Listeroid , the non-rotating tappet
I have found four Indian Brands (so far) that have tappets that don't rotate, this drives me crazy. Some folks suggest a tappet can live a long time without rotating when spring pressures are this low, especially with a mushroom tappet. In a 'stand by' application, this may be true, "engines don't wear much when they're not running". It certainly will take some time for the CAM LOBE to wear down the tappet face and cut a big ole grove in it. But shouldn't we be concerned about the CAM LOBE too? If we think about this, we are losing lift and duration as these third world finishes battle it out. This means a loss in efficiency meaning you are burning more fuel per hour to accomplish the same work. If you are not moved by this, what about the by product of these surfaces coming together? Second only to casting sand contamination, ferrous metal that wears off the tappet faces and cam lobes are run thru your bearings and bushings and some of it is imbedded in the softer metal of bushings, and bearings, and abrade the critical surfaces like the crank pin. you now have a contaminated engine that will live a short life.
Besides losing efficiency with the loss of cam lift and duration, it is estimated that there is an additional 6% loss in performance running these poor third world finishes compared to the typical finishes the rest of the world has come to expect. this is extra heat the engine has to dissipate, and it is energy that could have been used to do real work. Are there really companies in India that build a superior product?
Learn what it takes to make these engines live and perform, learn what you should know before you buy a Lister or Listeroid.
I am in the process of reviewing another brand of 'STANDARD' Listeroid. For the time being, my focus is on Listeroids that accept STANDARD parts that have been sold for sixty plus years. These engines have proven their efficiency, and parts will be made for decades to come... that is a comfort at this time. The newer designs will have to prove themselves, they may be good, but will you find parts 30 years from now? It's my bet that the standard parts will still be on the shelf for your Grandchildren to buy. You won't find all of them at NAPA, but they'll be all over the third world. Funny thing; I was watching National Geographic, a Special about a group of North African People who some how managed to exist in the middle of a very harsh landscape. They had a Listeroid 6/1 that powered their well pump, the engine was described as 'ancient'. Other than the Lister and Pump, it was Mud huts, goats, and a near barren wasteland. I guess the National Geographic folks have no clue you can still buy a new Listeroid.
All the best!