TURBO HOSES- MATERIAL MATTERS
Turbo hoses can be manufactured with a variety of materials. Various factors dictate the choice of material used. Some of them are:
• NBR/Nitrile: very popular in automotive applications due to its high resistance to petroleum products and ability to operate in medium to high temperatures.
• AEM/Ethylene Acrylic: excellent heat-aging resistance and can also operate in medium to high temperature conditions.
• EPDM/Ethylene-Propylene: provides increased strength and excellent extreme temperature resistance.
• VMQ/Silicone (Fluorosilicone): delivers unparalleled temperature and compression set resistance and is therefore used in high temperature/pressure applications i.e. for vehicles with very high induction charge (boost) pressures.
Turbo hoses generally operate at increased air pressures, so reinforcement fibres, such as polyester, Kevlar and aramid are added to the walls of the hose during their construction.
FAILURE AND REPLACEMENT
As with any rubber product, the material naturally degrades over time. Furthermore, turbo hoses are subject to high levels of stress, which along with contamination from oil and other common automotive chemicals means they will eventually fail and need replacing.
It is important to ascertain if there are any additional factors that may have contributed to the failure. Care should be taken in particular, while installing a new turbo, that the old hoses are checked and replaced, where necessary. This will minimise the risk of contamination and help avoid premature failure.
DON’T FORGET THE HOSE CLIPS
And lastly, a vital area when replacing any hose is the connector.