runnin' the valves

[BlackRam2500]

Comes down to the simple fact that all metal expands... So at full operating temp how much expansion of metal do you have? Now that things tighten up and running higher RPM's how much valve float or interference would you have? There is a reason for why Cummins has these valve set this way... (Yes. I know the shrug smiley is AWOL!) :banghead:

This. Its one thing to cheat the specs on a slant 6... on a Cummins, might oughta take a hint from the engineers unless ya got free cash to spend on a couple of hp. Just my

[guesswho512]

i feel like i'm not being heard. even at 0.15 is in cummins approved specs. this is not a made up #. my quotes are straight from the 2001 Factory Service Manual.another thing to think about. every time i have ran my valves, they are the same gap or loose. i have never had the gap shrink(i don't run the valves on a hot motor). it always "loosens" up. the engineers and scientist make the specs. the fact that SASQCH had CUMMINS do his first lash and they set it at .008in and .017ex says to me, either they know it will loosen with time or that there is some benefit to running them a little tight. :2cents:now i probably won't run .006in and .015ex but i find it strange the FSM says, "Engine operation within these ranges has no adverse affect on performance, emissions, fuel economy or level of engine noise." when everyone immediately reports that their trucks are quieter.

[Mopar1973Man]

True in might be in the service manual and within spec... But something about tighten up the clearance even more that typical bother me...

[guesswho512]

after dealing with my problem(http://forum.mopar1973man.com/showthread.php/2966-i-need-advice) i ran the valves and set them to .008 and .017 after a quick 8-10mile lap around, i can tell a difference...now mind you, i had one way out of spec...but no damage and smooth sailing....will report back in a few days

[guesswho512]

well its has been a week. the power is smoother and comes on lower in the RPM range. i don't have a boost gauge, but i felt like the turbo wasn't spooled until 1800-1900RPM. it feel like it "lights" at 1600 RPMs now. still not enough time to tell about MPG but i DO NOT think it is any quieter...my coworkers joke that i cannot sneak in our out of the yard without anyone/everyone knowing.

[white01]

so you like .08 and .017 huh?not quiter but the charger light's alittle sooner?sweet if it does that!!