1.3 SR performance cam into 1.2 12ST

[Novaload_Nick]

We know a 1.3 SR standard cam will fit the 1.2 (12ST)

but.. I'm wondering would wether a performance cam such as the 1.3 SR kent cam would still allow clearance between the valves and the piston??

Im sure it would but if anyone has any ideas on this it would be appreciated :thumb:

Nick

[millworm]

Should do mate, can't see why not. I don't think the heads are much different

[Royston]

Should be fine as long as the lift isnt extreme

[Stuart]

The carb will be the limit then

[Calamity Josh]

im running a 1600 fast road piper cam in my 12st with a set of 40's hanging off the back, have no idea on clearance, but she runs sweet as a nut and goes well.

[bighed]

So would a 1600 cam fit in my 1300S then?

[dgbnova#1]

Well going off the info above I'd say yes

[Novaload_Nick]

Be interesting to know what jets your using in the 40's josh?

[Stuart]

So would a 1600 cam fit in my 1300S then?

You might not have the fuel pump lobe on the 1600 cam though

[bighed]

You might not have the fuel pump lobe on the 1600 cam though

Good point well presented. That reminds me. I need to buy a new pump as mines gone noisey as funk.

[dgbnova#1]

Ye 1600 nv fast road cam would have the pump lobe Gsi or gte would not

[Calamity Josh]

Be interesting to know what jets your using in the 40's josh?
i could find out at the weekend if you would like? mine defiantly has the fuel pump lobe as i'm running mechanical pump still.
as im sure your curious it's a 12st, piper 1600 fast road cam kit (- vernier pulley) twin 40's, 1300 421 cast manifold and a sport backbox,with the std 1200 4spd box,

the cam seemed to lengthen my gearing considerably, change into 4th gear at 70 and it'd bog. she preferred the change up at just over 100... on a private road of course...
anyways it was 72.5 bhp and 70 ft pounds of torque, on the rollers and at 7k in 4th on the rollers hit 135 mph lol i have a printout somewhere :)

[Novaload_Nick]

It would be very handy if you could find out :) I was going to have a play with the 12st to see what I could get out of it

[Calamity Josh]

It would be very handy if you could find out :) I was going to have a play with the 12st to see what I could get out of it
will do at the weekend mate, and get a copy of the rr printout sheet, have a four branch sat here for mine, was also toying with doing the same, headwork e.t.c... lots of people have said to go 1300 crank and rods?

[Novaload_Nick]

will do at the weekend mate, and get a copy of the rr printout sheet, have a four branch sat here for mine, was also toying with doing the same, headwork e.t.c... lots of people have said to go 1300 crank and rods?

Apparently the 1300 crank and rods can make a lazy engine

[Calamity Josh]

Apparently the 1300 crank and rods can make a lazy engine
ahh might just see what i can do with the 1200, see how much power you can get n/a

[TeddyThom]

i could find out at the weekend if you would like? mine defiantly has the fuel pump lobe as i'm running mechanical pump still.
as im sure your curious it's a 12st, piper 1600 fast road cam kit (- vernier pulley) twin 40's, 1300 421 cast manifold and a sport backbox,with the std 1200 4spd box,

the cam seemed to lengthen my gearing considerably, change into 4th gear at 70 and it'd bog. she preferred the change up at just over 100... on a private road of course...
anyways it was 72.5 bhp and 70 ft pounds of torque, on the rollers and at 7k in 4th on the rollers hit 135 mph lol i have a printout somewhere :)

Sounds interesting... My 1400 isn't going to be much different to your set up. 14NV, Kent AST2 cam (when I can find and afford one lol), Weber twin 40's, 4 branch exhaust manifold, 2.5" straight through exhaust system and an F13CR... Should make for an interesting set up. I will eventually get a new head with some work done to it, thinking big valve and some polishing :)

[mowgli]

Apparently the 1300 crank and rods can make a lazy engine

I've been told that the 1200 block is shorter, but can't confirm it..

a 1300 with a rebore & 1200 pistons definitely makes a brisk little engine.

[Novasport]

I have measured the height of both the 13SB and 12ST externally and the 12ST block is considerably shorter.

[Novaload_Nick]

I've been told that the 1200 block is shorter, but can't confirm it..

a 1300 with a rebore & 1200 pistons definitely makes a brisk little engine.

Yea the 1200 has larger pistons but shorter stroke