16 valve and twin 40's

[fastcar1cars]

hi people
iv got a nova 1.4 sr on twin 40's just wondering if i were to put a 2 litre 16 valve in it can i still use the twin 40's and the same manifold??

[nathan.]

No, you can't use same manifold. 45's would be better for a 2.0.

[burgo]

no you really want 45's and the inlet manifolds are completely different i beleave

[Chris]

Yes and nope. The 40's will work but not right, they arent big enough and the manifold wont fit

Chris

[fastcar1cars]

what about an 8 valve 2 litre

[nathan.]

no chap. you need a totally different manifold. 45's on 2.0ltrs

[Stuart]

there is a point atwhich the air flow through a webber changes EG running a T40 with 35mm chokes probably wont flow aswell as a T45 on 32 mm chokes (thats an example and not real data as they might be different points)

i mean there is a chap on here running 45's on his 1.4 16v lol ;) and its rather goodl,

[Philsutton]

like whats already been said 40s will be too small, i have 45s on my 2lt 16v an the guy at the rolling road actually said i could do with a set of 48s to get the best out of the engine.

[Austin_Nova16]

what size chokes do you run Phil? I'm on 38mm ones i think..

I ran 40's on my XE for a short while. They gave bags or low rev torque, which ment that 2nd gear starts were the norm. Peak power was pants though, as they couldn't get enough air in.

[Philsutton]

im not sure on the chokes to be honest, i have a feel when i brought them they had 36mm - 38mm in them.

[Snowface]

T40's are at their limit at around 1800cc on a standardish engine.

a well modded 1.6 would be better on 45's. but 40's run very happily also.