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Originally Posted by sailor15015
Would you guys mind explaining how you made those wonderful devices? I'd really love to be able to set my own injectors. That way I know I've got them right.
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Check out this post for the BOM of the bottle jack style:
http://www.peachparts.com/shopforum/showthread.php?t=130074&highlight=NPT+metric (#10). Note that there is a high pressure 3/4" x 1/4" NPT reducer bushing available from McMaster that will simplify the 3/4 x 1/2 and 1/2 x 1/4 reducer bushings. Not too difficult, but I did have access to a lathe for drilling and tapping the bottle jack for the 3/4" reducer bushing.
The jack is disassembled by removing the large hollow nut which the ram passes through, and the ram discarded. The ram seal is discarded from the large top nut, and the top nut hole is enlarged for the 3/4" NPT threads. The nut also has a relief hole which must be tapped and plugged with a set screw using JB weld. The inside pipe where the ram slides up and down also had a small pinhole in the threaded region, which I MIG welded from the inside ...probably could just slap some JB weld on it too (from the inside only!). I also drilled and tapped the external jack fill hole (previously plugged with a rubber stopper) so that I could JB weld a 1/8" NPT fitting for a reservoir to add biodiesel during testing. Reassemble the jack using JB weld between the top nut and the inside pipe threads, and also use JB weld for the 3/4" NPT joint, since there isn't much contact area inside the nut for the reducer bushing.
I still am trying to stop the leaks at the other NPT joints where I used non-permanent sealant.
I'll post some pics of my own so you can see how it goes together...