Building a better db2

[Thewespaul]

A little over my head. What is the target application of this type of pump? Are we talking tractor pulls, or daily driver? What type of mods would one need to support these higher fuel rates?

I daily drive the first one built, they drive really nice and with so much fuel you can do most your driving around town with less than a quarter throttle and keep up with traffic with ease. Im running one with just a stock factory turbo setup with an intercooler and its really not bad. The turbo hates all the drive pressure, but it starts building boost right off idle with all the fueling, and theres just a light haze of smoke above 2200 rpms. Id reccommend pairing it with a 60-1/T350 turbo at the least to make the most of it, but with my drop in T04Z turbo it makes 30+ psi of boost easily, well over 300hp its a real fun ride with just a bolt in turbo and pump. This pump uses a lot of volume, so an upgraded electric pump is required along with a bypass regulator. I will have a drop in kit soon for those who want a simple bolt on solution.

Heres the turbo parts I offer:https://classicdieseldesigns.com/collections/turbos-and-turbo-parts

And here is the big 2 plunger: https://classicdieseldesigns.com/co...ducts/custom-built-db2-injection-pump-rebuild

 

[laserjock]

Just an update, gotten a few of these sold and gotten some very good responses overall. They perform fantastic for the amount of money for those who don’t want to drop the coin on a db4. Not bad for a stock bore 2 plunger pump:

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Working on a couple big brothers to the 150, hoping to see 200cc with the plunger upgrade on one we are starting on now, I’m going to continue it in this thread for continuity. More to come.

What pump is that Wes?

 

[Thewespaul]

What pump is that Wes?

This is the one listed on the website as the 130cc pump, it does over 150cc at peak fueling, but I list them on the website according to what they make at hp peak, since that’s what really is the critical number.
https://classicdieseldesigns.com/co...ducts/custom-built-db2-injection-pump-rebuild

 

[PROFG]

Found this looking for db2 internal operation and your mention of transfer pump spikes generates this question. Can transfer pump pressure be measured external to a stock db2. Can case be drilled/taped to access this pressure. If so, why would not a small accumulator absorb spikes and prevent "grenade"? IMNTK

http://www.trucktrend.com/how-to/expert-advice/0809dp-stanadyne-db2-injection-pump

 

[Thewespaul]

A year ago no, but I have developed the instrumentation to be able to read it in real time, which has allowed me to build my pumps around it and alleviate the pressure spikes. When I develop my pumps I set them for full fueling (120+ psi tp) on the stand then install them on my shop truck and watch tp in real life driving, and adjust accordingly. I’ve found that the spikes we see on the stand don’t happen on the trucks, and with all the heat my pressures drop significantly, so there’s a lot of room for improvement by building a pump to perform well on the truck, not just on the stand.

 

[Macrobb]

Hm, does that mean it might be worth modifying the test stand to include a heater for the working fluid(to keep it near truck levels), along with perhaps a heat blanket or some other heater to warm the pump up to operating temperatures as well?

 

[Thewespaul]

We already do that, and with these pumps working so hard making 300% more fuel than they were designed for they create a ton of heat on their own, it’s also possible that on the engine the pump is putting out more fuel with the injectors versus the calibration nozzles on the stand, which would explain why transfer pressure drops in the trucks, less restriction to flow.

 

[PROFG]

I guess I should have worded it how I thought it. Can I measure transfer pressure on stock db2 without drilling the case? It would seem that IP delivery valves would isolate TP from any differences between test stand and truck but obviously not. A small accumulator in pressure test line would seem to smooth out TP pressure on test stand and more closely emulate real install (too large slows response to rpm change tho). Did you see spikes only with internal TP or also when supplying pressure from external source?

 

[ifrythings]

I guess I should have worded it how I thought it. Can I measure transfer pressure on stock db2 without drilling the case? It would seem that IP delivery valves would isolate TP from any differences between test stand and truck but obviously not. A small accumulator in pressure test line would seem to smooth out TP pressure on test stand and more closely emulate real install (too large slows response to rpm change tho). Did you see spikes only with internal TP or also when supplying pressure from external source?

No drilling the case required, there is a test port for measuring transfer pump pressure.

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[PROFG]

Thanks ifrythings, was hoping that was the case, have a somewhat outside the box use for that port.

 

[Josh Oldenburg]

Why would one want to watch and monitor transfer pressure?

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[IDIBRONCO]

It might be a cool gauge to have in the cab.

 

[Macrobb]

Why would one want to watch and monitor transfer pressure?

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Would be useful for on-the-truck measuring, and reconditioning of old IPs when you don't have a test stand - transfer pressure affects timing advance, so you can see the health of the timing advance/transfer pump that way I'd think.

 

[PROFG]

Actually I planned to input that port. Later.

 

[FordGuy100]

Warmer fuel/hot IP should reduce IP output I would imagine. I wonder if a fuel cooler pre-injection pump would be a good idea?