CDD DB4 Pump Build

[IDIBRONCO]

How I HAVE to buy those lottery tickets! Anybody know what the Powerball is up to?

If you guys thought this was funny, can you imagine me going to pick my $250 million winnings and telling them to make the check out to Wesley Morris instead of me?

 

[jwsfarrier]

Great info Wes. Thanks!

 

[cliffpoint]

Great thread, and learned a lot about DB pumps. The final numbers on this KILLER DB4 pump is loading down his 10HP test stand and may need to go bigger. I wonder how this pump will affect pump drive gear set over time.

 

[Wise Mule]

I know that this is an older discussion. I have been in the marine industry for many years and have experience with the marine version of the 6.5. Overall the marinized version does well for size/weight/horsepower. The main problem has been cracks in the heads due to heat. Also, the marine industry follows a basic recreational use of 100 hours a year, 500hrs for five years. Marine Diesel engines are based on recreational, medium duty and commercial use. So you will find that commercial or continuous duty engines will have a much lower power rating for longevity. Marine engines generally have unlimited cooling from raw water intake. Water generally transfers heat 20 times better than air. You can turn up the fuel, boost pressure, cam, timing, but this creates heat. The basic Penisular marine engine is 300-320hp. Raw water heat exchanger, raw water intercooler, etc…. I really appreciate what y’all do in the tireless pursuit of research.

 

[Goose_ss4]

Been daily ing this pump now for over a year. On and off for a year before that. It's still going. It ain't perfect, but what is. I'll be upgrading soon for high roller models soon

 

[The_Josh_Bear]

Been daily ing this pump now for over a year. On and off for a year before that. It's still going. It ain't perfect, but what is. I'll be upgrading soon for high roller models soon

What's this high roller model?

 

[david85]

Any new updates on this topic?

 

[Diesilee]

X2

 

[Clb]

Kinda looks like his last vist was 3 years ago...

 

[david85]

I suppose the main takeaway from the experiment was that even if the db2/4 hybrid can be modified for very high flows, the amount of horsepower needed to drive it goes up significantly (perhaps exponentially). So an inline p-pump is still the better solution from the standpoint of reliability and efficiency. Any thoughts of the db2/4 being cheaper can probably be put aside, unless someone figures out the problems uncovered here.

The thought of roughly 10hp being needed to drive the pump raises many questions about whether the timing set in the engine could reliably support that. Then again I don’t know how this compares to a stock db2 pump, but Wes’s comments suggest it’s significantly less than what the experimental pump required.

 

[IDIoit]

I suppose the main takeaway from the experiment was that even if the db2/4 hybrid can be modified for very high flows, the amount of horsepower needed to drive it goes up significantly (perhaps exponentially). So an inline p-pump is still the better solution from the standpoint of reliability and efficiency. Any thoughts of the db2/4 being cheaper can probably be put aside, unless someone figures out the problems uncovered here.

The thought of roughly 10hp being needed to drive the pump raises many questions about whether the timing set in the engine could reliably support that. Then again I don’t know how this compares to a stock db2 pump, but Wes’s comments suggest it’s significantly less than what the experimental pump required.

a p pump design may be an improvement for fueling but the fabrication involved, the availability of custom parts, negates this for the average IDI builder.
not only would you need a custom adjustable timing gear, you would also need a custom gear cover, custom valley pan, and custom intake. not to mention injection lines, which when i priced custom lines, the tune was $600

unfortunately, covid killed my p pump IDI build.


my R&D DB4-150 cost me the same as it cost me to rebuild my P7100 for my DT.
the only time ive seen a inline pump installed on a IDI was the infamous bumpside and the jag. so not alot of input of how well it actually did.

 

[Nero]

Looks like a fuel pump with an engine attached to it

 

[Clb]

@snicklas
Feel free to axe this if its to spicy.


Beating a combine to harvest 2x it's rated duty cycle

Selling the Brooklyn bridge

Making you younger and richer

Sounds familiar...

Way back like 10 years ago we had some clown come in stating that he would make a daily driver with 400 whp....
He left tail tucked.
Yes 400 has been done, no it's not viable.


All things done by these shop owners that "drive by" the forum to make some sales

Mel put in the work over the years and across the net.
Russ was a good man ( R.I.P.)
SO lets see who pops in next.
Who remembers the rally dyno days?!

 

[david85]

a p pump design may be an improvement for fueling but the fabrication involved, the availability of custom parts, negates this for the average IDI builder.
not only would you need a custom adjustable timing gear, you would also need a custom gear cover, custom valley pan, and custom intake. not to mention injection lines, which when i priced custom lines, the tune was $600

unfortunately, covid killed my p pump IDI build.


my R&D DB4-150 cost me the same as it cost me to rebuild my P7100 for my DT.
the only time ive seen a inline pump installed on a IDI was the infamous bumpside and the jag. so not alot of input of how well it actually did.

Looks like I’m a little out of date. I didn’t realize these hybrid pumps were already out there racking up daily miles. Do you have a thread on your pump and how it’s worked for you?

Driveability? Cold starting? Any change in mpg for normal driving?

I chatted to a local builder that started with db2 pumps back in the late 80s and he said he could probably build a db4 pump for me. That’s when I did a search here and found this thread to get a better idea of what’s involved. Devil is always in the details.

 

[IDIoit]

Looks like I’m a little out of date. I didn’t realize these hybrid pumps were already out there racking up daily miles. Do you have a thread on your pump and how it’s worked for you?

Driveability? Cold starting? Any change in mpg for normal driving?

I chatted to a local builder that started with db2 pumps back in the late 80s and he said he could probably build a db4 pump for me. That’s when I did a search here and found this thread to get a better idea of what’s involved. Devil is always in the details.

"unfortunately, covid killed my p pump IDI build."
i bought a DB4-150 instead