Paging anyone that has had trouble with double springs and rockers
08-21-2002, 01:43 PM
#1
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Paging anyone that has had trouble with double springs and rockers Guys,
Can you describe what happens when you had your springs hitting the rockers?
Describe your dyno and AF ratio etc when this happens. How much did you clearance the rockers?
Cheers,
Chris
Can you describe what happens when you had your springs hitting the rockers?
Describe your dyno and AF ratio etc when this happens. How much did you clearance the rockers?
Cheers,
Chris
08-21-2002, 01:48 PM
#2
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Re: Paging anyone that has had trouble with double springs and rockers you'll get some extra valvetrain noise and your retainers will be screwed up.
<img src="https://ls1tech.com/howto/infopics/rockerclearance01.jpg" alt=" - " />
<img src="https://ls1tech.com/howto/infopics/rockerclearance02.jpg" alt=" - " />
<img src="https://ls1tech.com/howto/infopics/rockerclearance01.jpg" alt=" - " />
<img src="https://ls1tech.com/howto/infopics/rockerclearance02.jpg" alt=" - " />
08-21-2002, 03:08 PM
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Re: Paging anyone that has had trouble with double springs and rockers Email Vince, he can tell you ALL about this <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
08-21-2002, 03:14 PM
#4
Re: Paging anyone that has had trouble with double springs and rockers Chris,
When the valve closes, it wants to bounce off the seats. This gets worse at higher rpm (bigger bounce). If your rocker to retainer clearance is too tight (less than .050"), the valve can bounce up knocking the retainer into the bottom of the rocker arm, seriously upsetting the dynamics of the valve spring.
When this contact happens, it will make your motor seem just like it's experiencing valve float...but it's not. Mine occured at 6400 rpms. Wouldn't pull higher than 6500. My springs are good to at least 7500 rpms with the light valves and retainers I'm running. Something was FUBAR. Thanks to Vince and JMX for solving my problem. It kicked my *** for about 5 months!!!
When the valve closes, it wants to bounce off the seats. This gets worse at higher rpm (bigger bounce). If your rocker to retainer clearance is too tight (less than .050"), the valve can bounce up knocking the retainer into the bottom of the rocker arm, seriously upsetting the dynamics of the valve spring.
When this contact happens, it will make your motor seem just like it's experiencing valve float...but it's not. Mine occured at 6400 rpms. Wouldn't pull higher than 6500. My springs are good to at least 7500 rpms with the light valves and retainers I'm running. Something was FUBAR. Thanks to Vince and JMX for solving my problem. It kicked my *** for about 5 months!!!
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
08-21-2002, 03:21 PM
#5
The Bull
Re: Paging anyone that has had trouble with double springs and rockers This is what the stock rocker looks like with a 944-17 double.
<img src="http://www.sigma-epsilon.org/steve/images/performance/headcam/day4/MVC-163S.JPG" alt=" - " />
This is all the material I've removed.
<img src="http://www.sigma-epsilon.org/steve/images/performance/headcam/day5/MVC-178S.JPG" alt=" - " />
<img src="http://www.sigma-epsilon.org/steve/images/performance/headcam/day5/MVC-179S.JPG" alt=" - " />
I've had the covers off since then and I have no scratches in the retainers (after about 3000 miles on the car). So I guess I cleared them enough!
<small>[ August 21, 2002, 03:21 PM: Message edited by: derty ]</small>
<img src="http://www.sigma-epsilon.org/steve/images/performance/headcam/day4/MVC-163S.JPG" alt=" - " />
This is all the material I've removed.
<img src="http://www.sigma-epsilon.org/steve/images/performance/headcam/day5/MVC-178S.JPG" alt=" - " />
<img src="http://www.sigma-epsilon.org/steve/images/performance/headcam/day5/MVC-179S.JPG" alt=" - " />
I've had the covers off since then and I have no scratches in the retainers (after about 3000 miles on the car). So I guess I cleared them enough!
<small>[ August 21, 2002, 03:21 PM: Message edited by: derty ]</small>
08-21-2002, 03:26 PM
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Re: Paging anyone that has had trouble with double springs and rockers Cool thanks guys!
Cheers,
Chris
<small>[ August 21, 2002, 03:30 PM: Message edited by: Chris ARE 360 ]</small>
Cheers,
Chris
<small>[ August 21, 2002, 03:30 PM: Message edited by: Chris ARE 360 ]</small>
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08-21-2002, 04:18 PM
#9
The Bull
Re: Paging anyone that has had trouble with double springs and rockers I just cleared mine until I got about .040" clearance or more. Whatever you can do to move that away from the spring and the retainer the better. It only takes about an hour or two to do them all. I used a dremel tool with a grinding tip. Worked great and was very easy. Just don't breathe the dust!