Ferrari Daytona 365 GTB/4

Vacuum impregnation sealing and pressure testing services

Ferrari Daytona 365 GTB/4

Ultraseal Slough recently had the privilege of sealing the magnesium wheels for one very special Ferrari 365 GTB/4 Daytona that raced in the 1973 edition of Le Mans 24 hour.

Entered into Le Mans by Belgium team Ecurie Francorchamps, the car raced in the 5.0-litre GTS class, finishing 20th overall.

Powered by an operatic 4.4-litre V12 engine that packs 480 hp, the striking yellow Daytona completed the hill climb in 1973 Ecurie 

Francorchamps race livery at last year’s Goodwood Festival of Speed.

As one of only 13 built, the Daytona is a rarity which renowned classic car restorers, and Ferrari specialists, DK Engineering are ensuring stays in excellent, original condition.

To ensure the car is maintained the magnesium wheels that sit under the car’s flared rear arches needed some work.

With a plan to re-paint the wheels, David Cottingham, Founder of DK Engineering knew from experience that to get the best quality end result, sealing the magnesium wheels before painting was the best option.

Light and strong, magnesium wheels offer the performance enhancements a race car demands but magnesium suffers from porosity, which can cause quality issues once painted as the finish can bubble and flake quickly once applied.

However, by sealing any porosity in the magnesium structure DK engineering were able to ensure a high-quality and long-lasting paint finish. 

Ferrari Daytona at the Modena Cento Ore Rally 2018

At the Modena Cento Ore Rally 2018

An additional benefit of sealing magnesium wheels is that it opens up the possibility of using tubeless tyres. Prior to sealing there’s a distinct risk of tyres on magnesium wheels deflating as air escapes through any porosity.

Ultraseal Slough, who have more than 30-years’ experience in sealing classic car cylinder heads, engine blocks and more for the UK’s classic car restoration companies and classic car owners, were chosen to provide the sealing service for DK Engineering.

Sealing porosity in magnesium wheels

Ultraseal’s Slough service centre operates two impregnation sealing systems, both running Ultraseal’s best-in-class sealant. Chemistry and technology that is trusted by automotive OEMs for today’s latest internal combustion engine, electric and hybrid technology as well as a solution for sealing classic car engines and gearbox parts.

Ferrari Daytona magnesium wheels

The Ferrari Daytona magnesium wheels ready to be sealed at Ultraseal Slough

To seal the magnesium wheels, Ultraseal’s Colin Pinkney, places the magnesium wheels in a vacuum module which draws all air out of the part. Sealant is then introduced to fill any voids and leak paths in the wheels. The wheels are then moved through to the next stage where they are rotated to ensure any excess sealant is drained. Colin then hand washes the wheels to ensure they are totally clean and no build-up of resin has occurred. Finally, the wheels are held under a cascade of hot water to polymerise the sealant and set the resin within the porosity. 

A process which ensured the magnesium wheels are in the optimum condition for a high-quality paint finish deserving of the Ferrari 365 GTB/4 Daytona.