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Old 02-21-2008, 08:19 PM   #1 (permalink)
DieselPro
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Marine Injector Mythbuster

"Marine injectors" make 40 more hp?



Stock tip # 304
Marine tip # 311
-----------------------------------------------------------------

Stand set to 70 cc fixed using test calibration nozzles
------------------------------------------------------------
3,000 rpm
_________

311
130 bar 69 cc
142 bar 67 cc
146 bar 65 cc

304
142 bar 64.5 cc

1,600 rpm
__________

311
130 bar 41 cc
142 bar 51 cc
146 bar 46.5 cc

304
142 bar 49 cc

Conclusion: Marine injectors basically put out the same amount of fuel unless you drop the popping pressure to stock specs.

Marine injector output drops dramatically at low speed especially if you drop the pressure real low. Pressure plays a critical role with different combinations.

Atomization does not appear to be affected by the slight pressure changes. If anybody has a simple way to verify atomization please let me know.

These specs really need a graph, so somebody can jump right in and make one.

Some tests were not performed on the stock nozzles because that's not what this subject is about and it takes to long to test all the possibilities.

Myth > Busted.

Someone told me Army injectors make more power, but that might be just a myth.


Last edited by DieselPro; 02-21-2008 at 08:21 PM.
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Old 02-21-2008, 08:26 PM   #2 (permalink)
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Injector Numbers
BOSCH
New #-----------Body #----Reman----Tip-----Pressure---Application
0432217081....0430211051...NA50X...0SD248....126 bar......6.2L 1982
???????????.....0430211058...NA52X...0SD253....126 bar......6.2L Long body
0432217092....0430211054...NA51X...0SD253....126 bar......6.2L Short body
0432217229....0430211054....??????...0SD304....126 bar......6.5L N.A.
0432217251....0430211054....??????...0SD304....142 bar......6.5L Turbo
0432217255....0430211054....??????...0SD311....150 bar......6.5L TD Marine
0432217275....0430211097....??????...OSD304....126 bar......6.5L N.A.
0432217276....0430211097....NA56X...0SD304....142 bar......6.5L Turbo

"bar" is equal to 1 atmosphere - multiply 14.7psia by the number on each line to determine actual injection pressure

Delphi Injectors
6703803---6.5 T.D.
6703802---6.5 N.A.
6703801---6.2 "Van" Short fine thread
6704001---6.2 Long fine thread.

Standyne Injectors (New)
37818 10233973 6.5L T.D. same as 0432217276 6703803
38272 10233972 6.5L N.A. same as 0432217275 6703802

* Info has not been verified but is believed to be accurate till somebody proves otherwise.

Try get'n this info anywhere off the net.

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Old 02-21-2008, 08:28 PM   #3 (permalink)
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Your results show that at 142 bar the marine nozzles dump more fuel than OE.

When I bought my HO injectors from Heath I was told that pop pressure was stock - only change was the nozzle.

Myth completely busted? Depends on pressure....like you said....
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Old 02-21-2008, 08:39 PM   #4 (permalink)
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3.5 cc difference in output is only achieved when the pressure is changed to stock. Marine injectors are set higher than stock and output remains vertually the same. If you use factory settings for both marine and stock the difference is nothing. So myth busted.
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Old 02-21-2008, 08:54 PM   #5 (permalink)
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I'm not familiar with your test equipment. Any injector test equipment for that matter. Marine's are reported to work with a modified ECM. The 70cc test stand you used is more like a Factory program. Would a 85-90cc stand show different results?
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Old 02-21-2008, 09:05 PM   #6 (permalink)
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Re-graph....this time it should be right...
Attached Files
File Type: xls Book2.xls (15.0 KB, 659 views)
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Old 02-21-2008, 09:07 PM   #7 (permalink)
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A test of 80 mm^3 at 3000 RPM would be great if possible...
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Old 02-21-2008, 10:54 PM   #8 (permalink)
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Quote:
Originally Posted by Billman View Post
I'm not familiar with your test equipment. Any injector test equipment for that matter. Marine's are reported to work with a modified ECM. The 70cc test stand you used is more like a Factory program. Would a 85-90cc stand show different results?
70 cc's is the Stanadyne spec (70mm/3/stroke)

This is the max setting for the 5521 pump on the test stand with the calibrated nozzle holder assemblies designed for that specific pump. I set the pump to max setting and then recorded the results with the stock/marine injectors.

I am not prepared to do extensive testing nor do I desire to.

Point was to prove whether or not marine injectors put out enough extra fuel to produce another 40 hp. In this case it did not.
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Old 02-22-2008, 12:02 AM   #9 (permalink)
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Quote:
Originally Posted by DieselPro View Post
70 cc's is the Stanadyne spec (70mm/3/stroke)

This is the max setting for the 5521 pump on the test stand with the calibrated nozzle holder assemblies designed for that specific pump. I set the pump to max setting and then recorded the results with the stock/marine injectors.

I am not prepared to do extensive testing nor do I desire to.

Point was to prove whether or not marine injectors put out enough extra fuel to produce another 40 hp. In this case it did not.
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Old 02-22-2008, 12:15 AM   #10 (permalink)
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Thanks DP! I never understood why someone with a dyno didn't just run the numbers with stock vs. marine... Guess now I know

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