Max rpm before valve/studs upgrade
02-19-2011 | 02:58 PM
#2
DTR's "Cooler than ice cubes 14 miles North of North Pole" member
Joined: Oct 2006
Posts: 1,797
Likes: 9
From: 14mi North of North Pole
You start heading above 4000 you're gonna need the 60lb valve springs.
BC did a great (as always) write-up on the valve spring up grade. Look under performance in the sticky.
BC did a great (as always) write-up on the valve spring up grade. Look under performance in the sticky.
02-19-2011 | 11:44 PM
#3
Registered User
Joined: Sep 2004
Posts: 4,026
Likes: 129
From: Tijeras, New Mexico, 7,000ft up
Head studs are usually determined by boost pressure, not necessarily RPM. According to a Cummins engineer I spoke with, mechanical damage on a stock engine occurs starting about 5,000 RPM.
02-20-2011 | 10:42 AM
#5
Registered User
Joined: Sep 2004
Posts: 4,026
Likes: 129
From: Tijeras, New Mexico, 7,000ft up
I would agree with that. I am at 40PSI and on 3,200 rpm blasts I lose a fair amount of antifreeze down the side of the block. Waiting for better weather (and a bottoming tap) to put my ARP's in.
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