Turning Up A 12 Valve - Page 2 - Diesel Bombers



94-98 12V Cummins 5.9L P7100 Tech Talk '94-'98 5.9L Cummins 12-Valve P-9100 Tech Articles

 
 
 
 
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  #11  
Old 12-22-2007, 03:54 PM
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I hope he has a pyro...
  #12  
Old 12-23-2007, 10:52 AM
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ya, but i got to thinkinhg the other day who actually watchtes it , im sure lots do wen towing but i really doubt any ever really watches it racing, i know i dont , i just always had them to be cool
  #13  
Old 12-23-2007, 12:27 PM
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Well, we're ordering a pyro and clutch tomorrow. What is a good clutch that aint gonna kill the pocketbook?
  #14  
Old 12-23-2007, 01:07 PM
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I would just go ahead and get a south bend that way you wont have to worry.
  #15  
Old 12-23-2007, 01:34 PM
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Quote:
Originally Posted by stillbad View Post
I would just go ahead and get a south bend that way you wont have to worry.

I second that
  #16  
Old 12-23-2007, 01:35 PM
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The steps for turning up a P7100 pump are:
1) Remove your AFC Housing
2) Mod Your Fuel Plate either slide it forward or purchase a cut one
3) Adjust the governor lever to contact the fuel plate
4) Crank the star Wheel Towards the motor
5) Slide The AFC housing all the way forward
Details Below......

First of all Know Your Pump
Only 1994-1998 trucks have the P7100 Pump
The Control Parts List number or CPL number is located on the engine data plate, which can be found on the drivers side of the timing gear cover. The engine data plate includes such information as the CPL number, engine serial number, and pump timing information.
Engine Model

160hp

180hp

215hp
(California)
195 HP
CPL
Numbers
1549, 1550
1551, 1552
1553, 1815
1816, 1959
1839, 1968
2022
2174
2023
2175
1863
AFC Removal


If you do almost any pump work you have to take the AFC housing off.
Remove front passenger side AFC housing break off screw. NOTE: This screw is a factory break off screw with rounded head and no screw driver, allen head or TORX slot. Use a hand impact tool with a 6 inch long 1/4" extension and a T15 TORX bit to remove this screw. A center punch may be required to start a hole in the center of this screw. Set the hand impact tool in the removal position (counter clockwise) and use light hammer taps on the impact tool to loosen this screw. Tap progressively harder on the impact tool until the screw loosens. This method of removal forms a TORX shape into the screw allowing it to be reinstalled later with the T15 TORX bit. In some cases the hole in the top of this screw is too large for the T15 bit thus use the T20 TORX bit. There is usually a lock washer and flat washer under each of these screws. OPTIONAL: A sharp chisel can be used to remove the break off screw by making a notch in the outside diameter of the head, then applying a tangential force with light blows to the chisel counterclockwise to remove the screw.

AFC Cut Away

Fuel Plate


With the AFC housing removed you can now see the fuel plate .
Sliding the stock plate will increase HP quite a bit. However, the stock plate profile is not designed for that so the result is usually EGT problems. Home ground plates are not a good idea either. Pump experts say to NEVER remove the plate completely. There is a pin in the pump that will eventually wear and break causeing very expensive damage. Slide the plate ATW Foward and if you still want more contact TST for a Cut Plate , they will recommend one for your truck

This is what it looks like under the fuel plate
Governor Lever Adjustment


This is a cut away view of the governor of a P7100 pump. Notice how the lever hit the cam plate flush at the very bottom edge. To check your adjustment the throttle lever needs to be moved until the lever just touches the cam plate. With the AFC housing removed, look down through the opening behind the cam plate and see where the lever is striking the plate. This should be done with the Fuel Shutoff Solenoid in the run ( or pulled up ) position.
Where the lever strikes the cam plate will vary depending on the style and design of the cam plate you are using. For plates similar to the stock plate, like shown below, this lever is set correctly. It is adjusted so the lever is flush with the bottom edge of the plate, and does not ride under the plate.
(Picture Courtesy of BD Power)

For cam plates, like a TST #6 for example, that have a taper at the very bottom of the plate, adjust the lever so the lever hits at the tip of the bottom nose on the plate. It is OK to be slightly below that. However too far down causes the lever to be held back as the RPM's rise. This causes the loss in bottom end power, with the sudden surge as the lever finally clears the nose and hits the main fueling curve.
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  #17  
Old 12-23-2007, 01:36 PM
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This is what the pump looks like from the back with the cover removed. Do not change the adjustment in the upper right hand corner. The adjustment in the lower left hand corner is the one to make. Loosen the locknut ( 10mm socket required ). Making very small adjustments to the screw, adjust the lever the proper height. Now tighten the locknut.
One thing to realize about the plate is that it is properly called a full load throttle stop. What this means is that if you are not running at WOT or close to it the plate is not doing anything. It's just taking up space in the pump.
Star Wheel Adjustment


To adjust, remove the large plug on top of the AFC housing using an 8 mm allen wrench. Take care not to loose the sealing washer under the plug. Removing the plug exposes a star wheel which changes the quickness of fueling response to boost. If acceleration is weak with minimal smoke, rotate top of the star wheel toward the engine a few revolutions. If vehicle has heavy black smoke on initial acceleration, rotate top of star wheel away from engine a few revolutions. Reinstall large plug with sealing washer and test drive vehicle again. It may take repeated attempts to get this adjustment set. If heavy smoke is still encountered with star wheel moved completely to rear position, loosen AFC housing and slide it rearward a 1/16 inch, retighten and test again. Repeat unit desired results occur.


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  #18  
Old 12-23-2007, 03:55 PM
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Great detailed explanation with pics DieselMinded.
  #19  
Old 12-23-2007, 09:31 PM
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thanks a lot guys, everything i wanted to know.
  #20  
Old 12-25-2007, 12:35 AM
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deff gonna wanna buy a nice south bend clutch so your friend doesn't have to buy two clutches. grind a 0 plate and buy whatever the next step up from a con o is. and i would recommend buying isspro gauges a 0-60psi boost and pyrometer if possible get both of them from vulcan performance for 216 with a pillar. pretty damn cheap, i shopped around
 
 
 

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