13-03-2019, 03:07 AM
(This post was last modified: 13-03-2019, 03:12 AM by Bob Culver.)
In the absence of any other info always ran .004 valves. Life was short but that was normal on old materials.
If not fully closing should be evident on the handle hot. Moderns overlook that marvellouse diagnostic tool.
Dunno what modern valves made of, but most modern materials have higher expansion. Does not matter if stems of separate material. Clearance has a surprising effect on valve duration.
Fuel starving can show in various ways. On another make due restricted float movement car would abruptly cut at medium speed on the flat but OK uphill! Try blowing back thru the pipe.
If not fully closing should be evident on the handle hot. Moderns overlook that marvellouse diagnostic tool.
Dunno what modern valves made of, but most modern materials have higher expansion. Does not matter if stems of separate material. Clearance has a surprising effect on valve duration.
Fuel starving can show in various ways. On another make due restricted float movement car would abruptly cut at medium speed on the flat but OK uphill! Try blowing back thru the pipe.