Between Omaha and Des Moines, 7 miles South of I80 | Bern - 7/1/2021 22:43 I'm curious, what exactly is the "bridge" engine? How is it different than a 6NZ or, on the flip side, an ACERT?
The bridge engine ERA, was the 2003 year mostly(IIRC), where emission standards changed, BUT CAT wasn't quite ready for the ACERT engines (twin turbo, VVA, Emission-compliant for 2003 requirements) to be released and built.
They needed an engine, that was close to the 2003 emission requirement, then just pay the additional fee, to the government, for each "Bridge engine" they sold, that didn't meet the Full 2003 requirements. (or use up any Emission "credits" that CAT had saved)
Basically; an engine, with single turbo, electronic wastegate system, "pilot injection" (extra bump on Camshaft) , different software, and the truck-builders (OEMs) had to install mufflers with a catalyst inside of them. {I know the exhaust system back-pressure spec changed also, it went from 40" (on 6NZ and earlier) to either 50" or 60" on a Bridge engine.}
That engine design (MBN prefix for serial number), was to "Bridge the gap" until the ACERT got be built and fully released.
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2005 Cat 15K acert.
