Formula for finding injector CC's - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 13 (permalink) Old 03-28-2009, 01:16 AM Thread Starter
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Formula for finding injector CC's

Alright its been awhile so im a little rusty and having a brain cramp. Isnt the formula for finding the volume of the fuel in an injector (plunger surface area x intensifier piston stroke) ??? I did this on a set of injectors i have and came up with some numbers that arent what i thought they were.

For example a stock BD530 injectors plunger surface area= .873in
and the intensifier piston stroke= .250in

.873x.250= .218cc's ???

Now am i missing a step or is this the number? I thought that the stock BD's were around 240-250ish???

Robert


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post #2 of 13 (permalink) Old 03-28-2009, 02:15 AM
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Re: Formula for finding injector CC's

I'm not sure if that is right, but you have to multiply the end by 1000 since they are classified by how much volume they expend in 1000 shots. Think you are using the right formula in bore X stroke, but I'm not savvy in the injector field.

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post #3 of 13 (permalink) Old 03-28-2009, 03:00 AM
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Re: Formula for finding injector CC's

First of all you shouldn't be using Inches... Its Millimeters...

Surface area of a 530 plunger is 39.59mm

If the travel is 6.35mm (.250 inches)

Then the "Maximum Estimated" cc flow rate would be 251.4cc's per 1000 injection cycles
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post #4 of 13 (permalink) Old 03-28-2009, 03:09 AM Thread Starter
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Re: Formula for finding injector CC's

Quote:
Originally Posted by UNLIMITED_DIESEL View Post
First of all you shouldn't be using Inches... Its Millimeters...

Surface area of a 530 plunger is 39.59mm

If the travel is 6.35mm (.250 inches)

Then the "Maximum Estimated" cc flow rate would be 251.4cc's per 1000 injection cycles

Ahh! me doesnt think in mm to often thanks.

Robert


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post #5 of 13 (permalink) Old 03-28-2009, 03:10 AM
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Re: Formula for finding injector CC's

does that help with your calculations???
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post #6 of 13 (permalink) Old 03-28-2009, 03:16 AM Thread Starter
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Re: Formula for finding injector CC's

One more, what is the surface area of an A code plunger?

Robert


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post #7 of 13 (permalink) Old 03-28-2009, 03:17 AM
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Re: Formula for finding injector CC's

28.27mm
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post #8 of 13 (permalink) Old 03-28-2009, 03:28 AM Thread Starter
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Re: Formula for finding injector CC's

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Originally Posted by UNLIMITED_DIESEL View Post
28.27mm

okay. Looks like im going to be going over this with my college math professor tomorrow,

My caliper came up with a diameter of .278 of the plunger (B codes)
multiply that by 3.14 for the area .873in converted to millimeters and the outcome is 22.174mm not 39.59

maybe this is getting anoying but i feel like im getting kicked in the nuts over this, Ha Ha.


Robert


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post #9 of 13 (permalink) Old 03-28-2009, 03:36 AM
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Re: Formula for finding injector CC's

Forget inches. Use your calipers and find the millimeters...

530 Plunger is 7.1mm in diameter, divide that by 2 and come up with the radius. 3.55mm... Multiply 3.55mm x 3.55mm and come up with 12.6025mm... Multiply 12.6025mm x 3.14 and come up with 39.57mm. Close enough

Do the same for A code plunger... 6.0mm divided by 2 equals 3.0mm... 3.0mm x 3.0mm equals 9mm. 9mm x 3.14 equals 28.26... Again, close enough
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post #10 of 13 (permalink) Old 03-28-2009, 03:43 AM Thread Starter
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Re: Formula for finding injector CC's

Quote:
Originally Posted by UNLIMITED_DIESEL View Post
Forget inches. Use your calipers and find the millimeters...

530 Plunger is 7.1mm in diameter, divide that by 2 and come up with the radius. 3.55mm... Multiply 3.55mm x 3.55mm and come up with 12.6025mm... Multiply 12.6025mm x 3.14 and come up with 39.57mm. Close enough

Do the same for A code plunger... 6.0mm divided by 2 equals 3.0mm... 3.0mm x 3.0mm equals 9mm. 9mm x 3.14 equals 28.26... Again, close enough

Alright the student now understands the teachers lesson, thanks man!

Robert


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