Installed new Throttle Cable and worked through the mechanical sync procedures.
Attempting Carb Sync with Carbtune (2-column) vacuum gauge marked in centimeters of mercury (cm-Hg). Have also double-checked for leakage opportunities in the hose connections.
This is what I?m seeing in the engine runs:
Left carb shows 2 cm higher vacuum at 2000 rpm idle (Left side ? 24cm, Right side ? 22cm)
Both sides show equal vacuum at 3500 rpm.
As throttle advances above 3500 the Left side vacuum decreases more rapidly until it?s about 1.5 cm less than the Right side at which point that the bars disappear off the lower end of the scale around 4800 rpm.
It's puzzling to see the Left Side vacuum Higher at idle and "cross over" to read lower at high power. Anyone else seen this? Nevertheless...
Question: How close is ?close enough? i.e. how much differential will the Compensator Tube between the carburetors ?compensate? for? According to my calculations a 2cm differential is about 2.5% of one standard atmosphere which doesn?t sound like much. However, if the gauge is accurate that 2 cm is around 9% of the lower of the 2 vacuum readings at idle. The 1.5cm differential would be about 20% of the 8cm indicated vacuum at high power.
Will appreciate any comforting words, advice, or recommendations to address the differences.
Sincere thanks as always.
Attempting Carb Sync with Carbtune (2-column) vacuum gauge marked in centimeters of mercury (cm-Hg). Have also double-checked for leakage opportunities in the hose connections.
This is what I?m seeing in the engine runs:
Left carb shows 2 cm higher vacuum at 2000 rpm idle (Left side ? 24cm, Right side ? 22cm)
Both sides show equal vacuum at 3500 rpm.
As throttle advances above 3500 the Left side vacuum decreases more rapidly until it?s about 1.5 cm less than the Right side at which point that the bars disappear off the lower end of the scale around 4800 rpm.
It's puzzling to see the Left Side vacuum Higher at idle and "cross over" to read lower at high power. Anyone else seen this? Nevertheless...
Question: How close is ?close enough? i.e. how much differential will the Compensator Tube between the carburetors ?compensate? for? According to my calculations a 2cm differential is about 2.5% of one standard atmosphere which doesn?t sound like much. However, if the gauge is accurate that 2 cm is around 9% of the lower of the 2 vacuum readings at idle. The 1.5cm differential would be about 20% of the 8cm indicated vacuum at high power.
Will appreciate any comforting words, advice, or recommendations to address the differences.
Sincere thanks as always.