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Originally Posted by OBI_agent
yo ksfrogman, awesome info provided! But, I have a question....whats a n51 engine, how does it work and whats its spec? Is it a diesel by any chance?
tc bro.
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The Engine Introduction pdf just about has all the info that we know:
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In order to comply with SULEV requirements, the N51 is another variant of the N52
engine. There are various measures to meet the EPA/CARB standards, some of which
are familiar from the previous SULEV (M56) engine.
Some of the SULEV measures for the N51 include:
• Near engine catalyst with additional underbody catalyst
• Secondary air system
• Optimized combustion chamber geometry in cylinder head
• Modified piston crown for lower compression
• Plastic valve cover with integrated crankcase vent valve and separator (from N52KP)
• Stainless steel fuel lines with threaded connections
• Radiator with “Prem-air” coating
• Throttle system - EGAS08 carried over from N52KP
• Airbox with Activated carbon filter for EVAP control
• Purge system pipes are made from “optimized” plastic
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It is a SULEV-II complaint engine and is not diesel. From what I understand, the N51 is the engine in 328s that are shipped to NY, CA, VT, MA, ME. Basically it adds an extra cat and makes some other changes to meet stricter emissions guidelines.