Timing chain vs timing belt5/6/2023 ![]() Timing gears have been used for flathead, OHV and even an OHC engine in at least one Honda motorcycle but the distance from the crank to an overhead cam is too large for just a pair of gears so several gears would be needed with consequent loss of timing accuracy due to backlash. ![]() As evidence for that, during the past couple of years I have seen many posts here on CarTalk questioning the need for and the expense of changing a timing belt. Theoretically, a chain can be made to be the longest lasting component.Ī timing belt is a very precise way to time engine parts that require it as evidenced by the successful use by VW for many years to operate diesel fuel injection pumps, the timing of which which is critical to good engine performance and fuel mileage.Īnother reason for the trend to timing chains from belts is that consumers have become more aware of the expense of changing a timing belt that can be avoided with a timing chain. All internal parts that are not routinely replaced or serviced are engineered for compatible life expectancy by each manufacturer according to this engineer. The chain in modern day cars is no more of a durability issue than a connecting rod for a non OHC motor. Maybe increase stress who knows and it’s only a guess for we non engineers. It is not a simple, “which is cheaper/quieter” that the average consumer can only guess at. ![]() The initial move to belts may have been for quietness but with the advent of variable timing and their varied approaches to increased efficiency and power and along with other such technologies the decision was made. It had to do with the motor’s overall performance and planned life expectancy. According to local motor component subcontractor engineer, it’s strictly an engineering decision that is only indirectly related to the cost of making the motor. Toyota and others have gone to chains several years ago in many of their models.
0 Comments
Leave a Reply. |