Search results

So the Jakes don't lift the valve covers more than an inch or two then? Sent from my SM-N910V using Tapatalk

Jakes would be awesome. Almost had a 290 from a pusher bus but just missed it. Ken Sent from my SM-N910V using Tapatalk

On reflection the tour egt can get higher. I backed out of it Saturday night with 20+ on the truck at 1180. Depends on heat load and elevation. Weekends in July and August could have seen brief periods of 1300 in previous years. Ken Sent from my SM-N910V using Tapatalk

On the actual tours the egt is OK with one grade climbing to 1100 but the majority between 800 and 1000. Water temp never seem to rise much and sometimes on the morning runs the fan never kicks on. Makes me wonder if a lower thermostat could force egt down. Haven't thought about that before...

As for shifting, I am on motor 4, we already do that. Ken Sent from my SM-N910V using Tapatalk

Is the 8.3 as prone to torching pistons or does the turbo keep it cool enough? Ken Sent from my SM-N910V using Tapatalk

It is our belief after killing three 250s that the real culprit is egt despite the often cited liner pitting. I think the issue much worse on the 939 trucks because the automatic allows lugging. I am hoping to gather more egt numbers from 939s but what I see on mine is scary given what we are...

Crap those are numbers I am seeing too. I have never let mine go above 1250 but I could see how it could get there fast. Considering your manifold is shorter I bet piston temp is about the same. That can't be good for them and I don't have the fuel up. Ever found a chart from Cummins...

Nice. I get 1200 easy with steady acceleration empty then i back out of it. My probe is in the cast iron one inch up from the lower joint where the pipe joins. Ken Sent from my SM-N910V using Tapatalk

Almost ready to dump everything we know on burning out the 250 Cummins motors but I am trying to gather one last bit of info. I am looking for pyro numbers from other members. Would love the temp and where your probe is either as measured from the center of the exh manifold or in relation to...