01-12-2019, 08:42 PM
As Chris KC implied, I trust open throttle is being used.
Compression testers only became common when crank handles disappeared. Reveal little that the handle cannot.
The indication of compression is variable. At one stage my Seven had quite good compression but .010 taper and burned oil in vast quantity. Failing valves had a marked effect on performance but were immediately apparent on the handle.
For 30 years and 150,000 miles my 1964 1600cc car had handle compression less than the Seven! Eventually replaced broken rings and very springy comp obtained. Blow by eliminated, idling much improved and slow speed pulling, but performance at normal touring revs, economy much the same. Oil consumption reduced but was always low.
Consistent much reduced compression could be associated a gross cam timing error. Very easily approximately verified as valves "rock" about 8 deg after tdc.
Compression testers only became common when crank handles disappeared. Reveal little that the handle cannot.
The indication of compression is variable. At one stage my Seven had quite good compression but .010 taper and burned oil in vast quantity. Failing valves had a marked effect on performance but were immediately apparent on the handle.
For 30 years and 150,000 miles my 1964 1600cc car had handle compression less than the Seven! Eventually replaced broken rings and very springy comp obtained. Blow by eliminated, idling much improved and slow speed pulling, but performance at normal touring revs, economy much the same. Oil consumption reduced but was always low.
Consistent much reduced compression could be associated a gross cam timing error. Very easily approximately verified as valves "rock" about 8 deg after tdc.