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Crashtd420

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Everything posted by Crashtd420

  1. Well interesting ride home.... Lowered the timing about 3 degree up the whole curve ..... getting on the highway i stayed in the 3rd gear and ran the rpms up.. I varied the throttle a bit, a couple wot hits when I could, then just cruised and then around town a bit, ran great, so far no miss, but I'm not saying I solved it, because that will just jinx me..... I found this graph which puts a visual to things..... I did notice a slight increase in the running temp, not much, usually the needle pointed slight left of center, now it's slightly right of center..... (half the needle is pointing towards the center gauge mark)..... again not a concerning increase.... I always thought lowering timing would decrease power and increasing timing would make more power so with that logic I turned up the timing but I dont think that's the case.. maybe it's true on efi because you can change the fuel and the timing ... With the carburetor it seems to be more about finding the sweet spot of your engine configuration..... and it seems mine might want a little less timing... Speedometer cable on the way....
  2. I'll try.... but it never seems to happen when I have time to stop.... I'm usually on my way to work or to pick my kid up..... I did increase timing last year but I dont remember when in relation to when the first miss happened... so I'm gonna dial back the timing a little and see what happens..... If it does happen again hopefully i am in a position to kill the motor and check the plugs.....
  3. Ok I half way understand what your saying .... this is definitely where I lack the knowledge.... Since your comment I found a couple articles supporting and explaining more about what you said.... It's starting to make some sense..... Usually the miss happens when the distributor is at full advance and around 3000 rpm or more.... never really at idle... So should I lower both my idle and full advance....? Currently 15 and 32.... Maybe drop to 12 and 28? Also the curve is kind of a straight line to full advance , should I alter that at all? I can move the rpm around and change how that line would look....
  4. Got lucky rain not coming till later tonight so I got to drive the datsun.... And as I'm heading to work I noticed I no longer had a working speedometer.... Cable broke under the truck, that was just a matter of time anyhow, it was never in the best shape and was probably one of the oldest wear items on my truck... Guess I'll get that on order today.....
  5. I really need to install those door seals.....
  6. Atleast I'm driving it to figure things out.... I've been able to get back to daily driving it.... 3 days this week.... rain coming back but weekend and next week looks good....
  7. It's usually such a brief event I dont know if it would actually show something.... i am running an air/fuel gauge and wideband o2 sensor and since I've been playing with the carburator I keep an eye on it....
  8. If my motor was stock I would agree but it's far from stock....
  9. In my state the wont let you rent a tow dolly unless the vehicle being towed is registered... And I found the same thing full trailer is definitely safer was only a few bucks more.....
  10. So as I was waiting to pick my son up a school I was looking at the app for my distributor timing, well I guess the changes didnt save... So i moved the rpms and advance around a little and saved it, apparently you actually have to write it back to the distributor for it to save correctly.... Any how this is what I came up with this..... sounded good no pinging, not like I know what it sounds like but I didnt hear anything wierd.... And for reference this is the vacuum advance I can edit..... totally clueless if i can use this to my benefit....
  11. I agree on the timing not wanting to go past 34..... As far as the gap on the plug I'm after info more directly related to my piston choice..... I already ran the b6es-11 which are a 42 gap successfully, I only changed back to the standard ones because of things I was reading about the flame travel and other stuff I really dont know much about.....
  12. Ok with all that said if anyone has any insight on which spark plug gap to go with that would be appreciated? Currently I have the standard gap because I was reading somewhere about dome pistons liking a smaller gap but who knows if its true or not.... And the timing.... am I on the right track? It's a nice visual curve from 15 to 34.... I've also been wondering if I should try to program some vacuum advance? Usually the miss happens when I'm cruising on the highway, barely on the throttle..... I do monitor manifold vacuum and I can program a vacuum advance into the distributor but I dont know what to actually input for that.... Atleast today it has been running good, seems to like the extra timing I gave it....
  13. Well fuck..... the other day I got a damn misfire again..... only once but I still dont like it.... Last year after putting about 1500 miles on the motor this started to happen randomly.... I did new low resistance wires and a quality old stock bosche 1.8 ohm coil and non resistor plugs.. Per recommendation of distributorguy... It have tried the standard b6es, b6es with a 36 gap and b6es-11 ..... Every time it would happen I changed the cap and it instantly goes away but not for to long.... so over the winter I picked up 2 new rotors from 123 Ignition and then I cross referenced the cap to an older BMW... and got a cap from the BMW dealer.... even after all that I got that miss fire.... So yesterday I polished the top of the rotor where the pin from the cap touches, but I'm not convinced that's the issue..... but it hasn't happened again... I also yesterday I went up 1 on the idle jet, and at lunch i checked my plugs and they look perfect.. right color across all 4 and nothing funky looking..... So I started thinking about timing.... I have an L16 with a single sidedraft setup and I'm running higher compression with dome pistons, I also have a w53 closed chamber head on the motor.... I have heard webers like a little more timing and have read similar things about dome pistons, but I'm not sure what I can get away with.... Since I have a 123 ignition distributor I was able to reduce the full advance rpm to 3000 from 3400, and brought the total timing up to 34, idle is 15.....
  14. Wouldnt be the first time some one has tried to tune to a vacuum leak.... Start from square one, Make sure you idle and air screws are set right and timing is good..... Has the carb been cleaned at all? If not check that too.... may just have a clogged idle jet....
  15. Crashtd420

    521 speedogear

    Those are for the long tail 71b they are shorter.... wont work.... I searched before trying to correct my speedometer... everyone has the shorter one..... we need the longer one..... And yes go right to the nissan dealer, if your lucky they will order It and you can bring yours in to compare the old to new before you have to buy it....
  16. Crashtd420

    521 speedogear

    These would be correct for a long tail 71b and probably the 71c..... Colors vs gear ratios are probably universal for the datsun/nissan.... But even that is confusing to me.... In my truck the black 17 tooth was 10% off in the 4 spd and almost 30% off in the 5 spd...
  17. Crashtd420

    521 speedogear

    So I'm up to about 80% sure I'm right that the part number I posted would work.... This is a pic of the speedo assemblies I have... the yellow came out of my 63 series 4spd from a 521 and the black one came out of the stumpy 71b from a 720. I know the short tail 71b came in the 84 to 86 720, but I dont know if they used the long tail also in those years which would be a different speedo drive... Greaser2 maybe take the part number and info I posted and see if the local dealer will order it ...... If it happens to be the sleeve and gear I would compare them. Refer back to Mike's post about things being offset. You may have to remove the gear and install it in the sleeve the came out of your transmission..... I had to cut a retaining notch at 180 degrees for it to work but length was correct.. that why I say use your sleeve..
  18. I'm coming around to leaving the lip alone.... right now that part of the rim looks pretty good it has that brushes aluminum look..... With the center being completely solid it does seem to be too much black.... Again why I wanna try it before I commit to powdercoaitng.....
  19. I'll visit the rims again soon.... I definitely have a better idea of what it could look like.... I'll probably play with the look on the truck with that plastidip paint so I can really decide how I'll want them powder coated...... Car show was supposed to be today but got canceled due to weather... Atleast I got all the new lug nuts installed and was able to take it for a drive to breakfast with the wife.... and the speedometer is back to normal with the ratio adaptor....
  20. You need to get the belt on first then bolt up the alternator up.... I had to do that upgrading my 521 alternator....
  21. Crashtd420

    521 speedogear

    Mike what year 720 had the stumpy 71b transmission? 1984 right? Because I am using the same speedometer drive in my stumpy 5spd 71b as I was in my 63 series 4spd.... so in theory would this part work? Says it fits the 84 to 86..... I'm cautious to suggest this dont wanna waste someone's money if I am wrong... I know all other 71b transmission use a shorter speedo pinion but look the same so verify what your buying....
  22. Crashtd420

    521 speedogear

    Here is a question is you speedometer correct or was it ? I have a black one but it's what I run in my truck, so sorry I dont wanna give up my spare.... I have a yellow 16 tooth I would give up, but if you need the black one that doesnt really help....
  23. I would 2nd the idea of replacing the 56mm instead of going to the 62.... But just incase you have to , I know you said you had problems finding the part number for the bearing...... This is it.... I did a front case swap to put a stumpy 71b behind my l series motor, so I had to switch to the 56mm to fit the case.... I have the other bearing numbers written down some where if you need any of those.... And I dont know if you did or not but take the tail housing off too and give the internals a good look..... i tried to skip that and I'm glad I didn't, I found the center bearing ready to fall apart.... plus u need to seal it all up again anyhow and when taking the front case off you probably broke the seal to the tail housing.....
  24. Crashtd420

    521 speedogear

    Assuming from the 4spd? What color is that one? Be careful when looking for a new one they come in 2 different lengths....
  25. I have zero luck with that stuff.... my wife never tells me her inspection sticker expired till all of a sudden I'm driving it and I notice..... Last time I finally had to make my wife drive my Chevy so I could get her a sticker... every day was a different reason she couldnt get there in time.... So I drove it to work so I could get the sticker on my way home... Wouldn't you know as I'm driving there, only about 1 mile away on the highway.... and what comes up and paces me on my left quater, and then behind me.... yup a state trooper.... I was sure I was gonna get pulled over, and he just gets off on the next exit....
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