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Result of Seat/Open pressure vs. Coil Bind

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Old Feb 2, 2017 | 09:28 PM
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Default Result of Seat/Open pressure vs. Coil Bind
I am about to install the LS1512ML valve spring on my engine.
The advertise coil bind is 1.070"
Seat Pressure is 130lbs @ 1.800"
Open Pressure is 395lbs @ 1.150"

The camshaft max valve lift is .622".
Target is 0.050 coil bind at max lift.
Consequently install height is 1.742"

My question is what are going to be Seat and Open Pressure with the new install height?

Christian
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Old Feb 3, 2017 | 06:58 AM
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You can find the rate and calculate from there. I'm 99% sure PAC lists the spring rates on their website. It's normally expressed as lbs/in, so if it's a 350lbs/in spring rate, it should gain 35lbs for every .100", 3.5lbs for every .010", etc.
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Old Feb 3, 2017 | 07:08 AM
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Originally Posted by KCS
You can find the rate and calculate from there. I'm 99% sure PAC lists the spring rates on their website. It's normally expressed as lbs/in, so if it's a 350lbs/in spring rate, it should gain 35lbs for every .100", 3.5lbs for every .010", etc.

Thank you KCS,
Listed is... Rate Lbs/In : 408


Christian
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Old Feb 6, 2017 | 02:24 PM
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At 1.742" install height you effectively gained: 23.664lbs or 408 + 23.6 = 431lb open pressure.
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Old Feb 15, 2017 | 01:50 PM
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Is there any issue running those PSI LS1512ml at 0.050 of coil bind???


0.050 Coil Bind good or bad with those PSI???

Christian
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Old Feb 15, 2017 | 02:54 PM
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Originally Posted by miami993c297
Is there any issue running those PSI LS1512ml at 0.050 of coil bind???


0.050 Coil Bind good or bad with those PSI???

Christian
That's a good question to ask PSI, but I would be okay with it as long as you verify the valve lift. I measured the lobe lift and valve lift with the stock rockers on my last engine and got more valve lift than what a 1.7 should have given me. It was more like 1.72:1.
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Old Feb 15, 2017 | 03:38 PM
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Originally Posted by KCS
That's a good question to ask PSI, but I would be okay with it as long as you verify the valve lift. I measured the lobe lift and valve lift with the stock rockers on my last engine and got more valve lift than what a 1.7 should have given me. It was more like 1.72:1.



I just got off the phone with Dave at PSI, and he says that is a great set-up as long as I will be accurate with the install height...which I will triple check.


Christian
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Old Feb 15, 2017 | 04:10 PM
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Originally Posted by miami993c297
I just got off the phone with Dave at PSI, and he says that is a great set-up as long as I will be accurate with the install height...which I will triple check.


Christian
Sounds like a good plan.
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Old May 3, 2017 | 04:51 PM
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Following-up after some intensive testing.
Those PSI LS 1512LM are handling the Yella Terra 1.7 rockers without any issues revving to 7400rpm.
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