Quote:
Originally Posted by Nezil
Why 5mm Extended Jets?
Aquamist jets are custom machined and highly regarded, but M8 x 0.75 thread rather than the more typical 1/8 NPT threads found in the US.
Aquamist provides two M8 to 1/8 NPT Jet Adapters in their kit, which can be used directly into a charge pipe if no bungs exist by drilling and tapping 1/8 NPT threads, as long as the charge pipe wall thickness is between 1.6 to 6mm (1/16" to 1/4").
I have an FTP Charge pipe, which comes with 2 1/8 NPT bungs already welded in place. One is near the outlet of the FMIC, and the other just before the MAP sensor. These two locations are good, and I'd rather not have to create new holes in the charge pipe if I can avoid it.
Richard shared this chart that shows the required jet types for each installation method used:
I reached out to FTP and asked the thickness of the charge pipe itself, and the bungs installed and was told 2.1mm and 6mm respectively. I'd hoped that this would mean that I could use standard jets because the FTP bungs were 6mm, but on closer inspection of my actual charge pipe, it looks like the depth is more like 2.1mm + 6mm = 8.1mm, so I'm going with 5mm extended jets.
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I don't understand this. If the jet screws into the bung hole by, as an example, 4mm, then the spray hole only has 4.1mm left until the inner wall is reached. Through their diagram, the normal ones would be fine right?
I asked AA about mine and they said 2 mm thickness and a thread depth of 8mm. So I assume the jet will screw 4-6mm into the bung hole leaving 4-6 mm to the inner wall which means the normal ones are good since they say a 6mm max. I would assume this is fairly standard for charge pipes and the extenders are really for exceptions to the rule.