I want to build 225 Injectors - Ford Powerstroke Diesel Forum
6.0L Performance Parts Discussion What has or has not worked for you?

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post #1 of 23 Old 06-10-2013, 06:00 AM Thread Starter
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I want to build 225 Injectors

Well, actually I don't, but I have been getting a lot of PMs about what it takes to build larger ones. I keep hearing the fuel metering is improved, but to set the record straight, what is being done to build conventional injectors larger that 200cc?

The intensifier piston and plunger cuts are easy to figure out, but what is being done to the other internals? What holes are being enlarged? Is the BB different? Is the fuel plate being shaved? Lastly, are different springs being used with the plunger?

Barring someone laying out the changes, if someone is willing to donate a grenaded larger injector or measure a 225 or larger and report back, please do.

Frank
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Last edited by twoicebergs; 06-10-2013 at 12:00 PM. Reason: sp
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post #2 of 23 Old 06-12-2013, 10:20 PM
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post #3 of 23 Old 06-13-2013, 06:59 AM
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You shim the body at the fuel plates.
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post #4 of 23 Old 06-13-2013, 08:27 AM Thread Starter
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Quote:
You shim the body at the fuel plates.
Thanks for responding.

So what you are saying is that nothing is different to the metering plates or holes in them to supply more fuel to the bore? I could see what you are saying working if the port wasn't plugged, but what would need changing, if anything, if the spill port was plugged?

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post #5 of 23 Old 06-13-2013, 08:03 PM
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I know that if the spill ports are plugged you can experience at rough idle. Why don't 205cc and up injectors come with the spill ports unplugged? Correct me if I'm wrong but when they are plugged it allows more fuel to be stored increasing the cc, right? Basically is it making it cheaper to get more cc out of an injector?

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post #6 of 23 Old 06-14-2013, 04:20 AM
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A 190-200 cc injector is about as big as you can go and still keep the spill ports un-plugged, because there just isn't anymore usable volume than that from the spill ports to the end of the body.

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post #7 of 23 Old 06-14-2013, 06:14 AM Thread Starter
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The issue to discuss isn't fuel plate spacers or spill port plugging to create larger usable chamber volume, except if it affects what has to be done to the injectors to ensure enough fuel is available at the top of the injection stroke. For anyone who missed it in any other threads, plugging the spill ports gives the equivalent of 20cc increase in injector sizing. Obviously the plunger return spring will aid in drawing fuel into the chamber, but at some point there may be other issues on ensuring enough fuel is available. Who knows, maybe nothing is required until you are completely rebuilding the cores for massive injectors or hybrids.

If someone wants to PM me with the info, your name will remain anonymous.

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post #8 of 23 Old 06-14-2013, 10:44 AM
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well i have 175cc injectors i built and mine loped a little at idle.but i think the
reason was air in the system plus i half a**ed it with the o-ring kit and cw's and
now i am paying for it.what is the most one could take off the int. piston and still be ok
or the shaft.i havn't done it yet but i think there is plenty of material there to get 225cc inj.

can some pm me and explain about the fuel plates.great post frank i know you will figure it out bud.
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post #9 of 23 Old 06-14-2013, 11:52 AM
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Frank I have 6 injectors waiting for you to figure this out haha

Build me anything 225-285cc

We could always buy a used 225-285 for measuring??


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trans, turbo, tire and injectors??
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post #10 of 23 Old 06-14-2013, 12:03 PM Thread Starter
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For 225s from 175s you would need to take off another 0.063" or add spacers to give the equivalent. For every .010" off, you get about 8cc equivalent. 275s would be another 0.063". The problem is still how to ensure you get the fuel in the chamber. Plus as you get larger you may be putting stress on the return spring.

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Last edited by twoicebergs; 06-14-2013 at 12:07 PM.
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