Help with emissions cam...
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Help with emissions cam... I am looking for a good emissions cam, something that has a little bit of spread to to but no more than 226 @.050 on the exhaust side. I am going to be running shorties with stock cats and full catback so a little extra exhaust duration should be advantageous but I need it to pass emissions. I talked to a couple of vendors today including texas speed. I like their 224/228 but according to them it may not pass emissions. If it was just a sniffer with no visual than some longtubes with highflow cats than that 224r would probably do the trick but I don't want a single pattern cam with such a restrictive exhaust. Where can I find a cam and if there are no on the shelf grinds anywhere, where do you guys go for custom grinds that are drivable and do not have lobes that will take a set of springs to pound town in 20,000 miles
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I was searching around this forum looking for some info and saw another member who installed what I believe was a Patrick G cam in his car and had quite a bit of valvetrain noise which he said was not due to improper pushrod length. That made me kind of nervous about those particular ramp speeds but there are a lot of variables there outside of cam design. Does he offer different lobe profiles for different applications and does he have a website or some way to contact? Thanks
Y no more than 226 ex duration? The cheatr might be what you want? Also look into ligenfelter cams. I went with a pat g spec 218/ 230 for California emissions legal cam. Did some other things aswell
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it seems that most of the things I have read on here said that any more than that and you are on the ragged edge of passing emissions and I do not want to toe that line. My last car was a smog legality nightmare and I do not want to run into those problems again. Passing smog was more of an afterthought and after getting the power that I got I did not want to choke it out with shorties and stock cats so instead I regretably sold it.
I was searching around this forum looking for some info and saw another member who installed what I believe was a Patrick G cam in his car and had quite a bit of valvetrain noise which he said was not due to improper pushrod length. That made me kind of nervous about those particular ramp speeds but there are a lot of variables there outside of cam design. Does he offer different lobe profiles for different applications and does he have a website or some way to contact? Thanks
Because I wanted a cam that worked with stock exhaust manifolds as opposed to headers it is relatively mild (218/230, 600 lift) and is on EPS lobes. It was originally installed with stock heads and stock rockers with the usual supporting mods (push rods, timing chain, dual valve springs). Later I went to Trick Flow heads with different push rods, Jesel rockers and a FAST 102 intake (which is known to amplify valvertrain noise). Neither of these setups exhibit any significant valvertrain noise. So I have no reason to conclude that cams with EPS lobes are inherently noisy. They are known for being easy on other valve train components.
In any event PatrickG specs cams on other lobes and can be reached here:
http://www.guerragroup.com/motorsports.htm
Last edited by Darkman; Sep 13, 2011 at 06:28 AM.
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How did your car run with that cam, I like the specs of it if it can pass the sniffer. I ran a 219/227 in my lt1 and really enjoyed it, I even stuck with it when I built the 383 and was even more impressed.
It is my understanding that if you move the cats from the factory location you will fail california visual inspection
It is my understanding that if you move the cats from the factory location you will fail california visual inspection
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I am about to buy Thunder Racing's Tru Torque Level 2 cam. 223/230 .609/.604 115LSA. I spoke with...dang...I am blanking on his name, but he's the head engineer over there. I told him that I'm in CA, I have stock manifolds, I want to pass emissions and want to break 400whp, have a strong torque level and still have a lope(mods in sig). After discussing for a couple of minutes he highly suggested this cam. He also said that he obviously can't gurantee anything, but he's almost positive I'll still pass smog, and I'll definitely be able to break 400whp w/ and LS6 manifold.
How did your car run with that cam, I like the specs of it if it can pass the sniffer. I ran a 219/227 in my lt1 and really enjoyed it, I even stuck with it when I built the 383 and was even more impressed.
It is my understanding that if you move the cats from the factory location you will fail california visual inspection
It is my understanding that if you move the cats from the factory location you will fail california visual inspection
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I am looking for a good emissions cam, something that has a little bit of spread to to but no more than 226 @.050 on the exhaust side. I am going to be running shorties with stock cats and full catback so a little extra exhaust duration should be advantageous but I need it to pass emissions. I talked to a couple of vendors today including texas speed. I like their 224/228 but according to them it may not pass emissions. If it was just a sniffer with no visual than some longtubes with highflow cats than that 224r would probably do the trick but I don't want a single pattern cam with such a restrictive exhaust. Where can I find a cam and if there are no on the shelf grinds anywhere, where do you guys go for custom grinds that are drivable and do not have lobes that will take a set of springs to pound town in 20,000 miles
-6* overlap, should pass with no issues.
EPS has a 218/226 113lsa cam, the Truck Torque 2, with -4* overlap.
http://www.engpwrsys.com/index.php?a...od&productId=5
http://www.engpwrsys.com/index.php?a...od&productId=5
