1uz non vvti Block differences between Series 1 and series 2

CartuneNZ
26 Oct 202213:10

Summary

TLDRIn this video, Calvin from the Catching Company in New Zealand, along with Jason, discusses the differences between Toyota's Gen 1 and Gen 2 engine blocks, specifically focusing on the 1UZ-FE engine. They highlight the changes in block casting, including the introduction of holes in the Gen 2 block for weight reduction and potential harmonic improvements. The discussion also touches on the transition from thick to thin connecting rods and the lighter pistons and crankshaft in Gen 2 engines. The hosts compare various engine components, noting similarities and differences, and speculate on the reasons behind Toyota's design choices without definitive answers, inviting viewer input and further exploration.

Takeaways

  • 🔧 The main difference between a Gen 2 and a Gen 1 block is the presence of additional holes in the Gen 2 block, which makes it lighter.
  • 📅 The transition from Gen 1 to Gen 2 blocks occurred around the 9th month of 1994, with the changes appearing in the USA market in 1995.
  • 🏎️ The Gen 2 block was introduced alongside lighter connecting rods and pistons, enhancing engine performance.
  • 🔩 The change from Gen 1 to Gen 2 is marked by the switch from thick to thin connecting rods, which is also seen in the LS400s and SC400s models.
  • 🏭 The block casting for both Gen 1 and Gen 2 is believed to be the same, with modifications made for specific engine components.
  • 🔧 The Gen 3 or VVT-i blocks further lightened the crankshaft by 1.5 kg and modified the oil galleries.
  • 🧐 The additional holes in the Gen 2 block are speculated to be for block harmonics or windage pressure, although this is not confirmed.
  • 🔍 The script suggests that the Gen 2 block is preferred by some dirt track Speedway racers due to its design.
  • 📏 The block's underside has distinguishing features, such as the presence of holes, which are not found in the Gen 1 block.
  • ⚙️ The script highlights the importance of matching bearing sizes when rebuilding engines, as indicated by markings on the blocks.

Q & A

  • What is the main difference between a Gen 1 and Gen 2 engine block in Toyota's 1UZ series?

    -The main difference is the presence of additional holes in the Gen 2 block, which makes it lighter.

  • Why did Toyota introduce changes in the engine block design from Gen 1 to Gen 2?

    -Toyota made changes to improve the engine's performance, specifically by introducing lighter rods and pistons.

  • In which year did the change from Gen 1 to Gen 2 engine blocks occur in the USA market?

    -The change occurred in the USA market in 1995, registered as 95 year models.

  • What is the significance of the additional holes in the Gen 2 engine block?

    -The additional holes are believed to be for either weight reduction or to change the harmonics of the block.

  • Is there a difference in the oiling and water holes between Gen 1 and Gen 2 engine blocks?

    -No, the oiling and water holes in the top of the engine blocks appear to be the same between Gen 1 and Gen 2.

  • What are the differences in the main cap design between Gen 1 and Gen 2 engine blocks?

    -The Gen 2 has chamfering and no recess, while the Gen 1 has a flat edge with recesses.

  • What is the purpose of the numbers found on the engine blocks?

    -The numbers indicate the bearing sizes fitted at the factory, which can vary and are not necessarily the same across all engine blocks.

  • Why might some engine blocks have different numbers indicating bearing sizes?

    -The different numbers could be due to mass production machining differences, where the factory adjusts the bearing sizes to meet specific tolerances.

  • Are there any differences in the block casting between the VVT-i and non-VVT-i versions of the 1UZ engine?

    -The VVT-i block casting is almost the same as the non-VVT-i, but it has modifications for the oil galleries.

  • What is the significance of the bolt-on drain in the engine blocks?

    -The bolt-on drain is an additional feature compared to the Gen 1 block and is part of the block's design for oil management.

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Engine BlocksToyotaGen 1 vs Gen 2Mechanical ComparisonAutomotive EngineeringPerformance UpgradesCar RestorationTechnical AnalysisEngine ModificationsNew Zealand
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