Carbs

[MF 131]

Hi Looking at fitting twin 40 side draughts weber or dellortos on my 131r/sport.It has been fitted with 1608 cams ( cam driven dizzy) What would the best size chokes etc. Leaving the standard exhaust manifold but putting 2 inch pipe. Any help would be appeciated.Cheers Gary

[Shovel]

Hi MF 131,I've put twin 40 solex sidedraughts on my 2 litre,everything else is standard.They have 32 chokes,made a huge difference over the standard single downdraught,has all the right sounds now too 
Shovel.

[sid131]

twin carbs came fitted on the 131 sport i just bought but have no air filters will post a pic tonight for advice.

[Tas131]

This chart shows venturi size for a throat per cylinder :ie for a 2litre you'd be looking at 500cc per cylinder. If you want a 2 litre to breath well up to 6k/rpm, 37mm venturis are required, although for a non race setup 34 or 35 is plenty. I had 32mm venturis on my warmed 2 litre and it started running out of puff around 5500, but it did rev to 6500.