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has anyone on here had any exsperience with 8 whole injectors? good or bad please share thoughts and oppinions thanks kurtis
8 hole injectors
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71 Posts
i am looking at some 250 nozzles on ebay and they say they are 8 whole nozzles just wanting some feedback thanks again
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6,585 Posts
i ran injector parts 8x.011's (200's) for a while. the best "dollar per horse power" mod i have done yet. i made 457hp on a drag comp, water/meth and those sticks on a hx35 :thumbsup:
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1,472 Posts
i would recommend 7 hole because of the spray pattern and nozzle integrity
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5,772 Posts
What he means in regards to nozzle integrity is you only have so much material at the nozzle to play with and punching an extra hole in there means there is less meat holding the nozzle together. People have been known to have the nozzle ends break off. Realisticaly thinking about this further, having 250hp 7 hole injectors, the same cross sectional area will be punched as 8 hole injectors of the same rating. hmmmm.
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13,057 Posts
the II nozzles are not all the same size hole. the 8holes are decent, but its not just the tip, its how its set up, cleaning of injector + pop of pressure + matching.
Usually by the time you get a set of nozzles installed full injectors would be about the same price.
Usually by the time you get a set of nozzles installed full injectors would be about the same price.
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1,316 Posts
The port size has nothing to do with the tip breaking off. The port size is SO TINY it makes no difference at all. Bad designs cause this kind of failure.
As to number of ports, it makes little difference. Bosch played around a lot with this, and settled on the 7 port. Combustion efficiency DID increase over the older 2 port tips of the 12valve, though.
Installing tips only is cheap and easy if you keep everything really clean, your tip quality is adequate, and your original pop pressure was fairly balanced to begin with. The pop pressure should change very little with the installation of tips, but I highly recommend carefully torquing your tips evenly, as the tapered threads (like pipe threads) can allow different depths which could affect pop pressure.
If it can't idle after installation, you either contaminated a tip (they are VERY VERY unforgiving of contamination-those ports are TINY) or the pop pressure will need to be adjusted. Pop pressure is set by applying pressure to the injector in a bench test and determining at what pressure the valve in the injector is overcome by the pressure. It is adjusted by changing shims on the spring that closes off the needle/seat valve in the tip. The actual pressure doesn't matter much, but it's very important that the injectors pop at the same pressure.
As to number of ports, it makes little difference. Bosch played around a lot with this, and settled on the 7 port. Combustion efficiency DID increase over the older 2 port tips of the 12valve, though.
Installing tips only is cheap and easy if you keep everything really clean, your tip quality is adequate, and your original pop pressure was fairly balanced to begin with. The pop pressure should change very little with the installation of tips, but I highly recommend carefully torquing your tips evenly, as the tapered threads (like pipe threads) can allow different depths which could affect pop pressure.
If it can't idle after installation, you either contaminated a tip (they are VERY VERY unforgiving of contamination-those ports are TINY) or the pop pressure will need to be adjusted. Pop pressure is set by applying pressure to the injector in a bench test and determining at what pressure the valve in the injector is overcome by the pressure. It is adjusted by changing shims on the spring that closes off the needle/seat valve in the tip. The actual pressure doesn't matter much, but it's very important that the injectors pop at the same pressure.
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11 Posts
turbolvr.... got a question for you. i just bought some injectors off ebay they are supossed to be 200 ddps. they are 8 hole injectors. I always thought ddp were 7 holes. do you have any experience with them? thanks
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887 Posts
I run a set of honed 8x.012s that I got from RCP Diesel and I love them. Very smooth power, fairly clean for that big of an injector, and they don't really get that much hotter than my Jammer 5's did.
Eric
Eric
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