79jasper
Chickenhawk
Lol was just a thought. Figured would get expensive.
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7.3 return line caps
- Thread starter ISPKI
- Start date
IDIBRONCO
IDIBRONCO
I've done this a lot of times. I found that if I tried to cut them to the exact length needed, invariably, I'd always cut some short. To this day, I still cut them slightly long. Maybe not 3/8" but still long.
ISPKI
Welding/metallurgical engineer/Metalsmith
Seems to me that, with all the new metal printers out there, these could be made for far cheaper than 500$. We could certainly weld these together at my work for only a few dollars each. I could inquire and see how much it would cost to have them machined out of solid metal stock. My guess is that they wont be too bad, but will certainly be more expensive than the shoddy plastic caps.
Does anyone have the critical dimensions available? My company has been looking at getting into new markets...
If you have a cap, you have the dimensions...
Yep. Buy a cheapo set. Test fit all of them on an injector, to find the best fit. There you go, use that as the template for dimensions.
Don't forget the chamfer on the inside bottom, so that it will slide over greased o-rings, instead of taking a bite out of them.
I have been wondering about buying strong tubing. (Not pipe. Pipe is usually welded and has a seam.) If I could find the right inside diameter.
Then cut to the right length. Chamfer the inside bottom. Drill holes in the appropriate places. Then silver solder or braze smaller tubing for the nipples. Even JBWeld would probably work. These things don't get THAT hot...
Got to be able to do even that for a lot less than 500 bucks...
Pretty sure you should be able to find "hobby tubing" in the correct sizes fairly easily...
And brass or even aluminum tubing should be stronger and more resistant than plastic.
onlinemetals.com
ISPKI
Welding/metallurgical engineer/Metalsmith
It would be nice if someone were able to get their hands on manufacturing dimensions so that we could see the actual tolerances. Reverse engineering a poor quality piece of plastic isnt going to yield better quality parts, just making them out of metal is not good enough.
If possible, we would likely laser weld the parts together but the real difficulty is creating the two O-Ring grooves inside the sleeve. Since the part doesnt really have anything else to hold onto, those grooves need to be fairly precise and without razor sharp edges, but cutting them and then deburring them would be time consuming. I could see being able to make a full set in 1 hour, but at my company's burden rates, we would be up around 200$ plus the material costs (roughly 8$ea).
If possible, we would likely laser weld the parts together but the real difficulty is creating the two O-Ring grooves inside the sleeve. Since the part doesnt really have anything else to hold onto, those grooves need to be fairly precise and without razor sharp edges, but cutting them and then deburring them would be time consuming. I could see being able to make a full set in 1 hour, but at my company's burden rates, we would be up around 200$ plus the material costs (roughly 8$ea).
Jake60
Full Access Member
I replaced my lines the other day, the old ones must have been on there a very long time because most of them were worn so thin the tops of the caps broke off in little rings.
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jrollf
Full Access Member
If you want to get rid of the Caps, R&D has billet fuel rail replacements.
http://www.idiperformance.com/store/p85/Billet_Injector_Fuel_Return_Rails_.html
1993 F350 Crew Cab Dually
XLT
7.3 Factory IDIT w/Banks Sidewinder
5spd Manual
http://www.idiperformance.com/store/p85/Billet_Injector_Fuel_Return_Rails_.html
1993 F350 Crew Cab Dually
XLT
7.3 Factory IDIT w/Banks Sidewinder
5spd Manual
Most of us are aware of the R&D rail. Some have had difficulty with them. Looking for what some (myself included) woud consider a better option...
Would seem like a somewhat better option would be very flexible, as in PTFE, tubing with some slack between injectors so no stress on joint or cap. Tubing would not have to be cut exactly to length and would withstand fuel/temp better.
Sheesh have you ever priced PTFE?
That stuff is expensive. It'd be neat but probably twice the cost of the R&D rails.I was very shocked when I found out how expensive PTFE is!
I just looked quickly online.
1-1/2" 6061 square aluminum stock is like $12/foot.
1-1/2" square PTFE stock is $125/ft
1-1/2" 6061 square aluminum stock is like $12/foot.
1-1/2" square PTFE stock is $125/ft
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