Air Box Hole on MKII

[GolfVenture]

Anyone know why there is this hole in the air box of an MKII. Both my 89 and 91 VR has it.

[skydoc_17]

Hey Brian,

The Air Box is an Injection Molded part. Plastic "beads" are melted and forced into a 2 piece mold, the mold is opened, and the part (Air Box) is removed. The area in the mold where the molten plastic is injected leaves a "stem" that is removed by a "trimmer" after the molding process. If you will think back to your model building days, when you would cut all of the model pieces from a plastic "frame" before assembly, the small connector that held all of the pieces to the frame would be the stem.

Because this hole is on the outside of the filter, just like the air inlet of the Air Box itself, this hole is not a problem. I personally have used a dab of RTV to seal up this hole, and I have seen others insert a small screw in this hole. (a hack job in my opinion) I have seen a very small amount of dirt collect around this hole, and this is why I plugged it with the RTV.

If you decide to do nothing, the stem hole will cause very little problems for the intake and engine because it is located on the outside of the Air Filter. As usual Brian, you are very observant, and your quest for information is matched by few. This was an excellent question.

Earl

[GolfVenture]

Thanks Sky_doc. I bought a new K&N filter and so was cleaning the air box after cleaning the carbs. I will fill it with some Black RTV.