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sleevevalve

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About sleevevalve

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  • Birthday 09/07/1964
  1. I wondered about that term, too. For once, the internet provides an answer (from Wikipedia): "The term "junk head" originates from these sealing rings or "junk rings". The term was previously in use with steam engines. Whereas a piston ring must slide within the cylinder and so be made of the best quality long-lived materials, where a fixed cylinder cover was sealed by a ring, this stationary ring could be of the lowliest materials or "junk", often a greased or graphited rope or oakum packing. Although the high cylinder temperature of an internal combustion engine requires high quality materia
  2. Good to see that the big Minerva´s oil consumption lines up with that of my car! The photo shows a new junk head (rings still to be fitted) and it can be clearly seen in the old drawing. The rings of course tend to wear out quickly as lubrication at this point must be erratic at best. Mr Saxton´s advice is genuinely helpful. One quart in 1000 miles - I guess this is quite excellent for ANY vintage car engine. Of course there are plenty of jokes (funny and not-so-funny) dealing with "smoky" sleeve-valve cars.... just make sure you never get stuck behind one on the road.
  3. This one? Further information on the inline-12: please see Automobiles Voisin - V12 L
  4. This one spent most of its life in France (where I bought it in 2001). It is licenced for road use but gets exercised on a limited scale only – approx 1500 km per year – cars this old are not ideally suited for today´s traffic. This car neither has a water pump nor a ventilator so it isn´t too happy in traffic jams. The interior has been re-done with the infamous art-deco Voisin cloth, faithfully replicated to match the original. Bear in mind that this pattern also was available in bright red – a sight which may seriously damage one´s retina: sunglasses are a good idea ! In comparison the blue
  5. „Occasional“ in this case is one pint every 100 miles. As previously stated in this thread, oil consumption mostly depends on the condition of junk heads and rings. Choosing the correct type of oil also helps... somewhat. Voisin´s inline-12 engines are poorly documented. Most likely only two were built (one 4.6-litre and a 6-litre) and photographs are scarce. Frankly, I´m inclined to believe these beasts were not Voisin´s brightest idea – rather, an expensive way to find out about possible effects of crankshaft torsional vibration!
  6. Standard-issue, basic factory four-door on the 2.3 litre chassis. Fancy streamliners like the Aerodyne and Aerosport only appeared in the 1930´s and only a handful were built.
  7. It might be interesting to note that Voisin, unlike most other small manufacturers, used only very few parts from external suppliers: wheels, electrical system, instruments, radiators – that´s about it. Everything else was designed and manufactured in-house, down to minor stuff like door handles and cast-alloy side lights. I bought a Voisin some 12 years ago; its restoration caused lots of grey hair due to the non-availability of spare parts and detailed technical information, as expected on any „exotic“ vintage car. The car is on the road since 2009 and rather trouble-free – just add petrol a
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