Quote:
Originally Posted by panda529e699
Hello
Just out of interest, wondering how the air filter housing works, 740 B230E K- Jet.
It has a metal pipe to the exhaust manifold, and a larger pipe to the front of the car. The metal pipe has broke in half. I presume its to allow the engine to warm up quicker using the heat from the exhaust, just not sure if this one works, I put some heat down the exhaust air inlet, and the flap remained closed. Thought might get a few more horses if it works correctly.
Thanks
Andrew
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The idea is the thermostatic flap valve in the part that combines the cold air intake and the heated air intake from the exhaust manifold heatshield allows for a faster warm up and prevents manifold icing in winter while mantaining an average temperature in the summer.
In practive they very often fail and will only admit hot air.
You will get the most power using cold air only as cold air is more dense than hot air, however you will notice hesitancy and flat spots in the winter witha lack-lustre performance.
If you renew the corrugated aluminium hose before winter and only connect it to the thermostatic flap valve when the weather gets colder and you start experiencing hesitancy/flat spots and disconnect again come spring next year, you'll emulate (for the most part) what the thermosttic flap valve is meant to do.