Engine/Transmission (1998.5 - 2002) VP44 TO P7100 Pump

[KLockliear]

The 24v breathes better than a 12v. EGT is lower with same pump mods

I beg to differ. We did extensive testing over the years and have always found the 12v head to outflow the 24v head. Cummins went to the 24v head for emissions reasons, not airflow. There is virtually no swirl with the 24v ports, as there is with the 12v. From a performance standpoint, the 12v head will allow for lower EGT's at a given power level.

 

[MKreiberg]

So how about a list of the parts/numbers for those of us who don't have a 12 valve serial no. to punch into quickserve?

 

[DLane]

PM me a email addy and I will get you a list

 

[timbo]

I beg to differ. We did extensive testing over the years and have always found the 12v head to outflow the 24v head. Cummins went to the 24v head for emissions reasons, not airflow. There is virtually no swirl with the 24v ports, as there is with the 12v. From a performance standpoint, the 12v head will allow for lower EGT's at a given power level.

How about both heads being completey stock. which flows better?

 

[KLockliear]

The 12 valve. Joe D may have the actual numbers.

 

[timbo]

I beg to differ. We did extensive testing over the years and have always found the 12v head to outflow the 24v head. Cummins went to the 24v head for emissions reasons, not airflow. There is virtually no swirl with the 24v ports, as there is with the 12v. From a performance standpoint, the 12v head will allow for lower EGT's at a given power level.

If a 12v head flows better ( more air flow, less emission). So what exactly is the reason for the 24V head??

 

[ROADWARRIOR]

If a 12v head flows better ( more air flow, less emission). So what exactly is the reason for the 24V head??

Increased aftermarket valve guide sales.



Dan

 

[DLane]

I beg to differ. We did extensive testing over the years and have always found the 12v head to outflow the 24v head. Cummins went to the 24v head for emissions reasons, not airflow. There is virtually no swirl with the 24v ports, as there is with the 12v. From a performance standpoint, the 12v head will allow for lower EGT's at a given power level.

I would like to know more on this. What I do know at this time, had the same 913 pump on my 95 12v. Pulled it off before selling the truck. 95 had 215 injectors. This one wears II 3 flows. EGTs were 200* less on this one acrossed the board. Any ideas? 95 was a 5spd w/3. 55s , 2000 auto w/3. 55s

Not sure this is all attributed to the lower compression of the 24v, but I been wrong before, and will certainly be again.



Guess it really does not matter, what the reason is. It runs cooler. Now I can ad more fuel.

 

[HCannon]

Smokingoat, where is Tex? I live in Spur. I have a 99 that I am having a constant problem with. I have had two 12 v. and put over 300k on each and never had a problem. The pump change sounds good ( if not costing more than the value of PU) to me.

 

[KLockliear]

If a 12v head flows better ( more air flow, less emission). So what exactly is the reason for the 24V head??

I beg to differ. We did extensive testing over the years and have always found the 12v head to outflow the 24v head. Cummins went to the 24v head for emissions reasons, not airflow. There is virtually no swirl with the 24v ports, as there is with the 12v. From a performance standpoint, the 12v head will allow for lower EGT's at a given power level.

See the quote.

 

[RonA]

PDR Diesel Inc. The turbo diesel performance specialists! - Dodge Ported Heads



Ron

 

[Jetpilot]

I beg to differ. We did extensive testing over the years and have always found the 12v head to outflow the 24v head. Cummins went to the 24v head for emissions reasons, not airflow. There is virtually no swirl with the 24v ports, as there is with the 12v. From a performance standpoint, the 12v head will allow for lower EGT's at a given power level.

I found the same thing as Keith! The 12v head is a better performer... .



Doug

 

[Jim Fulmer]

Yea I remember the chart too, mine flows 213 intake and 191 exhaust at 500 lift... that's a stage 2 cam. These were done without cutting the intake off.



Jim

 

[HerbW]

I have a 12 valve P-7100 1998 truck. We take it elk hunting and I can dump all the extra kerosene for tent heaters brought along into the tank to get home on! You'll never have to worry about pump lube. Nice that the P pump is oil lubed! I always thought a 24 valve block with a P-7100 would be an ideal combo. Remember that the 03 and newer trucks have four normal doors instead of the quad configuration when considering trucks.