Cams and Emmission Testing

[jayro]

I was wondering what effect cams would have on being able to pass emmisions? If you had a good tune and good cats would you still be able to pass with +20's,+40's or TriFlows? What about HC pistons? They don't have testing here, but I am curious. Thanks

Jeremy

 

[sperold]

Not exactly the same, but I know a guy with a PT Cruiser (4-cyl) that installed a modern day Hemi (around 350 cubes and 8 cylinder), and he passes the E-Test for the original set up. He owns a muffler shop, so he was able to get good converters and I think he tuned it to get the results he needed for the test and then re-tunes it for the other 2 years of operation.
Compared to that, your changes don't sound so radical, so I would think it would be a go.

 

[jayro]

Not exactly the same, but I know a guy with a PT Cruiser (4-cyl) that installed a modern day Hemi (around 350 cubes and 8 cylinder), and he passes the E-Test for the original set up. He owns a muffler shop, so he was able to get good converters and I think he tuned it to get the results he needed for the test and then re-tunes it for the other 2 years of operation.
Compared to that, your changes don't sound so radical, so I would think it would be a go.

Thanks for the info. We don't have emmissions testing here, so I don't have to worry. If the motor swap you mentioned was swapping in a modern STOCK or mildly modded Hemi, then yes it would pass emissions.....it shouldn't matter too much what body the engine is in. I was wondering what effect a bigger cam or raised compression would have on emmission testing.

 

[jayro]

Nobody?

 

[Lorenr]

Should be No Problem

Emissions testing is primarily designed to detect a poorly burning air fuel system. If your tune is accurate for the Ford ECU then you are in good shape.

My old 3.0 motor had 180,000 miles on it and always went through emissions with superior results. The catalytic system was newer, plugs were the correct ones, wires were good and there were no codes, air filter and related components were good.

Different camshafts would never have changed it that much. DO however make sure that all fuel system parts are operating properly. A little bigger camshaft won't fail emissions. Normally.

 

[AREA 91]

A bigger cam ='s more overlap.
More overlap ='s unburned fuel pumped out the exhaust.

 

[Lorenr]

Yes, But

That is probably true about the "overlap" providing there is "overlap".

Just because the camshaft has higher lift or longer duration does not mean that unburned fuel goes past the exhaust valve. You must discuss this with the camshaft manufacturer. The optional cams I've seen discussed for these SHO motors are actually pretty mild and I'd be surprised if they had any overlap. Even if they did the catalytic converter would catch it. I'm pretty sure they'd pass the test.

Most of these camshafts are not used by the manufacturer because the buyer would rarely need or want them, not because they will not pass emissions.

 

[SeanMc]

I pass with flying colors here in California. Just make sure you change your oil before, and get the thing warm, real warm.

 

[Ishodu]

SHO NUT passes each year or 2 with his car. +40s and lots of boost. He has a new Y pipe he uses for it and maybe a little bit of tuning. But normally following the car your eyes burn from the fuel.

 

[jayro]

Thanks. I started wondering why Ford/Yamaha didn't use a more aggressive cam profile in the engine to give it a little more punch. I thought maybe it was for emmission reasons. Guess not. But then I don't know why they bothered putting 3.0 in MTX once they developed the 3.2 for the ATX. Why make 2 different blocks and rotating assemblies? It doesn't make since to me.

I think I have too much time on my hands.

 

[AREA 91]

Thanks. I started wondering why Ford/Yamaha didn't use a more aggressive cam profile in the engine to give it a little more punch. I thought maybe it was for emmission reasons. Guess not. But then I don't know why they bothered putting 3.0 in MTX once they developed the 3.2 for the ATX. Why make 2 different blocks and rotating assemblies? It doesn't make since to me.

I think I have too much time on my hands.

Ford can't have a Taurus that's faster then it's Mustang.

 

[jayro]

Ford can't have a Taurus that's faster then it's Mustang.

If that the only reason, it's kinda lame. They should tell the Mustang designers to step up rather than telling the SHO guys to slow down!!!

 

[zach44102]

If that the only reason, it's kinda lame. They should tell the Mustang designers to step up rather than telling the SHO guys to slow down!!!

SVO was the reason the yemaha motor was created. Same people who made the mustangs.

 

[jayro]

SVO was the reason the yemaha motor was created. Same people who made the mustangs.

I'm just saying it should have pushed them to increase performance on the Mustang instead of holding back on the power of the SHO. With a few fairly easy changes they could have change it from 220hp/215ftlbs (3.2) to the 260hp/235ftlbs range.