Atomic Posted August 14, 2021 Author Report Share Posted August 14, 2021 On 8/11/2021 at 10:46 PM, datzenmike said: The Tut tut tut tut tut when revving is by the sound of it, a non functioning cylinder. Waiting for the results of the custom oil pump. I think it will be boss!!! Very nice work BTW 18 hours ago, slowlearner said: It runs! Great work! Sounds to me like it could be missing 2 cylinders actually. Keep at it. Check your ignition and injectors and off you go. 🙂 I actually pulled off the spark plugs, cleaned them and then ran the engine. Looks like cylinder 1 and 3 are not getting enough fuel. So fuel problem, need new injectors. 1 Quote Link to comment
afracer Posted August 30, 2021 Report Share Posted August 30, 2021 I would NOT rev or even run the engine long until your injectors are figured out and it's firing properly on all cylinders. Mismatched cylinder temperatures due to no fuel on some but fuel in others can warp the head and/or blow the head gasket. Quote Link to comment
bilzbobaggins Posted September 6, 2023 Report Share Posted September 6, 2023 One of my fav all time reads, wish there was some updates. 2 Quote Link to comment
Atomic Posted April 24 Author Report Share Posted April 24 (edited) Who am I, what have I been doing! Definitely not my Datsun! I have had a lot of stuff going on in my life and I hope to bring back the project from the brink of death. I have things coming up soon so it will probably take me to 2025 to really get into the project again. Anyways, I just wanted to know that this project is still in my warm garage and is currently waiting for new set of fuel injectors and a tune up. From last time, I still have had the problem with the oil pressure once the engine warms up. I wonder if it is due to the size of the oil line orifice for the turbo. AND/OR the crappy injectors I have currently as the motor goes with 2 cylinders. Cylinders number 1 and 3 currently won't get fuel. Aaanyways, updates maybe towards the summer..? Edited April 24 by Atomic 3 Quote Link to comment
datzenmike Posted April 24 Report Share Posted April 24 Check on line for info on a restricter for the oil line to the turbo. I don't think they need that much. There is an article in Club 1200 on modifying an L series oil pump to fit the A series to provide a higher volume output. Someone on here was doing it. I lost track. Quote Link to comment
Stoffregen Motorsports Posted April 24 Report Share Posted April 24 -3 AN is usually big enough. The turbo drain needs to be huge though. Quote Link to comment
Atomic Posted April 24 Author Report Share Posted April 24 1 hour ago, datzenmike said: Check on line for info on a restricter for the oil line to the turbo. I don't think they need that much. There is an article in Club 1200 on modifying an L series oil pump to fit the A series to provide a higher volume output. Someone on here was doing it. I lost track. The original modification is linked in this thread back some pages. + I made the adapter plate and all the stuff, but couldn't get pressure with that one sadly. I need to spend some time investigating what was wrong with the mod I did. So now I'm rocking with new repro pump there. Quote Link to comment
Atomic Posted April 24 Author Report Share Posted April 24 (edited) 1 hour ago, Stoffregen Motorsports said: -3 AN is usually big enough. The turbo drain needs to be huge though. The inlet restrictor currently has ~ 4 mm hole, the drain is about ~ 22 mm to the sump over the nominal oil level leaving with good angle from the turbo. Also the turbo is a journal bearing one. Although I suspect it's just that my 2 cylinders are missing for now and the rpm's are not that steady on idle so I don't get good lubrication from the pump. I'm barely hanging on 14 psi on 2 cylinder idle atm when motor is at operating temperature. Edited April 24 by Atomic Quote Link to comment
datzenmike Posted April 24 Report Share Posted April 24 Oil delivery is by RPMs (not working cylinders) so it should be 20 or better at 700. Rev it to 2000 it should easily reach the relief spring pressure of 50-60 PSI. 14s ok for idle as the engine is only making a couple of HP to spin the internals but revved up it should be much more. That 4mm is 0.160" that's huge. On an L head the oil jet is less than half that and it lubricates 8 cam lobes and four cam bearings with enough left over to squirt oil on the chain. On a turbo I assume it more to take away heat. Quote Link to comment
Atomic Posted April 25 Author Report Share Posted April 25 11 hours ago, datzenmike said: Oil delivery is by RPMs (not working cylinders) so it should be 20 or better at 700. Rev it to 2000 it should easily reach the relief spring pressure of 50-60 PSI. 14s ok for idle as the engine is only making a couple of HP to spin the internals but revved up it should be much more. That 4mm is 0.160" that's huge. On an L head the oil jet is less than half that and it lubricates 8 cam lobes and four cam bearings with enough left over to squirt oil on the chain. On a turbo I assume it more to take away heat. Yes, sorry I was a bit unclear with my thought. I was thinking that if the engine runs only with two cylinders, the RPM cycle would be uneven and cause the drop on mechanical oil pump. And what comes to the oil feed I need to think about a little bit more. Anyways, I will try to move one problem at the time, first comes to get all cylinders working. Quote Link to comment
Atomic Posted April 25 Author Report Share Posted April 25 (edited) Also these guys seem to sell the oil pump kit that I also machined to increase the volume: https://www.nengun.com/matsuoka-engineering/large-capacity-oil-pump Edited April 25 by Atomic 1 Quote Link to comment
Atomic Posted April 28 Author Report Share Posted April 28 (edited) In this episode of failures: Who put goop into my engine? The car was running ish okay when I started it up with the new injectors (keyword), but then it stalled and just wouldn't run anymore. Well I checked the plugs and they were completely gooped up and then I took the intake manifold off to see what was up. There was this huge piling of material inside the walls. First it looked like it could be from the 3D printed intake manifold. But then again, there wouldn't be any material left if that would have been the case. Also the powder was grey, so it must have been from somewhere else. Needless to say, everything was full of goop! Nice thing was that the engine fluids were nicely separated with the fire rings and copper head gasket! The goop had a silky texture and it dissolved as soon as you rubber your fingers together. Well if the goop wasn't from intake manifold, could it be from the fuel system? Oh yes... Yes it could... Fingerlicking good, similar very fine powder! Took the whole engine out to inspect everything else, the goop was on top of each cylinder and the cylinder walls, eww. The conrod bearings look okay ish? I hope that I could survive the engine rebuild with just new bearings, I hope I don't have to redo the surfaces Cylinder walls still had the X hatch pattern beside the darker coloration directly at 90 and 180 degree positions of the cylinders, need to check with the machine shop if they need to redo these? TLDR: I think my fuel tank which had POR 2K treatment done to it failed to me and pushed goop through even the filter systems via fuel channels, this is why the previous injectors got clogged up for cylinders 1 and 3. So it's back to rebuilding the engine (again!) So this will set me back for another year because I have other stuff going on in life. But I will do my best to prepare everything and set everything back together. I might need to change the turbo and the manifolds too, the aluminum intake manifold flanges were warped pretty badly, I would like to fix that with new design. Also the exhaust manifold was full of burnt up goop, and I fear that the turbo is too. But hey, it's good time to get a ball bearing turbo (which should help with my oil pressure thingy!) Edited April 28 by Atomic Quote Link to comment
datzenmike Posted April 28 Report Share Posted April 28 Were those intakes sent out and powder coated? Quote Link to comment
Atomic Posted April 29 Author Report Share Posted April 29 7 hours ago, datzenmike said: Were those intakes sent out and powder coated? Plastic Intakes are dyed and aluminum was painted from the outside only Quote Link to comment
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