1.2 ohc carb modding

[cov_street_racer]

heya guys, i have a 1.2 carb and i wous woundering could i fit a 1.3 head onto it????? and eventually fit 1.3 cams?????
thanks eddie

[Jon_nova1]

1.2 and 1.3 head are the same

[turbojolt]

i think he must mean the sr head

[cov_street_racer]

i do turbojolt

[Stuart]

1.3 and 1.3 "sr" head is the same.....

[turbojolt]

1.3 and 1.3 "sr" head is the same.....

did not know that i must say but the cams must be compleatly diffrent

[Adam]

Cams are the same too.

Nowt special about a 1.3SR engine.
Just a normal 1300cc engine

[turbojolt]

Cams are the same too.

Nowt special about a 1.3SR engine.
Just a normal 1300cc engine

so would 1.4sr cams fit in to it

[Adam]

Yeah, but the dizzy is different so you wont be able use a 1.3 dizzy.
Pointless going from a 1.3 cam to a 1.4 one.

[turbojolt]

Yeah, but the dizzy is different so you wont be able use a 1.3 dizzy.
Pointless going from a 1.3 cam to a 1.4 one.

no dont forget he has a 1.2 mate

[Adam]

Oh sorry, thought you were asking if a 1.4 cam would go in a 1.3.

My post still applies anyway :p

Will need to change dizzys to fit a 1.4 cam.

[turbojolt]

Oh sorry, thought you were asking if a 1.4 cam would go in a 1.3.

My post still applies anyway :p

Will need to change dizzys to fit a 1.4 cam.

only just lol

[Martin]

32/34 carb
1300 head & inlet
piper 285 cam/1400 cam


thats what i'm doing to mine with either a 4 branch for a 4-2-1 system from an sr

[Jon_nova1]

doesn't the sr just have a closer ratio gearbox?

[mikey14sr]

doesn't even have that in a lot of cases!

[mowgli]

get rid of the 4-1 manifold & downpipe, & replace it with a 4-2-1.
Don't bother changing the carb/head
Then get a 1300 crank & rods & fit them
You now have a 1.4 hi-compression engine with a 1.2 engine number & no noticeable outer changes (for the insurance)
IT will go very quickly for a 1.2

[Adam]

It wont be a 1.2 tho lol

[mowgli]

I KNOW THAT but tuning a 1.2 is about as much use as bulls tits

[Adam]

If you want to mod a 1.2, i'd keep it sensible.
Something along the lines of novalicious's spec would be the max i'd bother do to one. If you can find second hand parts.

[mowgli]

ok, but a secondhand 1300 crank & rods & a bit of mechanical knowledge would get you about 90hp for about ?50, or ?150 with some piston rings & a head gasket

[turbojolt]

ok, but a secondhand 1300 crank & rods & a bit of mechanical knowledge would get you about 90hp for about ?50, or ?150 with some piston rings & a head gasket

this sounds intresting mate how much work is involved in to geting the pistons and crank to fit

[Jon_nova1]

none, put the 1.2 pistons on the 1.3 crank and you get a 1.4 dont you? replace the piston rings for around ?40-?50, head gasket set ?15 and bolts for ?10, job done

[turbojolt]

and that is all i would have to do to get 90 hp

[Stuart]

and tell insurance lol..

[turbojolt]

and tell insurance lol..

yes tell them *cought* lol

[turbojolt]

would a gsi gearbox or gte one fit to this engine

[Jon_nova1]

no

[Stuart]

yes it would.... but need to be carefull not to get a WR box.

if you dont tell the insurance people, i hope to christ you dont drive outside the M25 :p

[turbojolt]

yes it would.... but need to be carefull not to get a WR box.

if you dont tell the insurance people, i hope to christ you dont drive outside the M25 :p

but they wont strip the engine to find out will they

[paddy138]

they wont strip the engine, gsi box will fit but your car will be harder on petrol as it is not designed to drive that gearbox, she would be quicker in the lower gears and slower in the higher gears.

[turbojolt]

they wont strip the engine, gsi box will fit but your car will be harder on petrol as it is not designed to drive that gearbox, she would be quicker in the lower gears and slower in the higher gears.

what so you would keep the orignal gearbox

[paddy138]

yeah or get one from a 1.3 or 1.4, mite have some difference, not sure tough

[turbojolt]

yeah or get one from a 1.3 or 1.4, mite have some difference, not sure tough

what like a sr gear box

[paddy138]

yeah but i dont know if there different, im sure some of the other members could tell ya

[turbojolt]

yeah but i dont know if there different, im sure some of the other members could tell ya

i heard the sr's have close ratio gearboxes

[Stuart]

paddy, please learn about the nova gearboxes then come back and try agian,

the gte/gsi had F13's fitted, most were CR's but some are WR's its luck of the draw in that case.

the ratios are on my siglink site in the speed in gear bit. one of the links there has info for the exact ratios.
With a CR fitted it will accel faster in each gear topping out earlier than before with the WR box on.

you might use more fuel as the engine speed for a given road speed will be higher but not that badly.

[paddy138]

yeah isnt that why i said to ask some of the other members. why are all the premium members arrogant on this forum

[Stuart]

sorry if facts seem arrogant... meh like i care :p

[paddy138]

yeah there facts but your ignorant about it the whole time, just say things dont be ignorant, it wont get you too far in life