hey guys/girls, well i always ask for help on here n i always get it, n i wanna no if an a14 carby will fit on an a12 engine wit no probs, thanks

will fit, but will run rich, and be harder to start.

I've done the reverse and use an A12 carby on an A14. required drilling out of the jets to suit.

Chris

I used A14 carby on my daughters 1200 motor(10:1 comp and a small cam) car ran very well and still gave 28MPG.

Probably out of ignorance I have always substituted whatever A series carbs for each other to no obvious detriment.

i thiught the a15 had the richest jets and then the a12 and the a14 was all clogged up in jet size due to emmission controls etc.
Isnt that why a14 users usually run an a12 carby on their a14's?
Ive run an a12 on an a15 and a15 carby on an a12, not much difference, did just run richer but not by much.

Actually, the factory literature says the newer carbs are leaner. At least in the USA.

See the jet specs here: Carb adjustment, troubleshooting, rebuild and inspection

Primary Main Jet
A12 1971 No. 98
A14 1978 No. 104

Main Air Bleed
A12 1971 No. 80
A14 1978 Four-speed No. 110

The larger the air bleed, the leaner the mixture. The main jets are larger, tending to richen it back. Is it enough to make it richer than the A12 primary? Doubtful since the purpose of the newer carbs is "leaner, leaner, leaner".

But, notice that the secondary bore is richer for the A14:

Secondary Main Jet
A12 1971 No. 135
A14 1978 No. 145

Secondary Air Bleed
A12 1971 No. 80
A14 1978 No. 80

This fits in with emissions-control design, where full-throttle is usually tuned for good power, and everything else tuned for lowest emissions possible. The idle, off-idle, transitions, cruise, etc. should all be leaner for newer carbs.

When I built the 1200 engine for my wife's green 1000 two door back in the early 80's, I used a discarded electric-choke carb from an imported engine. There were lots of these imported engines around then & there were lots of discarded accessories, like carbs, to be had for nothing
I had always thought that this was from an A14, but it may not have been. From memory, it had slightly larger throttle bores that the 1000 ot 1200 carb that I was otherwise going to use.
I still have one of those electric choke carbs laying around somewhere.

I overhauled the carb & used it on this engine. It ran perfectly right from day one & the electric choke was a godsend for someone who didn't have the faintest idea how to correctly use a manual choke. Is this a women-thing?

Anyway, you now have piqued my interest & I will probably go find this other electric choke carb & get the model number from it in the hope that I can discover the car & engine that this one came from. Hmmmmm