[W126 Coupe] cold air induction on 560

[Divov]

Hi Clay,
I'm interested in following your post as I am racing a standard 500 SEC at the moment.
The 500 air filter only has 1 air intake horn whereas the 560 has 2.
However, where the 560 air intake is at the air filter it is quite a large oval section which reduces to a much smaller cross section round pipe -
75mm id on left and 53mm id on the right. This doesn't make a lot of sense to me. What were the manufacturers thinking?
Surely the trick would be to fabricate new 'horns' that ended with a round pipe with an area equal to the total cross sectional area of the oval intakes leading into the air filter pan?
One thing I know for sure is that using concertina type hose stuffs the airflow big time. You gotta use smooth pipe.
Just drilling out the pop rivets and removing the horns altogether might help except that now you're inducting hot air.....Might not be too clever.
I run a standard paper element as I seriously doubt that a K & N element is going to give any appreciable power increase. Maybe I'm wrong. Do any forumites have positive dyno results that prove otherwise?? Bucks to power gain ratio questionable?
Next race I am going to use my 560 air filter base on my 500 - but I am going to modify the horns.
It's going to be hard to tell if there is any improvement from that as we are busy ditching the self levelling rear suspension, lowering the car and fitting stiffer springs and shocks and changing to wider 16" rims & tyres. That's too many changes at once, so what really is helping is going to be difficult to evaluate based on lap times. I actually need dyno time.
We race again on 24th March so I will report back after that.
Regards
Alec Divov

  ----- Original Message ----- 
  From: clay 
  To: mbcoupes 
  Sent: Wednesday, February 07, 2007 7:38 PM
  Subject: [W126 Coupe] cold air induction on 560


  Hi Guys,
  Do think there would be a power gain as in cold air induction if I took off my stock air cleaner that I have a K&N filter in now, and changed it to a stock 380 filter that only has the one large opening 3" the same size as the kits and they have the parts that you can buy to put one together that would sit right into large space on passenger side engine bay. It would use exiting evap hoses,so no building there and just use the 4" to 3" reduction mount,L-bend hose,1 short straight pipe, and then the cone shaped K&N cone filter. Instead of the two stock inlets that don't really connect to the outside that well. Any input before I spend the $100.00 to $150.00 for nothing just to give it a try ?
  Regards, Clay

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