|
NA CVH : Carburettor Options |
|
|
There are several options of carburettor fitted to
N/A cvh’s. These are dependant upon engine capacity and year. If
you’re vehicle is equipped with a Ford VV then changing this for a Weber
is the first move. The 1.4 cvh was fitted with a Weber 28/30 DFTM which
was primarily fitted for fuel economy. The 1.4cvh inlet manifold will take
the Weber 34/34 DMTR carburettor, but will require the manifold to be
machined to accommodate the 34 mm throttles. The 1.6cvh’s came with
either a Weber 32/34 DFT or a Weber 30/32 TLDM. I would recommend
reverting any vehicle fitted with the TLDM carburettor to the DFT. This
will involve using the DFT inlet manifold, or using a modified 1.4 item. The 34/34 DMTR is the best of the bunch and once the
venturis have been machined to 28mm will be adequate for up to 140bhp with
a suitably specced engine. Here is my recommended jetting for this
carburettor on a fast road 1.6cvh fitted with my stage 3 head and Piper
285 cam: Primary: F30 Emulsion tube, 135 main, 165 air
corrector, No.4 auxiliary venturi, 55 idle jet, 55 pump jet Secondary: F30 Emulsion tube, 145 main, 165 air
corrector, No.4 auxiliary venturi, 60 idle jet, 55 pump jet After around 140 bhp it is necessary to upgrade the
carburettors to twin DCOE’s. It is arguable whether its worth using
40DCOE’s given the capability of the DMTR, and so for this reason I
recommend for the next step the use of 45 DCOE’s. Remember to use 34mm
chokes as anything bigger will result in midrange torque loss. Equipped
with a suitable head and cam and exhaust around 165bhp is attainable. |
|
|
|
|