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About G-Duax

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    prickly in San Antonio

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  • Gender
    Not Telling
  • Location
    San Antonio, The Republic of Texas
  • Cars
    73 620 & 90 Toyota Cressida
  • Interests
    Karts, Import cars, Slot cars
  • Occupation
    Machinist - I make things you can't

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  1. G-Duax

    Recommended Killswitch

    Won't work..... I've seen people try this for decades, and there is always a way to bypass such add-ons. Some don't even bother, the just snatch it with a tow truck.
  2. I have been eyeing the Mustang-II front suspension mod kits offered by Speedway motors, as an alternate to the stock 620 front suspensions. This is a common up-grade to old school hot rods, like 32 fords, and 53 chevy trucks. You will loose the 6-bolt hubs, unless can come up with something that can be adapted, or just go to 5-lug rear axles form an old Cedric on the rear. Haven't tried that yet, as the cost of bringing a set over from Japan is rather expensive. Maybe just look at the Mustang-II power steering rack it's self. You will like the Watts link. My 620 absolutely lost the loose rear end after going to this. I mounted my Watts locker on the bottom of the diff, as that gives the lowest possible roll center.
  3. Also on the cut spring thing. Yes, as the coil gets shorter, it gets stiffer (higher spring rate), and because of this you should also go to stiffer shocks, as shocks should match what spring rate you are running. Otherwise the car will start the ghetto-mobile pogo-stick dance....
  4. You are comparing apples to oranges Mike, or more like comparing fresh fruit, to something that has been sitting in a trash dumpster to a week. Dumpster diving will most likely make you sick, but fresh fruit shouldn't. Your two examples come from poor maintenance. This GM conversion, the guy selling the control box states that the system can fail at any time. Besides, who in hell wants to keep reaching for a knob to adjust while driving ?
  5. From the eBay listing text: These steering columns can have two problems: It can be slightly softer to turn left than right (or the opposite). When you turn steering wheel, the steering system can turn off without explanation. The first would be annoying as hell, but the second is a big No Erucking Way, Jose !! Metric to US steering couplers are hard to find, and I think I tried both those above mentioned sources, they didn't have them. I did eventually find a source to install a Howe steering quickener into my Cressida. How does that GM unit install into a Datsun ? I think that if you are asking that question, there is a very good chance that you can't handle it.
  6. I'm running a Crane LS91, which is the same type of coil, and I have mine strait over from the distributor on the fender, near the top, next to the hood on my 620. But you didn't say what vehicle...
  7. Take the just the valves in question into an automotive machine shop, and have the ground, it will true them up. No need to replace them. Grinding, unlike lapping will bring the seat surface back concentric with the stems again. All valves can take a little bending, and survive. I once held a drag racer from California, who was in town for an IDRA national event get his Celica back on the track after he sheared a cam drive pin on one 2TG cam, and run all 4 valves off one bank into the pistons, and bent them. Ran back to my place, pulled the valves, put them in the lathe chuck, straitened them with a lead hammer to about .010" run-out, then threw them into my valve grinder, and made them perfect. Next day he was back running sub-9 second passes. Smokey Yunick straitened the valves in an Offy engine the night before the 500 by prying on them through the intake ports with a large screw driver. Typical charge for grinding a valve is just a few dollars per valve.
  8. Ha, I live in S. Texas, and thought that also. Then back in February, on my way home from work in the wee hours of the morning, temp about 30, after running 20 miles on Interstate-10 at about 4800 rpm, I let off the throttle for my exit, and nope, throttle wouldn't close ! Hit the ignition switch, and kicked it into neutral, coasted to the stop sign, then let engine heat thaw my carb out, and every thing was just fine. First time in 35 years down here that it happened, but being from Wisconsin, I knew what to do...
  9. I'd start with house keeping... Clean everything. Remove unused hoses, and use proper caps to plug off caps. While your at it, address any other issues, and look for signs of an ignition malfunction, and that includes all wires going to the coil. Mike is spot on inspecting the coil, I had Crane CDI coil on my Toyota, that decided to ark out through the side. Would have never found it if I didn't keep my engine bay spotless. It showed up as a faint white haze spot on the coil, and I instantly recognized it as an ark trace. The other thing to look at is fuel supply. A loss of volume, or pressure will cause high RPM cut out. So check your filter(s), and fuel pump. I experienced this after installing a cam, big valves, and port work, the Carter in-line pump just couldn't keep up, and the float bowl of my Weber would run dry, and the engine would start to sputter, and die out at the top of each gear. The way around that is to go to a larger inlet needle & seat. Both of my Webers came with 2.0 seats (the brass part that holds the needle). I reamed mine to 2.5mm, and the issue went away. Redline sells the larger sets. I don't recommend doing it yourself, if you don't have a machine shop, as you can easily screw it up.
  10. G-Duax

    Fuel pressure help

    Pulsations are because of mechanical fuel pump.... No way around it, because big diaphragm goes up & down once every 2 engine revolutions. Oil filled will do little. Pulsations will still kill the little brass gears inside of any gauge. Oil filled gauges are more for high frequency vibrations induced by the machinery your gauge is attached to, in this case, your truck. You need a ' gauge snubber '. Available at any industrial supply, or hydraulic dealer. (40 years of hydraulic/pneumatic back ground here)
  11. You will need thee LSD of course, with the correct splines for your axles. Those things come in several different spline counts. I have an R200 Nismo LSD sitting here that come all the way from Japan at my expense, that is for the big R34 GT-R splines. Unfortunately, it was supposed to be for something else, like a 29 spline S13, or a 30 spline S15. All I've ever used it for in the past 10 years is parts...... Funny, the plates in it were a perfect match for the H190 I have in my truck. Then you should have new seals, and a good selection of bearing shims so you can properly set gear mesh. Wait, you didn't know the bearings had to be re-shimmed ? Better plan on taking it to a dealer then to have it them set it up.
  12. Honda tried that to increase valve area, to get the benefits of a V8, while staying in the FIA regulation of a max of 4 cylinders. Surface area was actually more than a 4-cylinder of the same displacement, with the same stroke. They also had a prototype that had oval valves. But unfortunately was a complete failure on the track....I think the engineer in charge of that thing is either sweeping floors at the factory now, or committed seppuku.
  13. G-Duax

    521 speedogear

    eBay, maybe. I've seen new ones up there. Mike will have the color codes for the different tooth counts. I can also get them out of Japan, but they are not cheap.
  14. I fixed many VW crank case holes (when a connecting rod tried to escape, to run free among other road flotsam) with epoxy. Aluminum has to be 100% clean, and roughed up, and the epoxy has to be thick. But I like spending $2 to walk around a wrecking yard too.
  15. G-Duax

    cali smog

    I hear this a lot from people who really don't understand how engines work. Here is what happens. You take a restrictive stock exhaust system off, and replace it with a free flowing one. The engine breaths better due to less back pressure, and less exhaust mixing with the new incoming charge. This makes the new incoming charge to be lean, due to less exhaust gas, but more oxygen per charge in the mix for what the engine was tuned for. As far as leaks, I normally put that down to poor installation, as I have never had problems with PaceSetter, or any other tube header. And as far as cali smog inspections, well, you choose to live there....
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