I am about to start building a A12, I have a few goodies lined up to build it with.
But it makes me laugh to myself when I think that even with the performance mods my wife's 1.6 rusted out corolla will probably still be quicker.
But hopefully the A12 will sound nice.

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How is the turbo bottom end much stronger than the NA one? they use the same crank and rods as the turbo engine. the only real difference is the turbo ones have lower compression pistons and oil squirters to cool the underside of the piston.
Also how is it a pain to hook up the tacho? there is a tacho output from the ecu. It wont work with the standard tacho as it is an induction type and is annoying to hook up to anything. but for any normal tachos you just plug them straight into the tacho output signal wire and they work. Far easier than trying to adapt the whole "CA system" to the car, which i assume you would be talking about the whole s13 wiring loom and instruments

ive done a couple of CA conversions now and modifying the CA wiring harness to make it more universal then connecting the 6 or so wires that are needed from the 1200 loom is by far the easiest way of getting the job done

A rebuilt A12 with all the goodies would me my choice, don't get me wrong I've got a ca18det n pumps all the way to redline all day, but you start to feel very small an very unsafe after 220hp if something happened, and once that turbo bug bites your always chasing figures and becomes a money pit

But if I had endless cash and cheap local parts, RB25det would be way to go!

Gearbox is easy been there done that a RWD converted 3SGTE into a KE70,Crank trigger waste spark ignition,Custom inlet manifold similar to a four into one extractor but adapted for the inlet side and sized appropriatly.

Gearbox Toyota Misfire four Corona used a bellhousing that bolts up then add a 2 litre celica or Supra box to the mix.
Missfire four was that model they fitted the Holden Red motor variant the XU 2/3 engine to.

Sydney Toyota car club president of some years back had the car.

Also fitted into 1200's Z18 Turbo Marrone one in Fast Fours years back for a mate Wayne Selby,Massive job Bluebird turbo firewall and transmission tunnel,Full VDO custom dash Bluebird rear disks 240K fronts on Stanza Armstrong struts (The Grey ones for Aussie Stanzas used a 240 K size stub axle much stronger than the jap stanza struts.

Clutch master cylinder used a Formula Ford type mounted on top of the Steering column support under the dash with a remote reservoir in the engine bay on the firewall,This allowed room for a Sunny B310 Booster to be fitted.

Koni rear shocks for a Volkswagon passat station wagon fitted perfectly at the rear to upgrade the back dampers.

Also fitted a 4AGE with custom Extractors self made and Sand Bent to both a 1200 Ute and a KE30 Corrola Coupe,these are a good engine in a 1200.

CA18 as well to a 1200 but make sure even if you plan on using it normally aspirated base it on the Turbo CA18 as it is a much stronger bottom end,Hooking up the Tacho is a pain to these Coil on Plug Engines and something to be very carefull about,Best to adapt all the CA system to the car rather than just try to wire it into 1200 wiring harness.
When measuring for a tacho hookup I found the Ignition Module for the CA engines has 230 Volts and 10 Amps on the low tension side of the ignition circuit,That is the same s playing with a 240 Volt powerpoint in your home,Beware!!!.

12A bridge port EFI (datsun 1000)

i was toying with the idea for a toyota gt4 3sgte conversion on my datto. but finding a rwd gearbox proved to be very dificult and expensive. plus the dizzy is on the back of the motor so mounting woulda moved the weight foward from the firewall. So im running a A15 much easier and looks more suited in the engine bay than a newer motor.

well here is s/thing i'd like to do.Uno turbo [1400] motor in the front of a 1200 datsun. if only i can figure out how to do the set-up. I want engine in front but rwd. I know there is an awd uno running around but what they used is a mystery. this will be a great set-up --approx 200kg lighter and the engine is bullet proof [now has 400000k's]short distance it gives a M3 a hard time at more or less standard.motor just needs a refresh & a 1200 body and it's a for away.SOOoo it's awd gearbox or a damn box which turns in opposite direction LOL.Unless one of the bright sparks can come up with a better idea

12a rota POWER

Old thread revival!

DD your engine photo just made me pull out my old Bill Cosby records and listen to "Fat Albert's Car".

If you want power just go ca18 you'll spend 5g on a a series as still get eaten by a stock pulsar as much as I Love the a series there not worth pouring money into