PRC dual valve spring broke
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Teching In
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PRC dual valve spring broke So i broke a PRC dual valve spring in a l92 head. End result was a Manley intake valve stem snapped.
Not sure if I can order just one valve spring from PRC but if one goes would it be highly recommended to replace all of them? Springs have about 15k - 20k miles on them.
Same w/ the valve. It was a Manley intake valve, are there any vendors that would sell just one or are you stuck purchasing all 8?
Not sure if I can order just one valve spring from PRC but if one goes would it be highly recommended to replace all of them? Springs have about 15k - 20k miles on them.
Same w/ the valve. It was a Manley intake valve, are there any vendors that would sell just one or are you stuck purchasing all 8?
WOW. is your cam hard on the springs? I would replace all of them and not just one. Then you have a full fresh set. I ran comp 921's in the past and run them in my l92's. Never had one go yet.
So i broke a PRC dual valve spring in a l92 head. End result was a Manley intake valve stem snapped.
Not sure if I can order just one valve spring from PRC but if one goes would it be highly recommended to replace all of them? Springs have about 15k - 20k miles on them.
Same w/ the valve. It was a Manley intake valve, are there any vendors that would sell just one or are you stuck purchasing all 8?
Not sure if I can order just one valve spring from PRC but if one goes would it be highly recommended to replace all of them? Springs have about 15k - 20k miles on them.
Same w/ the valve. It was a Manley intake valve, are there any vendors that would sell just one or are you stuck purchasing all 8?
Are you sure the valve spring went and failed the valve or is it the other way around? Not sure what your end results are but you should have the guide checked on that valve. Single valves can be purchased but make sure to explore why the failure occurred.
Last edited by vettenuts; Feb 13, 2010 at 07:43 AM.
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lift is .6 so the PRCs should take it fine. its an FI motor w/ 11 PSI. I was cruising in 6th at 65 mph when the spring went.
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I found the tip of the valve guide in the intake manifold. Lucked out that it didnt go into the piston or make it to a turbo. I guess that means im buying a new head if the valve guide is cracked off though.
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I might have a few of the old PRC springs left we could get you. We've switched to a all new spring now so I don't have much of the old stuff left. The new spring is a ground up redesign so it requires a new spring/retainer combo instead of just swapping to the new spring.
What color is the spring? Gold or Silver?
What color is the spring? Gold or Silver?
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Jason
Co-Owner, Texas Speed & Performance, Ltd.
2005 Twin Turbo C6
404cid Stroker, 67mm Twins
994rwhp/902lb ft @ 22 psi (mustang dyno) www.Texas-Speed.com
Do you have hollow stem stuff and Ti retainers??
I have been told that the stem to valve dia is huge and this requires getting as much weight as possible out of the valve side.
I have a set of hollows comming for mine along with PAC 1521 and Ti retainers. Not cheap
Tim
I have been told that the stem to valve dia is huge and this requires getting as much weight as possible out of the valve side.
I have a set of hollows comming for mine along with PAC 1521 and Ti retainers. Not cheap
Tim
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Do you have hollow stem stuff and Ti retainers??
I have been told that the stem to valve dia is huge and this requires getting as much weight as possible out of the valve side.
I have a set of hollows comming for mine along with PAC 1521 and Ti retainers. Not cheap
Tim
I have been told that the stem to valve dia is huge and this requires getting as much weight as possible out of the valve side.
I have a set of hollows comming for mine along with PAC 1521 and Ti retainers. Not cheap
Tim
stock exhaust valves and manley intakes, not hollow.
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From: Sydney
I know of a l92 headed 6.0l that got lunched due to a valve guide breaking recently. The forensics indicated it slowly came loose over a period of a few months and finally cracked which sent the valve wobling and kissing a piston then bang. First inspection looked like a broken duel valve spring until closer inspection revealed a problem that had developed over time .
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Which leads to the question,
Do Manley and other well known valve-train manufacturers offer hollow valves?
If not, why not?
As long as you are using the best quality springs available and changing them at the required interval recommended for hi-lift application the valves will stay where they are supposed to be.
Do Manley and other well known valve-train manufacturers offer hollow valves?
If not, why not?
As long as you are using the best quality springs available and changing them at the required interval recommended for hi-lift application the valves will stay where they are supposed to be.
Last edited by Sid447; Jan 29, 2010 at 01:11 AM.
Manley is a entry level valve. Others make hollow valves. Fererra does. GM, REV
You can put the best springs in the world on it but the more weight you have is going to cause issues. Lighter is better.
Tim
You can put the best springs in the world on it but the more weight you have is going to cause issues. Lighter is better.
Tim
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From: Alpharetta, Ga
While that is true, there are plenty of people out there running stainless valves(heavy) and rev'ing their hydraulic roller setups to ~7200rpm with a quality valve spring and having no float issues. Will a lighter setup be easier on parts, last longer, and allow for a spring with better harmonics? Yes, but that doesn't mean you can't go the other route as well.