08-15-2023, 07:30 AM | #1 |
Petro-sexual
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More Boost, But OEM Valve Springs
I already know I'll be doing the crap AFM-lifter delete, and planned on doing valve springs at that time, but that's either a ways down the road, or when I have a problem. But...
Is there any consensus on adding boost to the OEM LT4 valve springs? The way my is VVT set-up (and the rest of the combination), is I'll get up to about 16-psi right now (this is a stock long block). When I was messing around with VVT and VVE tuning, I do remember some weirdness when boost got as much as 18-19-psi (this was with 0* cam retard), but, if memory serves, I was running WAY RICH and (like 0.62 EQ, for example) and ignition timing was pretty low for safety, and thought some of the misfires could have been from fueling. I know boost can hold the valves open after a certain point, but I have no idea what that is on this platform. I'm casting a wide search on that, too, but I was wondering if anyone here had experience in the safety margin for the OEM valve springs? I know the correct solution is to replace them, but I don't want to do that until I do the lifters. And - I'd been thinking about dropping from a 90mm upper to an 85mm, for maybe a little more boost. I know of one other person who's done that, and I thought that was on a stock long block LT4, too, but wanted more information before I go that route. Thanks!
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'20 ZL1 Black "Fury" A10, PDR, Exposed CF Extractor Magnuson Magnum DI TVS2650R // RFBG // Soler 103 // TooHighPSI Port Injection // THPSI Billet Lid // FF // Katech Drop-In // PLM Heat Exchanger // ZLE Cradle bushings // BMR Chassis-Suspension Stuff // aFe Bars // Diode Dynamics LEDs // ACS Composites Guards // CF Dash // Aeroforce // tint // other stuffs |
08-15-2023, 07:49 AM | #2 |
Drives: 2022 Lt1 A10 Join Date: Nov 2015
Location: clark, mo
Posts: 8,860
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Back in the day when I had my 16ss with stock SBE I never had a valve spring failure running 18 psi of boost, we even saw 20 psi on a couple of passes. even after 180 passes and 12,000 miles. As everyone knows I did have two broken piston ring lands. Now that's not saying it couldn't happen but it didn't on mine and totally abused that engine and it finally gave up the ghost, I sure couldn't complain it, most have failed way before what I put mine thru.
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2022 Lt1 6.2 A10, Maggie 2300, THPSI Port Inj/10 rib, Rotofab, E, Nickey, SCOL, Griptech, RC Bandits, Hoosiers/MT 9.80@142.96 1.44 60ft, 6.34@112 707/669 RWHP/TRQ. 16SS Maggie 2650 9.41@147 1.35 60ft, 5.99@119. 16 C7 A8 10.90@128 Bolt on stuff
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08-15-2023, 07:55 AM | #3 | |
Petro-sexual
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Quote:
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'20 ZL1 Black "Fury" A10, PDR, Exposed CF Extractor Magnuson Magnum DI TVS2650R // RFBG // Soler 103 // TooHighPSI Port Injection // THPSI Billet Lid // FF // Katech Drop-In // PLM Heat Exchanger // ZLE Cradle bushings // BMR Chassis-Suspension Stuff // aFe Bars // Diode Dynamics LEDs // ACS Composites Guards // CF Dash // Aeroforce // tint // other stuffs |
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08-15-2023, 08:14 AM | #4 |
Drives: Chevy Camaro Join Date: Sep 2022
Location: IN
Posts: 193
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From experience on other platforms I would say the higher you get in boost the more critical it is to not over rev or tag a limiter. Things a spring with higher seat pressure might be able to handle. So having your trans shifting correctly for the load and enough tire for the surface you're on.
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'20 Camaro LT1
Twin 67/62 turbo 401(L8t) Texas speed forged piston & rod, BTR stg1 turbo cam, holley ultra lo, port injection, circle d 3600 stall, hoosier bias ply quick time pro's on racestar recluse wheels 1.45 4.01 6.07@120.74 9.28@153.43 '94 Camaro Z28 6mt cc306 cam, 4:10's, longtubes with x pipe, getting an engine rebuild |
08-15-2023, 08:20 AM | #5 | |
Drives: 2022 Lt1 A10 Join Date: Nov 2015
Location: clark, mo
Posts: 8,860
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Quote:
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2022 Lt1 6.2 A10, Maggie 2300, THPSI Port Inj/10 rib, Rotofab, E, Nickey, SCOL, Griptech, RC Bandits, Hoosiers/MT 9.80@142.96 1.44 60ft, 6.34@112 707/669 RWHP/TRQ. 16SS Maggie 2650 9.41@147 1.35 60ft, 5.99@119. 16 C7 A8 10.90@128 Bolt on stuff
Last edited by laynlo15; 08-15-2023 at 08:30 AM. |
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08-15-2023, 08:32 AM | #6 | ||
Petro-sexual
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Quote:
Thank you sir Quote:
I had been reflecting on LT5s, too. It was my understanding those were running the same valve springs (as in most of the rest of the long block) as LT4s, and those are rated for about 14-psi, too. Now - 14-psi is not 18-psi, but I also know there's a safety factor that's always baked-in. Hmm...
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'20 ZL1 Black "Fury" A10, PDR, Exposed CF Extractor Magnuson Magnum DI TVS2650R // RFBG // Soler 103 // TooHighPSI Port Injection // THPSI Billet Lid // FF // Katech Drop-In // PLM Heat Exchanger // ZLE Cradle bushings // BMR Chassis-Suspension Stuff // aFe Bars // Diode Dynamics LEDs // ACS Composites Guards // CF Dash // Aeroforce // tint // other stuffs |
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08-15-2023, 09:10 AM | #7 | |
Drives: Chevy Camaro Join Date: Sep 2022
Location: IN
Posts: 193
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Quote:
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'20 Camaro LT1
Twin 67/62 turbo 401(L8t) Texas speed forged piston & rod, BTR stg1 turbo cam, holley ultra lo, port injection, circle d 3600 stall, hoosier bias ply quick time pro's on racestar recluse wheels 1.45 4.01 6.07@120.74 9.28@153.43 '94 Camaro Z28 6mt cc306 cam, 4:10's, longtubes with x pipe, getting an engine rebuild |
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08-15-2023, 09:19 AM | #8 |
Petro-sexual
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Ooo. Thanks for the additional information
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'20 ZL1 Black "Fury" A10, PDR, Exposed CF Extractor Magnuson Magnum DI TVS2650R // RFBG // Soler 103 // TooHighPSI Port Injection // THPSI Billet Lid // FF // Katech Drop-In // PLM Heat Exchanger // ZLE Cradle bushings // BMR Chassis-Suspension Stuff // aFe Bars // Diode Dynamics LEDs // ACS Composites Guards // CF Dash // Aeroforce // tint // other stuffs |
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