mmm, so very roughly, if you say an A14 cylander holds 350cc, + say 4cc for a headgasket

354/34 = a C/R of 10.4:1 with a flat top piston....
Which would be bloody fabulous for a hot road motor, that sorta compression would make a fast road/rally cam light up beautifully..

Mitsi Galant (1750?) pistons work, they're 79mm and more or less flat topped...I hear good things about the mazda ones too...

GX engine has higher compression, but was a Japan-only engine.

Ive taken the head off and using a syringe (very teco) I mesured the chambers in the head

A14 = 30cc
A12 = 27cc

this is a bit rough as I was holding the heads level and porring at the same time but it pretty close i think. The a14 comes with dished pistons where as the a12 comes with flats tops (or has my coupe got aftermarket ones?).
But according to some info I found on the a series all three have the same compression ratios. maby the a12 dosent have a full stroke?

Usually ...

A14 "GX" = high compression
A15 normal = low compression

But there might be variations, as Tsillay found.

The difference, if any must be subtle!
I did once find a factory A14gx with twin hitachi SU's which had flat top pistons and huge combustion chambers in the head. This head wasnt up to much!
I swapped the head for a normal A14 oval port one, popped on a pair of 40 dellortos and headers and the thing simply flew!
It was in a coupe, with the dogleg 5 speed and some kyb shocks... To this day that's the most fun road car I've ever had....

Thanks heeps tsillay!! thats exactly what I needed to know.
One more question; is the a14GX head any different than a oval port a15 head?
cheers
Quinn

ps ddgonzal I plan to take the lot. I can start the 1200 with a spoon handle. not so safe.

Good score Quinn!

the box you've got will be an FS5W60L.
Ratios are
3.513
2.170
1.378
1
.846

I've still got an SGX workshop manual somewhere around if you get stuck for drawings...

Quinn, the ignition swith isn't connected to the key. It is just a little electrical switch with two screws holding it on. You are thinking of the ignition lock or whatever that's called, which is bolted to the steering column with two headless bolts (difficult to remove). The switch is bolted to the bottom of this.

Yes Dodgeman I mean DOGLEG gearbox sorry if my abbreviation was to criptic for anyone.
as for datral_10 saying:
Are you sure it's a dogbox and not just a close ratio 5 speed?
dogleg boxes are mecanically different in both the arrangement of the gears and therefore the selector arrangement, whereas short ratio boxes just use different cogs for different ratios. Quite different. I cant find any info on the ratios of the dogbox but i havent realy looked yet so I cant confirm anything.
Cheers
Quinn

I've got an electric fan installed in my car, it helps heaps to cool the motor down, especially if your idling for any long periods of time... I bought the fan and thermostat attachments for less than $50 from super cheap auto, and then it was only a matter of finding a good spot to mount it. A friend and i mounted it of the original radiator mounts..