Cams and Emissions
Tuned
Joined: Oct 2001
Posts: 328
Likes: 4
Cams and Emissions
I heard from a friend of mine to be careful about what cam to use in my (soon to be) new 390. He says if you get to radical, I'll have trouble passing emissions testing for Arizona.
Anyone have any ideas about this? What would be the largest cam to use without worrying about failing emissions?
I just want good low end torque. I will be driving it daily and don't expect to ever go much above 3000 RPM.
TIA!
Anyone have any ideas about this? What would be the largest cam to use without worrying about failing emissions?
I just want good low end torque. I will be driving it daily and don't expect to ever go much above 3000 RPM.
TIA!
Senior User
Joined: Oct 2001
Posts: 113
Likes: 0
Cams and Emissions
You will probably have to talk to the cam vendors on this to get specific models that will pass emissions testing. In general, if you have a more radical cam it has more overlap(lower lobe separation angle) which causes some exhaust dilution of the intake charge at lower rpms. These cams are not very efficient until they hit their range is usually higher in rpms than the stock cams. This is what causes the lope. To compensate for this you wind up having to fatten up the idle mixtures. That will get you a fail on an emissions test. Roller cam conversions are better at this because you can run wider lobe seperations and still have a fairly radical cam and it will pass emissions tests.
New User
Joined: Jan 2008
Posts: 0
Likes: 24
Cams and Emissions
Maybe have a look at this site.
http://www.compcams.com/catalog/
Dennis
Oh....Please Don't Ask Me Any Tough Questions As:
"I'm Saving Up MY Memory For When I Develop Alzheimer's"
78 F-150 429CJ C6 ,Silver w/Explorer Pkge
641/2 Mustang,Pre-World's Fair Car #8092
64 Fairlane S/C waiting for a 390-4spd.
68-Mustang.Sunlit Gold 80,000 miles
http://www.compcams.com/catalog/
Dennis
Oh....Please Don't Ask Me Any Tough Questions As:
"I'm Saving Up MY Memory For When I Develop Alzheimer's"
78 F-150 429CJ C6 ,Silver w/Explorer Pkge
641/2 Mustang,Pre-World's Fair Car #8092
64 Fairlane S/C waiting for a 390-4spd.
68-Mustang.Sunlit Gold 80,000 miles
