After having bought a diesel compression gauge - not the motometer one unfortunately- I find I always got low compression values - around 16 bar. The instrument has a long ( 430 mm ) 1/4 " ID pipe going to the non-return value which is at the base of the gauge. Well I did some calculations and the volume of the pipe leading up to the gauge is about 13.8 cm3 ! When compared to the combustion chamber volume of around 27.2 cm3 it is quite significant as the pipe volume can be considered as part of the combustion chamber . This reduces the effective compression ratio to about 14.6! - no wonder the pressures are always pretty low. Are my assumptions correct ? Does the motometer instrument have the non return valve at the "engine" end ?
Peter _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
