t 40 jet sizes on1.4 with 1.3 head

[dan23]

gonna run twin 40s on 1.4 sr gonna use 1.3 head
the carbs r jetted for a cammed 1.3 sr will it do any harm if i run em how they without changeing jets

[Dan]

i dont know the best options for this, but the jets you have will be enough to get it running i would presume, then like anything on carbs it will need to be rolling roaded so the carbs can be tuned to the exact requirements

[dan23]

so if i didnt get it rolling roaded straight away it would be ok an it wouldnt melt the engine like some say can happen

[Adam]

It should run Ok if its jetted for a 1300, and its on a 1400.

[thirdeyeblindman]

heres what stephen gault put in my nova sport- he wrote it on a piece of paper for me so id have it for future ref.. might be of help to you

30choke
115mains
F16 emulsion tube
175 air
45F9 idle
40 pump

[Snowface]

my 103bhp 1.3 was running 125 mains with 30mm chokes.

some where between 120 and 130 would be a good starting point i'd have thought.

[thirdeyeblindman]

it depends on how efficient the headwork is.

mine was setup on rolling road and has been together for several years now..

it gave 94@wheels

[Jon_nova1]

you shouldn't get melted pistons, it only happens when the fuel going in is stupidly weak, id think your sparks would disintegrate and stop working first though

[dan23]

its a standard 1.3 head an that i am using an the bottom end is standard 1.4

would it be better if i used the 1.3 head with the 1.4 cam

[Jon_nova1]

yes, thats abit like my setup, the 1.3 head will flow better than the 1.4 and the 1.4 cam has a better profile

[dan23]

so because i am using 1.4 bottom end it would be better if i used the 1.4 cam with the 1.3 head should i swap the cam followers over i mean put the 1.4 followers on the 1.3 head to use it with the 1.4cam

is there alot of difference in the 1.3 1.4 cams profile

[mad-driver]

not much difference as far as i know, but it all counts, i do know that the 1400 carb cam has the most lift of all, especially on the inlet

[Adam]

Theres not much difference between the 1300SR cam and the 1400Sr cam.
1400Sr is slightly better.