Kevin Marsh
Junior Member
I could use some suggestions for tuning a Weber 32/36 DGV carb to run at 4500 feet.
Some preliminary information on the engine; .060 overbore, Burlington counterbalanced crank with insert main bearings and insert connecting rods. Snyder 6:1 head, milled .025 because it had a twist so now perhaps 6.5:1? I am running an Otwell Health Heater (it was on the car when I drove it in High School in 1972), with an Aries exhaust system. I chose the Weber after reading all the positive posts with others using a similar engine configuration.
It came with the following settings: Idle Jets Primary, 55, Secondary 50. Main Jets Primary, 135, Secondary 140. Air Jets Primary 160, Secondary 165/
After completing the car last fall, I trailered it to my daughter’s home if Florida to visit them before they moved to Bahrain for two years. At sea level it ran beautifully. Now with the snow gone and warmer weather I am struggling at my altitude. I have been able to adjust the idle as configured, but the car runs rich and it hesitates under acceleration from 1500 to 1900 RPM and has terrible fuel mileage.
I have replaced the Primary Main Jet from 135 to 130, and the Primary Air jet from 160 to 170 with slight improvement. At the same time I purchased the Jets, I purchased a DVD from Pierce Manifolds to learn the tuning tricks and after watching it several times I have concluded that there is much more involved than swapping out the jets on a trial an error basis. With accelerator pump jets and emulsion tubes the combinations seem overwhelming.
To hopefully save some money on jets and the time needed to experiment with the numerous combinations, I am hoping someone here may have suggestions from their experiences tuning Webers for higher altitudes.
Any help is appreciated before I swap it all out for the Zenith….
Some preliminary information on the engine; .060 overbore, Burlington counterbalanced crank with insert main bearings and insert connecting rods. Snyder 6:1 head, milled .025 because it had a twist so now perhaps 6.5:1? I am running an Otwell Health Heater (it was on the car when I drove it in High School in 1972), with an Aries exhaust system. I chose the Weber after reading all the positive posts with others using a similar engine configuration.
It came with the following settings: Idle Jets Primary, 55, Secondary 50. Main Jets Primary, 135, Secondary 140. Air Jets Primary 160, Secondary 165/
After completing the car last fall, I trailered it to my daughter’s home if Florida to visit them before they moved to Bahrain for two years. At sea level it ran beautifully. Now with the snow gone and warmer weather I am struggling at my altitude. I have been able to adjust the idle as configured, but the car runs rich and it hesitates under acceleration from 1500 to 1900 RPM and has terrible fuel mileage.
I have replaced the Primary Main Jet from 135 to 130, and the Primary Air jet from 160 to 170 with slight improvement. At the same time I purchased the Jets, I purchased a DVD from Pierce Manifolds to learn the tuning tricks and after watching it several times I have concluded that there is much more involved than swapping out the jets on a trial an error basis. With accelerator pump jets and emulsion tubes the combinations seem overwhelming.
To hopefully save some money on jets and the time needed to experiment with the numerous combinations, I am hoping someone here may have suggestions from their experiences tuning Webers for higher altitudes.
Any help is appreciated before I swap it all out for the Zenith….
