Archive for the ‘ Air Jacks ’ Category

Air Jacks Fitted

In the run up to the Lotus Festival, we completed the installation of our Air Jack System using ultralight weight Goodridge Kevlar hose and swaged alloy swivel fittings.

The airjacks are Staubli jacks manufactured by Krontec.  We are using the lighter weight 50mm jacks, all that is required for the lightweight Lotus.  We have one centrally mounted in the front of the car, with the other two on the outer sides of the rear chassis legs that extend back into the engine bay.  We designed the mounts ourselves and had them fabricated to our designs by Bob Hall, who runs Concept Racing.  He did a beautiful job (as you can see), making them even lighter than our original designs.  They were bonded in and riveted using Plexus MA 420 Black Structural Epoxy Adhesive; the mounts are now in permanently and can’t be removed.

We then plumbed the system with Goodridge’s top of the line Kevlar ultralight hose system, with swaged alloy fittings not only do they look great but they also weigh almost nothing.  We went to a lot of trouble to get all the fitting angles and orientation correct, although a painstaking job to do, it will pay dividends later when we are endurance racing.

The system is finished off with a qucik release fill and dump valve at the bottom of the screen, this will allow the driver to see the system being activated, and will also keep the lance man clear of the doors and the fuel fill areas of the car.


The Exige requires only 3 airjacks, one at the front due to the light weight and two at the back.  As the Exige has an aluminium structure, the airjacks had to be installed into their own aluminium mountings, which we designed and made to suit the Krontec made Staubli airjacks.  These airjacks are very fast retracting and extremely light as they do not contain an internal spring.  The airjack mounts are bonded onto the chassis and at the rear have a bracket that fits under the chassis to take the load.

Front Air Jack

The airjacks are operated by a fill and release valve which we have placed at the base of the windscreen in front of the driver, where it will not interfere with driver changes or refuelling.  We have plumbed the system entirely in super-lightweight Goodridge PTFE smoothbore Kevlar hose with swaged alloy fittings.  These are more robust than the rigid hard-lines normally used, so are better suited to endurance racing.