Injection pressure and the various types of injectors - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 17 (permalink) Old 02-10-2008, 06:15 PM Thread Starter
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Injection pressure and the various types of injectors

I making this post to see if other people agree with me or not and what other peoples theories are. Not trying to start a war so please keep the bashing to a minimum. The faster the fuel is pushed through the nozzle the more pressure there will be at the nozzle. I think that hybrids have the most pressure cause they will push more fuel for a given amount of oil than an A code or b code there for it will expel fuel faster hence more pressure. Does anyone agree with me?
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post #2 of 17 (permalink) Old 02-10-2008, 07:48 PM
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Re: Injection pressure and the various types of injectors

No i don't agree. From what i understand, you're way off.

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post #3 of 17 (permalink) Old 02-10-2008, 08:11 PM Thread Starter
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Re: Injection pressure and the various types of injectors

The IP numbers that people say that come from the 5:1, 6:1,and 7:1 I believe are way incorrect. Like 3000 icp in an a code would in theory have 21,000 psi I believe that that would only be accurate if the nozzle were not releasing fuel. When the nozzle opens and releases fuel there is a pressure drop and since the hybrid pushes fuel faster it is able to keep its pressure higher while the nozzle is open. I hope that what I am getting at make ssome sense if not I will try to explain more.
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post #4 of 17 (permalink) Old 02-10-2008, 08:22 PM
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Re: Injection pressure and the various types of injectors

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Originally Posted by thedieselkid View Post
The IP numbers that people say that come from the 5:1, 6:1,and 7:1 I believe are way incorrect. Like 3000 icp in an a code would in theory have 21,000 psi I believe that that would only be accurate if the nozzle were not releasing fuel. When the nozzle opens and releases fuel there is a pressure drop and since the hybrid pushes fuel faster it is able to keep its pressure higher while the nozzle is open. I hope that what I am getting at make ssome sense if not I will try to explain more.

Actually when the nozzle opens it is at a lower pressure than peak. This is called nozzle opening pressure which is I think some where between 3 and 5,000psi. Also restriction to flow causes pressure. So the smaller the nozzles the higher the psi on any injector.

Just my .02 if Im wrong I am sure some one will correct me

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post #5 of 17 (permalink) Old 02-10-2008, 10:56 PM
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Re: Injection pressure and the various types of injectors

chad - i dont think you're the first one to think that hybrids are getting higher IP. there's been some discussion about this in the past.

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post #6 of 17 (permalink) Old 02-10-2008, 11:20 PM
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Re: Injection pressure and the various types of injectors

anyone know what the fastest injectors are?
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post #7 of 17 (permalink) Old 02-10-2008, 11:35 PM
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Re: Injection pressure and the various types of injectors

MM SHO??

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post #8 of 17 (permalink) Old 02-10-2008, 11:36 PM
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Re: Injection pressure and the various types of injectors

Dave, there your's, they went 129 mph..
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post #9 of 17 (permalink) Old 02-10-2008, 11:38 PM
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Re: Injection pressure and the various types of injectors

Please tell?

Since in theory, B-codes run the highest nozzle pressure(from what I think I've read on here) does this mean they are the most efficient injector(best mpg)? Hope so, that is what I am set on buying next.
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post #10 of 17 (permalink) Old 02-10-2008, 11:50 PM
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Re: Injection pressure and the various types of injectors

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Please tell?

Since in theory, B-codes run the highest nozzle pressure(from what I think I've read on here) does this mean they are the most efficient injector(best mpg)? Hope so, that is what I am set on buying next.
I have found that MM's will give better mileage results over BD's with the same 28lpm EH tips.. I have also found that I can get almost the same mileage with more available power when I install 12 thousands EDM tips on the same MM's.
My opinion is that a person needs to look at the overall combination of parts vs a single aspect as in which injector to run.
A great combination of parts can be a disaster with the wrong tuning.
I remember back when it was said hybrids were not the answer but 5 years later they are still the best bang for the buck as far as power and fuel economy go.
That said our BD stage 4's have been proven to make the most power.
Once the dragster is race ready we will be able to learn a lott more a lott quicker.
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