77DAT Posted January 2, 2009 Report Share Posted January 2, 2009 I have a 77 Datsun 620, i found a 85 nissan at a junk yard. Will it fit?? Quote Link to comment
datzenmike Posted January 2, 2009 Report Share Posted January 2, 2009 The Z24 motor sits almost vertically, the L series is 12 degrees tilted to the right. So the answer is not really a bolt in, no. If you get the '85 tranny and motor mounts, it will it will bolt in. I don't know if your '77 has the 5spd, but likely the '85 will, and is newer and has up-graded front bearings and shifter. Be sure to measure the length of the '85 tranny... you want it to be about 31.5" long to fit your '77. This isn't a California '85 is it??? That would have the electronic feed back carb and would be a problem. Quote Link to comment
datsunaholic Posted January 2, 2009 Report Share Posted January 2, 2009 It doesn't matter if it's a California or not... all '84-86 Z24S 720s had feedback carbs in the US. Quote Link to comment
datsunaholic Posted January 3, 2009 Report Share Posted January 3, 2009 Yup. I have an '84 Federal feedback carb sitting in my garage. Being that I was there to yard it out (after test driving it, the truck was being converted to diesel) I could see it wasn't Cali. At some point the engine is supposed to go into my '83 (which ate a valve) but I have lots of manifold swapping to do. Quote Link to comment
ggzilla Posted January 3, 2009 Report Share Posted January 3, 2009 Or put the '77 engine into the '85 truck. Do those 720 feedback carbs run OK without the controller? Some work just fine that way. Quote Link to comment
datzenmike Posted January 3, 2009 Report Share Posted January 3, 2009 If the feedback solenoid fails, the carb defaults to a rich condition. Black tailpipe smoke and bad mileage. Doug as far as I can tell the '84 California Z24 used the DFP-384 feedback carb for stricter emissions control. It used an ECU controller and O2 sensor and had a six wire plug on it. When you say federal you mean state and government vehicles? '84 720 Non California and Canada used the DCR-384 carb with a two wire plug for idle cut and electric choke on it. Possibly all this changed in '85 or '86 and ECC carbs were required in all states. Quote Link to comment
Bugeye Posted January 3, 2009 Report Share Posted January 3, 2009 federal emmisions is all cars not shipped to CA, back then, now all cars are 50 state emissions (ie Ca legal) Quote Link to comment
datzenmike Posted January 7, 2009 Report Share Posted January 7, 2009 Doug. ALL 720s other than California, switched to feedback MID-YEAR '84 and for '85 on. No Canadian 720s were of the feedback type. According to my US 720 owner source.:D Quote Link to comment
datsunaholic Posted January 7, 2009 Report Share Posted January 7, 2009 Well, I never said Canadian ones had feedback carbs... my manuals don't cover Canadia after '81 or so. But, my '83 manual doesn't even have Z24s in it (just Z22) and I have a bone-stock '83 with a Z24 (built Feb '83). I don't think I have an '84 manual, and the only '84 trucks I saw had the feedback carb. Maybe they were all "late" '84s built in calendar year '84. Of course, what manuals I have don't even mention Fuel Injection in trucks until the 86 1/2 D21, and I have folks everywhere claiming to have seen EFI 720s that were "stock" complete with EFI logos on the side. I've never seen one; the only EFI 720 I've ever seen had a swapped-in KA24E. Quote Link to comment
datzenmike Posted January 8, 2009 Report Share Posted January 8, 2009 Well I have the FSM for the '84 and it shows the California truck with and federal and Canada without. Even the electrical only shows the O2 sensor wire as California only. My 720 friend said mid '84 change which would be the '85 model year. This is exactly what happened in '86.5 when the new Z241 came out for the D-21. There was a switchover of a few weeks where the remaining 720s got the TBI. No books list it. FSM don't cover it BUT there is an extremely rare 720 Z24i supplement that does cover the maintainance. Considered the 'Holey Grail' of 720 books lol. I've seen a picture of the booklet. I know several 720 guys with the Z24i engines and they aren't swaps. They have the harness with the ECU under the seat and are a factory anomaly. Completely possible to have an '84 Federal with feedback carb... I noted this down if anyone asks. Thanks. Quote Link to comment
coolioni Posted January 8, 2009 Report Share Posted January 8, 2009 I have a nice weber carb in my 1983 Z-2 4 engine and it is running great. You can't beat the price for what you get. I got mine brand new for $250 . It added quite a bit of horsepower to the engine compared to the stock carb. Quote Link to comment
datzenmike Posted January 8, 2009 Report Share Posted January 8, 2009 (edited) The Hitachi on the Z24 gives good to great mileage but performance... forget it! The primary even seems smaller than what you would expect on a larger displacement motor like the Z24. Some have various mixture heaters and deflectors built into the mounting gasket. http://i138.photobucket.com/albums/q251/datzenmike/720%20stuff/carb720mountinggaskets.jpg[/img]"] 720 owners rave about the 32/36 Weber and the power increase it gives. Make sure it has an electric choke and idle cut so that it can use the fuel shut off system. Edited January 8, 2009 by datzenmike Quote Link to comment
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