M5 Expert (>4000)
Join Date: Aug 2002
Location: Raleigh, NC
Thanked 1,507 Times in 1,031 Posts
Sorry, I would expect a better air pump with what I was pondering. One that would last.
IIRC, some cars came with airpumps that ran full time, before cats were introduced.
Perhaps some cat-friendly type solvent (Seafoam?) could be blasted through the passages from the pump back every 20k miles? Something that carbon would be soluble in, etc...
Also, yeah, air injection was popular back in the mid-70's before we had 3-way cats. It was one of the first things to go on my '76 Capri as the pump was a huge parasitic drag on the motor.
2019 M2 Competition 6MT LBB, slicktop
2011.5 M3 sedan 6MT Silverstone, slicktop: Dinan front swaybar, Eibach rear swaybar, pins-out-max-camber-up-front, Dinan exhaust, Michelin PS4S, Apex EC-7 9.5/10.5x19
2007 328i wagon Silver/gray: Eibach 28mm front swaybar, E93 M3 rear swaybar, 219M M3 wheels, Michelin PSAS3+
1975 CanAm 125MX2: Stock, original owner
Last edited by CSBM5; 12th November 2008 at 07:23 PM.