Passing Emissions

[plbs1234]

I have an 86 Caterham with a 1700 Super Sprint cross flow engine. It is equipped with dual Weber 40 DCOE carbs. Since this car is less than 30 years old I can not get classic plates which would avoid emissions testing.

 

I have to pass an idle emissions level of 1.2 ppm CO and 220 ppm hydrocarbons. I ended up testing 5.62 ppm CO and 2961 ppm hydrocarbons.

 

I know Caterham has a fairly aggressive cam to get 135 hp from this engine. Should I be able to tune the timing and carbs to pass this test? Any suggestions would be very welcome.

 

Thanks,

 

Paul

[SkinnyG]

High CO and HC means running rich. The cam could certainly be contributing to this, as could tune. Are you running a catalytic converter? A cat and a good tune might be enough to squeak through.

[rx7locost]

From what I see, Idaho is one of the Sema states.

 

You might consider re-titling it as a "replica vehicle". As such you would only have to meet the emissions of the vehicle your car is replicating (say, 1963 Lotus Seven?)

 

The down side is that you may want to retain the "Caterham" name on the title.

 

Change the title, or change the car....... hmmmmmm.......