Some Diesel engines use swirl flaps on four-valve cylinders. They close one of the two inlet ports at low load, while the remaining port lets the air circulate into the cylinder to create a swirl – hence the name. This improves emissions and fuel consumption.
The area of the swirl flaps is sensitive though, and there have been various problems in the field. On one family of engines the swirl flaps are mostly OK. But the rod, which connects the swirl flaps, often falls off. The officially suggested repair is to replace the entire inlet manifold, and since half of the engine needs to be disassembled for this, the repair costs a fortune. In fact, the quote for a new manifold on an Opel Astra was the reason to develop SwirlRepair.
We now offer a repair kit for the original rod as well as complete and improved rod assembles, which come fully mounted and ready to install.