I was going down a huge mountain and accidentally let my RPMs get up to 2700. What is the highest RPMs can go without damaging anything?
Highest RPMs should go?
Discussion in 'Questions From New Drivers' started by Jdm5jdm5, May 15, 2020.
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You risk blowing the turbo charger. Should stay below 2000.
Jdm5jdm5 Thanks this. -
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Mines only an 1800rpm max, 1925NL.
If the Jake's won't hold her back by 1925, I press the service brake & bring her down 7-9mph & repeat till I'm safely off the grade..Brettj3876, Hulld, Doealex and 2 others Thank this. -
Accidently ? How does that happen ? Must be an automatic or u would know u was in to low of a gear
HoneyBadger67, MGE Dawn, Jdm5jdm5 and 2 others Thank this. -
BIGLEFTYINTX, singlescrewshaker, Jdm5jdm5 and 1 other person Thank this.
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Typically on a large, 12-15L diesel you don't really want to get above 2,100 to 2,200 RPM.
Did 2,700 hurt it? Probably not. Issue with overspeeding is you start to see "valve float" at high speeds. The valve springs can't get the valve closed in time. You risk major valve train damage and a piston can smack a valve.
Then you add in the inertia of the pistons going from dead stop to full speed extremely rapidly. Very easy to throw a rod.
You've got the flywheel and clutch housing to worry about as well.okiedokie, Brettj3876, MACK E-6 and 4 others Thank this. -
If any of you are interested in seeing the carnage on the valvetrain from an overspeed, check out this recent thread:
Click Click Boom!!!!!blairandgretchen, austinmike, D.Tibbitt and 4 others Thank this. -
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