Originally Posted by
danyvw
That's not true. Not all turbo glow plugs fit in all engines, just try to put a Nova plug in a modern Picco and the engine will have a leak, if you tighten a little bit you'll get a nice head button broken (a $40.00 mistake)
That has nothing to to with the taper.... Novarossi is the only one having the M8x0.75 thread running up to the start of the taper while all other plugs have the thread stopping 2mm before the end and some have even a smaller end tip.
Putting a novarossi plug into another brand engine you need to use some force to screw it up to the end and what you are actually are doing is screwing a part with thread into a part w/o thread and that will damage a part of the sealing construction.
So far I have seen can any other plug be used in any engine.