Twins with Twins, Anyone?

Bdsankey

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Feb 1, 2018
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Industrial Injection has their XP line of CP3 pumps that are both bored and stroked. From what I understand, they have 2 levels. Stock plungers are 7.5 mm, the standard XP pump bumps that up to 8.5 mm, but I hear they also have one that is 9.5 mm. They are all a 12 mm stroker pump, but I'm sure they could do something custom for you if you called them. I installed one of their 8.5 mm pumps in a customer's truck after talking to a few people who have run them, and it is working good so far, but I have very little run time on it and can't speak to the reliability or longevity.
IIRC the old pump was 8.5mm plunger, the new pump is 9mm plunger but it wouldn't be the first time I was wrong lol. I had the same thought as you, maybe Ken could get a standard stroke or 10mm stroke with the large plunger and still achieve his goals while lessening some of the loads the eccentric shaft would see as the ramp angle would be far lower.

Rough math puts the following pumps/dimensions at X flow per plunger per stroke (note, purely volume calculation not a direct fuel output value):

-Stock CP3 (7.5mm bore x 8.2mm stroke): 362.26mm3
-10mm stroker (stock bore): 441.79mm3
-12mm stroker (stock bore): 530.14mm3
-14mm stroker (stock bore): 618.50mm3
-Old II XP (8.5mm bore x 12mm stroke): 680.94mm3
-New II XP (9.0mm bore x 12mm stroke): 763.41mm3
-Custom 9mm bored x stock stroke: 521.66mm3
-Custom 9mm bored x 10mm stroke: 636.17mm3

Based on those quick calcs, a stock stroke custom bored pump would come damn near his current fuel volume.
 

kidturbo

Piston Tester
Jul 20, 2010
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Note to Future Self. Cut siezed fuel line off of injector rather than mount injector in vice and use cheater bar on wrench,, $400 lesson.

Decided to send all the injectors out to be cleaned and flowed while down on the pump and drive situation..


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juddski88

Freedom Diesel
Jul 1, 2008
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Chesterfield, Mass.
Note to Future Self. Cut siezed fuel line off of injector rather than mount injector in vice and use cheater bar on wrench,, $400 lesson.

Decided to send all the injectors out to be cleaned and flowed while down on the pump and drive situation..


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Child's play! Just wait till you have a couple refuse to exit the bore!
 

kidturbo

Piston Tester
Jul 20, 2010
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Child's play! Just wait till you have a couple refuse to exit the bore!
I've read some of those horror stories. However the tip usually doesn't break off before they finally come loose.. Bosch somehow crimps those line fittings once screwed into the injector body, with no intention of them ever being removed.

I was being a smart ass when my young helper said "Can't get this last injector out because this line won't break lose." I'd just previously removed all the sticks from the other engine, so zipped that retainer loose and popped it right out for him... Ta-Da.. The next morning was a real downer. I even heated it first, and it still bit me. Was only thinking how hard it's gonna be to get another fuel line chromed this week.. 🤔

I did order 2 sets of billet injector hold downs to go back on with. Out of 16 sticks, had one copper with a little soot line on the bottom where a speck of dirt must have hung it up for moment. Horror stories about leaking flames past the coppers do actually scare me. These factory retainers and bolts have only been torqued a dozen times or so now... :D
 
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juddski88

Freedom Diesel
Jul 1, 2008
4,387
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Chesterfield, Mass.
I have a full set of chromed LBZ lines actually, if you need them. I had them done about 8 years ago by the guy to who does a lot of work for Jay Lenno here in Holyoke, MA when I thought I was going to keep chasing horsepower and big events.
 

S Phinney

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Aug 15, 2008
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I spent last 3 days speaking with ever BOSCH specialist I know of. Consensus is the oversize plunger raises the load on the cam followers exponentially. While this may not be a problem on trucks, the high sustained RPM goes into the realm of unknown on the strokers. Lubrication or heat, or a combination is obviously the cause, but I've yet to gather any data.

Randy from Exergy is bringing me a 12mil pump Monday, and we will give it another swing, with some lube added. Also going to put the IR camera to work and log some temps on feeds, rails and returns at speed. That and regulator duty cycle is what they all wanta know. Hopefully we can all learn something from this.

The other consensus from the pros, go back to a dual stock CP3 setup and call it done. Since these already run an electric water pump, just move the fuse block and hour meter, bolt one up in minutes..


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I was talking with Ryan yesterday. I always upgrade my returns as well to cut down on heat. What are you running for return line size? Where did you get the mango to AN fittings?


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kidturbo

Piston Tester
Jul 20, 2010
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I was talking with Ryan yesterday. I always upgrade my returns as well to cut down on heat. What are you running for return line size? Where did you get the mango to AN fittings?


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I hope Ryan got some rest, kids been running circles around me on seat millage over past month. Let him sleep today, he's got a Fluidamper to pull for me.. 😂

The return "line" is a 3/8" SS that I welded some barb fittings into. Larger return outa the pump, 4mm off the injectors, dumping directly into fuel cooler [pic 2]. Outa the cooler, uphill to slightly above crankshaft level, back into the tank. The cooler is directly off the seawater pump, but very simple design. Just a SS tube thru a tube, so might need to go copper, not sure yet.

I looked as some IR photos couple days back that showed the front of engine, no significant heat signatures noticed. But soon as we are running again, will be all over those lines shooting temps at speed. One problem I found with IR cameras, they read Black within a deg or so, but chrome or stainless, it will read your reflection closer. So will be putting some black tape on the injector feeds to get a good read.

AN Banjo fitting came from Jegs. Part # is listed somewhere many pages back, so do a quick thread search. Dang best part of the whole fuel system IMO.. LOL



IMG_8113.jpg

Fuel-Return-Line.jpg
 
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