Under Bumper Air Scoops
#1
Under Bumper Air Scoops
Other than buying repop air scoops, is there anything else (from another vehicle, or custom made) that would accomplish the same thing.
I plan on adding this feature to my car (70 Cutlass), but would rather not pay the $225 price tag for a reproduced set.
d1
I plan on adding this feature to my car (70 Cutlass), but would rather not pay the $225 price tag for a reproduced set.
d1
#2
Build an airbox to draw air from the base of the windshield. It's an improvement over sucking in water from a puddle. The under-bumper design may have looked cool but it wasn't very performance oriented
#4
I'm not a 70-72 guy but on 68's the rear vent on the hood can be used.
But you're correct, I have also seen the a hole cut through the cowl to tap into the void where the wiper transmission is.
But you're correct, I have also seen the a hole cut through the cowl to tap into the void where the wiper transmission is.
#5
Again, this won't be "ram air", but then, neither was the Olds factory setup. Reducing the inlet air temp is far more important than any "ram" effect.
#6
Nearly every American car built since the mid-1970s has had outside air induction. So long as you ingest air from in front of the radiator, you'll get the benefit of lower intake temps. So long as you don't mind cutting holes in the core support, consider the inlet from a mid-1980s Chevy/GMC full size pickup. These vehicles used a round plastic inlet fitting that snapped into a hole in the core support. These trucks are still plentiful in wrecking yards. Get two of the fittings, fabricate a dual snorkle air cleaner, and get some dryer ducting. Total investment is probably under $50.
Again, this won't be "ram air", but then, neither was the Olds factory setup. Reducing the inlet air temp is far more important than any "ram" effect.
Again, this won't be "ram air", but then, neither was the Olds factory setup. Reducing the inlet air temp is far more important than any "ram" effect.
d1
#8
Two places come to mind : Mike Seidlick http://www.thegoodoldsdays.com/
and Ram Air Box
http://www.ramairbox.com/install.html
and Ram Air Box
http://www.ramairbox.com/install.html
#9
I just finished fabricating my own air scoops, I used two rectangular dryer ducts, wrapped with 3" flat iron for stiffness, a few bends, 3 holes drilled per side, then welded them to my frame, one 4"-3" plastic coupler per side, 2-3" hose clamps and some thick flexible rubber hose with metal reinforcement which I found at a rubber /hydraulic hose store at the port of Tacoma, then routed neatly out the front sides of the motor and attatched with 3" hose clamps to the dual snorkel air cleaner which I fabricated myself. It turned out great, and best of all cost less than $120.00 for the whole set-up. My car breathes much better and stays cool. It used to hesitate when I jumped on it, as with my aftermarket high rise intake manifold it was starving for air, now when I floor it it's go time, no hesitation. As soon as I upload the pics. from my phone to my computer I will TRY to post pictures. Good luck, Dster69442 By the way, I painted the scoops black so they don't stickout, but they look awesome!
Last edited by dster69442; April 6th, 2011 at 06:09 PM.
#10
I just finished fabricating my own air scoops, I used two rectangular dryer ducts, wrapped with 3" flat iron for stiffness, a few bends, 3 holes drilled per side, then welded them to my frame, one 4"-3" plastic coupler per side, 2-3" hose clamps and some thick flexible rubber hose with metal reinforcement which I found at a rubber /hydraulic hose store at the port of Tacoma, then routed neatly out the front sides of the motor and attatched with 3" hose clamps to the dual snorkel air cleaner which I fabricated myself. It turned out great, and best of all cost less than $120.00 for the whole set-up. My car breathes much better and stays cool. It used to hesitate when I jumped on it, as with my aftermarket high rise intake manifold it was starving for air, now when I floor it it's go time, no hesitation. As soon as I upload the pics. from my phone to my computer I will TRY to post pictures. Good luck, Dster69442 By the way, I painted the scoops black so they don't stickout, but they look awesome!
Can't wait to see the pictures. This is the type of feedback I am after.
d1
#12
To rich for my blood. On my 70 front bumper I have 2 openings in the bumper itself (unlike your model) that I plan on using. So instead of under bumper it will be "inner bumper" mounted. Well, that's the plan anyway.
d1
#16
scoops
The scoops are approx. 4" tall and 10" wide, rectangular , with a built in reduction to a 4" round (stainless steel dryer duct ) which I then attatched a 4" round to 3" round plastic pipe piece then used 3" clamp to attatch to the 3" hose which routes to the air cleaner and attatches to the snorquel. All parts were purchased at Lowe's and Home Depot. I got the snorquel piece at a local junkyard which I had to cut and weld, grind, bondo and paint to match the other snorquel (air intake) piece. You may also have to cut off the fluted ends on the snorquels to get the rubber hose to fit over them.
I then bought 3 feet of 3" stock flat steel, cut into 4 equal pieces, that I bent in my vice to match the 4" sides of the duct/scoop , drilled 3 holes per side (12 holes total ) and attatched to each 4"side using 1/2" bolts, nuts, and lock washers.
I marked the positions under the bumper and on the frame that I thought looked best and welded 4 pieces of angle iron (about3-4" in legth)to the frame which I then welded the flat 3" (previously drilled to fit the scoops) supports to the angle iron. I then re-attatched the scoops to the now welded brackets using the previously mentioned 1/2 " bolts, nuts and lock washers, painted everything flat black attatched the hoses and was complete.
I hope this helps you, good luck with your build. Derek
I then bought 3 feet of 3" stock flat steel, cut into 4 equal pieces, that I bent in my vice to match the 4" sides of the duct/scoop , drilled 3 holes per side (12 holes total ) and attatched to each 4"side using 1/2" bolts, nuts, and lock washers.
I marked the positions under the bumper and on the frame that I thought looked best and welded 4 pieces of angle iron (about3-4" in legth)to the frame which I then welded the flat 3" (previously drilled to fit the scoops) supports to the angle iron. I then re-attatched the scoops to the now welded brackets using the previously mentioned 1/2 " bolts, nuts and lock washers, painted everything flat black attatched the hoses and was complete.
I hope this helps you, good luck with your build. Derek
#17
Thanks for taking the time to post all the details of your build. Did you notice quite a difference from the stock air cleaner to the dual snorkel setup (performance wise)? Any adjustment to carb necessary?
#21
Installed the Under Bumper Air Induction on the 70 Cutlass
Got it done and it does not look too bad. Of course the scoops are a prototype and will be subject to change. Below are some pictures.
I got the used RAMAIR dual snorkel off of ebay. It came with a drop base.
The air cleaner lid is 1/8 thick plate steel that I had cut to 15 inches in diameter and drilled in the center to accommodate the threaded rod. I also got this from ebay as well.
The duct hose is suppose to handle 300*, so I am hopeful it will withstand abuse.
I left the windshield washer reservoir in its original spot. I had to secure the hose over in between the radiator hose and reservoir in order for the hood to close.
If the A/C compressor wasn't in its current location the hoses would look more symmetrical, but it is what it is.
I cut holes in the plastic inner fender and use PVC couplers (4" diameter) to connect the hose in the engine compartment to the hose underneath the car.
more pics in the next post...
I got the used RAMAIR dual snorkel off of ebay. It came with a drop base.
The air cleaner lid is 1/8 thick plate steel that I had cut to 15 inches in diameter and drilled in the center to accommodate the threaded rod. I also got this from ebay as well.
The duct hose is suppose to handle 300*, so I am hopeful it will withstand abuse.
I left the windshield washer reservoir in its original spot. I had to secure the hose over in between the radiator hose and reservoir in order for the hood to close.
If the A/C compressor wasn't in its current location the hoses would look more symmetrical, but it is what it is.
I cut holes in the plastic inner fender and use PVC couplers (4" diameter) to connect the hose in the engine compartment to the hose underneath the car.
more pics in the next post...
Last edited by defiant1; July 4th, 2011 at 01:01 PM. Reason: clarification/typo
#22
I could not afford the aftermarket scoops, so I purchased left and right side brake ducts off of a Dodge Viper (ebay-salvage yard).
I cut ducts in order to fit under the bumper and to accommodate the 4" hose better. I ran screws around the circumference of the end of the duct so the hose clamp has something to hold against preventing the hose from coming off. I wrapped the connection in gorilla tape for insurance.
I reinforced the top of each duct with steel 20 gauge (I think) and riveted in place.
I attached each duct to the bumper support bracket bolt on each side. I had to shim the gap to get the duct to sit low enough (required longer bolts).
I sprayed chassis undercoat paint on the ductwork as well.
So far, so good. It definitely channel bugs up the hose to the air cleaner filter.
I got lots of compliments at the car show I was at this weekend. Although most did not know that the 70 model did not come with the under bumper set up. But, they liked it all the same.
d1
I cut ducts in order to fit under the bumper and to accommodate the 4" hose better. I ran screws around the circumference of the end of the duct so the hose clamp has something to hold against preventing the hose from coming off. I wrapped the connection in gorilla tape for insurance.
I reinforced the top of each duct with steel 20 gauge (I think) and riveted in place.
I attached each duct to the bumper support bracket bolt on each side. I had to shim the gap to get the duct to sit low enough (required longer bolts).
I sprayed chassis undercoat paint on the ductwork as well.
So far, so good. It definitely channel bugs up the hose to the air cleaner filter.
I got lots of compliments at the car show I was at this weekend. Although most did not know that the 70 model did not come with the under bumper set up. But, they liked it all the same.
d1
#24
No rubbing. The hoses actually fit in the fender area well and since they are flexible if the tire did hit the hose it would flex (I left enough slack in the hose) and not break like a hard plastic duct might. Granted I have not tried a steep approach combined with a sharp turn. Now that I have even a "lower bumper" I take approaches/dips a little slower than I used to.
d1
Last edited by defiant1; July 4th, 2011 at 03:45 PM. Reason: Clarify
#25
Got it done and it does not look too bad. Of course the scoops are a prototype and will be subject to change. Below are some pictures.
I got the used RAMAIR dual snorkel off of ebay. It came with a drop base.
The air cleaner lid is 1/8 thick plate steel that I had cut to 15 inches in diameter and drilled in the center to accommodate the threaded rod. I also got this from ebay as well.
The duct hose is suppose to handle 300*, so I am hopeful it will withstand abuse..
I got the used RAMAIR dual snorkel off of ebay. It came with a drop base.
The air cleaner lid is 1/8 thick plate steel that I had cut to 15 inches in diameter and drilled in the center to accommodate the threaded rod. I also got this from ebay as well.
The duct hose is suppose to handle 300*, so I am hopeful it will withstand abuse..
Rgds
#28
I got the hose on amazon, link below
http://www.amazon.com/Thermoid-Neopr.../dp/B0039L5XOU
I used pretty much all 10' of it.
Yeah, you gave me the motivation to get mine done. Thanks for the info and pictures, it helped a lot.
Definitely, copy away. I wish I could have found a little wider duct opening, the ducts I have are 3" x 6 5/8". I would have preferred at least 8" wide. But it seems to do the trick either way.
As I said in the post above, this is strictly a prototype, so if something comes along that allows me to improve upon this I will be all over it.
d1
http://www.amazon.com/Thermoid-Neopr.../dp/B0039L5XOU
I used pretty much all 10' of it.
As I said in the post above, this is strictly a prototype, so if something comes along that allows me to improve upon this I will be all over it.
d1
#31
I got some duct from Aircraft Spruce....
http://www.aircraftspruce.com/index.html
after looking the other place looks like it is cheaper, and I am all about cheap!
http://www.aircraftspruce.com/index.html
after looking the other place looks like it is cheaper, and I am all about cheap!
#32
Thanks for the kind words.
No problem. I thought about using the 2 slots in my front bumper as well. Unfortunately the ducts did not fit due to the A/C condenser being located in front of the radiator. Plus I did not know if filling the 2 slots with the ducts would take too much air away from the radiator (while driving) and potentially contribute to overheating.
d1
d1
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