01-16-2021, 02:12 PM | #1 |
Drives: 17 SS a8 Join Date: Feb 2010
Location: omaha
Posts: 1,678
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Am I doing this right? Valve spring shims.
Am I doing this valve spring shimming correct?
1.790 installed spring height without any shims .635 valve lift 1.000 coil bind Target of .060 to .080 from coil bind. 1.790-0.635-1.000 = .155 current distance from bind. Shim of .075 to .095 to fall within specs? This is the btr rpm spring kit. Doesn’t that seem like a lot of shims?
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dropped a valve in the 6.2. now running a drop in rods and piston 5.3
best et 5.83@121 with the 5.3 http://www.camaro6.com/forums/showthread.php?t=465472 |
01-17-2021, 10:21 AM | #2 |
Drives: 2016 2SS coupe 2015 3LT Stingray Join Date: Aug 2012
Location: El paso texas
Posts: 880
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Coil bind for those springs is 1070 so at 790 spring height which is what btr speca you are golden no shims needed
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Ported intake manifold and throttle body kooks 2" headers no cats
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01-17-2021, 04:49 PM | #3 | |
Drives: 17 SS a8 Join Date: Feb 2010
Location: omaha
Posts: 1,678
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Quote:
here is the box. i was told i need to actually measure the bind so i did and came up with 1.009 which is closer to the number you said. if i use the 1.009 number that puts my new math at. 1.790-0.635-1.009 = 0.146 from bind so shims in the .086 to .066 range. my goal is high revs and very high boost. my understanding is i want to be near the .060 from bind. is this not correct?
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dropped a valve in the 6.2. now running a drop in rods and piston 5.3
best et 5.83@121 with the 5.3 http://www.camaro6.com/forums/showthread.php?t=465472 |
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01-26-2021, 12:18 PM | #4 |
Drives: 2016 2SS coupe 2015 3LT Stingray Join Date: Aug 2012
Location: El paso texas
Posts: 880
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I would call btr but the installed height on those springs according to the box is .710 not .790 so the 66 shims would work. What cam are you running?
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Ported intake manifold and throttle body kooks 2" headers no cats
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01-26-2021, 05:29 PM | #5 | |
Drives: 17 SS a8 Join Date: Feb 2010
Location: omaha
Posts: 1,678
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Quote:
I did talk to Brian Tooly and some other people. They said I am on the right track for a high boost high rpm low yearly mile set up. Brian did suggest I use an oil with some zinc in it because of the high pressure on the rocker arm tip. Cam is something like 232 duration and 635 lift.
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dropped a valve in the 6.2. now running a drop in rods and piston 5.3
best et 5.83@121 with the 5.3 http://www.camaro6.com/forums/showthread.php?t=465472 |
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01-26-2021, 10:43 PM | #6 |
Dumb Ass Deluxe
Drives: A Tricked Out Mountain Bike Join Date: Jun 2019
Location: Arizona
Posts: 1,956
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Out of curiosity, what are they considering "low yearly mileage"?
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01-27-2021, 12:37 PM | #7 | |
Drives: 17 SS a8 Join Date: Feb 2010
Location: omaha
Posts: 1,678
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Quote:
“Okay, you're on the right track then. Spring pressure is a double edged sword. Insufficient pressure leads to closing bounce which is destructive, but that amount of open pressure can be hard on valve tips so oil with a lot of zinc additives is recommended.”
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dropped a valve in the 6.2. now running a drop in rods and piston 5.3
best et 5.83@121 with the 5.3 http://www.camaro6.com/forums/showthread.php?t=465472 |
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01-27-2021, 09:30 PM | #8 |
Dumb Ass Deluxe
Drives: A Tricked Out Mountain Bike Join Date: Jun 2019
Location: Arizona
Posts: 1,956
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I wasn't expecting that low. That is drive it to the track, rip on it, drive home, and park it mileage...
More curiosity... lol... Are you running the stock style PVC/Catch can setup? Or, are you going something different with the Non Dexos oil? (I'm guessing there isn't any hi zinc formulated dexos 2 since there isn't really ANY dexos2 rated oils), or, is there some sort of zinc additive to add to the oil?
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01-27-2021, 10:01 PM | #9 | |
Drives: 17 SS a8 Join Date: Feb 2010
Location: omaha
Posts: 1,678
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Quote:
The crank case is vented to an open catch can. Oil has always been valvoline dexos2 or whatever it is we are suppose to use. I am going to try some “dominator” amsoil this year.
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dropped a valve in the 6.2. now running a drop in rods and piston 5.3
best et 5.83@121 with the 5.3 http://www.camaro6.com/forums/showthread.php?t=465472 |
|
01-28-2021, 12:12 AM | #10 | |
Drives: 2016 2SS coupe 2015 3LT Stingray Join Date: Aug 2012
Location: El paso texas
Posts: 880
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Quote:
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Ported intake manifold and throttle body kooks 2" headers no cats
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