Engine/Transmission (1998.5 - 2002) injecion pump life ez/stock inj vs ez/275

[n4hwl]

I have the Edge ez on my truck and injectors are stock now. Would a bit larger injectors(275's or dd2's) be easier on the high pressure injection pump? My truck is a 1998 1/2 24 valve 2500. It seems to me that if the pump was pumping more into smaller injectors it would be harder on the pump than pumping the same amount throught larger injectors. This may be a foolish question but it probably won't be the last one I see on here.



Thanks

Ken

 

[Gary - K7GLD]

NO - not foolish at all!



I'm certainly no expert where the 24 valve and VP44 is concerned, but with my '91 12 valve, it was pretty well agreed the when modifying/adjusting the pump for greater flow, larger injectors were also a good way to get the fuel into the combustion chamber at the right point of combustion, and reduce pressure spikes as seen by the pump itself...



I would think the same principle would still apply to these later engines...

 

[Bigsaint]

The last time I was at Auto Wurks, I had a great conversation with Mike in regards to the VP44 and it's inner workings. Short of the elctronics on the VP, the VE and the VP are fairly similar in design, at least in regards to fuel delivery to the injectors. That was my take, anyway.



Regardless, the one topic I stand firm on in regards to making more HP is to use a larger injector, rather than more electronics, for the bulk of your power. This, IMHO, will lessen the strain on the injection pump as it's not be asked to perform outside of it's specs. Just my $0. 02, I maybe way off and loose my VP44 tomorrow, but I can't see how larger injectors will hurt the injection pump.



There are many here with much more knowledge than I regarding the VP44 and it's inner workings, perhaps they will jump in.



Scott W.

 

[Steve Campbell]

I will jump in on Scott's side...

My very first topic was on this exact same subject. I think that the larger injector route will do everything Scott said and more. Long story short... You can get the same fuel charge into the combustion chamber in a shorter period of time with larger injectors. You can also do it with higher pressure, but that is harder on the VP44..... IMO.

 

[JR2]

Here is some good reading by a guy who knows his stuff..... www.bluechipdiesel.com/Bosch-VP44.htm

 

[rspinks]

Totally agree with Gary, Scott and Steve. Boxes have advantages over injectors (timing, easy install), but they are making the VP44 push more through a small hole (especially with small ETH injectors). Injectors will get more fuel into the cylinders without increasing strain on the VP44. This is precisely why I am considering starting my bombing campaign with injectors and a boost elbow.