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Product Announcement: New Lost Motion Assemblies for the J-Series V6 from P2R

  • Posted: 01-19-2017 03:45 PM
  • Engine

P2R Lost Motion Assembly (LMA) will replace the factory Piston style LMA found on the 01-03 J series like the J32A2. They will also fit the 04+ J series. The LMA is designed to pre-load the VTEC rocker when the VTEC is off. The P2R LMAs are designed and produced to the highest quality standards using hardened tips and have been WPC friction treated to give extra wear resistance. Sold as a set of 6. These have been tested and proven to work in P2R's race cars over the last several years.


P2R P354 Lost Motion Assemblies for the Honda J30/J32/J35/J37 Honda V6.


To understand a little more about what this does you need a little understanding of how VTEC works. Basically, normally an engine uses multiple cam profiles for a given set of cylinder valves. So on a 4 valve head with a single overhead cam configuration, there is a set of cam lobes for the intake side and a set for the exhaust side. VTEC incorporates a second set of lobes on the intake side which have a different profile for a higher performance level. All these lobes have their own rockers, and the engine "switches" the cam profile by locking the rockers together (using oil pressure). 

As you can imagine, when the "low" rockers are on, the high rocker is just freewheeling against the cam not doing any work. Once the rockers are locked together, the "high" cam lobe actuates the "low" rockers. This usually happens at mid-range RPM and is computer controlled.

When the RPMs, VTEC disengages the high cam rocker from the low rockers, and you are in "low mode" again. These LMAs dampen and preload the "high" cam rocker because unlike the low rockers, it does not have a valve to counteract it's movement when cam actuates it.

Make sense? If not, give us a call! 949-295-1668, and we can chat about it!

About the Author

Marcus di Sabella Marcus is the founder of Heeltoe Automotive. He's been working with cars (mostly Honda cars) since 1996, and has been providing enthusiasts with excellent products, services, and web experiences since 2002. He's been published in Honda Tuning, and holds a degree in Engineering Technology.


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