Hi guys,

As above, vague question I know, but what could I look for from a pair of 40's with 30mm chokes before needing to go up to 32 or 34mm ones?

Not for a Ford, but just wondered if what I have will be a limiting factor at all.

Thanks

Weeksy

 

a pair of 40 on a pinto will make different bhp to a 40s on a xflow, so its kind like how long is a peice of string question

 

Let's say a 1600 x flow....

 

Well going back a long long time, my old 1700 x-flow made 155Bhp on 32mm chokes...........but the engine was full steel race spec.

 

Cool.

I am building up a 1360cc engine for my 205, and wondered if 30mm chokes will get in the way of it making the right side of 140 bhp
I reckon the 30mm will do ok.

Thanks

Weeksy

 

A very vague question!!! hehe

Depends on a number of things, there is no honest answer....

Depends on CC of the engine, desired engine speed, Cam lift and duration, valve size etc....Truth is u can just play with choke size, remember too small a set of chokes are not always better, smaller chokes increase the speed of airflow and if the opening (Inletmanifold ID) is too great you can suffer from fuel droplet drop out, when the Fuel drops out of the Stoiometric (is that how u spell it?) mixture causing your car to run lean... again Larger chokes might not allow the airspeed to be high enough to achieve proper atomisation....

The best way is to play about, start with what u have and try it, I changed my chokes down 1mm in my dellortos, i saw no power difference that i could tell and they skinned me 80 quid for the chokes!!!

Iain