redlining
Thread Starter
Burning Brakes
Joined: Mar 2008
Posts: 1,038
Likes: 39
From: Denver, CO
St. Jude Donor '08-'09-'10
redlining
ok, so ive read a few times on here that different engines had different redlines ie: 6500 vs 5500... and so on. my question based on this infomation is what would happen, if anything, if you took the base engine whose redline is 55 to 65 rpms? obviously it is going to be under more stress... but why are they different?
Pro
Joined: Mar 2005
Posts: 635
Likes: 118
From: Lakemont, GA
The redline is determined usually by max piston speed or valvetrain stability, my motorcycle is piston speed limited and most 350 V8s are valvetrain limited. Operating an engine above its redline will cause "valve float" and valve spring issues. You can get away with it once or twice, but you will break stuff if you make it a practice.
You can get a lot of good info on manufacturers websites.
Good luck, Chris
You can get a lot of good info on manufacturers websites.
Good luck, Chris
Tech Contributor
Joined: Aug 1999
Posts: 14,379
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From: At my Bar drinking and wrenching in Lafayette Colorado
Lars
Melting Slicks
Joined: Feb 2004
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From: State of Confusion!!!
2018 C2 of Year Winner
all you are doing is making noise...not power!!!
Melting Slicks
Joined: Mar 2002
Posts: 2,164
Likes: 7
From: Beringen
Rpm is basically determined by how much air your engine can inhale at that rpm level. This has everything to do with your top end, manifold, carb, camshaft selection.
Mostly the engines run first into valve float and then the bottom end which is not strong enough. You could however make your engine rev past its rpm range for which its bottom end was intended with changes to the aboven mentioned items, but it will only blow up itsself.
Mostly the engines run first into valve float and then the bottom end which is not strong enough. You could however make your engine rev past its rpm range for which its bottom end was intended with changes to the aboven mentioned items, but it will only blow up itsself.
