SR20 throttle body set t/bore 52/50/48

kit includes 2 x direct fit tapered bore throttle bodies 52/50/48, fuel rail and mountings, linkage, 4 x ram tubes and bases
* note - injectors, fuel rail fittings and tps not included in kit price but can be supplied on request

Product Details

SR20 Pro-Race Throttle Body Kit Contains:

• 2 x Pro-Race Tapered Bore Throttle Bodies - Sizes 52/50/48
• 1 x Pro-Race single piece billet alluminium fuel rail kit
  • Choice of -6 or -8 AN Fuel fittings
• Pro-series 4 Cylinder Linkage Kit - Includes:
  • Joiner Balancer Cable Pull Throttle Stop - 6061-T6 Aluminium
• Throttle cable bracket & 4 x Pro-Series ram tubes
• Comes fully assembled - Can also be purchased as a parts kit (throttle bodies are always factory pre-assembled) , call for subassembled price.

• (Manifold, TPS and injectors not included) P.O.A. for these items

TAPERED BORE THROTTLES

 

Tapered Bore Throttles have a clear advantage over Parallel Bore Throttles at increasing power and torque. By accelerating the air through a venturi (in this case a tapered bore) the air speed through the throttle body is increased.  This enhances the engine cycle's scavenging effect to provide more air and fuel in the combustion chamber and therefore more power and torque.

 

The Tapered Bore has 3 sections:

Inlet from ram tube - 52mm

This then tapers down to a short parallel section for the throttle plate - 50mm

There is a second taper down to the outlet flange of the throttle body - 48mm

HP RATINGS

 

HP/kW Ratings vary from engine to engine.  The power ratings given here are only a guide, and are not absolute power ratings.  Engine power is determined by intake, exhaust, cylinder head design, camshaft design, compression ratio, fuel type and quality and many other factors.

 

50mm - 74HP/58KW* per throttle - with the tapered bore giving a potential for 5% above this figure.

 

*This number is a guide only and should be used in conjunction with real-world experience.

PROFESSIONAL GRADE MANUFACTURE

Manufactured from 601 Cast aluminum and heat treated before being CNC machined.

The butterflies are measured for each bore & precision machined to a 0.0005"" tolerance.

Butterflies are secured to centreless ground brass shafts with split screws to ensure reliability and serviceability.

All are fitted with bearings rather than bushes to eliminate axial shaft movement.

Low stiction bearings for sharp throttle response.

We now recommend

and use SKF bearings.