For sale via this listing is a single unused piston, which has been in my stores for a very long time and always classified until now as 'unknown' but I have now finally put enough effort into the relevant investigations to believe that I may have deduced where it might be put to some appropriate practical use, to match its original design purpose (as a working piston, rather than as a paperweight)

This piston has the following characteristics:

• Markings available on the (flat) crown - "16202", "STD", "ID12" and "MADE IN ENGLAND"
• A built in reference of "16202A" can be seen on the inside of the casting
• The skirt has shallow concave sections below the gudgeon pin hole and opposite each other
• Diameter - (measured) - approx. 3.3/32" (78.58 mm)
• Length (measured) - just under 3.1/8" (79.375 mm)
• Compression height (measured) - approx. 1.3/4" (44.45 mm)
• Gudgeon pin diameter - (measured) - approx. 3/4" (19.05 mm)
• There are four ring grooves, the one for an oil control or 'scraper' ring located above the gudgeon pin presently holds an APEX type of ring, which probably sub-classifies this piston as an example of 16202/PEP

My most recent investigation went something like this:

• Hepolite piston reference 16202 is not findable in any of my Hepolite catalogues and has not turned up via any online enquiries carried out thus far
• The primary features to look out for in combination with each other in a Hepolite piston catalogue from a likely era seemed to be these:
  • Diameter (bore size)
  • Crown shape (1A)
  • Gudgeon pin diameter
  • Number of rings (and width of grooves if deemed absolutely necessary to go that far for double checking purposes)

• Note to the above - the 'wavy' nature of the skirt on this piston is a useful identifying feature but the skirt shape is not something that seems to be deducible from Hepolite catalogues, only the crown shape
• On slowly working my way from A to Z in a 1975 catalogue, it became clear quite soon that the useful feature (for my own search purposes) of this piston is that its gudgeon pin size is relatively unusual (small) at the sort of bore size that it must be associated with
• However, perhaps not atypically, it took me until almost the end of the alphabet to spot something that seemed to be a strong possibilty.........
• ....... which was/is Hepolite 13530 (via Vauxhall uses, I missed the matching Bedford entry)
• A subsequent online search for Hepolite 13530 found an image that showed something very similar to the piston I'm offering here

Hepolite reference 13530 has the following technical details shown in relevant Hepolite piston catalogues:

• Bore - 3.1250", 79.375 mm
• Length - 3.112", 79.045 mm
• Compression height - 1.7950", 45.593 mm
• Gudgeon Pin - 3/4 (19.050)
• Head shape 1A - Flat
• Note - four rings are shown - two compression rings at ring width 5/64 (1.984 mm) and two oil control rings at ring width 3/16 (4.762 mm)

Hepolite 13530 has the following uses

• Bedford 1507 c.c. 4 cylinder - CA 10/15 cwt, 1952/63 (Offset Piston Pin)
• Vauxhall 1507 c.c. 4 cylinder - Wyvern, Victor, VX Four-Ninety, 1952/63 (Offset Piston Pin)
• Vauxhall 2622 c.c. 6 cylinder - Velox, Cresta, 1952/60 (Offset Piston Pin)

Condition report:

• In previous lives, this piston had suffered from a few small dings and dongs along the edge of the skirt; I have fettled those areas back to a reasonably tidy state but further inspection and attention may still be required in that area should this piston ever end up heading into use in a relevant engine
• The rings all seem to be in good condition
• The gudgeon pin was noted to be a bit rusty - that rust, where accessible, has now been scraped away, but the implication must be that some further inspection and rectification attention in that area will be a necessary part of the assembly process for this piston
• Matching circlips are not available (if applicable, although I believe I have detected relevant grooves)

Final note, initially on offset piston pins - a quick test with a suitable deep socket wrench indicated that the pin in this piston is indeed further from one side of the piston than it is from the other, so we are now almost at a stage of QED, although there may of course be certain reasons why Hepolite piston 16202 is not a straight substitute for Hepolite piston 13530, so it's also a case of caveat emptor, much as per usual

Shipping notes - just under 600g, so packabe at under 1 kg; package size estimate 10 cm x 10 cm x 10 cm