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About G-Duax

  • Rank
    prickly in San Antonio

Profile Information

  • 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. What I have seen over the years is that for every 10 people on a forum who say "Make them, I'll buy one", that maybe 1 will actually buy. People who have never made anything from a raw chunk of material just don't understand the work involved, including things like locating material, cutting tools needed, design time, including things that don't quite come out as planned, and having to start over, even when done on CAD. That's why commercial machine shops charge by the hour to prototype an item, and that gets expensive. I feel for you Mike. Thanks for the effort !
  2. G-Duax

    bed hydraulics

    Remember when SCCA had a road race class for mini trucks ? 1987 to 91. The Archer brothers were really competitive, one went on to race a Viper in some class, but the name hardly pops up any longer. A buddy of mine says the Lemons people are very lax on restrictions on trucks, just to draw some of them in. I want to....No I can't....But it would be fun.....But I have too many projects now - DAMIT !!
  3. G-Duax

    bed hydraulics

    I think he's talking 'low rider' type hydraulics where they not only do a normal dump, but tilt side to side, so they can put on a 'show'. OP, If you don't know anything about hydraulics, and don't have a good back ground in mechanical design, and fab skills, and don't have deep pockets for some low rider shop to do it for you, I suggest to let that idea go...
  4. I hate it when people want to clean out their garage or storage unit, but it's all or nothing.... Who thinks like that ??? Maybe they should just call the local scrap metal yard, they will take it all at once.
  5. G-Duax


    How much you want for it and can you ship it to Texas? (San Antonio)
  6. G-Duax

    cannon manifold 821

    Ah, 80 kph is 50 mph..... (49.7 actually). Do you have an actual tachometer ? My 620 with 4.62 gears, in 4th gear (1:1) is only turning 6000 rpm at 100 mph, so it's only turning 3000 rpm at 80 kph. Have you ever owned an Nissan L4 engine before ? That is not too high of rpm, in fact they like that type of rpm.
  7. My '73, for what it's worth...
  8. While trying to figure out how to not to sand blast the barrels, while stripping the centers, I got to wondering if there was actually a masking tape meant for the job. Did a search on google, and found that people were using Gorilla tape, or hull preservation tape. The gorilla stuff had an issue with leaving adhesive behind, so people were pre-masking them with painter's tape first. The hull tape didn't have that issue. So I bought a roll of "Dr. Shrink" 4" wide, and will give it a try. The stuff is 10 mil thick, so I'll see how it goes. I'll just buy a couple of bags of play sand, and do it in the yard, instead of my blast cabinet. Here is the tape on eBay: Hull preservation tape
  9. G-Duax

    KA with sidedrafts

    Like the distributor mount, except for a set screw to hold the position. Set screws going into aluminum is not the best idea, as it will continue chew up the distributor every time you want to adjust timing. I highly suggest picking up either nylon tipped set screws, or at minimum, flat point set screws in what ever thread he used. McMaster-Carr may have both. A pointed, or cup tip set screw will do the most damage. I may make one for mine, but use a clamp arrangement. Just another ear, slit, and a cross 5mm screw to squeeze it down on the distributor.
  10. Japan. $614 to my door. I may have bit off more than what time I have to refinish them though. Yes, they are 3 piece, but SSR welded the pieces together after they were bolted up, so sand blasting the centers will take a lot of masking to protect the lips. Figured some 1/8" sheet plastic to cover the large areas of the barrels, and some serious masking. Trouble is, they won't fit into my blast cabinet like the centers would have. Already bought new valve stems, and 120 stainless nuts, since the nuts were pretty pitted, although the bolts are still in great shape. Thinking about just throwing them up on Craig's list to get my money out of them, and then going some other direction.
  11. How deep is the dish on the SR pistons ? An actual picture of the top of them at an angle would be most welcome also. The pin height on an SR piston is 32mm, and am curious if I can turn a set into flat-tops with a 29mm pin height for an L18 build.
  12. G-Duax

    KA with sidedrafts

    The Toyota MR-S pump is a good choice4, as it's a stand-alone unit that all it needs is a speed sensor input to do digressive power. That is, and slow speed it is at full power, but as the vehicle speeds up, it progressively drops power. Don't use the MR2 pump, as it needs additional black boxes to be used.
  13. G-Duax

    KA with sidedrafts

    Hm, I wonder where that extra decimal point come from ? Good catch. You couldn't pull the head off, but I wouldn't give a dime for the head gasket holding....
  14. Without welding or cutting things....Yeah, grim is the word. But the center carrier should work if the '87 is a 4-cylinder, as they should both be H190s. Just pull the axles out far enough to disengage the diff, and take the drive shaft off, followed by the 10 nuts holding the carrier in the housing. Remember, if it is a different ratio, you will have to change the speed drive gear in the trans to get the speedo to read correctly. And you may have to change the input flange. Not sure what year they went to a larger flange. I have a 2006 H190 in my 620, and had to change the flange. Why are you wanting to do this ? Is the 620 gears shot ?
  15. G-Duax

    KA with sidedrafts

    Even with a tiny 75mm bore, and typical full throttle combustion chamber pressure of 1000 psi, you are looking at 70,000 lbs. of force per cylinder being retained by M10 bolts, that at their weakest point, are not 10mm dia.. but 8.5mm (root diameter of the thread). Can't count all 10 bolts since the front 2 bolts don't hardly contribute anything to seal the next 3 cylinders. So, with 150,000 psi steel, that gives you almost 53,000 lbs. holding force on a cylinder that can generate 70,000 psi of force. The only thing that is keeping head gaskets sealed is maybe a little safety factor in where bolt manufactures come up with their tensile strength numbers, and what little surrounding bolts contribute to sealing a cylinder 4" away from them. Add any pre-ignition pressure spikes, and you will have slight, momentary leakage. I've seen high speed photography of high output engines at full throttle, spewing combustion gas past the head gaskets, that after tear down showed little sign of the gasket failing, but under race conditions, will. What keeps head gaskets in normal, every day vehicles, is that under normal conditions, they are very seldom ever at full throttle. Guys playing with Japanese turbo engines are playing Russian roulette with head gaskets, some are going from 12mm bolts to 14mm studs, and swapping out head gaskets after a day at the track. I laugh when I see people throw a cheap turbo kit on a stock engine, because I know what's coming, seen it so many times over the years. Now, a stock L-series engine, with smallish carb, restrictive intake manifold, pissy little 8.5:1 compression ratio, and restrictive exhaust probably won't make 1000 psi in the cylinder, but when built for competition, with higher compression, good induction, and free flowing exhaust, it will. Seems like I found somewhere the tensile strength of the stock bolts. Went searching for those numbers after seeing the builders in Japan using commercial 12.9 bolts for mains & head applications, and realized why they were doing it. Did not find what the turbo-Z head bolt numbers are, but they are known to be stronger. It's a shame that so much info on these older engines is lost to time, and who knows what tricks were developed on cars like the turbo Z that Paul Newman drove. I bet there were lots of secrets that never left that shop.
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