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Stanley

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Stanley last won the day on October 28 2016

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About Stanley

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    Redondo beach
  • Occupation
    engineer

My Cars

  • About my Cars
    73 Z semi stock skyline head

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  1. Floats need to sit correctly in the float bowls, otherwise they can stick against the sides of the bowls. Adjusting (bending) the hinge tab and/or a light touch with sandpaper on the float will fix that. If the valve isn't new it could have some gunk in it - fix with carb cleaner. The other answers are also correct.
  2. After installing a modified 280 block with modified 280zx head & stage II cam in my 240Z, my AT modulator promptly blew out and started sucking ATF into the engine. Put a new modulator but it seems to have blown out as well. Maybe the the new engine is making too much vacuum for the flimsy modulators? Trans is 3N71B, stock 3-speed AT for 240Z, 280Z, and 280ZX, Maxima etc. AFAIK. Looked at Rock Auto, they have same (and some different) ones listed for the various models, from $11 to about $50. Two are listed for 280zx as "fully adjustable", one with a 910" diaphragm for non-turbo, and one with a .840 diaphragm for turbo. The same $11 non-adjustable Fram is listed for all years of 240Z, 280Z, and 280ZX, so I guess they're all swappable. I found this, not for a Nissan: "use a small slotted screwdriver to turn the adjuster that is located inside of the vacuum fitting. Turn clockwise for earlier shifting, counterclockwise for later shifting." I guess I need a tough adjustable modulator but guessing and following manufacturer's hype can lead to destruction. I'd like to have an idea what to do before I start "adjusting". Anybody know? Due to the headers it's not real easy to get at the modulator, so would like to get it about right first time.
  3. Whatever the future may bring, I've become more aware of changes in driving habits. Couple weeks ago I was behind a driver who was all over the road. When I was able to pass safely I saw her looking down at her phone. Last fall I was one of the first to stop at an accident where an SUV rolled on it's side and a woman in the other car was trapped inside. We pulled the SUV driver out, she said she was lost and looking a map on the screen. I've been seeing a lot more "failure to yield" in the last few years, when drivers making a left turn cut off approaching cars. I don't know but I suspect they've gotten used to following orders from their navigation systems and just turn when told to. Also, on a recent road trip to Arizona there were a lot of slow big rigs in the right hand lane. Often there would be line of cars in the left lane waiting to pass, and a driver would fly past in the right lane, get behind the truck, and then slip between the left lane cars and pass. So it's 80 mph and only about a car length between cars. One little mistake and it's a tragedy. And on a 6 hour trip they might only save about a minute doing that. I usually ended up passing them later, with the cruise set at 79 mph.
  4. https://www.newyorker.com/culture/annals-of-inquiry/the-fight-for-the-right-to-drive?utm_source=pocket-newtab
  5. After a few minutes of trying to balance a pencil on my finger and thinking about the boundary conditions, I gave up. After all it was beer time. But modeling the system in Matlab was required. I don't own Matlab but it's said to be a very powerful program. Maybe fluency in its use would be a big advantage in solving the problem.
  6. Don't see any RH or SB but this one in Riverside has a lot of needles. https://www.aptfast.com/ListItems.aspx?RootCat=SU%3A Needles&page=2&
  7. I think there might be another variable or two in play here that would explain why your results with the British needles were different from mine. Not at all sure but here's a couple possibilities. About three years ago I swapped my old nozzles for a couple of brand new ones. I compared the old and new ones. The old ones were worn - bigger diameter holes than new which would allow more gas to flow (the car ran OK with the old nozzles). Also, I didn't try the British needles with the larger engine. I guess more displacement would create more vacuum, pulling the piston and needle higher and so allowing it to run at idle. If those two theories get shot down (fire away, C.O. !) then I got nothing.
  8. How many turns down for the mix nuts with the SB's? I tried SM's for my modified 240z engine but found I had to drop the mix nuts a couple of extra turns to get it to idle, which made it way too rich at midrange, fouling the plugs. That's because the SM's (and other British needles that fit, as far as I know) are 0.099 at station 1, compared to 0.090 for the stock Hitachi needles, like N-27's. When I installed a modified 280/280zx engine, the first needles I tried were modified (richer at mid-range and top end) N-27's. Looks like my AFR numbers are about where the engine builder wants them so I guess I lucked out. Checked my book, it shows SB's same as SM's at the top two stations, then they start to lean out more than SM's like you said. Anyway, your AFR numbers look OK, so however it works, it works. I've read where someone planned to drill out the nozzles to use British needles. Have also read about pushing the needles up into at piston as far as they'll go which is about 1/8" or 1 station higher than FSM says to put them. But that would only get you to 0.095 at the top station (if my 1/8" measurement guess is correct), not .090.
  9. Not quite on topic, but my car was very hard to steer at low speed. The tires were low. Put some air today and now it's steering easy again.
  10. My A/F meter flips around when it's first started and the engine is cold. Don't know if it's because the sensor hasn't warmed up or if it's due to the mix being irregular because the intake runners haven't warmed up. Or maybe both. Once the engine has run about 15 seconds the meter is steady and the numbers on the gauge respond instantly with adjustment of the choke lever. Kind of handy (with the SU's) to avoid running too rich or lean at startup. Need to adjust the lever several times to keep AFR where I want it until it warms up. Noticed it also responds to stuff I don't think of as fuel. The AT modulator was bad, leaking ATF into the balance tube occasionally until I replaced it last month. I was taking a drive and saw the gauge suddenly drop to 10. Looked in the rearview and saw a cloud of blue smoke. Guess the engine had just sucked in a gob.
  11. Nice project. Do you need to calibrate depending on sensor distance from exhaust ports ?
  12. I want to put my A/F meter where the clock is, just by sticking it on the clock glass with velcro or dbl sided tape. But the knob is in the way and I can't see how to remove it. The clock doesn't work anyway.
  13. Do you have a points distributor? If so check dwell, condition of points cap and rotor. Also timing as above. Using premium gas right? Raising idle will usually make overrun worse. Car can't run right with fouled plugs. What carb needles? You need a synchrometer or flowmeter to do the carb tuneup per FSM or "quick and dirty" (or an expert's ear). I would change "occasionally" to "frequently". Hit linkage with carb cleaner and follow with lithium spray grease to fix. Maybe good to do that at least once a year. Car looks good BTW. Nismo headers wow, let's see them.
  14. I'll try that. Other problems now, computer related.
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