LS7s suffering valve-train failures from mild after-market cams???
#21
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Originally Posted by Katech
We have never failed a stock rocker in all development, durability, and aftermarket testing.
Killer cam lobes are not all they are cracked up to be. Good job guys!
Andrew
#22
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Originally Posted by GOaT Cheese
What? I've never seen a lash cap wear to the point of causing a valve to drop. The lash caps are hardened steel,and the valve train noise would be rediculous before anything of the sort could happen.
If you have not had that happen, congrats, but it has happened
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Originally Posted by Stang's Bane
Talk to LG, Greg Good, Katech, and several others. They switch out the stock valves for a reason.
If you have not had that happen, congrats, but it has happened![Happy](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_stretch.gif)
If you have not had that happen, congrats, but it has happened
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#24
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Originally Posted by GOaT Cheese
I didn't say the valves weren't a problem, you said that the lash caps wear out and cause the failure, that is the issue I had with your statement.
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#25
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Originally Posted by Katech
Nope. We have never failed a stock rocker in all development, durability, and aftermarket testing.
On this note, are there even aftermarket LS7 1.8 rockers available if we choose to not run the stock LS7 one's?
#26
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Originally Posted by RC45
This is a strong endorsement for the stock LS7 rockers if ever I saw one.
On this note, are there even aftermarket LS7 1.8 rockers available if we choose to not run the stock LS7 one's?
On this note, are there even aftermarket LS7 1.8 rockers available if we choose to not run the stock LS7 one's?
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#27
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Originally Posted by Stang's Bane
The only ones I know of are the Jesel ones for a solid roller. I have heard of a few people making some custom ones as well. ![Devil](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_devil.gif)
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Seems if Jesel (as an example) are not making a replacment, there is not that much of a problem with the stock ones.
#29
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on LS7 heads that have the lash caps on the TI intake valve, any cam over .625 lift will cause the lash caps to drop off, then the head of the TI intake valve starts to wear rapidly untill you hear loud clicking noises. i have found that if you are using TI intake valves you have to use a modified lash cap which keeps it from falling off, or dont use the TI intake valve at all.
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#32
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Originally Posted by RC45
This is a strong endorsement for the stock LS7 rockers if ever I saw one.
On this note, are there even aftermarket LS7 1.8 rockers available if we choose to not run the stock LS7 one's?
On this note, are there even aftermarket LS7 1.8 rockers available if we choose to not run the stock LS7 one's?
http://www.slponline.com/view_produc...86&BIG=51186-1
#33
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I don't think those will work. The intake rocker is offset and I've only found jesel rockers that need machining (the head) to work. I've been waiting to hear from someone who has experienced this issue. I'm going to run my heads as they are and hope I don't have any problems. I will be monitoring the valvetrain periodically.
#34
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Originally Posted by bigblockb
I don't think those will work. The intake rocker is offset and I've only found jesel rockers that need machining (the head) to work. I've been waiting to hear from someone who has experienced this issue. I'm going to run my heads as they are and hope I don't have any problems. I will be monitoring the valvetrain periodically.
As Katech said, stock rockers are pretty durable unless you want to get nasty with the cam profile/valve motion. In that case, you are pretty much stuck with the Jesel system which ain't bad. Beyond that you are either on your own, or wait until someone steps up to the plate with a better system. The LS7 is still pretty new, and I'm not too sure how many folks are willing to pony up 3 large for a rocker system. If there was a market for that, I think it would happen.
The trend in higher end racing seems to be higher rocker ratios. 2.0 seems to be rather common, and ratios above that might be around the corner. Could that work in an LS engine? Someday somone will probably try. I hope he has deep pockets.
Jon
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Originally Posted by vtanju
on LS7 heads that have the lash caps on the TI intake valve, any cam over .625 lift will cause the lash caps to drop off, then the head of the TI intake valve starts to wear rapidly untill you hear loud clicking noises. i have found that if you are using TI intake valves you have to use a modified lash cap which keeps it from falling off, or dont use the TI intake valve at all. ![The Judge](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_judge.gif)
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#36
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I too am interested.. as we just rolled out this beast.. and I cant even hear a freight train let alone the valve train - so I would not know if it started "making a clatter".. ![Winky](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_wink.gif)
http://www.youtube.com/watch?v=0SLAVmayiCk
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http://www.youtube.com/watch?v=0SLAVmayiCk
#37
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Originally Posted by GOaT Cheese
I've built plenty of engines using lash caps, please explain how the caps "drop off"?
#39
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Originally Posted by Brian Tooley
Valve float will cause a lash cap to come off, an aftermarket hyd roller camshaft with fast ramps will cause valve float. Stainless valves aggravate valve float and isn't really a good option. Having a custom titanium valve made with a hardened tip is the way to go. We have customers that run up to 1.000"+ of lift with these valves and no issues, $740 for a set of 8
You meant "valve loft or valve toss" right? Isn't (unintentional) "valve loft" actually cause by inadequate control of the valve? I think there might be a better chance of getting (unwanted) loft with a lobe that dewlls at max lift like the (solid roller) LSK lobe family. You could also get it with a too-weak pushrod that flexed and acted like a pole vaulter's pole. I don't think a blanket statement like yours is the whole truth. We don't want to mislead folks.
Jon
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Originally Posted by Brian Tooley
Valve float will cause a lash cap to come off,