Injector nozzle thought... - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 40 (permalink) Old 01-08-2009, 05:51 PM Thread Starter
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Injector nozzle thought...

Has anyone considered building nozzles with more holes instead of bigger holes? I would think that maintaining atomization would help overall efficiency while still providing more horsepower.

Dan
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post #2 of 40 (permalink) Old 01-08-2009, 06:03 PM
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Re: Injector nozzle thought...

for what application?
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post #3 of 40 (permalink) Old 01-08-2009, 06:18 PM Thread Starter
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Re: Injector nozzle thought...

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Originally Posted by golfer View Post
for what application?
7.3L...
My thought is to get the extra fuel flow but minimize atomization loss...

Dan
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post #4 of 40 (permalink) Old 01-08-2009, 06:35 PM
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Re: Injector nozzle thought...

It wouldn't work like you're thinking. Atomization is related to the fuel pressure in the nozzle.
Enlarging the holes in the nozzle reduces the pressure in the nozzle, and adding more holes of the same size will do the same thing.

Think of it like this:
The nozzle creates this small pocket of compressed fuel (like air in an air compressor tank). Now you have an outlet of a certain size, and that oulet has a restriction coefficient. The more outlets you add of the same size, the less restriction there is to the flow out of the container. In fact, it is a direct multiple of the number of same size & shape outlets.

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post #5 of 40 (permalink) Old 01-08-2009, 06:38 PM
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Re: Injector nozzle thought...

the dodge guys have been having good results doing this for a while. 11 hole nozzles.....
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post #6 of 40 (permalink) Old 01-08-2009, 06:49 PM
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Re: Injector nozzle thought...

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Originally Posted by aggie View Post
the dodge guys have been having good results doing this for a while. 11 hole nozzles.....
but not in the HIGH hp stuff...they go back to 5 holes.

The Crummins guys tighten up the spray angle on the nozzle so that they have more (mechanical) time to get the fuel into the piston bowl...lots of injection advance...

more holes, with a tighter spray pattern creates some issues with the nozzle spary (plumes of spray) fanning out, overlapping, and the fuel droplets combining (pre-combustion) creating very poor burn characteristics.
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post #7 of 40 (permalink) Old 01-08-2009, 07:06 PM
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Re: Injector nozzle thought...

so will the powerstroke guys ever get this technology?

it would be nice to have a tigher spray pattern as you mentioned, for the exact reason you mentioned above. would also be nice to play with more smaller holes for a performance/towing setup of sorts.

would also be nice to be able to play with the spray pattern of the nozzles to match piston bowls that have been reworked...
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post #8 of 40 (permalink) Old 01-08-2009, 07:42 PM Thread Starter
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Re: Injector nozzle thought...

yes, pressure is a big part of atomization, but I thought that outlet size was too...

Dan
96 Powerstroke: 6637, downpipe to dump exhaust, 140v IDM and a shift kit.

84 Honda Sabre V65 1100: pipes, jet kit and new tires. Faster than I think I'll ever need.
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post #9 of 40 (permalink) Old 01-08-2009, 07:46 PM
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Re: Injector nozzle thought...

Quote:
Originally Posted by golfer View Post
but not in the HIGH hp stuff...they go back to 5 holes.

The Crummins guys tighten up the spray angle on the nozzle so that they have more (mechanical) time to get the fuel into the piston bowl...lots of injection advance...

more holes, with a tighter spray pattern creates some issues with the nozzle spary (plumes of spray) fanning out, overlapping, and the fuel droplets combining (pre-combustion) creating very poor burn characteristics.
I had talked to Lenny at DDP about this a while back and he said the same thing. He didn't seem to think there would be any advantage.

Dennis Schroeder - Co-Owner of Strictly Diesel

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post #10 of 40 (permalink) Old 01-08-2009, 08:04 PM
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Re: Injector nozzle thought...

Quote:
Originally Posted by aggie View Post
so will the powerstroke guys ever get this technology?

it would be nice to have a tigher spray pattern as you mentioned, for the exact reason you mentioned above. would also be nice to play with more smaller holes for a performance/towing setup of sorts.

would also be nice to be able to play with the spray pattern of the nozzles to match piston bowls that have been reworked...
whose to say we don't have this technology?
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