best airbox/filter set up?

[Nomad]

Indeed that is lovely engine bay...I'm aiming for something like that...think its my winter project...unfortunately my water pump and bearing went and it sprayed crap all over my engine bay...been cleaning it ever sonce but I think I'll need to pull most everythin out of the bay to do it properly...really like the silver engine bay color.

[Azzurri GTV]

Quote:

Originally Posted by borrani Here's the repro GTA airbox that came with my car. I added the TWM or some UK outfit's 40mm long <a style='text-decoration: none; border-bottom: 3px double;' href="http://www.serverlogic3.com/lm/rtl3.asp?si=22&k=air%20horns" onmouseover="window.status='air horns'; return true;" onmouseout="window.status=''; return true;">air horns</a>. A shame to cover them up! I had to bend the #4 airhorn to clear the fender. Autodelta's solution was to pound the fender well down. As it was I did take a hammer to my inner fender well, just a bit, but hey, Autodelta did it first! I have pics of the Jochen Rindt Sebring-winning GTA that would floor you! The fender well is nearly flat, and they put it in a beautifully executed large oval hole, with cover, on the pass. side fender well to facilitate quick choke tube removal from the carbs, among many other mods. It's a local Seattle car now. Chassis 613 006. Wish I could get some type of air filter on the car. Hate running without it. Need more time and money. What else is new? Cheers, Steve S. AR 613 169

[Azzurri GTV]

Just curious, but would there be any way to install a gta airbox in a giulia super?

[conedriver]

Group,

I have been meaning to contribute to this thread for a while, but posted the following in the Spider area. I have still not run the chassis dyno comparison, but maybe the following will be of interest.

davebert,

Thanks for the compliment...I have followed conversations comparing the Shankle Quadraflow to an original SPICA airbox, and felt the Shankle might be better than a SPICA if it also drew air from a cold airbox. Comparing a Quadraflow ingesting hot underhood air to a SPICA box breathing colder air seems a little like comparing apples and oranges. And yes, I acknowledge that the SPICA cold air intake isn't completely sealed from underhood air. I also recognize that the different length and diameter of the intake pipes will resonate at different engine RPM's. After all, that's what John Shankle had in mind when he developed the Quadraflow. We have a new race shop in town with a high-tech engine dynamometer, and I intend to take my car there for back-to-back tests of Shankle vs. SPICA air intake. But, I will use the cold airbox I fabricated for my Quadraflow. I made this by riveting hardware Aluminum angle to the backing plates, and to create a framework to pop-rivet Aluminum sheet to create the box. I used a laundry dryer exhaust vent to get a square end that transitioned to a round opening for the air duct. This flexible duct was a generic product from a local auto parts store and was slightly larger diameter than the molded dryer exhaust, so I just wrapped some duct tape on the outside to create a tight fit. I ran the flexible duct to an area behind the front bumper and connected to a round K & N air cleaner.


Quote:
Originally Posted by davbert
[quote=conedriver]Murray, 40 mm Spica throttle bodies, Shankle quadra flow intake horns inside a cold air box

George, I saw your car run up in seattle and was really impressed. I also have the bigger TB's with the old shankel quadra flow horns. I'm thinking of building a box and piping cold are through the aux headlamps. Can you post some detail pics of your cold air box? I may buy a generic DCOE aftermarket type and modify it to the quadra flow horns.

cheers

Davbert

[clemensh83]

Hi guys!

Very interesting thread. I was trying by myself a few setups. First I had the stock euro setup, first with additional holes in the center tube, then I just flexed a window out of it. On the alu air collector I enlarged the inlets and rounded the edges, because I machined the venturis to get more intake (see how they are nice and shiny)



It wasn't enough for me, cause I got an "airbox-hype"... I was able to get an carbon GTA airbox I wanted to use with a K&N and the GTA angled horns, but they didn't fit in infortunately



Then I just built a custom airbox around the air horns.



Underneath



And on my dad's Zagato we mounted a special airbox with "integraded air horns", it was built from an German tuning firm for using Webers on VW engines, but fits perfectly on Alfas...
But the upper part is custom made because the Zagato hasn't got much room under the hood...



With a Sprint Filter plate for the carb support



I think the most important thing for street engines is to mount air horns as large as posible, because they boost low and midrange!

Greetz Clemens

[frederic75000]

Hi,

I want to keep the stock airbox and the paper air filter for road using (and I will remove the filter when i'll be on track ).

What do you think about removing the center tube of the airbox (one's inside the air cleaner), instead of drill more holes in it ?
and about removing the filter for track using ?

[classicalfas]

How much was the GTA carbon fiber airbox, I am looking for the same thing in either carbon or fiberglass. Was there any fitment problems on your GTV. Thanks, Peter.

[genericwood]

Peter, I bought a repro GTA box from Alfaholics in the UK. I don't recall the exact $, but it was not cheap. Check their web site and pray the $ gets stronger! On my 2L race car, it would not fit until I put a 1/4" spacer under the intake side motor mount.

Erik

[conedriver]

I finally ran the chassis dynomometer comparison. Results can be seen in the new "SPICA vs. Quadraflow" thread in the Carburators & Fuel Injection section.

[quote=conedriver]Group,

I have been meaning to contribute to this thread for a while, but posted the following in the Spider area. I have still not run the chassis dyno comparison, but maybe the following will be of interest.

davebert,

Thanks for the compliment...I have followed conversations comparing the Shankle Quadraflow to an original SPICA airbox, and felt the Shankle might be better than a SPICA if it also drew air from a cold airbox. Comparing a Quadraflow ingesting hot underhood air to a SPICA box breathing colder air seems a little like comparing apples and oranges. And yes, I acknowledge that the SPICA cold air intake isn't completely sealed from underhood air. I also recognize that the different length and diameter of the intake pipes will resonate at different engine RPM's. After all, that's what John Shankle had in mind when he developed the Quadraflow. We have a new race shop in town with a high-tech engine dynamometer, and I intend to take my car there for back-to-back tests of Shankle vs. SPICA air intake. But, I will use the cold airbox I fabricated for my Quadraflow. I made this by riveting hardware Aluminum angle to the backing plates, and to create a framework to pop-rivet Aluminum sheet to create the box. I used a laundry dryer exhaust vent to get a square end that transitioned to a round opening for the air duct. This flexible duct was a generic product from a local auto parts store and was slightly larger diameter than the molded dryer exhaust, so I just wrapped some duct tape on the outside to create a tight fit. I ran the flexible duct to an area behind the front bumper and connected to a round K & N air cleaner.


Quote:
Originally Posted by davbert

Quote:

Originally Posted by conedriver Murray, 40 mm Spica throttle bodies, Shankle quadra flow intake horns inside a cold air box George, I saw your car run up in seattle and was really impressed. I also have the bigger TB's with the old shankel quadra flow horns. I'm thinking of building a box and piping cold are through the aux headlamps. Can you post some detail pics of your cold air box? I may buy a generic DCOE aftermarket type and modify it to the quadra flow horns. cheers Davbert

[snj5]

Beautiful airboxes and engine bays.

Although not on an Alfa, I've found that height above the stacks is pretty important. There's a guy (www.durable1.com) who makes a simialar rounded low profile intake for DCNFs that he could make for Alfas. Here's a comparison between the stock DCNF air horn and the 'short stack'. The difference on the dyno was about 8-9 hp in the top end. This gives a lot more effective room over the inlet for better flow.
I've often heard that about .75 inch is needed at a minimum - any one have experience with this?
thanks

[clemensh83]

Hi!

Removing the center tube in the stock euro airbox is at first a good idea, but if I remember right, but you could get into trouble when trying to mount the rear cap. I cut a "window" out of that tube.

I had the same problems as Genericwood when trying to mount the carbon GTA airbox (I bought at ebay). Second problem was, that the angled GTA airhorns won't get in that type of GTA airbox (there seems to be two different shapes).

So I made my own airbox. Low end torque is improved because of the airhorns. And the noise is nice too... ;-)

Regards Clemens

[1969ALFA]

Hello All
I am also in the process of drilling more holes in the center tube of my airbox. After seeing the pix from papajam I can see how this might help.
I could not believe how few holes there are in the center tube.
Lief

[classicalfas]

Erik, Does the fuse box have to be moved to the firewall to use the GTA airbox? Peter.

[genericwood]

Peter, I'm not sure where your fusebox is located. On my race car, it is located in the driver's footwell. On my GTV street car, it is also inside the cockpit. So I guess I can't really answer your question!

Erik

[classicalfas]

Sorry, my '67 GTV has its fuse box just rear of the of the first barrel of the first carb. Pete.