RDMK Posted February 16, 2023 Report Share Posted February 16, 2023 I want to buy Datsun 720 1980/83. I would like to know about the fit of the gearbox from the SR20DET to the body of the 720. I would also like to know how it is with the differential, will it need to be changed after replacing the gearbox with one from the s13? My last question concerns the car's computer, whether to install it from s13 or better to leave the 720. Chcę kupić Datsuna 720 1980/83. Dzięki czemu opracujesz skrzynię biegów z SR20DET do korpusu 720. Czy też wiesz, jak jest z mechanizmem różnicowym, czy po dniu roboczym na taki z s13 będzie trzeba iść dalej? Moje ostatnie pytanie dotyczy komputera auta, czy zainstalować go od s13 czy lepiej zostawić 720? Quote Link to comment
RDMK Posted February 16, 2023 Author Report Share Posted February 16, 2023 9 minut temu RDMK powiedział: Coś mi przetłumaczono na język polski😅 Quote Link to comment
RDMK Posted February 16, 2023 Author Report Share Posted February 16, 2023 I want to buy Datsun 720 1980/83. I would like to know about the fit of the gearbox from the SR20DET to the body of the 720. I would also like to know how it is with the differential, will it need to be changed after replacing the gearbox with one from the s13? My last question concerns the car's computer, whether to install it from s13 or better to leave the 720. Quote Link to comment
]2eDeYe Posted February 16, 2023 Report Share Posted February 16, 2023 Welcome. You will need the engine, transmission, ecu and harness for this swap. It also does not directly bolt in very well. Rear sump pan and moving the alternator up is required as well. The rear will work behind the SR, but won't last if you plan on putting power through it. I have mounts to make this a clean (level) bolt in, but I am sure shipping to Poland is $ 🙂 1 Quote Link to comment
datzenmike Posted February 16, 2023 Report Share Posted February 16, 2023 The Z22 engine did not use any ECU and was a carburetor, so there is nothing there to use on the S13. The S13 transmission is an FS5W71C which is similar is size to the FS5W71B that would be in the 720. It will almost certainly be about 10cm longer, so the drive shaft will need to be shortened. The S13 uses a electronic speed sensor but your 720 speedometer pinion sleeve should just bolt in and work. Quote Link to comment
Stoffregen Motorsports Posted February 16, 2023 Report Share Posted February 16, 2023 Not sure what availability would be like in Europe, but in the USA, buying a complete donor car for an engine swap is always a good idea. Not only will you get most of the parts you need, you will also be able to see how it works before you take it apart. 1 Quote Link to comment
datzenmike Posted February 17, 2023 Report Share Posted February 17, 2023 8 hours ago, RDMK said: I want to buy Datsun 720 1980/83. This is still in the early discovery phase if 'What IF????". Maybe get the 720 first, Buying a JDM S13 SR20DET is a bit much, maybe it was in an accident? Usually the engine importers include the ECU with it. Quote Link to comment
Stoffregen Motorsports Posted February 17, 2023 Report Share Posted February 17, 2023 Sure, the ECU, but there are so many components that make the whole. For a first time engine swapper, making an engine run without knowing what it is you're missing can be daunting. Quote Link to comment
]2eDeYe Posted February 17, 2023 Report Share Posted February 17, 2023 Always nice to swap in something you know worked before you swap it. Builds and rebuilds can happen later, after it works where it isn't supposed to. 1 Quote Link to comment
bottomwatcher Posted February 19, 2023 Report Share Posted February 19, 2023 Yep. I always get an engine running on a stand before a swap because the access to issues is so much easier. But if it is a common swap with lots of aftermarket support well? Unfortunately I haven't done one of those. Must be nice. Next swap LS whatever! Quote Link to comment
RDMK Posted February 27, 2023 Author Report Share Posted February 27, 2023 On 2/16/2023 at 6:24 PM, ]2eDeYe said: Welcome. You will need the engine, transmission, ecu and harness for this swap. It also does not directly bolt in very well. Rear sump pan and moving the alternator up is required as well. The rear will work behind the SR, but won't last if you plan on putting power through it. I have mounts to make this a clean (level) bolt in, but I am sure shipping to Poland is $ 🙂 Why does the rear oil pan need to be there? Quote Link to comment
]2eDeYe Posted February 27, 2023 Report Share Posted February 27, 2023 The 720 suspension is in the way. Quote Link to comment
RDMK Posted February 27, 2023 Author Report Share Posted February 27, 2023 Just now, ]2eDeYe said: Zawieszenie 720 przeszkadza. And what does it look like with the connection of the later gearbox. The original pan is supposed to adhere to it, the rear oil pans no longer do it Quote Link to comment
]2eDeYe Posted February 27, 2023 Report Share Posted February 27, 2023 You don't really need a cover there, but you could make a sheet metal one pretty easily. Lot's of factory engine to transmission mating is like this. Quote Link to comment
bottomwatcher Posted February 27, 2023 Report Share Posted February 27, 2023 Should be a steel plate that sandwitches between the engine and transmission. You have to put it on BEFORE bolting on the flywheel. Ask my why I remember this. Quote Link to comment
RDMK Posted February 27, 2023 Author Report Share Posted February 27, 2023 What about the drive shaft if I replace the gearbox from the s14 6speed and the differential from the s14 in the datsun 720 differential housing? Quote Link to comment
datzenmike Posted February 28, 2023 Report Share Posted February 28, 2023 S14 are IRS for independent rear suspension. The 720 is a solid axle so nothing of the IRS will fit the 720 axle. To use the S13 IRS you would have to take the entire sub frame that everything mounts to and remove it, strip all the 720 axle and suspension out and somehow mount the S13 stuff in. One way to get it right and an infinite number of ways to cack it up. Quote Link to comment
RDMK Posted February 28, 2023 Author Report Share Posted February 28, 2023 41 minutes ago, datzenmike said: S14 to IRS dla niezależnego tylnego zawieszenia. 720 to solidna oś, więc nic z IRS nie będzie pasować do osi 720. Aby użyć S13 IRS, musiałbyś wziąć całą ramę pomocniczą, do której wszystko jest przymocowane i zdjąć ją, zdemontować całą oś 720 i zawieszenie i jakoś zamontować elementy S13. Jeden sposób, aby zrobić to dobrze i nieskończona liczba sposobów to spieprzyć. it is possible to transfer the differential from the s14 to the datsun differential housing. I'm thinking of connecting the shafts one from the s14 gearbox and the other from datsun. Quote Link to comment
RDMK Posted February 28, 2023 Author Report Share Posted February 28, 2023 What to do to make the differential survive the sr20det? Quote Link to comment
thisismatt Posted February 28, 2023 Report Share Posted February 28, 2023 Don't dump the clutch or do a bunch of wheel-hopping burnouts and it'll be fine Quote Link to comment
datzenmike Posted February 28, 2023 Report Share Posted February 28, 2023 1 hour ago, RDMK said: it is possible to transfer the differential from the s14 to the datsun differential housing. I'm thinking of connecting the shafts one from the s14 gearbox and the other from datsun. 2 hours ago, datzenmike said: S14 are IRS for independent rear suspension. The 720 is a solid axle so nothing of the IRS will fit the 720 axle. To use the S13 IRS you would have to take the entire sub frame that everything mounts to and remove it, strip all the 720 axle and suspension out and somehow mount the S13 stuff in. One way to get it right and an infinite number of ways to cack it up. NO, it will not fit the 620 differential housing for the reasons given. As Matt said the 620 differential is plenty strong Quote Link to comment
RDMK Posted February 28, 2023 Author Report Share Posted February 28, 2023 5 godzin temu thisismatt powiedział: 4 hours ago, datzenmike said: NIE, nie pasuje do obudowy mechanizmu różnicowego 620 z podanych powodów. Jak powiedział Matt, mechanizm różnicowy 620 jest wystarczająco mocny It is supposed to be a Datsun 720 with sr20det with a 6 speed gearbox. Will the differential handle it? Quote Link to comment
thisismatt Posted February 28, 2023 Report Share Posted February 28, 2023 6 hours ago, RDMK said: It is supposed to be a Datsun 720 with sr20det with a 6 speed gearbox. Will the differential handle it? Don't dump the clutch or do a bunch of wheel-hopping burnouts and it'll be fine. The weak points are the spider gears...they won't handle a lot of shock loads. 1 Quote Link to comment
datzenmike Posted February 28, 2023 Report Share Posted February 28, 2023 The H-190 is good for almost 300 ft lbs of torque. At low speeds the tires will break loose and act like a fuse. Quote Link to comment
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