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- Q17098352 subject Q8751940.
- Q17098352 subject Q9577154.
- Q17098352 abstract "A junk head is a form of piston engine cylinder head, where the head is formed by a dummy piston mounted inside the top of the cylinder. In most other engine designs, the cylinder head is mounted on top of the cylinder block. That form has also been termed a "poultice head".It is obviously essential for any piston engine to seal the joint between block and head. This is usually done by means of a head gasket, a flat gasket on the surface of the block. In early engines, the high pressures and high temperatures made this a difficult trial for the materials of the day and gasket failures were common. The junk head requires no head gasket and is sealed by piston rings inside the cylinder bore, as for the power piston.An alternative solution was the monobloc engine, where the block and head were formed as one piece. This solved the sealing problem, but complicated manufacture and maintenance. Particularly when routine maintenance still required frequent head removal for de-coking, on a monobloc engine this required the removal of the pistons from the crankshaft end beneath.Cooling is difficult with a junk head, with either air or water. Water ports must be connected to the removable head and there is little space available within the cylinder diameter. If the engine uses the common form of overhead poppet valves, these would also be difficult to fit inside the limited space. Air cooling is also difficult, as the shape of the head is deeply re-entrant and it is difficult to arrange airflow to the deep well around the spark plug or injector. Bristol developed a two-part head to address this problem, with copper conducting fins.".
- Q17098352 thumbnail Knight_sleeve-valve_engine,_sectioned_head,_inlet_stroke_(Autocar_Handbook,_Ninth_edition).jpg?width=300.
- Q17098352 wikiPageWikiLink Q1127214.
- Q17098352 wikiPageWikiLink Q1132541.
- Q17098352 wikiPageWikiLink Q12760.
- Q17098352 wikiPageWikiLink Q1753786.
- Q17098352 wikiPageWikiLink Q1944962.
- Q17098352 wikiPageWikiLink Q1964929.
- Q17098352 wikiPageWikiLink Q214098.
- Q17098352 wikiPageWikiLink Q217312.
- Q17098352 wikiPageWikiLink Q245657.
- Q17098352 wikiPageWikiLink Q245678.
- Q17098352 wikiPageWikiLink Q3071757.
- Q17098352 wikiPageWikiLink Q45227.
- Q17098352 wikiPageWikiLink Q5309.
- Q17098352 wikiPageWikiLink Q654907.
- Q17098352 wikiPageWikiLink Q718781.
- Q17098352 wikiPageWikiLink Q7201343.
- Q17098352 wikiPageWikiLink Q781096.
- Q17098352 wikiPageWikiLink Q8751940.
- Q17098352 wikiPageWikiLink Q953477.
- Q17098352 wikiPageWikiLink Q9577154.
- Q17098352 comment "A junk head is a form of piston engine cylinder head, where the head is formed by a dummy piston mounted inside the top of the cylinder. In most other engine designs, the cylinder head is mounted on top of the cylinder block. That form has also been termed a "poultice head".It is obviously essential for any piston engine to seal the joint between block and head. This is usually done by means of a head gasket, a flat gasket on the surface of the block.".
- Q17098352 label "Junk head".
- Q17098352 depiction Knight_sleeve-valve_engine,_sectioned_head,_inlet_stroke_(Autocar_Handbook,_Ninth_edition).jpg.