Hey Guys,
I was hoping somebody could help me out with my CO numbers for my 69 280sl stick. I have borrowed a Gunson CO meter and come up with the following information.
650rpm Idle w/vac (I can't seem to get it higher) is 3.5% - 4.5%. Within spec from the manual.
1500 rpm is 11%-12% (should be 1.5 -3.0) From the manual
3000 rpm is 11%-12% (should be 0.2 -1.5) From the manual
The manual states that the 1500 & 3000 rpm should be under partial load. I don't have a dyno so this is all done parked in the driveway
What should I be able to gleen from the 1500 & 3000rpm CO readings if anything while just sitting in the driveway doing these tests? Can I use the numbers to make my CO adjustments. If so, I assume I could lean out the 1500 & 3000rpm ranges by removing shims in the WRD or BC and then increase richness at idle using the knob on the back of the pump. I have an adjustable bolt in the FIP where the BC goes to adjust the fuel mixture across all ranges.
Is the doable? Can I even look at 1500 & 3000rpm CO numbers without being on a dyno?
Here are my other specs:
Dwell 37.2
WRD Tested and working. Sucks in air when cold. No air getting sucked in when warm.
CSV & TTS Testing and working
Linkage to spec as per the linkage tour
Timing (w/vacuum) is 2 ATDC
Timing (w/o Vacuum) is 8 BTDC
Spark Plug Wires: New type. All measured at 1k Ohm.
Coil: Silver with Red Label
Ballast Resistor: Red (1.8ohm)
Distributor: 051 Cast iron (Retard with matching Retard Intake Manifold (vacuum connector on bottom)
Plugs: NGK BP5ES (Based on you recommendation several years ago
)
I have not tested timing at 1500 or 3000+rpm yet. Will get numbers tomorrow when fellow member 66andBlue comes over to help.
thanks