venturi size help

[Fordy]

been stripping down my carb for some maintence and did a did of indepth measuring

found a 1.5m main jet :eek: will explain the 12afr off boost
and also the venturi is 26.30mm internal bore
yet it idle perfectly :confused:

i thought the group a carbs had a 27mm venturi? or is this a bit special?

i've got a spare 25mm venturi but if the 26.3mm one is ok i'd use that but with a 1.2mm main

anyone got any more info before i bolt it back on the car?

[Adey aka Ewok]

It'll be one that bored out, tbh I'd always run with a stock Venturi, nowt wrong with it atall

[Fordy]

swapped it over to a untouched 25mm venturi and 1.2main

and its running so much better from cold will take it out tomorrow for afr checking :cool:

[Fordy]

wow such a difference :eek: just come back in from doing some fueling checking and well I thought it was good before but now its awesome :D

Cruises nicely around 15afr
13~12afrs on spool and drops nicely into mid to low 11's on boost at 16psi all the way to the redline, baring in mind its used as a track day car

Carb spec incase people want to know to try out,

1.7 needle jet (cant fault it yet even on my long long long road for testing )
1.2 main
1mm ac
1mm 1st
1.3 2nd

16psi steady on boost in 5th on a stock T2

[Mart]

Renault had it (nearly) right from the start once again it seems ;)

[Fordy]

indeed :)

cant believe i didnt measure the venturi and main jet properly the last time i had it off, it could of saved me ££'s of tesco 99 and v-power :rolleyes: