Twin Carbs

[mini magic]

Wondering what do twin carbs do and do they give you alot better performance and whats a good one.

[robminiman]

on a small bore engine 850 998 1098 then personally twin 1.25 twin su carbs cant be beaten
on a 1275 upwards twin 1.5 su carbs are very good or on a more modded one twin 1.75 su's
the ultimate in carbs is twin 45 webbers only really for full race stuff

[DanGT]

40 Webbers work well with smaller engines. A webber 40/45 is more or less a twin carb in a single body. Twin carbs should give more power. More air fuel in more out, The big thing is being able to let more air in (flow). The amount of gain will vary, what engine spec do you have now?

[Huff]

Alternative view - I never found twin carbs worth the bother; one big enough carb is easier to set up and generally gives really good throttle response. I ran an HIF6 (iirc) on a 1275 making about 80hp and never felt it was worth the (substantial cost) of going up from there.

[morgrp]

robminiman said:

on a small bore engine 850 998 1098 then personally twin 1.25 twin su carbs cant be beaten
on a 1275 upwards twin 1.5 su carbs are very good or on a more modded one twin 1.75 su's
the ultimate in carbs is twin 45 webbers only really for full race stuff

Most racers favour a single twin choke webber - as twin 40's dwarf the engine a bit - also a single twin choke webber is effectively like having twin carbs anyway. The biggest problem with running twin carbs is getting them balanced - Something a lot of people don't seem to be able to do. Another reason racers favour single webbers, for the easier setting up. Twin SU's will be easiest as the manifold is readily available and the carbs are a bit cheaper to buy than a webber but its really down to budget - anything is possible with a mini!!!

[DanGT]

A lot of the race minis use 45 webbers if they can (some race rules say you must not chang the carb/injection). Nearly all the mini I have seen that sprint use twin SUs or webbers, mini7,migalia use webbers depending on class also the grass track cars. Single webbers and single SU are good but depnds on engine spec. Twin SUs have a bad rep becuse people use old and worn out ones. There are a number of people how can set them up for you (extra money) but it depends if you have some one close to you.