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Pricelist: AUD Pricing Pricelist
Pricelist: AUD Pricing Pricelist

Carburettor - JB Shorty 45mm 

JB Shorty Carburettor.

– Our Shorty carburettors are supplied set up for use with our Budget supercharger kits.
– Custom steel JB Velocity stack included
– Carburettors are shipped with a baseline tune for a 1600 that will help you get up and running

We also include technical assistance for installation and tuning.

Fitment Notes

  • IMPORTANT!  Fuel supply pressure max 1.5psi 
  • You WILL need to use the correct regulator with this carburettor
  • Universal foam air filter recommended and available to purchase separately
  • Manifold not included but also available to purchase separately.
  • We can also custom make manifolds to suit your application. Just ask.

Please note that this is NOT an S&S branded carburettor

AU$ 180.00 AU$ 180.00

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Shorty Carburettor Tech Info

Some important information...

The S&S Style Shorty carburettors are fussy when it comes to fuel pressure. This is because in their original application they were gravity fed. For this reason it is absolutely necessary to run a fuel pressure regulator (FPR) to ensure that the float valve does not bypass

Most generic carburettor FPRs regulate fuel to between 4-7psi which is way too high for this style of carburettor. Ideally you need a fuel pressure regulator capable of regulating to 1.5psi. You also need to validate this with a fuel pressure gauge.

It is also worthwhile matching your fuel pump choice to your engine's fuelling requirements too. If the pump is too large then your FPR will continually bypass or the pump will be constantly over-working.

Suitable FPRs are Holley 12-804 or Malpassi Fuel King / Filter King. Be sure to purchase a good quality gauge to set the pressure. Do not be tempted to use a cheap components here as they will not be accurate.

If the fuel pressure is too high, the fuel pump will overcome the float valve and instead of stopping the fuel delivery as it should. Fuel will continually pump into the carburettor, causing an over-rich condition and making tuning impossible. In extreme cases excess fuel may even leak out of the carburettor.