How far can you stroke an A code with out machining the plunger? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 19 (permalink) Old 01-17-2007, 07:17 AM Thread Starter
 
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How far can you stroke an A code with out machining the plunger?

As the title says.

How much can you machine the intensifier piston to mathematically flow before you are required to clearance the plunger?

180cc ? 200cc ?

My friend wants to build 200's and I want to know if we will have to do anything besides machine the IP.

Thanks

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post #2 of 19 (permalink) Old 01-17-2007, 04:38 PM
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You can machine the back side of the piston all you want and the plunger will never bottom out. If you machine the open end of the plunger the spring will coil bind before the plunger bottoms out assuming you are refering to AAs. On an AD or AE injector you can take about .030" off the open end and still have a couple thousandths clearance on an AB you can take off about .040" and have about .001" clearance and on an AA you can take off about .140" off and have about .002" clearance. The AA, AD, and AE will bottom out the spring before it will bottom out the plunger. You don't want that spring to be coil binding constantly or it could break. You can take .017" off an AE, .009" off an AD, and .087" of an AA and that will leave you with .002" clearance for coil bind. These are all figures actually mesured so there may be a couple thousandths difference between one injector to the next. I'd probably recomend giving at least about .005" clearance for all those figures so that you don't run the risk of bottoming the plunger or binding the spring. Take as much as you are comfortable with off the closed end of the piston and you'll be good. I've never tried to test how thin you can make the back side of the piston before it will break so like I said just go as far as you dare. The AD pistons are VERY thick on the bottom but you will screw with the primary shot of the split shots by doing that. The ABs are much thinner but do still have some decent meat on them to take away but again will mess with the split shot end of it. The AAs are slightly thicker than the ABs.

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post #3 of 19 (permalink) Old 01-17-2007, 05:05 PM Thread Starter
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Thanks Geoff!

Now for the next question.
What measurement = 1 cc? How much machined of the IP per CC of fuel gained? and is it a fixed amount or is it different for AA,AB,AC,AD,AE etc?

For example you machine off .100 to obtain 160cc's out of AA's.
That's 70cc's of fuel in theory. That means .010 will give you 7 ccs and .001 will give you .7 cc's
When you actually divide you get some long crazy number that's impossible to work with like this. .00142857repeating

I guess the easiest way to get to 200ccs is just go .015 and have 195cc's?

Is there enough on the closed side of an AA plunger to do this?

Thanks
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post #4 of 19 (permalink) Old 01-18-2007, 05:55 PM Thread Starter
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??????
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post #5 of 19 (permalink) Old 01-19-2007, 02:01 AM
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It seems as I recall .016" gave it about 10cc of fuel. I'd have to consult my notes to verify that. Usually if you take about .100" off the piston on an AA that'd give you right about a 160cc injector up from 90cc.

'96 F-250 Extended Cab, GT'S injectors, GT'S intercooler install kit, custom turbo kit with a little HX40, Swamp's BIGEST oil.
466 on #2 only
739 with NČO

13.544 in 1/4 mi!

"If you think you can do a thing or think you can't do a thing, you're right." Henry Ford

Yeah I can keep up!:Thumbup:
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post #6 of 19 (permalink) Old 01-19-2007, 04:01 AM Thread Starter
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What if I want 195's? I can machine 0.15 ???
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post #7 of 19 (permalink) Old 01-19-2007, 07:40 AM
 
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post #8 of 19 (permalink) Old 01-19-2007, 07:47 AM Thread Starter
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Awwww come on Cass....

No need to be bashful. Let me have it. :
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post #9 of 19 (permalink) Old 01-19-2007, 08:00 AM
 
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Don't worry about me, I ain't bashful. Just sittin back and taking in the scenery.:
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post #10 of 19 (permalink) Old 01-19-2007, 11:21 AM
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