![]() Selecting valid jets requires correct spring and progression tunning profile to find the best choice. |-40 thou" thick at tip|- 6587*E-6-|-100 Mean Bhp-|-83 Mean Bhp-| Chart 3: For 125 thou Jet SU, and Zenith/Stromberg CD needles NB: The needles are not interchangable between makes, and have a specific stamping number from which there is are 16 width measurements available from reference data. |-40 thou" thick at tip|- 5105*E-6-|-77 Mean Bhp-|-64 Mean Bhp-| Chart 2: For 100 thou Jet SU, and Zenith/Stromberg CD needles NB: The needles are not interchangable between makes, and have a specific stamping number from which there is are about 13 to 16 width measurements available from reference data. Jet Thickness| Annular jet Area|Power at 15.2:1|Power at 12.5:1| Chart 1: For 90 thou Jet SU, and Zenith/Stromberg CD needles NB: The needles are not interchangable between makes, and have a specific stamping number from which there is are about 13 to 16 width measurements available from reference data. Most SU or Stroberg set-ups are multiple, so adding hp readings allows you to estimate actual hp very accurately. Each gives hp per carb for each thickness of needle, and allows for normal lean or richer settings. Here's the answer, in three charts to ensure your Constant Depression carb is Constant Source of Happiness. *And weird thang four.some versions have a biased spring which pushes the 1.625 to 2 inch long needle against the jet, so the jet wears out enough for you to consider changing it each 20 000 miles, well, thats a crazy idea too.īut the worst thing is "How the freak to I select the right jet for it?" Zenith/Stromberg CD's have a composite diaphram too, just to keep you buying extra parts over its life.they do perish. * But the dashpot which holds an oil dampener with a spring which is linked to any alloy venturi. *Then to add a brass needle to punch through a main jet to create a squirt of gas, well, that's pretty weird too. *shaped like either a Budwiser bottle (SU or SK/Hitachi) or a small land mine (Zenith/Stromberg CD 125, 150, or 175). ![]() ![]() Most people wonder what the heck the 'Poms' were on when the devised a funny carb :. ![]() It's all about finding the right needle, and is nothing to do with drugs. For any American happy enough to want to use a Constant Depression carb, here is some info for you. ![]()
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