Air intake tube routing for the race tail?

I had a tube I thought would work but nope.

I tried searching for some answers but no luck.

Anyone have some thoughts on the air intake tube for the race tail?

I'm stuck.
 
Yes, the tube from the air filter to the throttle body.

I had a 4" tube, but the body kept interfering with the 4" housing. I wouldn't sit right.
 
If you run the tube straight back, you will typically need to clearance the body. Use a tube with a 15 degree angle to point the filter down. This is what I have on my car (with a race tail). This is the most common solution.

If you don't want to do that, you can run the tube down in front of the rear tire. This requires a pretty severe turn before the TB, but solves the tight clearance problem where the body gets tight near the chassis brace. Several cars have taken that approach as well.
 
There is a new page on the wiki that discusses the topic (see Engine--> Intake). It would be better with more pictures, so if other builders have additional pics or comments, please send them on!

Use public.slc.wiki in your browser URL if you have public access only.
 
Admittedly I know nothing about aero BUT wouldn't Al's design PULL air out (air has to reverse direction to enter intake) ? Wouldn't a NACA duct supply smoother air and more volume? I know MAF's (at least in BMW's) can be very touchy.
 
Last edited:

Keith

Moderator
Like the car in Red Al.. :thumbsup:

Damian: When moving, the tail creates a low pressure area behind the car and would thus be slow moving, and probably even circulating TOWARDS the intake, i.e. in the opposite direction to the car travel.

A bit like this, although this is for a true Kamm design tail. I am not sure if the SLC was designed with the Kamm principal in mind although any car who's lines end abruptly and are squared off to a specific ratio ( tapered to approximately 50% of the car's maximum cross section), is deemed a "Kamm Tail".
 

Attachments

Last edited:
In the illustration above the air is still "attached" to the UPPER body where this cowl is and it illustrates the air moving in the opposite direction and actually goes to more to prove my point. He would have to draw air from BEHIND the car as most others do BUT this takes air from the top and thus the intended effect never has time to take effect (notice its opening is still before the rear most part of the car). It would seem that any air going into the tube is being sucked in by the motor instead of fed in naturally. Again I'm not versed in aero (and thanks for the pic. You guys on here really are some smart COG's (left out the W as to be politically correct LOL). BUT even the illustration provided seems to contradict the purpose it was posted. I'm not saying it can't work or that he is going to eventually blow up his motor; I'm just curious as the the choice in direction of the Vent (which is how this is placed). GORGEOUS car regardless!
 
Last edited:

Doug S.

The protoplasm may be 72, but the spirit is 32!
Lifetime Supporter
Perhaps the most mention I see regarding a "Kamm tail" occurs when discussing the Daytona Cobra...very distinctive!

Cheers!

Doug
 
Damian, there are 3 ducts on either side of the car, 2 naca ducts and the one in front of the rear wheel. Any air going out of the rearward facing scoop is being squeezed into that space so the air is being forced into the filter. By the way, the car runs great, so I think your concern is unfounded.
 
Last edited:
Again the air coming from the vents is moving in the opposing direction of the intake and IF that is creating your desired effect than there is no need at all for the opening in the back of the cowl. I just asked a question about design theory and posed my concerns and when the Kamm tail pic was posted it only went to further my point. I said I didn't feel as if there was any real threat to the motor I just know how finicky MAF's can be and how the introduction of air into the system can effect it. My thinking was that it would be like having a small vacuum leak. Car will still run BUT not like it should at speed. Either way I see feathers getting ruffled and the pic backed up my theory so with that I thank you for the education and I'm out.
 

Keith

Moderator
Sorry, for some reason I was thinking the engine air intake was low down at the back (near the rear tyre?) and that engine air would come in from the tail. Apologies for lack of understanding the layout..
 
Al,

Your car is stunning. The body changes, the NACA ducts, the panel, the color combo is just amazing. I only hope I can pull it off as well.

Question- where did you get the front spades for downforce?
 
Al,

Your car is stunning. The body changes, the NACA ducts, the panel, the color combo is just amazing. I only hope I can pull it off as well.

Question- where did you get the front spades for downforce?
Mike, Thanks, I made a template for the canards and cut them on a friends waterjet, then powder coated them Black Chrome. They are 1/4 aircraft aluminum.
 
Damian, could you argue that the direction of the air intake opening is irrelevant under positive air pressure inside the engine bay of the moving vehicle? Al answered that already:

Damian, there are 3 ducts on either side of the car, 2 naca ducts and the one in front of the rear wheel. Any air going out of the rearward facing scoop is being squeezed into that space so the air is being forced into the filter. By the way, the car runs great, so I think your concern is unfounded.
 
Top