I have an inline four in my van, but it uses the regular Vanagon air filter. To get clean and cool intake air, I ran a brake duct hose up into the right hand corner engine bay vent hole. You can get flexible brake duct from auto supply houses or race supply sites. I simply ran a bit of wire down into the louvers from the outside till it emerged into the engine bay. Then I attached that wire to a length of brake duct hose that was clamped onto the airbox inlet. Pull the hose back up into the corner of the body with the wire and neatly attach it up inside...cut off the excess wire and you have a 'fresh air snorkel' up away from engine heat and most of the dust. Using the same diameter hose as the inlet into the air filter doesn't reduce the volume of air. Getting it from the outside, it's much cooler than taking air out of the enclosed engine compartment.. Cool fresh intake air was worth (dyno confirmed) almost 10 additional hp on my other car..about 4% improvement in power.. Don Hanson |
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