Delco Remy 55SI™ Ideal for Transit Applications

Today’s mega and charter buses and other commercial transit applications are outfitted with door operation, lighting, AC and other electrical-based amenities. While these ensure a comfortable user experience, they also put a demand on the system and require an alternator that’s up to the job—and the Delco Remy 55SI™ High Output Heavy Duty Brushless Alternator is the perfect solution.
This top performer has been used on specialty vehicles for years—oil rigs, utility trucks, vocational vehicles—and has proven that it can withstand dust, dirt, clay and other debris. Originally geared toward off-road applications, the air-cooled 55SI has been improved to better survive the difficult, corrosive environment encountered in transit  applications where durability and high-output are essential.
Even more, its size, weight and flexibility offer added advantages.

“Traditionally, transit applications have used alternators that are so heavy they require a mechanical lift to install. Plus, they take up a lot of space and are limited on where they can be installed,” explains Rob Steele, Senior Staff Engineer, Alternators. “The 55SI—which I like to refer to as the big brother to our popular 40SI™—is smaller and more lightweight than what’s traditionally been used in this power range. This allows it to be installed by one person. Additionally, it can be used in a single or dual alternator application.”


And have we mentioned its power?
As a brushless heavy duty alternator, the 55SI is one of the highest output air-cooled machines on the market. This power has made it ideal for fire truck applications as well. Available in both 12-volt/430 amp and 24-volt/250 and 275 amp models, it has 33% more output than any other alternator in its class—making it the perfect solution for applications with significant electrical loads.
More Benefits of the 55SI

  • Durable: With a brushless design, the 55SI has fewer moving parts. Fewer moving parts mean less wear and longer life.
  • Smart: The 55SI is equipped with Remote Sense, which can reduce battery charge time by 50%.
  • Efficient: Its high-efficiency output translates to less engine horsepower requirements, resulting in substantial fuel savings.
  • Warranty: 3-year/unlimited miles (Applicable to North America only)

To learn more and to download the product brochure and installation instructions visit our 55SI products page.


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