Why Jenvey induction systems?

Overview
Developments in solenoid injector, computer managed, fuel injection have re-established fuel mixing and distribution amongst the most important areas for performance gain; whether for power, torque, economy or emission reduction. In addition, the ability of current engine management systems to cater accurately for virtually any combination of load, rpm, temperature, pressure, feedback information and rate of change has made response and driveability an important and tuneable element in any engine specification.

Detail
Our injected throttle bodies are designed with detailed attention to fuel mixing, distribution and flow. Injector position, angle and port characteristics all play an important role, as well as butterfly and spindle position and shape. In a comparison test by a major manufacturer, Jenvey TH45i twin bodies gave 2% more power than the best from other suppliers. Not a lot, but it all helps, and the rest were left trailing a further 5% by these two (the runner-up was made by us as well!).

Shut angles
The optimum shut angle for a Carburettor butterfly is commonly 12°. This gives good results with regard to idle and progression mixture control and, given the fuelling characteristics of most carburettors, good driveability. With different needs, fuel injection butterflies can use a much smaller shut angle (ours is usually 8°), giving finer control at small throttle openings. This is one of the reasons why adapted carburettor parts, sometimes seen in throttle bodies, can be unsatisfactory.

Bearings
Heat soak into the induction system can raise the temperature of throttle bodies to as high as 140° Centigrade - 100° is common. The spindle bearings must allow for the resulting expansion difference between spindle and casing to prevent risk of the throttles sticking. Ball bearings lack the necessary axial float , whilst nylon - based plastic bushes can suffer from high temperature creep, absorption swelling and wear. Jenvey bodies all use PTFE - lubricated, sintered phosphor - bronze shell bearings which allow expansion float, extreme accuracy, low wear and temperatures over 200° C. Whilst more expensive than alternatives, we believe that this system is essential in the interests of safety and reliable performance.

Copies
We are flattered that our throttle bodies are copied, at least in appearance, by a number of other manufacturers. This, however, does not mean that these imitations are the same thing or that they give the same results.

Pointers
Jenvey throttle bodies are all;

• Backed by rig tests of over 1 million cycles for all major components.
• Backed by a comprehensive accessory, parts and spares service.
• Backed by a total induction system design, tool and make service.
• Proven in use world wide.
• Individually tested before release.
• Designed and developed for performance and reliability.
• Made almost entirely in our own factories.
• Constantly under development.
• Good value: We are the specialists.