It's only relevant to a rotary engine as the combustion temperatures are lower than that found in a reciprocating engine. The idea is that combustion continues in the exhaust to reduce the unburnt fuel released, which usually happens anyway in a reciprocating engine due to the higher combustion temperatures.

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Rich

also the m3 evo's had them. when I had mine up on the ramps we disabled it as it was making a horrid noise but it still passed MOT's on the emissions side

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306 rallye reproduction decals (full sets/individual decals) | 306 b-pillar textured vinyl weatherstrips
306 slam panel esso stickers | 306 yellow / orange / pension fund red side door badges
gti6 inlet manifold badges | 306 rear boot badges (p2/p3)
winner of Extraction of toys from prams with outstanding vigour award 2009 [source: gti6 owners club]

Might as well employ a midget to blow in the intake.

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Ex- Phase 3 China GTi-6 T-Reg

: Fair point

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Ex- Phase 3 China GTi-6 T-Reg

I've seen these on BMW's. Apperently they introduce fresh air into the exhaust before the cat and the extra oxygen helps it to reach opperating temperature quicker resulting in the cat being able to reduce hydrocarbons and co. These pumps can become very noisy when they wear out and sound like a ten year old vax on full chat for about a minute after the engine is started. Basically its to reduce cold start warm up times.

If your car isn't likely to pass its emissions test then it would probably benefit more from a new lambda sensor/green temp sender/cat.

The limits are quite lenient anyway so I don't understand why you should need this on an old Peugeot.

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