My 1980 Datsun 120 Y has A12(S) engine in its bonnet(its written on the plate on firewall). what is the difference between this engine and a normal A12?
barpk

Interesting! I have never heard of an A-12S. Doesn't really mean a lot that I haven't, I'm just saying.
Are you sure it isn't A-12A? That would be the later version of the 1200cc (ok, ok, 1170cc) engine with the short deck height of the old engine but the rearward placement of the distributor like the newer engines.

Quote:
isnt A12 (A) 1237 CC? its in the TECH section of this site.
mine is 1171 CC, if u stand infront of the car and look into the bonnet, distributor is on your left side.
barpk

is the distributor at the front of the block or more like half way down?, what sides alternator on?

Heya dude

A12 S? Is that whats stamped on the block and the plate? Maybe the S stands for speacial? Maybe Datsun had a deal with Pakistan dealers to hot the A12 up? Dizzy has been swaped sides but stall has same CC as A12? Sounds like the later model A12. What year is your Datsun??

Scott

there are 2 different A12 engines,
the first one has a bore of 73 mm. and a stroke of 70 mm. the displacement is 1171cc's, this is the one that was used in the B110 (1200) among others and made in the 1970's
the second one has a bore of 75 mm. and a stroke of 70 mm. (yes the cranks interchange) and displaces 1237cc's this one was made in the 1980's
the "S" designation is probably for a carburated designation.
when Nissan started to put fuel injection on different engines they began to use an "E" suffix to designate EFI and an"S" to designate a carburator
example: CA20S would be a CA20 with a carb, where as a CA20E would be a CA20 with EFI

my datto is 1980 B310 (RHD) and it is 1171 CC not anymore.
i think rgrinder is right about the S standing for carby setup, cos beside this i cant find anything else different,
BTW alternator(generator) is on the side where plugts r and so is the distriubutor.
barpk

I was about to ask what an A15 (S) is but I think the carb/efi answer sounds right.