Help me NOT screw it up . . . .

[BC847]

My OEM injection pump is presenting with signs and symptoms of general age . . .. and so is that on the truck.
It's developed a minor intermittent leak from somewhere, the throttle-shaft is heavily worn, the throttle-lever spring-loaded thingy is worn heavily and I'm within 0.05 (+/- 0.02sec) seconds of being able to average right at 7.99 or better in the eighth mile.

I've got a New (old stock) 12mm VE injection pump.



Oh my!

I've got a 3800rpm gov spring, a custom AFC cone thingy, two full and two incomplete gasket/seal kits in addition to an electronic copy of the Bosch: Diesel distributor fuel-injection pumps, Technical Instruction manual.

I'm gonna tweak the new IP before I install it and am looking for suggestions on how to make it a surprising upgrade.

I'm not expecting anybody to give up family secrets. I'm hoping folks might volunteer ideas . . . . . that don't work, and why.

I'm thinking of doing some porting/polishing, addressing the input shaft seal, a little of this, a little of that.

What'cha reckon?

[JQmile]

14mm head??

Just kiddin bud, I know you want to break 500 on a 12mm

[RCCUMMINS89]

subscribed

[oldestof11]

How indepth do you want to go?

[BC847]

How indepth do you want to go?

Dunno, Jon.

I'll be honest and say I don't want to threaten the reliability of the 12mm VE. That being said, I'm thinking, where appropriate, rounding all the sharp edges of the fuel track within the IP. Dink with the case pressure regulator. Ensure the dynamic timing assembly makes a full stroke in a usable range.

The fly in the ointment is that I don't have access to any means of verifying any improvements other than regular driving and the track.

I do however have a couple of used IPs for the purpose of practice meaning I don't mind cutting access holes in the case to aid in visualizing parts movement (fuel/governor linkage movement).


I do know that there have been many folks attempt the same type of stuff using a lot more sophisticated machining with little or no improvement so, . . .. I'm not going to kid myself . . . . . .

[oldestof11]

Here is a couple things I have done to my extra pump. viewtopic.php?f=4&t=12738

Something to consider is the vane pump. That is 1 thing that needs addressing.

Also something I am going to mod is the cam plate. If you notice the nice wavy motion, I want to keep the peak (2.8mm of lift) but cut the ramp profile to more like a cam profile and less of a flat land on the top of this peak. The faster you can inject fuel over time, the more power you can make. So a faster ramp, longer fill time (because to cut a faster ramp, you move the up and down ramps closer, which move the 6 peaks further away) will invariably increase the amount of power. In a way, this is what Zach Hamilton is doing for his P-pump cams.

How this will affect the overall reliability, I DON'T KNOW. This is just what this idle mind has thought of.

[RCCUMMINS89]

Has anyone ever made any advancements in the vane pump department?

[BC847]

Has anyone ever made any advancements in the vane pump department?

Not that I'm aware of - specifically the vane-pump.

Things attached to it . . . perhaps.

[RCCUMMINS89]

Can anything be done to increase its effeciency? I've only looked at one once.... for about 5 minutes while I took it apart and put it back together.

Can different sized vanes be put in it, or modified?

[BC847]

Here is a couple things I have done to my extra pump. viewtopic.php?f=4&t=12738

Good info.

Some threads I've bookmarks in the past for one reason or another .. . .

IP Reassembly: http://www.vwdieselparts.com/forum/viewtopic.php?t=6694

VW Governor mod: http://forums.lr4x4.com/index.php?showtopic=51360&st=20

http://forums.tdiclub.com/showthread.php?p=437307

[oldestof11]

Good ones!

Something I was just thinking about on the vane pump. Looking at a vane pump that is the lift pump for the VP44, it has 3 large vanes. The size of the rotor is small compared to the vane size. Meaning, the vanes are longer than the actual depth available in the rotor for them to "collapse". The solution was to cut into the rotor at an angle to allow longer vanes while still being able to collapse when it gets to the narrower part of the assembly.

If we cut the rotor down, then cut the slots for the vanes at an angle, this may overcome our vane pump limitations.

Then again, the lift pump is for high flow, low pressure applications.

[BC847]

I wonder do we need it with just the 12mm H/R. Dunno.

That pressure regulator thingy has been messed with by others who don't talk much about it. While it regulates the case pressure, as such, it also influences the dynamic timing. On paper, one can possibly shim that spring and raise the case pressure across the board.

[ahale2772]

I would try and make a retainer while you are there, IMO, runnin 50psi thru the inlet may be just as advantageous as hours of vane pump work

[RCCUMMINS89]

Won't that also take away from the dynamic timing? And in a drag race the dynamic timing is a huge advantage for the small fuel delivering ve pump.

[Farmboy92_2009]

so i read the thread and im mind whAt? now.....