07-05-2019, 07:41 AM
Many textbooks publish graphs of the pressure in a cylinder. With advanced spark the peak pressure increases dramatically; out of all proportion to any slight power gain. (Somewhat the same applies to c.r. increase. both excessive advance and raised cr are hard on poorly supported cranks. No more advance than necessary for full power should be used, and often a little less is prudent) ) If the engine actually pings pressure waves sufficent to make the metal ring as if struck by a hammer occur. So excess advance does increase the risk but any head gasket in any car should withstand.
There seems to be some doubt about the properties of modern asbestos free gasket materials. I wonder if excessive tightening as often advocated crushes all the resilience out of the gasket. Years ago it was normal to repeatedly reuse gaskets. I always did so on the Seven and makes I operated and never had one blow (although few came off without staining in parts).
There seems to be some doubt about the properties of modern asbestos free gasket materials. I wonder if excessive tightening as often advocated crushes all the resilience out of the gasket. Years ago it was normal to repeatedly reuse gaskets. I always did so on the Seven and makes I operated and never had one blow (although few came off without staining in parts).