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Throttle Bodies

Probably one of the most significant power upgrades you can make to your engine involves fitting throttle bodies.  Most modern engines use a single throttle body which feeds into a common plenum. This set up is easy to produce and install and also removes the need to accurately balance individual bodies at manufacture but has some significant draw backs. Firstly to give really good low speed engine control and good torque the throttle plate size has to be restricted which restricts air flow at high engine speeds. Also due to the common plenum the air flow into each cylinder is disrupted by the pressure pulses from adjacent cylinders.

By fitting multiple throttle bodies one throttle plate feeds each cylinder individually, massively improving airflow into the cylinder and therefore enhancing performance. By utilising different shapes and single or twin bodies almost any engine configuration can be catered for.

Northampton motorsport supply and fit throttle body systems from 3 respected manufacturers Webcon, Titan Motorsport and Jenvey Dynamics.

Webcon have been instrumental in bringing modern engine management systems within reach of the enthusiast and clubman competitor, they were the first company to offer a range of fully developed turnkey kits for a wide range of popular engine. The Webcon throttle bodies are superb quality and offer fantastic reliability and performance. These bodies are available in 40 and 45mm diameters and have air ports that allow for easy connection of an air bypass valve for idle speed control and also for servo and breather connection. Each barrel can be finely balanced to give super smooth idle quality. Easy to fit poly propylene air horns also support the air filter back plate and both top and bottom mount linkages are available making the installation process really easy.   

bodies, filters and air horns bodies and throttle pot

For a road car installation where precise control and reliability are key the webcon system is second to none.

Titan was founded in 1971. At that time, the company's business was the design and manufacture of single seater racing cars and engine preparation. As the company developed, the design, manufacturing and assembly facilities expanded to meet the worldwide demand for motorsport products and services. Titan now has a range of top quality precision machined components from limited slip differentials to their Roller barrel throttle bodies. Conventional throttle bodies use a central shaft and circular butterfly plate to regulate air flow into the engine. This works well at part throttle but when fully open the shaft and plate represent a small restriction to the airflow. For this reason very high performance applications have always used slide throttle arrangements where a sliding plate is used to regulate airflow. At full throttle the plate withdraws completely leaving no restriction to the air flow whatsoever. At part throttle however the plate would result in heavily disturbed airflow into the engine which made this system unsuitable for road car applications. The titan roller barrel uses a barrel with a hole machined through the middle, when fully open there is no restriction just like the slide throttle, but at part throttle the barrel restricts airflow without the disruption. This gives the best of both worlds with good part throttle operation and fantastic flow capability.

dcoe roller barrels duratec bodies

These roller barrels are available in 40 and 45mm sizes with dcoe flange patterns and also as a 45 mm taper direct to head throttle body for the Ford Duratec engine

Roller barrels are 892 plus vat per pair excluding trumpets.  trumpets are available from 35 to 100mm long and start at 23.50 plus vat eac

Jenvey Dynamics are probably the best known manufacturer of intake systems in the UK if not worldwide. Their range of products includes the popular dcoe flange pattern twin bodies to individual bodies in all shapes and sizes. This versatility coupled with a massive range of air horns, linkages, fuel rails injectors and other accessories means that Jenvey have a solution for just about any application. In fact Jenvey are sole supplier of intake systems for the BTCC and have been involved with manufacturer projects ranging from world superbikes to designing a bespoke intake system for the Nissan 350Z.

twin bodies with fuel rail single S F body

top linkage dcoe flange twin body

Jenvey also manufactures a range of inlet manifolds and air boxes to compliment the range of throttle bodies. As the range is so big it would not be practical to list all the prices here. But we have used Jenvey's engine price guide as an example of the cost of installing the SF type of body, 

Price for typical major parts required; Manifold, Throttle bodies, (SF body configuration), Fuel rails, Air horns.
All prices are shown without VAT.
Description Part no. Price Click for close up
Ford Zetec SF Click for close up
Ford Zetec TB

Click for close up
Ford Cosworth V6

Click for close up
Honda B16

Click for close up
Peugeot

Click for close up
Opel V6

Click for close up
Porsche w/c

Click for close up
Suzuki Hbusa
Alfa Romeo V6 12v + SF's CKAL01 1497.40
Alfa Romeo V6 24v + SF's CKAL02 1497.40
BMW Mini + SF's CKB01 862.50
Chevrolet LS 1,2 & 6 + SFDs CKCT01 2157.00
Citroen C2 + STs 40mm horns CKPG02 937.50
Ford Cosworth YB + taper SFs CKFD01N 946.50
Ford Duratec + TBs CKFD03 677.20
Ford Zetec + taper SFs CKFD02N 974.50
Ford Zetec + TBs CKFD03 677.20
Ford Cosworth Scorpio V6 + SFs CKFD11 1228.80
Ford Duratec V6 + SFs CKFD12 1502.40
Honda B16 & B18 C5 + SFs CKHA01 966.50
Honda B18 C1 & C4 + SFs CKHA02 966.50
Honda B16 & B18 C5 + TBs CKHA03 692.20
Honda S2000 + SFs     See Power graph CKHA05 1033.50
Honda K20 + SFs CKHA07 1018.50
Hyundai Lantra + SFs CKHY01 976.50
Jaguar V6 + SFs CKJR02 1502.4
Nissan SR20 + SFs CKNN01 991.50
Nissan VQ35 + SFs, straight trumpets (non 350Z) CKNN02 1673.65
Opel/VX 1.6L + taper SFs (UK/Ireland source via SBD Motorsport) CKVX02 893.50
Opel/VX 2.0L + TBs 27 / 34 / 0 Does not include water elbow CKVX03 / 4 / 5 677.20
Opel/VX 2L + taper SFs Does not include water elbow CKVX07 981.50
Opel/VX V6 + SFSs, curved trumpets CKVX06 1589.80
Porsche F6 3 Stud + SFs Specify port size CKPE01 1511.40
Porsche F6 3 Stud + taper SFs Specify port size CKPE03 1679.4
Porsche F6 2 Stud + SFs 3.2 litre Large Port SF Taper CKPE02 1701.40
Porsche F6 2 Stud + SFs small Port SF 40mm CKPE05 1611.40
Porsche F6 Watercooled + SFs CKPE04 1534.40
Peugeot/Citroen TU5 + STs 40mm horns CKPG01 937.50
Peugeot/Citroen 2.0 + SFs CKPG02 946.50
Peugeot Mi16 + TBs CKPG03 697.20
Renault Megane + taper SFs CKRT02 971.50
Renault Clio 172 + taper SFs CKRT03 971.50
Rover K + taper SFs CKRV01N 941.50
Suzuki Hayabusa + SSs CKSI01 929.70
Jenvey Dynamics Ltd. www.jenvey.co.uk       Jan09 q1

air box back plate V8 installation


Northampton Motorsport Limited. Unit 52, Rothersthorpe Crescent, Northampton. NN4 8JD
TEL: 01604-766624 Fax: 01604-706334 Email: