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Timing chains are typically a bit noisier than belts.Here's what chains can't do as well as belts: Chains on the other hand give audible warning in most cases if they are going to go bad

Belts typically just snap without warning.Chains on the other hand don't face this sort of an issue I have seen this for myself on a couple of low mileage TDIs. Belts have a tendency to get brittle with age and develop cracks.Chains on the other hand last the life of the engine in most cases (especially petrols) Timing belts have the following drawbacks over chains in my opinion: I believe a timing belt system itself is a step back from timing chains. Here's what BHPian Vishy76 had to say on the matter: But ironically the manufacturer recommends reduced replacement intervals with this new belt.įord's Ecoboost 1.0 and the new Puretech 1.2 by PSA are two engines with wet belt systems sold in India per my knowledge. There's a new belt of another chemistry which is supposedly better. The most common issue is the belt gradually wearing off in the oil and the belt dust settling in the sump and then blocking oil pump intake. The belt in oil has 30% less frictional losses than a timing chain system for a net 1% fuel efficiency gain.īut they don't seem to be very reliable going by the information available on the internet. So they look for avenues to extract the tiniest of efficiency gains from wherever they can and reliability be damned. What I gathered is that this timing belt in oil is not in the interest of the end consumer, these are for the benefit of the manufacturer who has to meet certain emission and fuel efficiency norms on the whole across their product portfolio. For the owners of the Ford 1.8TDCI there is a chain conversion kit available for the wet belt. It seems the Honda and a few others have also joined this wet belt bandwagon. Ford and PSA have collaborated to create a bunch of shared engines in the past so the connection is quite natural. This is not new and seems to have started with the Ford 1.8TDCI engine as a timing belt, but the Peugeot predates the ford in using a wet belt but to drive the fuel pump. BHPian Sankar recently shared this with other enthusiasts.