difference between 1200 nv and st

[rallydak]

does anyone know what the differences are between the 1200 nv and 1200 st engines. i know the bore and stroke is the same so is the only differences in the head???

[mikey14sr]

NV being an SPi version has square inlet ports theat don't really flow as-well as the carb version head. I'm not sure but the combustion chamber shape may be different too.

[rallydak]

aww ryt. but i was wondering are the blocks the same as i have an st head here or else a 1300 head i could put on to it???

[stafford]

wrong the bores r different. the nv has smaller pistons but a longer stroke and the other the other wat around. the nv head is the little square port the st has the d shape same as the 1.3 head shape but the combution chambers are different

[rallydak]

are you sure because it says here on the club-opel website (sorry can't post the link) that the bore an stroke on the nv and st are the same but they have diff power out puts etc. and this is why i thought they ran two diff types of head.

[Adam]

Yes the bore and stroke are different, but the CC is the same, there both 1195cc

[stafford]

i put a 1.2 carb (12st) head on a 1.2i (c12nv) with a 1.3 inlet and a 1.3 pierburg carb that was fast to 90mph and and other car c12nv bottom end 12nv head 1.3 inlet plated to take spi wert to bad. at the min iv just built a 1.4 sr bottom arp's and lightened fly with a 1.3 head and inlet all ported up with a weber 32 - 34 dtml carb and last but not least a kent 270 profile cam. nice to see wat its like.

[rallydak]

ok well i need to get an st block from some where. any ideas where i could lay me hands on one???

[stafford]

scrapy supose

[rallydak]

have you modified many 1200's??? what have you found to be the best combination???

[Jack]

NV being an SPi version
Nope, NV is a carb engine.


there both 1195cc
1196cc. Injection is 1195.

I believe the NV has a little less power but more torque than the ST - I remember my NV feeling a "better" engine than the lower mileage ST I had. NV is lower compression than the ST as well, hence being N.

[Welsh Dan]

Isnt the NZ the spi one?

[Jack]

Yep, Z is single point injection. E is multipoint.

[craig green]

I'd have an old carbed 1200 over an SPi anyday. Its the cam lift that limits these engines the most.

I'm sure I read that the stroke/bore was changed on the 1200's on the later Spi engines in the Corsas???? Maybe wrong.

[rallydak]

so is the bore and stroke in the nv the same as the st and the only diff is in the head??? the reason i am asking is i want to run a 1300 head with the wider bore and shorter stroke 1200 engine. so i need to know if the nv and st 1200 bottom ends are the same????

thanks

[Adam]

No, the bore and stroke is DIFFERENT

[mikey14sr]

Isnt the NZ the spi one?

Oh boll*cks yeah, sorry this work lark's affecting my memory!

[rallydak]

ok, but in this link below it says they are the same?? and did razorjack say they had the same dimensions??? sorry getin really cofused by this but i need to know soon, thanks

[rallydak]

yhrt

[rallydak]

www.club-opel.com

[mowgli]

the 12st has the same head as the 1.3 anyway..........

I think you'll find the nv is different to the st, but that german site appears to be the only one that lists it.

[_JH_]

don't think the NV was available here.

It may well have the same bore and stroke as the NZ as I think it was the replacement [in Europe] for what we consider to be a carb 1200 engine.

Alternatively it may just have the square port head like the 14NV but with the same short-stroke bottom end as the 12ST

That was helpful wasn't it lol

anyone actually have a 12NV?

[Jack]

Yep, me (well, HAD one).

J reg 1.2... iirc it didn't have a square port head.

[rallydak]

still confused here lol. so do they have the smae bottom ends?? anyone here owned one that knows for definate???

and are the 1200 st heads the exact same as the 1300 heads, as someone above said they are???

[Welsh Dan]

The combustion chambers might be different, but the ports and valves are the same.