Eh or edm nozzles?
- Thread starter cjfarm111
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C'roy78stroker
Member
There have been a few threads discussing this... Iirc, the last I read said the nozzles now are eh'd. I don't think any that we use are edm'd anymore but I hope I'm wrong. Used to be the best nozzles were edm'd then barely eh'd to clean up the holes, not so much for increasing the size of the hole. I'm going off of older information so hopefully something has changed since. A concern with eh machining was if the media were to flow through one more holes with less restriction then any others, it could cause inconsistent sizes of holes within the nozzle.
I have fuzzy memories about how there was a theory about this a while back that someone brought up, I can't remember who, and not sure if anyone ever put it to the test. But it was an idea that an EDM hole has a rougher surface than the finish of an EH hole, and that the fuel coming out of an EH hole wouldn't atomize quite as well if it was too smooth. Something to that effect. Meaning that EDM injectors would actually idle and drive cleaner than EH nozzles.
I could be wrong but I think a majority of the vendors are using Redat nozzles. My 200% nozzles are redats and work well enough for me. It amazes me how secretive builders are about there injectors. If I was to hand over thousands of my hard earned dollars I would want to know what type of nozzles are equipped and what grade of parts were used to rebuild the injectors. I am probably dead wrong and there is likely a few sources for oversized nozzles.
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Redat is an Italian company. Redat North America is in Flordia. DDP does there own nozzles but they are twice the price. They EH their nozzles from what I had gathered and rate them in LPM not size over stock. I had read that if nozzles are done properly they are sometimes EDM then EH'd to clean them up.
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sootie
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Charles was the one with the theory that the fuel atomized better with edm due to the roughness.
Personally I prefer eh as it it more accurate.
Personally I prefer eh as it it more accurate.
old man dave
New member
DI once said that the EHs made less smoke but the EDMs had a better throttle response and somewhat more smoke.
johnp115
Active member
Yes an EDM made part with no other finishing processes will have a rougher surface finish than an extrude honed part generally. The material removal process in EDM is caused by spark erosion and it creates little cavities which give the "rough" finish
That part I knew, but it's good explain the differences for those who don't.
In terms of fuel atomization how does that play out? Does the theory have any merit behind it?
johnp115
Active member
i haven't taken fluid dynamics yet, but in my mind i could see that maybe the rough surface/cavities disturbs the flow and creates a little more restriction at the nozzle, which in turn could help raise the pressure of the fuel right there in the nozzle and when its sprayed. but thats just me thinking.
04stroker
New member
For most yes. But any injector builder can get you about any nozzle you want. But it would most likely be considered "custom" if you wanted a one off size and more exspensive. We can get any size nozzle done for the most part without about any method you want. It would just cost more.
