weber jetting

[Ren]

I have a problem where engine if driven normally bogs down around 2500-3500 and think its jets on the weber 40 with 32 venturi. So has anyone got spare jets I can try or guess the problem.

[Mike Smith]

Dave,

I say this in the nicest possible way - I am not trying to score points - BUT - the only way of getting any car to run 100%, when it is a mixture of parts, is to put it on a Dyno or Rolling Road

You have a combination of 4 x elements

Venturi`s - Fuel Jets - Air Jets and Emulsion Tubes ---- Work out the permutations, it has to be correct

Air Filters and Intake stacks will also affect the running as will the exhaust System, this is a science not a guessing game

I know I am beating my old drum again but Rolling Road time is fantastic value for money and IF you choose the correct guy, he should also have all the jets and emulsion tubes in order to get it running correctly so all you pay for is his time and whatever parts you end up needing

[Paul Knight]

what mike said!

but, as a rule, i'd normally start with a 50 idle jet (or 55 if it pops), a 180 air, an F7 or F11 emulsion tube and something around a 135 or 140 main jet with a 32 vent. that should get you close, assuming your timing is on the money etc, but there's loads more to it...