Explanation of injector CC and nozzle % - Ford Powerstroke Diesel Forum

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post #1 of 31 Old 04-19-2012, 08:41 PM Thread Starter
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Explanation of injector CC and nozzle %

For example 190/75's flow 190 CC of fuel and the nozzle is 75% bigger than stock correct? So would a 175/100 flow the same as a 190/75? Or how would a 155/75 compare to a 155/100? Just trying to figure out how the CC and % affect performance and how to decide on the best ones.

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post #2 of 31 Old 04-19-2012, 09:41 PM
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A 175cc injector will flow 175cc worth of fuel, a 190cc injector will flow 190cc worth of fuel no matter what nozzle.

Nozzle size determines how fast the body will empty.
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post #3 of 31 Old 04-19-2012, 10:11 PM
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So will 190s w/ stock nozzles be faster then 175s/ 100%

Or only in the low end power I assume!




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post #4 of 31 Old 04-20-2012, 04:40 AM
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I'm wondering the same thing. Maybe asked differently... is the % calculated more for how you'll be running the truck, I.E. Drag racing where the sticks have less time to refill without HP fuel pump vs. DD where this isn't as much concern Running down the highway?

During strip racing where you have a huge Turbo providing large amounts of air, are you more concerned with getting as much fuel as possible an into the cylinders as fast as possible?


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post #5 of 31 Old 04-20-2012, 04:48 AM
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I've always wondered what those numbers meant as well. Maybe we can get some performance guys in on this thread and answer our questions.

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post #6 of 31 Old 04-20-2012, 05:10 AM
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You'll never get an injector builder putting 100% nozzles on a 155cc and 175cc injector because there will be no performance gain by going to that big of a nozzle. Actually it'll hurt ya more than anything because it'll be hard to tune. A large nozzle like that on a small cc injector will have low pulse width where you'd want to be increasing it. So that's why injector builders will only put either 50% or 75% nozzles on the smaller injectors to keep the pulse width up and make it easy for the tuner to tune the truck for the larger injectors.

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post #7 of 31 Old 04-20-2012, 05:22 AM
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So what would be the bet injectors to get for someone that currently has a stock turbo but plans on getting a larger one in the future. Can I get big injectors and have them tuned for my stock turbo and then retuned for a larger turbo when I get one?

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post #8 of 31 Old 04-20-2012, 05:29 AM
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I ran my 190/75's with my stock turbo for nealy 2 years with no issues what so ever. You can have some fuel pulled so that it wont be too hot or smokey. I know there has been some with 190/100's with stock turbo and have been good. Just have some fuel pulled. I definitly wouldn't go any larger than a 190cc injector tho. My 190/75's and the 64/71/70 non vgt i'm runnin now are great with each other. Not too much smoke at all and the fuel is maxed out in my race tune Eric told me.

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post #9 of 31 Old 04-20-2012, 05:52 AM
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I have a question related to nozzle size. I understand the whole percent larger than stock, and which ones empty faster etc. It seems to be proven, that a larger nozzle size will make more power (190/100s make more power than 190/75s everything else equal). Because diesels are designed to run way lean from the optimum air fuel ratio of 14.7 ish, wouldn't having a longer pulse width, so a slower emptying injector, cause more of the fuel to contact more air particles for a more complete burn, and more consistent force on the piston equalling more power? Kinda like with rifle rounds, the faster rounds use a slower burning powder.

It seems that this apparently isn't the case, but why is that? If having more pulse width would yield more power, wouldn't having a smaller nozzle size make that possible?

Just thinking out loud

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post #10 of 31 Old 04-20-2012, 07:10 AM
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From what I have read and picked up from talking with various people about injector sizes and nozzle sizes, it appears that the size/configuration of the injector is such that it will allow a certain amount of fuel to be injected into the combustion chamber at the right time (which gets shorter and shorter as rpms increase) to make the most power. Basically this means sure you can run a 190cc injector with a stock nozzle and it will put more fuel into the cylinder at low rpms. That is because there is more time available to leave the injector pulsed longer than say when above 3500 or even 3000 rpms. At this speed the engine is spinning much faster and there isnt enough time available to leave the injector pulsed therefore a larger nozzle would be required to realize all the available fuel in the larger bodied injector.

I guess I would look at it this way. If the injector body size is increased, then the nozzle must also be increased (I would presume relatively proportional to the increase in body size over the stock injector). If anyone has to have a formula that predicts nozzle size, I would say take [(new injector size-stock injector size)/stock injector size]*2.4*100%= nozzle size for new injector. It isnt perfect but its close and seems to correlate with what guys are running or think folks should run. It basically puts 30% nozzles on 155s, 75% nozzles on 175s, 100% nozzles on 190s, 125% nozzles on 205s, and 150% nozzles on 225s. I really think once you get above 225cc anyways you are going to be looking at a hybrid injector. Does this mean you cant run other size nozzles than these? Of course not but I think most will agree that 75% nozzles are optimum for 175s and 100% nozzles are optimum for 190s and I have seen 155s offered with both 30% nozzles and 50% nozzles. This would also allude to larger than 100% nozzles being needed to realize the full capacity of injectors that are larger than 190cc. These are just my opinions and things I have gathered from reading and talking with various folks about our injectors.

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