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914World.com _ 914World Garage _ Rebuilt Engine Assembly and Test

Posted by: LotusJoe Apr 11 2012, 08:03 PM

I'm in the process of testing my engine on a test stand before installing back into the car. There are 2 outlets on the bottom of the blower that originally had flappers. In my case they are long gone. How critical, if at all are these flappers?

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Thanks

Posted by: dlee6204 Apr 11 2012, 08:12 PM

They help with the heating system. If you want heat, add them.

Posted by: Black22 Apr 11 2012, 08:31 PM

Slight Hi-jack...

If you only have heat on the Drivers side should you cap the Passenger side or leave it?

Posted by: tim_nd Apr 11 2012, 08:42 PM

I thought I read somewhere that the flaps close at idle speed, which helped circulate air directly to the engine. At the lower idle RPM range, the engine needs all available air to help cool the engine, as the car rev'd up in RPM, the flaps would open, directing air to the heat exhangers?

Posted by: McMark Apr 11 2012, 11:30 PM

The flaps only close when the aux fan goes on to keep more air in the heat exchanger system. If you leave them off, your aux fan may not blow as hard into the cabin, but otherwise they're irrelevant.