Lingenfelter Gt2-3 Cam???
03-15-2012, 10:21 PM
#21
Staging Lane
iTrader: (1)
Join Date: Nov 2011
Location: Glendora, CA
Posts: 58
Likes: 0
Received 0 Likes
on
0 Posts
I know this thread is old but I'm considering this camshaft LPE GT2-3 or possibly GT11 with 215/231 .631/.644" 118.5 lsa. But I'm wondering if they will pass smog? Can anybody confirm this?
03-15-2012, 11:16 PM
#24
It has -14 degrees overlap, if you are looking at the lift at .050", but would need to know duration at .005" to get actual overlap for smog. It does have some high lift,so you would need some great valve springs and check spring pressure every 10,000 miles or so
03-15-2012, 11:42 PM
#26
Staging Lane
iTrader: (1)
Join Date: Nov 2011
Location: Glendora, CA
Posts: 58
Likes: 0
Received 0 Likes
on
0 Posts
So then you think the GT2-3 will be ok on cali smog? I contacted LPE and they said they haven't smog tested them so they can't say for sure, but it seems small enough..?
03-16-2012, 12:08 AM
#28
Staging Lane
iTrader: (1)
Join Date: Nov 2011
Location: Glendora, CA
Posts: 58
Likes: 0
Received 0 Likes
on
0 Posts
So does that mean the intake and exhaust have to be within 4 numbers of each other? For example ive been told that the tsp 224/224 cam WILL pass smog. Is that because they are within 4 degrees? Sorry for the noob question
03-16-2012, 12:45 AM
#29
No, that just happens to be the largest amount of valve overlap(-4*) that will most often allow your engine to still pass SMOG with a good tune.
Here's a easy way to find the valve overlap. Example: 221/224 115 lsa .
Add your intake and exhaust lobe .050" lift durations together, divide by two.
221+224= 445, 445 / 2 = 222.5 .
Now take your LSA and multiply it two, 115 x 2 = 230 .
222.5(Duration) - 230(LSA) = -7.5* overlap.
FYI, if the LSA is greater than the duration then the overlap is -negative.
Last edited by 99Bluz28; 03-16-2012 at 12:52 AM.
03-16-2012, 12:53 AM
#30
No, that just happens to be the largest amount of valve overlap(-4*) that will most often allow your engine to still pass SMOG with a good tune.
Here's a easy way to find the valve overlap.
Add your intake and exhaust lobe .050" lift durations together, divide by two.
Example: 221/224 115 lsa, 221+224= 445, 445 / 2 = 222.5 .
Now take your LSA and multiply it two, 115 x 2 = 230 .
222.5(Duration) - 230(LSA) = -7.5* overlap.
FYI, if the LSA is greater than the duration then the overlap is -negative.
Here's a easy way to find the valve overlap.
Add your intake and exhaust lobe .050" lift durations together, divide by two.
Example: 221/224 115 lsa, 221+224= 445, 445 / 2 = 222.5 .
Now take your LSA and multiply it two, 115 x 2 = 230 .
222.5(Duration) - 230(LSA) = -7.5* overlap.
FYI, if the LSA is greater than the duration then the overlap is -negative.
03-17-2012, 01:12 AM
#33
Staging Lane
iTrader: (1)
Join Date: Nov 2011
Location: Glendora, CA
Posts: 58
Likes: 0
Received 0 Likes
on
0 Posts
Wow a lot of good info thanks guys! Now hearing about the new smog laws (not requiring the tail pipe test for 2000 and up cars) taking effect in January, I'll be okay with the cam I want!
