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HybridZ

inline6

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Everything posted by inline6

  1. Good to hear. I'm glad we were able to help. No ATF, use motor oil instead, pistons have to move/float freely through their entire movement range, needles and nozzles need to be in good shape (not interfering with each other at all) and installed correctly, fuel levels need to be set right. From there, setting nozzle heights and syncing the two carbs with each other properly is about all that is left for good carb operation. Extend the exhaust past the rear apron, a touch past the bumper is even better. A lot of the exhaust fumes come in around the tail light gaskets. They do not seal the tail lights to the tail light panel 100% even when new, and if they are dry rotted, then even less so. Pull your tail lights and have a look. The hatch seal (main one) doesn't seal 100% either. The curvature of the hatch panel doesn't contact the hatch seal firmly across it's entire surface (on my car at least). You can check by getting in the hatch area and fitting a shim/piece of thick paper all the way around the opening - checking for places where you can slip it between the hatch and the seal. Replace that seal if it is not in good shape. Also, a lot of people cause the car to run rich by installing the needles to far into the piston. You have to set the needles using the method I described.
  2. Honestly, I think that guy has carb tops from different years or something. The vents tubes, comparing between the two tops, are completely different. My 4 screw SU's had float chamber tops that were the same. 5 Star Rising - ditch the ATF. See post 13 here.
  3. Maybe different for different years... Have a look at this: By the way 5 Star Rising, don't follow ZTherapy method of setting float level. Look at the thread in this link - especially post 28. I never had any problems setting the float levels following the factory workshop manual instructions. No gross jets... I used the same needle and seat for both the front and the rear carburetor. I don't recall the posts and pins holding the floats being different heights for front vs. back carb.
  4. There should only be one crush washer under the needle/seat assembly. You're rigging if you do otherwise. Your tab that touches the needle looks all bent - definitely wrong. I'm going to look for a pic that shows what it should look like. Take a look at these
  5. I just looked again at your pics. That is not a Z on the base of the needle. It is an N. That was followed by the number - most likely 27. Those are the right ones. You really don't want to have scarring at that point of the needle. You may want to polish them up with some 2000 grit sandpaper, or think about replacing them down the road. Also, when assembled can you lift the pistons to the roof with your fingers, hold them tight against the roof and let go of them both really quick... and see if the pistons drop both at the same rate, and if they clunk on the carb floors. They should drop at the same rate. And they both should clunk. If they don't you've likely got a bent needle which can keep the pistons from seating. That will cause a lean condition as well.
  6. Honestly, until you confirm the cam timing, and the distributor drive are installed correctly, doing other things that rely on those to be right are half efforts. Even with the remanufactured distributor, you should get the markings on the casting so it can be properly identified. Assumptions, such as that they sold you the right reman distributor for example, don't help solve your problem. Facts are better. You need to do what I outlined in my last post. I became an expert with my 4 bolt SU carbs - I ran them for something like 15 years. There is a list of things that need to be done right for those to be right. However, quite a few things can be wrong on them, and they still work reasonably well. Just looking at the needles visually isn't going to help you identify them. New old stock ones I bought for my car came with black "ink" N27 printed on the fat part of the shaft that goes inside the piston. Easy to rub off... and once it is gone, no way to identify them by looking at them - you have to measure their diameter at specified intervals along the needles length and compare to notes others (search the internet) have made in that same regard. You can find that info online. The "Z" is probably just what a previous owner wrote on them with marker - no bearing on whether those are actually z car needles, or which z car needles, obviously. A lot of people don't know how to set the needles in the pistons right. And getting the needles in the correct position is a crucial thing about the Z's SU carburetors. To start, you have to wind the nozzles all the way in, have the domes off. Grab a piston and have the needle set screw loose enough to slide the needle in and out of the hole easily. Then put the needles in the pistons so the fat base portion sticks out easily an 1/8th of an inch. Next, set the set screw so it is just tight enough to keep so that the needles do not move on their own, but can move easily if pushed upon. Test this. The needles should move easily if you push or pull them in and out, but they should not move if you hold the piston vertically and shake it back and forth. Set the needle again so the base is proud of the piston bottom (both the channel and the bottom of the piston). Then set the pistons in the carb bodies making sure not to bump the needles as you align them to go into the nozzles. When you set the piston down all of the way, the ridge on the fat base of the needle will contact the nozzle - and the needle will be pushed up into the piston. This sets a "touching" or no gap fit between the shank of the needle and the nozzle top surface. Remove the piston carefully and tighten the needle set screw. When unscrew the nozzles to their initial settings per the manual, you will have the correct gap between the top of the nozzle and the base of the needle. The needles are now at the correct height. Other things: Don't bother with ATF in the piston tubes. Just use standard 10W30 motor oil. I tried ATF and it didn't work as well. There are low and high markings on the screw in "dip" sticks. Set them both to full when the sticks are threaded all the way in - don't go over. I used a small bottle (like air tool oil) which allowed me to add single drops of oil at at time - as necessary to get the level set precisely. If you don't have a carburetor synchronizer tool, buy one. You need to get the air coming into each carb to be the same amount. This is done at two places: at idle, and "off idle". Until you set this correctly - the front three and back three pistons will try to operate like two different engines. Obviously, not a good idea - not smooth. With these things and those of my prior post - if you do them and can supply specifics back, maybe the solution to your problem(s) won't be far off.
  7. What distributor are you using (get the letters and numbers off of the casting)? You need this in order to know what initial timing should be as different distributors require different settings. Previous owner(s) could have changed it. You said you've set timing many times. What did you set it at - initial setting in BTDC (Before Top Dead Center) degrees? Have you watched the timing change as you rev it up? Are you able to see the timing advance working? There is supposed to be both a mechanical advance (accomplished with fly weight) and a vacuum advance. Confirm that when you rev the engine up from idle that the ignition timing changes... (it should increase). What is the total degrees it advances to by, let's say 3500 RPM? It should be at least in the 30 to 36 degree territory. I understand that there may not be marks going that high. However, you can estimate by adding some paint marks on your pulley based on the distance between the existing ones. Paint additional marks as necessary so you can see the total advance that is occurring. Have you checked that the cam timing is set properly? Take valve cover off (and spark plugs out) and rotate engine by hand/socket until a bright (or dark) link matches the mark on cam gear and then align cam gear to mark on front cam plate. Be aware that there are two links on the chain that are notably different from the rest, so you may have to do this for both of them. After many revolutions, you will see a marked link will line up with the mark on the cam gear. When you further align the cam gear with the mark on the cam plate, you should be able to look at the timing pointer and its relation to the crank pulley markings to verify cam timing is set right. If the pointer is not pointing at the TDC mark, then keep rotating until the next mark aligns with the cam gear mark - align cam gear with plate and check pointer at crank gear. If neither of these line everything up, your cam timing is off. Also, you should check that the distributor drive spindle is correctly installed - you can remove the distributor and view it compared to reference pics of where it is supposed to be at top dead center (look on this forum or google images). You need to know that all of the mechanical alignments are correct before you can conclude that your ignition timing setting efforts are being accurately performed. Until you knock these things out as possibilities for the problem(s), you have too many variables to troubleshoot systematically.
  8. HybridZ may be shutting down.

    Dan, I didn't read all the posts from folks - I just scanned them really quick. But, I can tell from the response, that there is plenty of interest. I have some suggestions for you. Instead of having a "donations" button in the header, you need a more prominent as well as additional buttons (call to action) that say "donate". But more importantly, I suggest you run an annual "membership" drive like NPR does. Set a monetary goal based on the costs and your desired profit and let everyone know what that amount is at the beginning of the drive. Target it to run about a week, and end it if you hit the goal before the week is over. Do a takeover of the home page if possible and remind people in posts, on section pages, during login, etc. (I don't know what controls you have on content locations of the site) to donate during the annual membership drive. You could also create an additional tier - sustaining members or something similar. Get folks to set up automatic contributions of a certain amount a month to qualify. This provides a more constant revenue stream than otherwise. Garrett
  9. I'm in contact with Moroso about making a custom dry sump oil pan. They want a block for fitment testing. Any members live nearby that could sell me a block? And, if I could pay you to drop it off, let me know. I realize this may be a far fetched request, but I thought I'd run it by hybridz'ers and see. I just need a junk block... L-24, L-26, or L-28, anything L in a six cylinder - doesn't matter which. Unless someone here can help, I'll have to source a block (maybe not so nearby) and have it shipped. I'll update this thread with another address if this one isn't where the block needs to go. If anyone else is interested in information about the dry sump pan, shoot me a pm. If there is interest, I'll set up a group buy thread. Moroso Performance Products 80 Carter Drive Guilford, CT 06437
  10. I am in Marietta, GA. I'm inquiring to see if anyone nearby to Moroso Performance Products would be able to help. Thanks for responding though. 2 hours away isn't going to be close enough. If they were 5 miles away from you, I'd try to get you to help!
  11. Mikuni 44PPH Stock Air Horn

    Sorry I forgot about this for a while. I just took a look and I don't have any extras like you need.
  12. Maybe PM me the pricing you'd like to get for the block, and for delivery? That address is the correct one. I heard back from Moroso today, and they said the cost of the aluminum dry sump pan would probably run $700-$800. Not bad at all.
  13. I ruined a race prepped motor at Road Atlanta (first track event for the engine) because a rod bearing and rod let go. I was running a Nissan Comp pan with something like 8 qt capacity. Member Clarkspeed posted that he has seen oil pressure drop at that track in my thread. Here is the relevant post from that thread. I am looking into having Moroso make a custom dry sump pan. Canton wasn't willing to make one.
  14. Mikuni 44PPH Stock Air Horn

    I believe I have some extras. Let me take a look when I get back home from the Thanksgiving weekend.
  15. P90 head

    I've got a NOS P90A head. Take a look to confirm, but I am fairly certain it is identical to a P90 as long as you use the non-hydraulic rocker pivot towers. This video shows how to convert to non-hydraulic type. Let me know if you are interested.
  16. So, I was going to try working on jetting of the carbs today. But, unlike the past several weekends, when I went to start the engine cold, it didn't fire. No attempt at trying to fire... I went inside to retrieve the Crane HI6 documentation and see what I could find out. There is a single red led. When I turn the ignition on, it lights up solid. Using the troubleshooting part of the manual, I determine that no fault codes are triggering. I check for spark using my timing light. I get none. The HI6 manual says to crank the engine over and check to see that the led blinks. It just dims a bit when attempting to start but doesn't blink. I check power (red wire) and ground (black wire) to the optical pickup. I confirm power and ground. So... I am thinking the problem is the optical pickup. I read where if the white wire it put to ground, it will trigger the coil. I switch my timing light to the high tension lead from the coil to the center of the distributor cap. I disconnect the optical pickup at it's harness connection - wires (red, black, white) go from this connection to the HI6 control box. I pull the trigger on my timing light and ground the white wire. The timing light flashes, and the led on the HI6 control box goes out. I remove the slotted disk from the distributor shaft. I reconnect the optical pickup at its harness. I hold the disk in one hand and the pickup in the other and simulate the disc rotating within the pickup beam. The light on the HI6 control box stays solid - it doesn't blink like the documentation says it should when cranking. So, the pickup just "went bad", right? Am I supposed to actually see a light beam when the pickup is powered up? Because I don't.
  17. Ok, it is time to start an engine build thread for my next engine. My last engine blew up spectacularly at Road Atlanta. Very disappointing. This one will be off the well beaten path, so there will be risks. So, here we go... Block work is stalled for now, but the N42 head is getting some attention. Per the Frank Honsowetz book, the cylinder head was bolted upside down on a block with a spacer to pre-load (bend) the head. The spacer used was 0.040". The welding is not done - this is just the start - welding rod was 40/43 I think. I will correct that if I find out differently. A few pics: Engine block will be a LD28, either a specially sourced V57 casting (one Hybrid Z member claims he has one that took an 89 mm bore and left 0.120" or more of cylinder wall), or a one off, custom liner design will be utilized. Garrett
  18. 3.4 - 3.5 Liter Engine Build Thread

    Bryan will need to come up with a plan. My understanding is that the furnace brazing process heats the entire block to a specific temperature and that the brazing material, wherever it has been applied, will flow. We have discussed creating "stepped" liners. These would have machined steps where they seat in both the top and bottom decks. For the brazing, there is an ideal fit - the liners cannot be too tight or too loose. And of course the entire block will have to be remachined after the furnace...
  19. 240z Jute Pad

    Here is what I have: I had two complete, but I used one half of one of these. These are original nissan parts, but they may be a supercession of the original mats and not match 100%. My car never came with factory jute on the floors, so I don't know. Here is a link to a dealer: Let me know if you are interested in these.
  20. 3.4 - 3.5 Liter Engine Build Thread

    I have an Electromotive Tec3r that I am planning to use. My plans are for a normally aspirated engine with a redline of 8000 to 8500. We'll have to see what the head will flow, but I'd like to see 400 hp. I am not well versed in fuel injection yet, but I think single injectors should be fine for my application. If we can find someone to do the block prep and furnace brazing work, I would think they would be more willing to do two than just one.
  21. 3.4 - 3.5 Liter Engine Build Thread

    Lots of research and planning but not terribly far into the execution. I've settled on an N42 head which has had all of valve seats removed and it has had the chambers welded up. There is a lot more work to do on the head. We are working now to determine what to do for the valve train. We're wanting to go with valves with 7 mm stems and beehive springs. Right now, we're researching what spring retainers will work with the nissan keepers (collets). We're looking at machining the diameter down on some of the chrome-moly Schneider ones. We've got the LD28 block bored to 89 mm, but have to figure out how to proceed with liner design and have yet to source someone to make the liners and someone who can do the furnace brazing operation. We also plan to do Kolene® Kastech® Electrolytic to the block before brazing the liners into place. The next step Bryan will do is exploratory surgery on the bores of the LD28 to learn what we can about the bottom and top decks. I am not terribly concerned about pace of this project as we are building a 3.0 liter to replace the engine that was in the car for now. The head for that engine is only needing minor work. And the N42 block we are using for that engine has had all of the boring and other necessary machine work completed. I hope to have that engine in the car in March or April. Garrett
  22. 240z Jute Pad

    I believe I have some of the factory stuff... nos. Let me get a pic and get back to you.
  23. New Tillet B1 Seats

    Yay! My new seats arrived.
  24. New Tillet B1 Seats

    A perfect fit for me - 5' 9.5" and 195 lb with 34 inch waist. Very comfortable - seems like they were probably made by creating some molds from form fitting foam. With L shaped mounting brackets, they weigh 9.2 lbs as best as my scale will measure. Seats by themselves are just under 7 lbs. I also got the fabric/fiberglass inserts you see in one pic and some sliders. More weight - but these aren't for a competition car.
  25. 3.4 - 3.5 Liter Engine Build Thread

    We'll need to go bigger with the diesel block, yes. We didn't want the guy doing the boring to do more without Bryan (my engine builder) being there... and timing didn't work out right. The guy that did the boring took more than 8 months to get to it, so we were happy just to get this far. Bryan will do some manual cutting and examination to see exactly what we have to work with - the lower and upper decks. Liners will be custom designed, and may include a step, so we are wanting to move slowly rather than bore out another .120" and just go with what is left. The N42 will be run as is (after finish honing). After sonic testing, we offset bored three of the cylinders - (4, 5, and 6) .010" for wall thickness reasons leaving the minimal thickness (one spot in cylinder 4) at .170". It seems this N42 would be good for 90 mm... if .150" walls would be sufficient for normal aspiration. The N42 engine will be the temporary replacement in the car until the 3.5 L engine build has been completed.
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