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Found 3 results

  1. Hi All, 90 days of preparing the 1973 240Z (L28 engine) to breath again, asleep for 17 years. Read all the posts on 3 screw SU have the Ztherapy video as well. With all that said, the car has not cranked over in 17 years, little more complexed then a baseline tune up. Completed the basic fuel mixture setting on the SU's, 2 1/2 turns down. Car backfires out of both carbs. With minor advancements to the setting (richer) the car will progressively start quicker but still backfires (more from the front carb then rear). After an hour of stop, restart, minor adjustments to the carbs the engine now backfires (carbs), stalls and then revs at high rate, repeats the process, until the revs get too high need to shut down. Carbs just rebuilt and I reset the floats to spec. Is this a needle, jet, timing, other issue or operator error? Car specs, 1973 240Z with a L28 with a bunch of transplanted L24 parts. Distributor, L24 single point with a vacuum advance, rebuilt and installed. N42 head, B cam. I believe the 3 screw SU carbs and manifold (N33) are from the L24 engine, not sure? Any advice would be wonderful . Thanks.
  2. I recently ordered individual ITG air cleaners/filters and air horns from Motorsport Auto for the SU carbs on my '71. This is to replace the stock air cleaner with integral air horns. This is what I ordered: http://www.thezstore.com/page/TZS/PROD/classic17a02e/11-3025 http://www.thezstore.com/page/TZS/PROD/classic17a03/11-3014 Anyone have experience with these? I have a couple of questions: 1) There is not enough room between the end of the new air horns and the inner fender to fit the air cleaner foam element into place against the backing plate, so it appears that I will have to remove the carburetors from the intake manifold, attach the air cleaner backing plates and air horns to the carburetors, attach the foam element to the backing plates, then reattach the carbs to the manifold. Is that correct? 2) On the factory air cleaner backing plate, there are 2 nipples to which attach hoses from the float bowl fuel overflows so gas does not fall down onto the exhaust manifold/headers. The ITG backing plates have no such nipples. I thought about running hoses to an overflow canister / container attached to the inner fender, but that's not very elegant. Any suggestions from someone who has or is using these air cleaners? Thanks.
  3. I am having problems with fuel pump pressure on my 240z. Can someone point out which is the best electric fuel pump for this stock carburetors? I was using a Carter P60504 and it only puts out 3 PSI. What will be the máximum PSI that both of these carbs will tolerate without overflooding the float valves. How much per carburetor?
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