2 replies to this topic

[ADRay]

In an effort to make my car run better, quieter and less smelly, I’ve revered my air filter from a K&N cone back to the stock air box. Already there is a marked difference in sound, smell and performance. What I haven’t installed is the temperature control assembly that seems to make use of the heat coming off the exhaust manifold.

My question is, how important is this part of the assembly? What would I notice differently if it were installed?

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[Spider]

In theory, they are a good idea, especially in cooler / cold climates. Being able to draw in warm air helps with low RPM smoothness and removes a flat spot you tend to get just off idle speed to about 2000 RPMs. They also help with fuel economy.

 

While they do have these benefits, where they do fall down badly is Air Flow Rates through them is poor, so you'll loose out at higher engine power.

 

Most people remove them.

[Ethel]

They were rarely connected because the duct (59)  fell to pieces more often than not. Prior to around '76 the exact same filter case had a crescent shaped snorkel that you just moved from from facing forward to pointing towards the exhaust manifold for winter. From about the introduction of the MG Metro there was a much better setup that had a vacuum motor connected to the inlet manifold via a thermal controlled valve. It only sucked hot air if the valve hadn't reached it's cut off temperature and there was manifold vacuum because you were at part throttle.

 

Obviously not Mini, but the snorkel is similar

 

A Mk1 Metro filter that does a bit of both ( and flows better)