Cold air feed option

1. user_58507 Infrequent Poster Joined: Apr 2012 N.Yorkshire Posts: 115 '00 black Saxo VTR '00 Posi blue Furio

   #1 13th April 2012, 18:49

   The super 1600 rally cars seem to use the aerodynamic high pressure area at the base of the windscreen to provide the cold air feed for the engine but, I was wondering if anyone had done it with the standard single throttle body and what kind of results you achieved?
   
   It wouldn’t be too hard to either, modify the inlet of the stock air filter housing or make a custom air box and pipe it to the bulkhead next to the master cylinder and cut a hole through the bulkhead to the well that the wipers are in. The wiper panel is already perforated to allow air in for the ventilation system.
   
   The engine bay would be a lot tidier and the induction would be less susceptible to heat from the exhaust manifold.
   
   Tried various searches but can’t find anything. I’m sure I can’t be the first person to think of this so has anyone tried it?
2. RyanSaxo Established Member Joined: Jul 2007 Midlandzzz Posts: 1613 The 'S

   #2 13th April 2012, 18:53

   Quote:

   Originally Posted by TomiX The super 1600 rally cars seem to use the aerodynamic high pressure area at the base of the windscreen to provide the cold air feed for the engine but, I was wondering if anyone had done it with the standard single throttle body and what kind of results you achieved? It wouldn’t be too hard to either, modify the inlet of the stock air filter housing or make a custom air box and pipe it to the bulkhead next to the master cylinder and cut a hole through the bulkhead to the well that the wipers are in. The wiper panel is already perforated to allow air in for the ventilation system. The engine bay would be a lot tidier and the induction would be less susceptible to heat from the exhaust manifold. Tried various searches but can’t find anything. I’m sure I can’t be the first person to think of this so has anyone tried it?

   not seen anything like this done...
   
   could be a good idea?
   
   I'm pretty rusty on my fluids understanding but without a scoop what's going to force air into any pipe you put? you relying on the suck of the engine to draw air in?
3. user_58507 Infrequent Poster Joined: Apr 2012 N.Yorkshire Posts: 115 '00 black Saxo VTR '00 Posi blue Furio

   #3 13th April 2012, 19:02

   Quote:

   Originally Posted by RyanSaxo not seen anything like this done... could be a good idea? I'm pretty rusty on my fluids understanding but without a scoop what's going to force air into any pipe you put? you relying on the suck of the engine to draw air in?

   No, If I remember my aerodynamics theory correctly, there is a build-up of pressure at the base of the windscreen which is partly why they have the intake for the ventilation system there.
   The old American muscle cars often had a rearward facing induction vent on the bonnet to use the same principle.
4. RyanSaxo Established Member Joined: Jul 2007 Midlandzzz Posts: 1613 The 'S

   #4 13th April 2012, 19:13

   Quote:

   Originally Posted by TomiX No, If I remember my aerodynamics theory correctly, there is a build-up of pressure at the base of the windscreen which is partly why they have the intake for the ventilation system there. The old American muscle cars often had a rearward facing induction vent on the bonnet to use the same principle.

   yeah there is a build up of pressure there.
   
   I don't know how this compares with a pipe from the front of the car straight to an airbox though. I'd have thought there would be more pressure with that?
   
   not saying you're wrong at all - i like the idea of it, just trying to get my head around the theory behind it.
   
   so you're saying the build up in pressure that exists at the base of a windscreen would force the air into the system over the suck of the engine?
   
   edit - any pictures of examples??
5. user_58507 Infrequent Poster Joined: Apr 2012 N.Yorkshire Posts: 115 '00 black Saxo VTR '00 Posi blue Furio

   #5 13th April 2012, 19:20

   Try searching pics of the Saxo super 1600 rally car engine bay. They cut a big chunk of bulkhead away for the airbox to fit through into the wiper compartment.
   
   If it works for a 'factory' rally car it should work for a road car too.
6. user_58507 Infrequent Poster Joined: Apr 2012 N.Yorkshire Posts: 115 '00 black Saxo VTR '00 Posi blue Furio

   #6 13th April 2012, 19:52

   There are some good pics in this thresd;
   
   http://www.saxperience.com/forum/sho...d.php?t=356147