Fupower Custom Auto Parts Manufacturer - Best Racing parts manufactuer in China
The reinforcement layer is what stops the hose deforming under pressure, and it is chosen by application rather than by preference. A polyester fabric ply is the standard choice and covers most turbo boost and coolant duties. Nomex is a heat-resistant aramid fabric, used where the hose runs close to a turbocharger or a manifold and the reinforcement itself would otherwise be the first thing to degrade.
Stainless steel wire reinforcement is used when the hose must also resist collapsing under vacuum, or hold its shape on a long unsupported run. Braided stainless on the outside is a separate matter — that is abrasion protection, not reinforcement. Fupower makes hose with polyester, Nomex and stainless wire construction, and can combine them where one run has to satisfy more than one requirement.
When the inside of the hose sees oil or fuel vapour rather than only air or coolant. Standard silicone is a poor host for hydrocarbons: oil mist migrates into the wall over time, the rubber swells and softens, and the hose can delaminate from the inside out — a failure that a visual inspection from the outside will not catch.
A fluorocarbon-lined hose puts an oil-resistant layer against the medium while the outer wall stays silicone, so the flexibility and heat range are kept without the swelling. On a turbo engine the usual candidates are crankcase breather hoses, turbo oil feed and drain areas, and any charge pipe downstream of a PCV outlet. Fupower builds fluorocarbon-lined silicone hose for exactly these positions.