Air movement, How much air does a 911 fan move Options

[914 Ranch]

There's got to be a number on that somewhere. I know that there are a few different fans but what I was thinking about is how many CFM do they move. I was just thinking about the air flow out of the back of a car. If the air exiting from the engine is so high that I can't remove it from the car that I will need to move it out through some sort of diffuser. I would like to have no air build up under the rear of the car. Speaking of exhaust I have no idea what I'm going to do for it. And all of this still will need a diffuser. The fans in the oil cooler move 3200 CFM, I am just hoping that that would be enough.

[914 Ranch]

Thanks Bert. Hey Scott, I'm just looking to evacuate the engine air. I just ordered enough aluminum to flat bottom the car back to the engine bay. I don't know where I'm going after that. But that is just like everything else in the car. I have no idea what I'm doing. I'm just winging it. But that should get me to the diffuser. The only thing I can be certain of is I will have to do something with the exhaust. Right now I am working on the exhaust fan housing. Scribing it to the trunk.

[stownsen914]

Cool. Putting a diffuser on a 914 is some WORK. But I enjoyed it. First I had to make a custom exhaust (regular 914 headers are right where you want to put a diffuser), and I had to make a custom shift rod to get it out of the way too. Making the diffuser was a bit of an exercise.

Speaking about evacuating the spent engine cooling air ... a diffuser / flat bottom does block the spent cooling air existing the bottom of the engine. I saw oil temps go up 20 degrees after I put on the diffuser (which included a flat bottom that extended under the engine bay). And the engine bay was getting hot as hell. I wound up making some engine tin to direct the air out the sides and put louvers in the side of the rear fenders. Made things better.