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This is from a 07 Saturn Aura, so it might differ a bit from others. I can add whatever needs to be added to this, just let me know.
...08-20-2024, 03:31 PM -
Too many resources have shown the rod length to be 5.9" for both motors. We have known for a long time that the 3900 LZ9 rod is 5.827" long from measurements, but the LZ4 was kind of a mystery even now in 2023. Maybe its out there, but most people want to build the bigger motor. However, there is something more to these motors than to think of them like bigger 2.8/3.1 motors. Unlike the 2.8 and 3.1, the difference is the stroke and rod, not stroke and pistons.
Having both...05-27-2023, 06:52 AM -
3900 Engine Mechanical Specifications Application Specification Metric English General Data Engine Type 60 degree V-6 Displacement 3.9L 238 cu in RPO LZ9 VIN 1 Bore 99 mm 3.90 in Stroke 84 mm 3.31 in Compression Ratio 9.8:1 Firing Order 123456 Sp...09-29-2010, 08:27 PM