Dyno Testing - Dyno Testing Information

Purposes and benefits
of Dyno Testing

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of our dyno testing facility

The first few hundred kilometres of a re-manufactured engine's life is critical and will have a major impact on how strongly that engine will perform, how much oil it will consume and how long it will last. The main purpose of bedding-in is to seat the compression rings to the cylinder walls and this means the physical mating of the engine's piston rings to it's corresponding cylinder wall. That is, we want to physically wear the new piston rings into the cylinder wall until a compatible seal between the two is achieved.

Proper engine bedding-in will produce an engine that achieves maximum power output with the least amount of oil consumption due to the fact that the piston rings have seated properly to the cylinder wall. When the piston rings are broken in or seated, they do not allow combustion gases to escape the combustion chamber past the piston rings into the crankcase section of the engine. This lack of "blow-by" keeps the engine running cleaner and cooler by preventing hot combustion gases and by-products from entering the crankcase section of the engine. Excessive "blow-by" will cause the crankcase section of the engine to become pressurized and contaminated with combustion gases, which in turn will force normal oil vapours out of the engine's breather, causing the engine to consume excessive amounts of oil.

In addition to sealing combustion gases in the combustion chamber, piston rings must also manage the amount of oil present on the cylinder walls for lubrication. If the rings do not seat properly, they cannot perform this function and will allow excessive amounts of oil to accumulate on the cylinder wall surfaces. This oil is burned each and every time the cylinder fires. The burning of this oil, coupled with "blow-by" induced engine breathing, are reasons that an engine that hasn't been broken in properly will consume more than its share of oil.
Contrary to some opinion, gentle engine operation and the use of low power settings does not expand the piston rings enough, and a film of oil is left on the cylinder walls. The high temperatures in the combustion chamber will oxidize this oil film so that it creates glazing of the cylinder walls. When this happens, the ring bedding-in process stops, and excessive oil consumption frequently occurs. The bad news is that extensive glazing can only be corrected by removing the cylinders and re-honing the walls. This is expensive, and it is an expense that can be avoided by proper bedding-in procedures. Dynamometer testing is the safest method of achieving this.

Any engine operational problems or faults that may become apparent during our dyno testing can be rectified immediately and this ensures that at the time of delivery to the customer, we can guarantee that the complete engine is going to be able to be put to work without undue concern.