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ecc_33 03-29-2005, 08:43 PM I was wondering whats the highest rpms you guys are running or heard of people running in a lb7 duramax. If over 4400 did you ever float the valves. Was there any damage. Just wondering i want to invest in a quad tuner and hook to the sled everyonce in awhile but am afraid of damaging the valve train heartbeatcanada 03-29-2005, 09:09 PM I've seen in the records on the attitude monitor 5971rpm before :eek: i've seen it up that high twice now.............no not my truck, but one i've driven several times :ro) ecc_33 03-29-2005, 09:50 PM did it have some kick a$$ head and valve work!!!??? ecc_33 03-29-2005, 09:51 PM And let me guess did the truck have twins:) heartbeatcanada 03-29-2005, 09:57 PM did it have some kick a$$ head and valve work!!!??? No heartbeatcanada 03-29-2005, 10:00 PM And let me guess did the truck have twins:) And no............we're not sure if it actually did hit that high, or it was just a fluke. I can say when it happened last week, we were going over 190kms(120mph) on the highway, and well, i'll let you fill in the blanks :eek: ecc_33 03-29-2005, 10:06 PM did the valves float Man i bet that was a he!! of a ride!! ecc_33 03-29-2005, 10:08 PM If i was a bettin man i would say that it was a fluke ecc_33 03-29-2005, 10:10 PM What we are taught at school is that every diesel engine is supposed to run alright 1000 rpms over the factory governor. After that the valves are supposed to float. Then the dreaded valve hitting piston. by then you have engine running off. By then you have way more problems then just valves floating Thank god i can just turn my key off and dont have to worry about the engine running off PEANUTGRWR 03-29-2005, 10:41 PM I Do Know From Experience That The Dmax Doesnt Like Rpms Much Above 6500 ;) ecc_33 03-29-2005, 10:44 PM ouch babe!!! i bet that one hurt Cougar281 03-29-2005, 11:20 PM Why is it diesels generally can't run at high RPM's? I know the powerband is real low, but my grandfather almost had a hear attack when I told him the Duramax can go up to 4800 or so under grade braking... The 4.6L gas engine in my car can safely turn 6500, If I where to upgrade the crank, rods, pistons and have it blueprinted, it could probably turn 7500+. Edit: My father said it has to do with the speed at which the fuel ignites. Is that correct? ecc_33 03-30-2005, 10:20 AM Thats a pretty good question. I dont think its because of the fuel igniting I have heard Dave Mitchel from enterprise engines or EEP running close to or over 9000 rpms | ||