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  #1  
Old 05-19-2011, 11:08 AM
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injector modification...

I HAVE NO EXPERIENCE WITH PERFORMANCE MODS


just thought I'd put that out there up front.

I was driving on the highway thinking... I know dangerous territory, but I digress...
modern bluetec and other DI motors have several reasons for massive HP... but fuel atomization and delivery/control are the biggest ones I think...
I'm wondering if having an injector with more than one point of fuel spray would improve combustion/burn...

like an injector with 3 or 4 nozzels instead of one. perhaps with different spray pressures on them, so a short burst, large burst, and medium burst... timing would be interesting, but how would something like that be worked? I think injectors are pressurized to have pulses during stroke... why not pulses on multiple nozzels in the PC?

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Old 05-19-2011, 05:28 PM
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I believe IDI's are restricted to a single jet of fuel directed at the impingement ball. You can improve injection efficiency by installing larger pump elements which of course, has the potential to injector a larger quantity as well as shortens injection duration.
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  #3  
Old 05-19-2011, 07:07 PM
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Modern, electronically controlled injection systems can(and do) do multiple injections for each power stroke. Our mechanical systems can not.

From what I have read and learned injectors seem to be good for at least 300hp on the 617 engines. injection pumps need mods (bigger elements)to make that, and a differant turbo.

There is a good thread about pc modification, this is next on my list, and may well be followed by bigger elements.
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Old 05-19-2011, 08:41 PM
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VW TDI's (starting mid 90's) used injectors with 5 hole nozzle tips and 2 stage pop (pilot and main injection) by using 2 sets of springs in the injector.
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Old 05-19-2011, 08:47 PM
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The om606 has two stage as well.
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Old 05-19-2011, 09:02 PM
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Is that 2 stage happening at the injector or the element or DV?
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Old 05-19-2011, 09:14 PM
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2 stage is at the injector.
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  #8  
Old 05-19-2011, 10:20 PM
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Can't use those VW TDI injectors in the 617. You can use the non TDI two stage and they produce a very quiet engine and more power on the upper end, less on the low end. I have such a set, but with the Myna pump and stock turbo I think I'd rather have the low power back. I may switch with my wife's car stock injectors soon.
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  #9  
Old 08-09-2011, 02:05 AM
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Quote:
Originally Posted by MTUpower View Post
Can't use those VW TDI injectors in the 617.
Not TDI, the 1.9L AAZ engine. They are the correct threads and design on both ends but require an MB /240 or 265 nozzle to be used inside.
Here are the injectors I installed.
http://www.youtube.com/watch?v=6hmGSMiDo98

The biggest problem is finding an injection shop capable of adjusting both stages. All the engines they're used in are Canadian so finding a local option is next to zero chance, thats what made me give them up.

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