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Mark Maras

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Everything posted by Mark Maras

  1. Mark Maras
    How long does it idle before fouling a plug? Assuming (correct me if I'm wrong) it starts to run on seven cylinders, will the plug clean up if you run the engine at high revs (Italian tune-up) for a while?
  2. Mark Maras
    I don't know where the oil is coming from but like C.O. I don't think it's coming from the carb reservoir. Ztherapy has an excellent video on SU carbs. It describes their function in detail and has many tests to ensure the carbs are working properly. With that thought in mind, you might give Steve at Ztherapy a call and ask him about the oil problem.
  3. Mark Maras
    The studs in the pics don't look like they're parallel with each other nor does one of the studs look like it's installed 90 degrees to the hub. I agree with Charles, put a nut on the offending studs and tap them.
  4. Mark Maras
    With the engine off, lift both carb pistons to the top. There should be considerable resistance in both. Then let them drop. They should drop at close to the same speed and hit the carb bridge with an audible clunk.
  5. Mark Maras
    How often do you have to add oil to the carbs?
  6. Mark Maras
    Tank venting is a possible cause. Do you know if it's running rich or lean when it's acting up? I always checked mixture problems with the choke first. Ease it on during the problem. If the problem improves or goes away, it is running lean.
  7. Mark Maras
    Can we all agree it was a very loose North American term that implied nothing more than a hatch vent move? Nothing will be gained by making a mountain out of a molehill.
  8. Mark Maras
    Perhaps we could all agree to disagree on the subject of the Z series question. Knowing that there were improvements throughout the model years I will continue to describe the difference between Series I and II 240 Z as the hatch vents move to the C-pillars. I believe that was all it was meant to describe (in the USA) originally.
  9. Mark Maras
    By now, we all know Nissan never had a series I and II 240 Z in America. However, it is a description that works (in America) for determining if it is an early or late model 240. Just to stir the fire a bit more the description also works for 260s and 280s due to the mid-year changes, but only in America as far as I know.
  10. Mark Maras
    Perhaps a mod to richen the mixture during acceleration? I would think a heavier spring would do the same thing.
  11. Mark Maras
    If the problem started with a new pump I'd run a fuel pump pressure and volume test. Last year there was quite a bit of discussion about new mechanical pumps not working properly.
  12. Mark Maras
    Over 20 years of daily driving my 71 (mechanical pump), I never once saw my firewall-mounted filter anywhere near full. It drove me nuts for a few years but I never had any fuel starvation problems with a half-full filter, so I gave up worrying about it. Describe the stalling issue.
  13. Mark Maras
    It appears that a company called Buc-ees in and around Angleton, Texas sells ethanol-free fuel. A bit of a drive but I'd do it.
  14. Mark Maras
    Would it be safe to use a few drops of muriatic acid to eat the rust?
  15. Mark Maras
    Hmm. That shaker siphon system looks interesting. I may have to try a PVC valve in my siphon hose.
  16. Mark Maras
    Looking for a part #, I found this. 40300N3200. It appears to be a Nissan wheel. Arguably a one-year-only, 77 Black Pearl Edition wheel. That info came from an old Ratson thread. Does anyone know if the Black Pearl Edition came with gold wheels? None of the 77 Black Pearl Z Images Google offers have gold wheels like yours.
  17. Mark Maras
    I learned my lesson after many mouthfuls of fuel. Now I use a longer hose.
  18. Mark Maras
    Dry ice is the answer. Pour some into the tank and wait for the CO2 fog to come out the top. I watched (from a distance) when a crew used this method to cut (with a torch) into an underground gas tank they had pulled up onto the surface.
  19. Mark Maras
    1st gen had the antenna switch on the right side of the radio like the one pictured but they were AM radios.
  20. Mark Maras
    Odd. I remember you using your leg too.
  21. Mark Maras
    I'm assuming you have 4 screw, round-top carbs. In the past, I removed the float chamber lids and used a 9/16" drill bit or a piece of cardboard cut to 9/16" to set the float height. The floats don't have to be exact, just close. There are more precise methods but this primitive method worked for me for over twenty years.
  22. Mark Maras
    Before you change to SM needles, check the float levels. The symptoms sound like low fuel levels in the bowls to me. The float levels are the primary mixture adjustment. The nozzles are the fine-tuned adjustment. @siteunseen I remember you altering the ramp angle on the float tang. Could that be the problem here?
  23. Mark Maras
    If they still made affordable cars that are fun to drive (Miata for example), young people would learn to drive well and love it. Sadly, our oldest son and our daughter both started with a Camry and a Corolla. They still drive boring cars. The good news? I came to my senses and started our youngest son with an 81 RX7. He likes fun, fast, small cars to this day, and loves to drive.
  24. Mark Maras
    I'd mark a ring gear tooth and the input flange. Then count the number of flange turns it takes to turn the ring gear one full turn.
  25. Mark Maras
    Try 0000 steel wool on the water spots.
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