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W9 Valve Spring Recommendation
#3145042
05/16/23 09:25 PM
05/16/23 09:25 PM
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Joined: Apr 2016
Posts: 108 WNY
Moparrob68
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OP
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Joined: Apr 2016
Posts: 108
WNY
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While inspecting the W9 engine after last weeks Dyno session we found a broken intake valve spring. Looking for a recommendation for a good set of springs that will last in a bracket engine.
0.730 lift solid roller cam 2.15 Intake 1.62 Exhaust Titanium Valves 7800 RPM redline Current springs: PSI 1.58 OD 250 lbs @ 1.94 " 690 lbs @ 1.21"
Last edited by Moparrob68; 05/16/23 09:28 PM.
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Re: W9 Valve Spring Recommendation
[Re: Moparrob68]
#3145047
05/16/23 10:07 PM
05/16/23 10:07 PM
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Joined: Jan 2003
Posts: 5,486 SoCal
Brian Hafliger
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master
Joined: Jan 2003
Posts: 5,486
SoCal
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Probably not the springs fault...looks like your way off coil bind at max lift. You have to check lift at the valve with springs you plan to run, with lash adjusted. So if you have .700 at the valve, your waaaaay off of coil bind. You need to be around .050 off coil bind.
Brian Hafliger
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Re: W9 Valve Spring Recommendation
[Re: Brian Hafliger]
#3145055
05/16/23 10:33 PM
05/16/23 10:33 PM
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Joined: Apr 2016
Posts: 108 WNY
Moparrob68
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OP
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That's a picture of the broken spring with the valve closed. Springs were installed @ 1.925 that = 0.050 off of coil bind of 1.15 1.15+0.730+0.050=1.93
Last edited by Moparrob68; 05/16/23 10:34 PM.
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Re: W9 Valve Spring Recommendation
[Re: Moparrob68]
#3145060
05/16/23 11:16 PM
05/16/23 11:16 PM
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Joined: Jan 2003
Posts: 5,486 SoCal
Brian Hafliger
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master
Joined: Jan 2003
Posts: 5,486
SoCal
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Did you check valve lift with the springs installed and lash? Your not at .730!
Brian Hafliger
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Re: W9 Valve Spring Recommendation
[Re: Moparrob68]
#3145100
05/17/23 09:21 AM
05/17/23 09:21 AM
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Joined: Jan 2003
Posts: 14,514 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,514
So. Burlington, Vt.
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I’d call and talk to PSI and get some feedback from them. They might offer a more premium version of that spring, then it would be a “drop in”.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: W9 Valve Spring Recommendation
[Re: fast68plymouth]
#3145188
05/17/23 07:11 PM
05/17/23 07:11 PM
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Joined: Jan 2003
Posts: 6,149 Melbourne , Australia
LA360
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master
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Posts: 6,149
Melbourne , Australia
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I’d call and talk to PSI and get some feedback from them. They might offer a more premium version of that spring, then it would be a “drop in”. Or speak with Joe Hornick Enterprises PSI are probably some of the best springs on the market. If the valve spring broke, something is not happy in your valvetrain
Alan Jones
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