently having 15 units made... this is for the MASSDROP vendor and will be posting it again within the next 4-6 weeks,,, fiberglass units are currently being built.

gg521

My guess is that bringing air in from the cowl and from the front at the same time will not work well. I can see where they might fight each other.

7t9l82

If you can get cool air from the front and leave the rear open that's probably as good as you can do.

Jartanyon

@ Mike - looks simple, yet effective. Thanks for sharing!

@ cuisinartvette - I agree about the cool air. I was just wondering if there is a downside to pulling from both sides simultaneously.

@ addballer696 - I can see where the colder weather could turn into an issue. I run a 180 thermostat which works out very well for my application. I only drive the car in the summer time and pack it up for the winter (Chicago...ugh ) I guess I could always switch back to the open air element I have on there now in the fall if it started to cause problems.

Thanks for the heads up on the units, Paul. Those won't work with factory fan/shroud though, right?

gg521 & 7t9l82 - that is what I was wondering...will they fight each other. My guess is that both sources will probably produce the same amount of force. Either there will be a lot of turbulence near the air filter or there will be neutral pressure in the middle and the carb will have to pull harder for air.

COOLTED

I can't see a downside to pulling air from both front and rear. If the 2 air flows happen to meet right at the carb it would seem to be the best possible scenario, but either way you are getting fresh air into the engine.

pauldana

No, it will not work with factory fan and shroud,,, but, FWIW... the factory fan and clutch will eat up more HP than you will get from the CAI
So,, if you are doing this for the HP gain... the Fan clutch and stock fan removed would give you more HP


If one side is less, then yes, you have a downside, instead of getting any ram air, the higher side will always equalize the lower side.. think about it:-)


This is the same reason if you run duel fans, they have ether a separation between the two on the radiator side or they turn on both at the same time same speed.... you can not run a small fan and a large fan on the same shroud or different speeds, if you do, instead of sucking air through the radiator the fan with the stronger draw will draw that air through the weakest link or low area..

Jartanyon

True, but wouldn't the low side (negative pressure) in this case be the carb which is sucking in air? I think some are confusing this for some type of ram air set up - not the case. I am feeding cold air to the carb (and lots of it), not ramming it down its throat!

pauldana

No.. air will always go to the least restrictive way... yes, some will go down the carb, and some will go out the low side of the air pressure ducting.. if you can have ram air why not??!???? what would be the purpose to loose any of the pressure at the bowl?? Remember, all a turbo does in increases pressure..
So, no... it is not a good design..

I own my own chassis dyno and will be posting results in the next 2 months... (got to finish the garage its going in first)...

All the car manufactures now incorporate CAI's on there cars... some with a ram air effect like mine...
please show me just 1, that takes its air form 2 totally different locations like you are talking about... i know of none, for the reasons i have given i am sure.,...

REELAV8R

IF You achieve ram air it may be a concern. Next question is at what speed do you achieve ram air? That would mean a positive pressure inside the airbox. I suspect it would be a very high speed in most cases.
So most of the time and maybe all of the time, ram air effect would not even be a factor. I would pull from both side if is possible.

Reduce the vacuum in the airbox as much as possible and feed the engine all the cold air it can handle.
When you launch from a stop how much ram air is present? Right?

So what good is any kind of ram air intake doing you until you get to a speed that it is ramming in air faster than the engine can consume it. In other words at least at a rate of what?, 600 Cubic feet per minute or more? That may be above 80-90 MPH. How often does a guy go that fast unless he is road racing?

If air coming from two directions would be a factor then it could be a simple matter of installing a swinging flapper door that would close due to the movement of air in the wrong direction.

Jartanyon

With all due respect, please don't turn this into a "mine is better" selling thread for your design. I am not here trying to dispute your design, nor am I trying to create a ram air design regardless of whether I can or not. We both have recreated a wheel that has already been built by many car makers - I am just wondering about combining them both on one since both styles are used. Im sure they were created for cold air in most cases unless they are truly a ram air design.

pauldana

With all do respect, I am not...you ask if your design is good, in my opinion, and i have done a LOT of testing, No, it is not a good design due to the fact you are trying to pull air from 2 different ports with 2 different air pressures..

if you do not want the opinion, do not ask...

there are many that do not like my design for whatever reason... cool.. and they have said what they though of it when i asked.. good bad and indifferent..And I have listened, and sometimes made a change due to there constructive criticism..

do you just want an adaboy? or do you truly want constructive criticism?