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Originally Posted by pete
The unused cylinders will have reduced wear. I wonder if it would be worth the added expense of making all 4 cylinders deactivatable?
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All the pistons are still going up and down- that's a good deal of it right there. Today's engines have better cylinder materials than the play-doh that's been used in the past. I've seen cylinders in a Ford 3.0 with 150,000 miles on 'em that looked like the day they left the factory- no ridge, vivid crosshatching, etc. Contrast that with the cylinders of a small block Chevy from anytime pre-'80s or '90s- 100,000 miles on 'em and they probably need to be bored .030 to clean 'em up.
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Originally Posted by shovel
I'm curious though, wouldn't vacuum pull valves open a bit even if the cam wasn't pushing them? Especially with the help of manifold pressure on the other side of the exhaust valves..
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Ever tried to compress a valve spring?