Allison Readies Its Super C20R Retrofit Kit
A retrofit kit upgrading Allison 250-C20R engines is scheduled to be available in early 1998. Allison says the Super C20R mod increases hot-day power by up to 20 percent and reduces fuel consumption by up to 10 percent. Allison also is working on a Model 250-C21 with a 500-hp gearbox and a -C22 with...
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