Porsche 911 Spark Plug Holder

This spark plug holder is designed for all flat six Porsche 911 engines. It is available for 6 plug and 12 plug engines.

Its main purpose is to organize the plugs so each plug is matched to the cylinder it came from. This is useful for a number of reasons:

1) It allows easy visual comparison of all 6 or 12 plugs, as they are grouped together in a tight pattern allowing the owner to identify slight plug tip color changes or other indicators of engine health.

2) It allows photographs to be made that easily identify which cylinder each plug came from. Helpful for tracking long-term slight changes of plug color and condition.

3) It allows for each plug to be re-inserted into the same cylinder it was removed from. (assuming removal was temporary)

4) It provides a convenient long-term storage for plugs while maintaining a match between plug and cylinder it was removed from.

5) It's just a cool gadget.

The holder design makes it virtually impossible to put a plug into the wrong hole by using an iconic representation of the flat six engine, along with the Porsche cylinder numbers printed with raised embossed numbers 1-6.  There are two versions of this holder, one is labelled as being for the LOWER bank of spark plugs and the other is labelled as for the UPPER bank of spark plugs. This was done to accommodate dual-plug engines. Other than the label, they are identical.

The holder was designed for Beru spark plugs with a porcelain body diameter of ~10.5mm. I am not sure if other brands use the same diameter. The holes can be enlarged with a drill or reamer, or you can edit the STL file.

You will need to obtain metric flat head screws to assemble the upper and lower platforms. The screws are M6-1.0 x 45mm in length. You will also need two nuts.

For Printing:

I used PLA filament at 20% infill on my Creality Ender 6 printer. It printed fine at 100mm/sec.

I did not use any supports but be advised that the blind hexagon nut cavities will need some hand cleanup unless you use supports for the hex. If your printer supports a printer pause, you can insert the nut during the print process.

Depending on your printer and its accuracy it may leave a very slight vertical ridge in the holes that can be removed with a few strokes of a round file if the spark plug does not fit the hole.

My printer does not support dual filaments so I just hand painted the white on top of the embossed letters and numbers. I found a small foam brush was quick and easy. I used my wife's tole paints because it dries fast and if you make a mess it is easy to wash off with water.

Link to LOWER spark plugs holder below: