PTV Question on L92
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Launching!
Joined: Sep 2008
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From: Ashland,VA
PTV Question on L92 Just wondering if anybody knows how much cam lift you can go on a stock L92 engine(with valvetrain upgrades ofcourse) without cutting the pistons more than they already are. I see .612s and higher on L92s but not sure if thats on the stock pistons. Im deciding on my cam now and i dont want to have to do anything to the pistons.probobly going with a custom grind from comp. going with the stock head and short block setup. Im looking to stay around .600 to .610 lift which i think will be fine.what does everyone think? thanks.
Just wondering if anybody knows how much cam lift you can go on a stock L92 engine(with valvetrain upgrades ofcourse) without cutting the pistons more than they already are. I see .612s and higher on L92s but not sure if thats on the stock pistons. Im deciding on my cam now and i dont want to have to do anything to the pistons.probobly going with a custom grind from comp. going with the stock head and short block setup. Im looking to stay around .600 to .610 lift which i think will be fine.what does everyone think? thanks.
Last edited by 05JUDGE; Jan 23, 2009 at 10:37 PM.
Lift has very little to do with PTV clearances. It is your duration that will get you in trouble. I wouldn't suggest more than a 228 XER lobe for proper intake clearances. It has been a while but if I remember correctly the 230 XER lobe is .06x" to .07x" clearance on a 114 LSA + 2. It is not recommended to have less than .080" on the intake & .100" on the exhaust.
Thread Starter
Launching!
Joined: Sep 2008
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From: Ashland,VA
Lift has very little to do with PTV clearances. It is your duration that will get you in trouble. I wouldn't suggest more than a 228 XER lobe for proper intake clearances. It has been a while but if I remember correctly the 230 XER lobe is .06x" to .07x" clearance on a 114 LSA + 2. It is not recommended to have less than .080" on the intake & .100" on the exhaust.
You should select the cam that will meet your performance goals regardless of it needing to have valve reliefs or not. You can always flycut the pistons for added clearance. That will allow you to run a larger cam or mill the heads to increase compression. Both applications will increase performance.
Thread Starter
Launching!
Joined: Sep 2008
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From: Ashland,VA
You should select the cam that will meet your performance goals regardless of it needing to have valve reliefs or not. You can always flycut the pistons for added clearance. That will allow you to run a larger cam or mill the heads to increase compression. Both applications will increase performance.
Im still learning all this cam spec stuff but i do understand what it all means i think. If i go with a tighter LSA( say 110-112) will that give me more PTV clearance with 230 durration than say a 114 LSA at the same durration of 230? or does that not effect the PTV at all.thanks for any info..
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On The Tree
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here you go check it out
http://www.compcams.com/Technical/Ca.../pdf/page9.pdf
this only if your using the VVT CAM PHASER
http://www.compcams.com/Technical/Ca.../pdf/page9.pdf
this only if your using the VVT CAM PHASER
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Launching!
Joined: Sep 2008
Posts: 234
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From: Ashland,VA
Ok. thanks for the good info. the specs i was thinking about was around a .600/.605 , 226/236 with a 112 LSA. does this look like an "OK" cam for a stock L92 or should i do something different? Not tryin to be a pain in the *** just trying to gain alittle bit more knowledge on this stuff. thanks for the help.
Thread Starter
Launching!
Joined: Sep 2008
Posts: 234
Likes: 0
From: Ashland,VA
here you go check it out
http://www.compcams.com/Technical/Ca.../pdf/page9.pdf
this only if your using the VVT CAM PHASER
http://www.compcams.com/Technical/Ca.../pdf/page9.pdf
this only if your using the VVT CAM PHASER
Ok. thanks for the good info. the specs i was thinking about was around a .600/.605 , 226/236 with a 112 LSA. does this look like an "OK" cam for a stock L92 or should i do something different? Not tryin to be a pain in the *** just trying to gain alittle bit more knowledge on this stuff. thanks for the help.
Thread Starter
Launching!
Joined: Sep 2008
Posts: 234
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From: Ashland,VA
Last edited by burgers; Jan 25, 2009 at 10:31 PM.
Thread Starter
Launching!
Joined: Sep 2008
Posts: 234
Likes: 0
From: Ashland,VA
