I have been told that a 6.2 DB2 IP has .290" plunger and a 6.5 DB2 4911 IP has .310" plungers. I've been informed that I can get a pump built with .350" plungers in it that will boost fuel output dramaticly. The only thing I wonder is just how much fuel will that put out? TDG states that a regular 4911 is capable of at least 80 mm^3 with .310" plungers so if that is the case would that mean that that a pump with .350" plungers is capable of 90 mm^3? That is just a rough mathematical thing I did in my head... if I could do it again I would.

Justin

You can get a Head & Rotor with .33" plungers, not .35". The fuel increase is dramatic, I've never actually even laid eyes on one, but trust me, it will put up more fuel than you would ever want, mid to high 90s would be my guess.

That's odd, the pump guy I've been talking to said .350"... He does come highly recommended by quite a few on the page... Either way as long as it puts out lots of fuel I will be happy. Thanks for the info TDG.

The "Marine" 310 hp. 6.5L injection pump Part Number is DB2831-5722.
The pump uses a four plunger rotor with .310" diameter plungers. Full load is 3,600 rpm. The test plan shows 3,500 rpm 73.5 to 76.5 mm/3 maximum output. High Idle is 4,100 rpm.

An important note to these specs. The calibrating test stand nozzles pop at 3,000 psi whereas the standard automotive standard nozzle is 1,700 psi. So when comparing apples to apples the marine pump will put out slightly more when using the lower pressure nozzles.

Cost? New pump suggested lists at $1,695.43

Can you convert a DB2? Yes, but might cost as much as new.

Can it be turned up? 10% would probably be safe bet.
Note 10% = to 84.15 mm/3 with 3,000 psi nozzles

Where can I get it? Local authorized Stanadyne fuel injection shop.

Can I convert my Electronic Pump? No, only mechanical.

Will it work on my truck? Being a Marine application you have to becareful not to float the valves.

Bigger turbo, 18 to 1 pistons, intercooler, fat wallet required for best results. Some black smoke may interfere with rear visibility under some circumstances. Use caution when climbing stiff currents. Exhaust temperatures may reach new highs for a brief period of time before piston reliefs kick in. Stainless piston return springs mandatory in marine applications, however, high temper HSS springs can be substituted in non-corrosive environments.

Next segment; How to install a John Deere four plunger rotor in your stock DB2 head.
__________________
CAUTION!
Some replys may appear closer to fact than they really are.

The "Marine" 310 hp. 6.5L injection pump Part Number is DB2831-5722.
The pump uses a four plunger rotor with .310" diameter plungers. Full load is 3,600 rpm. The test plan shows 3,500 rpm 73.5 to 76.5 mm/3 maximum output. High Idle is 4,100 rpm.

An important note to these specs. The calibrating test stand nozzles pop at 3,000 psi whereas the standard automotive standard nozzle is 1,700 psi. So when comparing apples to apples the marine pump will put out slightly more when using the lower pressure nozzles.

Cost? New pump suggested lists at $1,695.43

Can you convert a DB2? Yes, but might cost as much as new.

Can it be turned up? 10% would probably be safe bet.
Note 10% = to 84.15 mm/3 with 3,000 psi nozzles

Where can I get it? Local authorized Stanadyne fuel injection shop.

Can I convert my Electronic Pump? No, only mechanical.

Will it work on my truck? Being a Marine application you have to becareful not to float the valves.

Bigger turbo, 18 to 1 pistons, intercooler, fat wallet required for best results. Some black smoke may interfere with rear visibility under some circumstances. Use caution when climbing stiff currents. Exhaust temperatures may reach new highs for a brief period of time before piston reliefs kick in. Stainless piston return springs mandatory in marine applications, however, high temper HSS springs can be substituted in non-corrosive environments.

Next segment; How to install a John Deere four plunger rotor in your stock DB2 head.
__________________
CAUTION!
Some replys may appear closer to fact than they really are.
Nice tease once again Diesel Pro... Anyone I give these supposed HO/Marine pump numbers to can't seem to locate them. It seems as if they were an experiment that didn't work out or something. No one can find a four plunger head for a DB2 setup for 8 cylinders and no one can find a match to the numbers of the whole pump, this one or Penisulars either. So that leaves 2 options pay out the rear for "proprietary" settings or try out some different things. I'm trying to get an idea for what the different things I can do will produce in the end. Also IIRC John Deere rotary pumps were Roosamaster/Stanadyne or Lucas CAV. JD inline pumps have been Bosch or Nippon Denso. If I am correct in my statement about JD rotary pums, wouldn't that make your first lesson and second lesson that same? I'm not tryin to bust your balls here, just want a little more info from someone who seems to know more than I.

Did you give the pump number to an authorized stanydyne fuel shop. I f you did they should be able to look it up. I checked it myself and the pump does exsist

Maybe the people I have been talking to just don't want to deal with what I have been wanting to do. I digress to DP if the pump does exist, it's just frustrating to talk to multiple people in the industry and get negative answers. I guess I'll call around some more.

The "Marine" 310 hp. 6.5L injection pump Part Number is DB2831-5722.
The pump uses a four plunger rotor with .310" diameter plungers....Is that a misprint DP?
I keep forgetting to do it, I'll bring SSI (Stanadyne Service Infortmation) 6.0 (latest edition) home and install it on here and we'll settle everyones questions.

I believe all the above info is quite correct.

Ill make it easy for you when you install youssi 6.0. Its the last one on the list. You suprise me , I figured that someone who has over 1800 posts and builds as many ip as you say you do would've known that there was a 4 plunger db2.

I see now why I couldn't find it before.
SSI erroneously lists it as a DB2 pump, I was searching for DB48* to find any and all 4 plunger 8cyl and none showed up. The 5722 has 4 plunger written off to the side.
My bad, I'm terribly sorry, I searched and though I was right, and I was wrong, so to you TD especially, and the guys here on the site, I was misled, and I"m sorry.

Ill make it easy for you when you install youssi 6.0. Its the last one on the list. You suprise me , I figured that someone who has over 1800 posts and builds as many ip as you say you do would've known that there was a 4 plunger db2.Guess that just shows that things change even with our "old" engine and there is always a chance that something new comes along that hasn't gotten out to every one. Also sounds like not "everyone" else knows about this pump either, SEE dieseldummy post about noone else knowing about it either.


AND it appears to be a error in the program too.

I'm glad we have lots of different people here that have different sources to help us all. :)

Sorry. there is no error in the listing. This is a DB2. It is listed correctly.
The model "DB2" does not signify that the pump is two plunger, however, most people erroneously think that. A DB2 pump can be two or four plunger.

So what does DB2 signify if it doesn't indicate the number of plungers in the pump? Same with DB4 and DS4??? Why is all of this hush hush info? Finding out about this stuff is like pulling teeth from an alligator...

The letter DB, DB2, DB4, DS are just model numbers, or different types. Don't mean a whole lot. Could just have well been called model A, B, C, D or A1, A2, B2 , or C3P0. Info is not hush, hush, just need to know someone who knows how to get it. Trust me, there ain't a whole lot of fuel injection gurus on the internet sharing this info like TDG or myself. Takes up to much time.

Thank god that you have a little time to give. I wouldn't have a clue without you guys.

DB4 pumps are all off-highway applications, tractors, gen sets you name it, so I can see how the might be an emissions or legal reason to call it a DB2. I don't understand why they would have to do it for a Marine application, but my guess is that its the same reasons.

Technically, DB2831 should denote the style of the pump (DB), number of plungers(2), number of cylinders(8), and size of plungers(31).
Since they are calling it a DB2, I wouldn't be surprised if the plungers are really 27s. Which would technically be a DB4827. Judging by the calibration tables, I'll bet thats what it is.

DB4 pumps are all off-highway applications, tractors, gen sets you name it, so I can see how the might be an emissions or legal reason to call it a DB2. I don't understand why they would have to do it for a Marine application, but my guess is that its the same reasons.

Technically, DB2831 should denote the style of the pump (DB), number of plungers(2), number of cylinders(8), and size of plungers(31).
Since they are calling it a DB2, I wouldn't be surprised if the plungers are really 27s. Which would technically be a DB4827. Judging by the calibration tables, I'll bet thats what it is.
So what do you think this would do to hp & tq? How about normal highway mpg? Sounds promising

If you just bolted it onto a stock 6.5 engine, you would destroy it.
Dropped compression is a must, marine injectors too because this pump is calibrated against 3000psi opening pressure where highway pumps are calibrated with 1700psi.

DB4 pumps are all off-highway applications, tractors, gen sets you name it, so I can see how the might be an emissions or legal reason to call it a DB2. I don't understand why they would have to do it for a Marine application, but my guess is that its the same reasons.


Technically, DB2831 should denote the style of the pump (DB), number of plungers(2), number of cylinders(8), and size of plungers(31).
Since they are calling it a DB2, I wouldn't be surprised if the plungers are really 27s. Which would technically be a DB4827. Judging by the calibration tables, I'll bet thats what it is.
Thanks for the straight answer Tex. I knew I have had it explained to me like that more than once... So the pump I'm looking at having made would be a DB2835? 2 plungers .035" in size for an 8 cylinder application.

Yes, but again, I don't think that one exists, but I could be wrong, I've only seen DB2833 and IIRC ~250Hp.

Technically, DB2831 should denote the style of the pump (DB), number of plungers(2), number of cylinders(8), and size of plungers(31).
Since they are calling it a DB2, I wouldn't be surprised if the plungers are really 27s. Which would technically be a DB4827. Judging by the calibration tables, I'll bet thats what it is.
Got a few errors here

(1) The model pump is DB2 not DB, doesn't even look like a DB pump.
(2) The number "2" is part of the model number & does not signify plungers.
(3) No it is not a model DB4, it's a DB2
(4) 31 signifies .310" diameter plungers. 4 to be exact.

I'd be more careful in placing bets on this one.

All things being fair DP, unless you can come up with another DB2 with 4 plungers, or a DB4 with 2 plungers, the number is 'supposed' to designate the number of plungers just like it does on every other pump out there. This pump was designated as a unique exception for emissions or legal reasons.
'D' is actually the series, 'B' is the style, and if they fudged over the # of plungers, why couldn't they fudge over their size?
A 4 plunger .31 head, you know as well as I do, would be reserved for a MUCH larger application than a 6.5, even high HP marine. Many 4 plunger .27 pumps put out more fuel than what the 5722 specs.

Do you always have to make everything a debate? So I've never heard of a 4 plunger DB2? Its not like there's more than a handful in existence.

I am pulling my information direct from Stanadyne. Listed correctly in their specs. and their parts listing. Where is your info listed? I would scan it and post it, but that would be against copyright and Stanadyne contract guidelines. I have listed the Part number which is extremely rare to find on the Internet. I would say this might be the only place it has ever been listed. Anyone who wants one of these pumps can contact their local Stanadyne authorized dealer and order one. Part number 05722 or DB2831-5722. No one is going to stock it, but it can be ordered.
I have nothing to debate. Just trying to list the correct info.

I have the access to the same copy of SSI6 that you do. Its listed the same way on mine as it is on yours, but rather than you admitting that this is a LONE exception, you have to try and make your point that 'you knew all along'...

TDG and DP:

You BOTH bring tons of knowledge to the table that we ALL appreciate! It's stuff that we couldn't get many other ways.

I for one thank both of you for the knowledge I have gained from both of you.

Can ya please quit kicking each other in the balls? Deeeeep Breaths!

[QUOTE=Texas Diesel Guy]
A 4 plunger .31 head, you know as well as I do, would be reserved for a MUCH larger application than a 6.5, even high HP marine. QUOTE]

The electronic DS has a 4 plunger .310 head.

TDG and DP:

You BOTH bring tons of knowledge to the table that we ALL appreciate! It's stuff that we couldn't get many other ways.

I for one thank both of you for the knowledge I have gained from both of you.

Can ya please quit kicking each other in the balls? Deeeeep Breaths!
No it doesn't appear that it will happen BUT it should, Some kicking always has to happen around here, like others I've heard about. You say tomatto I say tomotto or something like that.

"That answer couldn't be closer to the real turth!"

The electronic DS has a 4 plunger .310 head.Sorry, I thougth it was obvious I was referring to DB pumps... Since thats what this ENTIRE THREAD has been about.

Has anyone ever actually laid hands on this 4 plunger marine pump? Couldn't there be a possibility that it was just an experimental thing that never made it? I guess since no one has really came up with any big problems with .035" plungers for my DB2-4911 that is still the cheapest and probably no more of a gamble than other things.

TDG and DP:

You BOTH bring tons of knowledge to the table that we ALL appreciate! It's stuff that we couldn't get many other ways.

I for one thank both of you for the knowledge I have gained from both of you.

Can ya please quit kicking each other in the balls? Deeeeep Breaths!


I think they are Ro-sham-bo'ing over it!! :D lol

All things being fair DP, unless you can come up with another DB2 with 4 plungers, or a DB4 with 2 plungers, the number is 'supposed' to designate the number of plungers just like it does on every other pump out there. .

Just did a quick check. There are 169 DBO pumps listed in specs. such as DBO331-2737, DBO331-2741, DBO331-2738. According to your designation I guess all of these have "O" amount of plungers?

The 5722 pump uses the stock drive shaft. A DB4 head uses a larger drive tang so it can't physically fit the drive, so it's not a DB4 head in there.

The 5722 is a DB2 pump. In this case it uses a 4 plunger head which is unique.

DBO, DCO, DBG etc, yes I know and I understand the distinction, the DB2 pumps use a removeable weight cage, DB4s have the lower part made with the rotor, etc.

Can we drop this already?