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  1. J

    Injector Code Comparison

    I applaud the effort, but unfortunately very little of that really matters. What really matters with the injectors is the pop pressure (which can be measured and adjusted) and the size/shape of the pintle and nozzle, which is very difficult to quantify. Moreover, the interaction of the injector...
  2. J

    banks sidewinder rebuild?

    ~0.030" side to side play is normal. Axial play should be minimal. I have a low mileage Sidewinder turbo that would be a good doner for a center section swap if you wind up wanting to do that.
  3. J

    10.25 weight question

    I'm pretty sure the heaviest 10.25 axle rating is 7400#. Not clear exactly what you're trying to do - but you probably want to start with a truck that's rated for the weight you plan to haul. Putting heavier axles under a light truck *does not* mean any of the rest of the truck can handle...
  4. J

    Cheap Hitches, Big Loads, and Gravity

    Not entirely sure where you got 2.5 kips, I was just doing a straightforward f/a shear computation off the uts to come up with a ballpark failure load. Yes, fatigue and such plays in but still it's not going to decrease it to where anything less than a significant collision will likely cause...
  5. J

    Cheap Hitches, Big Loads, and Gravity

    1" threaded rod has a cross sectional area of around .65 in^2.... even low carbon steel has a tensile strength (UTS, ignoring YS for the moment) of around 60ksi, so around 40,000 lb tension or ~30,000 lb of shear force. Now, the tightening of the nut will put the stud under a fair amount of...
  6. J

    Cheap Hitches, Big Loads, and Gravity

    To the OP - what was the actual weight of that load? If you're going to the dump I'd assume you'd have a weight ticket. I'd be real curious to see what it was and what the tongue weight was if known. Also curious how much the truck squatted - I'd think it'd be pretty close to the bump stops. May...
  7. J

    Cheap Hitches, Big Loads, and Gravity

    With respect, I do not agree completely. The receiver and hitch should be engineered for sufficient strength for the load they're rated for when setup as designed - no need to add stuff to them, and could possibly make things worse if you're modifying things. If the hitch is a heat treated steel...
  8. J

    Cheap Hitches, Big Loads, and Gravity

    Excess tongue weight. The side member you can see shows a classic buckling failure, which is indicative of a high vertically downward load on the ball, possibly combined with high forward force, ie a hard braking w/o good trailer brakes or frontal collision. However, force forward on the hitch...
  9. J

    Turbo Intercooler Sizes/Upgrades

    It seemed to drop EGTs about 100* or so, maybe more I don't recall exactly. Haven't seen any sign of heat soaking, but I don't really have the instruments to really see anything - I want to put temp sensors on the water & air in/out pipes and really see what it does, but haven't yet. No idea...
  10. J

    Turbo Intercooler Sizes/Upgrades

    I was able to squeeze the intercooler between the engine and wheel well aft of the radiator - sort of where the vacuum pump is. I have pictures of it somewhere on here, don't remember exactly where. Mind you, I deleted the vacuum pump (hydroboost + electric pump for HVAC) so it might not fit...
  11. J

    Turbo Intercooler Sizes/Upgrades

    Sounds like the hypermax unit was plugged somehow - even a restrictive cooler should have had some boost. That reads to me as a plugged pipe somewhere in the system.
  12. J

    Turbo Intercooler Sizes/Upgrades

    I'm running a water to air setup that seems to work decently. 2-1/2" is what I'm using and it seems fine to me. The HX35 outlet is ~2-1/2. I think most original (banks, ATS, etc) turbos are ~2" outlet, but I'd still use 2-1/2. Easy to get a adapter silicone coupler. How did your IC setup...
  13. J

    TIMING SERVICE REGISTRY

    State: CA City: Monterrey Capability: Lumy Equipment: Snap-On MT-480 Contact: pm Cost: Donations
  14. J

    help me design my new electrical system

    Check out del city for parts & wire - they have a good selection of stuff and are decently priced. LCAM, going to disagree a bit - I wouldn't try to use relays for brake/turn as it's one more thing to go wrong and unneeded complexity IHMO. How many brake lights are you thinking of having...
  15. J

    Tach for my automatic

    Yep, learned the hard way. Come to think of it, I think I have a spare tach circuit card wandering around if you really need one.
  16. J

    Tach for my automatic

    85 should have the housing for the sensor and the wiring. To the best of my knowledge it's only 83 & early 84 that didn't. You'll also want the 'circuit card' (wiring film thing) off the back of the cluster since the non tach units don't have the leads for the tach. The wiring to the cluster...
  17. J

    downpipe material

    Go to the local exhaust/muffler shop and get some tubing from them. Stainless is good if you can get it/work it, but aluminized steel works too. Mine is steel and it's getting close to 10 years old without any signs of significant rusting. Now, I live in CA, so that helps.
  18. J

    bed modification for practicality.

    2x3x1/4" tubing weighs 5.4 lb/ft, 2x3x1/4 is 7.1 lb/ft. Even a basic grid in the bed is going to easily add 500 lb to your truck.... which is 500 lb you can't use to haul stuff, and have to cart around all the time. That's a pretty significant amount of weight to add, not to mention the several...
  19. J

    Yet another ZF-5 question

    At least through 97, yes. I think the ZF6 maybe is a different pattern? All the ZF5s are the same pattern - I have an s5-47 (later psd) on my truck and it fits just fine.
  20. J

    factory to hx

    Not sure. I do now that you mention it recall that there's a HY35 which is similar but has a smaller compressor (IIRC) and I think was used on automatics. There seems to be quite a bit of variety in what was used. I'd say that chances are good that any will work fine.
  21. J

    Pintle Free Injectors

    Just the part about not being able to do math.... :D
  22. J

    Pintle Free Injectors

    Not sure where you got the number there, but it a fair bit too big... 2000 rpm is 33.3 rev/sec, or 30 ms per revolution. (30 thousands of a second) That means that 1 degree of crank rotation is 83micro seconds (millionth of a second) So, if the fuel injection takes 1/1000 of a second, that's...
  23. J

    factory to hx

    I have posted a few threads - one I can think of is titled 'HX35 info' or something similar. Should be able to find it off that. My experience has been good with the unit I've got. Mine is off a 98 cummins IIRC. WG seems to be set about 19-20 lb which is where it was when I got it. Mine is...
  24. J

    How much CO2...?

    Why do you want to use CO2? I'd say to use the good old flapper valve setup to close off the intake somewhere. I don't think the CO2 idea is going to work reliably.... Concerns I have off the top of my head: 1) You're going to be pressurizing the intake pretty good, and likely causing a...
  25. J

    Yet another ZF-5 question

    You need the ZF flywheel. It looks like it will work, but the pilot on the zf is shorter so it doesn't engage the bearing completely, which is what causes excessive rollover noise. Not sure how much potential there is for real damage and how much is just obnoxious noise, but I wouldn't take the...
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