I’ve had a bunch of questions regarding ppump upgrades, calibration, and stuff. The governor and the foot and that side of the pump seems pretty straight forward. Timing, while a bit of a pain, seems straight forward as well. Where I’m a bit uncertain is in the rebuilding/upgrading and the need for calibration. Here are a couple videos that seem to explain stuff, although I’m curious how accurate they are. Meyer (SP?) over on PDD did a good intro to the darned things here: https://www.youtube.com/watch?v=Og2I4mGu0u4 EdzGarage has a video (telling us NOT to mess with it) but some decent info. And while they don’t mention it, the “flag” for the #1 piston TDC is clearly visible. (the metal piece you align with the plastic insert dealio) https://www.youtube.com/watch?v=PBbdGI5mWFc Rob has a good video about upgrading the governor and the AFC assembly: https://www.youtube.com/watch?v=0XABcEDmgbA&t=712s There’s a solid video describing the actual calibration in an old Bosch video: https://www.youtube.com/watch?v=-aONWNgE1EI Aaaanyhow, here’s my question(s): if I were to take a 180 ppump, swap out the barrel, change the plunger to a 215 style plunger, and upgrade the delivery valves. Does this require a calibration? Looking at Rob’s video that discusses the spacers/washers on top of the DV, that they have to be saved or it will need re-calibration. (is that the same function as the shims on top of the barrel as shown in the Bosch vid?) I would guess that swapping a 215 cam into the pump would require calibration, regardless of anything else? The dang pumps seem fairly simple, but some of the details ilof it are like black magic or witchcraft.

Unboxing tonight!

Hi guys. Im currently getting into alot of engine machining work here at our shop and I got a question for Rob since he is the cummins guru haha. Valve seats, in a performance engine, would you recommend a different or "better" valve seat over a stock replacement one?

Installed the torque tech adj ofv… idle is 32 psi… seems high, light rev, 34-36 psi… no road test yet, but I’m thinking of backing it down a bit. Suggestions? Tow rig 3.54 gears auto 180 ppump…. Ok road test no adjustments made at all. After driving it down the street 20-25 mph sustained FP was up close to 38psi… open road 50-55 mph, FP dropped off to 8psi-10 psi, has not returned to any FP above 10 psi after 4 mile test drive. WTF?

What’s everyone’s thoughts on camshafts in daily driver trucks? Are they worth the extra money? I’ve looked at a few but haven’t noticed if they have a lob for mechanical pump? I know people talk about using the Vp camshafts but they don’t have the pump lobe.