| Also known as | E3960 |
| Diagram | Fig. 1 — CRANKSHAFT, PISTON AND TIMING GEARS · ref 19 |
| Subsystem | engine bottom |
| Listed in parts books | 1963–1964 |
Taper compression ring
A taper-faced compression ring for the piston, listed under Triumph part number 70-3960 (formerly E3960).
This is a taper compression ring, catalog number 70-3960, also listed under the older E3960 designation. It shows up in the parts books alongside the crankshaft, piston, and timing gear listings, which is where the piston ring sets live in the catalog structure.
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A taper compression ring is one of the ring set fitted to the piston, working to seal combustion pressure in the cylinder while helping control oil control up in the ring pack. Beyond that, our records don't give us a bore size, ring width, or specific model tie-in for this one.
Our catalog entries for this part run from 1963 to 1964, but that's just the span across the rows we have on file, not a confirmed model fitment. Bring in your piston or check your bore diameter before ordering, and call the shop if you want to talk through fitment.
We've never carried this one. Tell us what you're after and we'll go looking — you'll get a price and photos before you commit to anything.
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