Increasing compression in a 6.0 L96?
#1
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So, my L96 needs to be freshened up bearings, pistons, etc. While I'm in there and have to buy pistons anyway, I was thinking of L77 pistons would be a nice way to increase compression from 9.6 to 10.4. Another thought would be to buy the stock pistons because they have valve reliefs in them to run more lift. Budget build. Looking for 500hp +,823 heads, truck intake, the car weights about 2900lbs, 4L60e trans, 3.55 rear end gears
#2
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I don't see why not... after all you're gonna need a fairly healthy cam to make enough RPM to make that much power, and such a cam will want higher compression anyway, so it's probably the right thing to do.
#3
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Take a look at Silvolite 3517HC, @WS6STORE sells them as part of their packages. Flat top 6.0 gen 4 pistons. Compare to L77, decide from there.
https://ls1tech.com/forums/generation-iv-internal-engine/1909285-new-flat-top-pistons-my-l96-gen-iv-6-0l-2.html
https://ls1tech.com/forums/generation-iv-internal-engine/1909285-new-flat-top-pistons-my-l96-gen-iv-6-0l-2.html
#6
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You will have more area "under the curve" (duration from .200" lift to .200" lift) if you have a greater amount of lift for a given duration from .050" to .050". So unless the port flow actually decreases with more lift (which would be unlikely), you will typically pick up power with more lift. That is, up until the point that valve train control becomes an problem, which definitely needs to be taken into consideration..
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#8
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Originally Posted by WE TODD DID
That’s 100% false. Not sure how you came up with that conclusion. The head is still moving air past peak lift flow. You’re lifting the valve before you get to peak flow, why can’t you lift it after?
#10
On The Tree
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If you have two cam lobes, both with exactly the same duration from .050" to .050", say 230 degrees. But one lobe has .350" of lift at the lobe "ground in" (.595" at the valve with a 1.7 rocker), and the other has .380" of lift at the lobe (.646" at the valve), which one do you suppose will get to .200" lift at the valve first, and stay above .200" lift longer? .300"? .400"?
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#11
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I put ls2/l77 pistons in my L76. might as well while your at it. You guys hijacked the thread, Yes bump up the compression while you at it. You'll make more power and you can still run plenty of lift!
Last edited by Sodak66; 12-07-2020 at 08:51 AM.
#13
On The Tree
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It's about getting the valve to peak flow as quickly as possible and keeping it there for as long as possible within a given duration window. That is, more often than not, going to involve lifting the valve past the point where flow no longer increases with additional lift. Unless you have a horrible port design (and they do exist) and flow actually decreases with additional lift (eg. port stalls), the port will continue to flow at max as you continue to lift the valve. But it will have spent a significant amount more time with that amount of flow, and you will have gotten to, say .150" or .200" lift (where flow is increasing very rapidly with increased lift) more quickly, and stayed above that amount of lift longer than you would by only lifting the valve to where flow stops increasing and then returning the valve to the seat.
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#14
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👆 Speechless....👍 He Knows the Facts.
#15
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So, my L96 needs to be freshened up bearings, pistons, etc. While I'm in there and have to buy pistons anyway, I was thinking of L77 pistons would be a nice way to increase compression from 9.6 to 10.4. Another thought would be to buy the stock pistons because they have valve reliefs in them to run more lift. Budget build. Looking for 500hp +,823 heads, truck intake, the car weights about 2900lbs, 4L60e trans, 3.55 rear end gears
#19
TECH Senior Member
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A .025 cut takes about 4cc out of the chamber. That plus whatever the .008 thinner HG adds gets him an 11.65:1 CR
#20
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So, my L96 needs to be freshened up bearings, pistons, etc. While I'm in there and have to buy pistons anyway, I was thinking of L77 pistons would be a nice way to increase compression from 9.6 to 10.4. Another thought would be to buy the stock pistons because they have valve reliefs in them to run more lift. Budget build. Looking for 500hp +,823 heads, truck intake, the car weights about 2900lbs, 4L60e trans, 3.55 rear end gears