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-   -   VP44 - P7100 conversion (https://www.dieselbombers.com/dodge-diesel-tech-articles/22831-vp44-p7100-conversion.html)

haulitrite 02-24-2009 11:38 AM

VP44 - P7100 conversion
 
I was trying to find a link with a explanation but cant find one.

Does anyone know what it takes to convert

Whit 02-24-2009 12:07 PM

Yes you can put a P7100 on a truck that once had a VP44. The main reason its done is to take advantage of the mechanical controls and the only ones who usually go about doing it are big time pullers who need a Cummins to spin upwards of 6000 rpm. The P7100 is the only one that can do it.

First off the injectors between the 12V and 24V are different and have different pop off pressures. The VP44 is actually able to deliver higher injection pressures so you would need to find a manufacturer to make a 24V injector pop off at low P7100 pressures.

The pump drive different and the timing case is different.

The P7100 requires the mechanical lift pump that comes with the 12V trucks. This is driven from a lobe on the 12V trucks camshaft. Your 24V cam doesn't have the fuel pump lobe.

So you need a new cam, new timing cover, custom 24V injectors designed to operate at the low P7100 injection pressure and lots of cash!

The P7100 is a great injection pump and is very versatile. Its durable because it is lubricated by engine oil unlike the VP44 and the CP3 in 3rd gen trucks. However a conversion is pretty cost prohibitive if you are not pulling and trying to get the best of both worlds with the rpm and fueling capability of the P7100 and the flow of the 24V head.

You can buy a lot of VP44's for what it takes to convert to a P7100 so you are best to do just that but build the system properly where Dodge left off.

MotorOilMcCall 02-24-2009 02:06 PM

You don't need the mechanical lift pump, you can run an electronic pump like an AirDog or FASS. Other than that, Whits spot on...

Beets 02-24-2009 06:44 PM

PERFORMANCE PRODUCTS

here is a link that has a kit that includes almost everything. not inludeing a p pump and certain parts that are tuck/pump specif. it is about $1800

sstockton 03-02-2009 07:45 PM

Its not too terribly hard to do. Pump, timing cover and injection lines are the big ones. Any reputable diesel shop should be able to shim the injectors and set the pop pressure to what you need.

Injection lines run about $500-600, The cover is going to run you probably $200-500 depending on where you get it, and the pump is going to be the expensive part, Remanned pumps go for 900-1000 with a core charge, so you'll need a core pump, or have to pay more.

With all that said, the vp44's that are now available can keep up with many p-pump conversion and are very capable of producing the kind of numbers most anybody needs. And infact, stock vp's can yield numbers most people are happy with. The reliability is the main issue, and you can buy a few VP's for the cost of the conversion.
Sean

Beets 03-02-2009 08:50 PM

i talked to a guy who was going to do the swap and he had figured up, talk to a shop and priced everything he was going to need and he told me he was going to be able to do it for about $3500 that was buying a built pump he found on the internet for about 1300

sstockton 03-03-2009 10:20 AM

It really depends on where you find the the parts, and how hard you look for them. The lines are the one thing you're going to have to buy new, not to many people get ride of those after they make the swap.
Sean

Dr. Evil 03-03-2009 11:53 AM


Originally Posted by Whitmore (Post 294045)
Yes you can put a P7100 on a truck that once had a VP44. It is very expensive (10k~12k easy) and its tough! The main reason its done is to take advantage of the mechanical controls and the only ones who usually go about doing it are big time pullers who need a Cummins to spin upwards of 6000 rpm. The P7100 is the only one that can do it.

First off the injectors between the 12V and 24V are different and have different pop off pressures. The VP44 is actually able to deliver higher injection pressures so you would need to find a manufacturer to make a 24V injector pop off at low P7100 pressures.

The pump drive different and the timing case is different.

The P7100 requires the mechanical lift pump that comes with the 12V trucks. This is driven from a lobe on the 12V trucks camshaft. Your 24V cam doesn't have the fuel pump lobe.

So you need a new cam, new timing cover, custom 24V injectors designed to operate at the low P7100 injection pressure and lots of cash!

The P7100 is a great injection pump and is very versatile. Its durable because it is lubricated by engine oil unlike the VP44 and the CP3 in 3rd gen trucks. However a conversion is pretty cost prohibitive if you are not pulling and trying to get the best of both worlds with the rpm and fueling capability of the P7100 and the flow of the 24V head.

You can buy a lot of VP44's for what it takes to convert to a P7100 so you are best to do just that but build the system properly where Dodge left off.

That is not exactly accurate - the cost is no where near $11-12K...a buddy did his for $3-4k. He loves it and would not go back. He is using the 24V injectors as well.

scottsjeeprolet 03-03-2009 12:19 PM

Ya we just finished one on T.J's (Getblown5.9) truck. Not too hard, but his truck is going to be a pulling truck. And it wasn't that expensive. Just gotta know where to look for the parts.
https://www.dieselbombers.com/show-t...e-finally.html

Dr. Evil 03-03-2009 12:38 PM

The latest VP's are pretty reliable compared to the first ones that hit the market, but if you want power and reliability the P pump is king.

I forgot about that video already.


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