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  1. Engine Repair, Diagnostics & Rebuilding
    Dear Community, I ask your opinion, experience with motronic pistons. As far as I’m informed, my pistons are called motronic, they are used Borgos (I think), with the number 3547 stamped in the inside and 6477\E stamped on the top of them, see pictures. I would like to use them in my 2 liter...
  2. Spider - 105 & 115 Series (1966-1994)
    I have rebuilt my engine twice in the last three years, and continue to have a problem with sealing the rings. Both rebuilds have used the Motronic 10.1 pistons. My machine shop has measured the piston to liner clearance as 5 thousandths inch. The specifications call for less than 2...
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