Perfect Carb!---Almost.

[Michael C Henry]

I'll be watching this tread. My car went through it's last emmissions test last year on a waver. My cruise hydrocarbon emissions were almost legal but my idle hydrocarbon emissions were over 10 and allmost 11 times the limit. I made some changes and had new primary metering blocks created with removable brass orifices to lean out the idle. I'm waiting to get the car through a frends computerized testing equipment to see where it stands now. I bought the brass screws and micro drills to manipulate the flows up or down once the portions are identified. I was also given a CNC machined holding fixture to hold the screws when drilling and facing.

[vector1]

Originally Posted by Michael C Henry

I'll be watching this tread. My car went through it's last emmissions test last year on a waver. My cruise hydrocarbon emissions were almost legal but my idle hydrocarbon emissions were over 10 and allmost 11 times the limit. I made some changes and had new primary metering blocks created with removable brass orifices to lean out the idle. I'm waiting to get the car through a frends computerized testing equipment to see where it stands now. I bought the brass screws and micro drills to manipulate the flows up or down once the portions are identified. I was also given a CNC machined holding fixture to hold the screws when drilling and facing.

drop your timing at idle and use a ported vacuum on the dist. or no vacuum advance at all. back in the 70's the vettes would run 6-8 deg. timing at idle to get around this, then set it back when your done playing with the dmv. tom kirkham has posted advance curve timing article lately in the forums that addresses this under the hei article.

[Bobcat]

Craig .... I`ll second the comment on the air cleaner possibly being too close to the vents on the carb . The top must be a minimum of 3/4" from the vents or it will cause all sorts of funky things to happen with the mixture .

Bob