ripped camel
Dedicated LVC Member
Does anyone know what the crankshaft pulley diameter is on a 97 Mark?
Crankshaft pulley diameter
- Thread starter ripped camel
- Start date
driller
Dedicated LVC Member
The stock crank pulley is 6.75" diameter for all Mark VIIIs.
ripped camel
Dedicated LVC Member
Thank you driller
ripped camel
Dedicated LVC Member
To calculate the alternator shaft speed, which should be no more than 16,000 RPM do the following:
Alternator pulley size (ie 2.5")
Crankshaft Pulley Size (ie 5")
Ratio is 2:1 (5 / 2.5 = 2)
Max engine Speed = 5800 RPM
Multiply Max RPM x Ratio (5800 x 2) = 11,600 shaft RPM Max
Idle RPM = 1000
Multiply Idle RPM x Ratio (1000 x 2) = 2000 shaft RPM @ Idle
An alternator needs 1800-2000 at idle to make power and will make maximum output at 6000 rpm, and will start to fail at 16,000 RPM.
calculation to find out what rpm the alternator will fail at. I'm posting this here so I don't lose it and so others have something to reference from.
Alternator pulley size (ie 2.5")
Crankshaft Pulley Size (ie 5")
Ratio is 2:1 (5 / 2.5 = 2)
Max engine Speed = 5800 RPM
Multiply Max RPM x Ratio (5800 x 2) = 11,600 shaft RPM Max
Idle RPM = 1000
Multiply Idle RPM x Ratio (1000 x 2) = 2000 shaft RPM @ Idle
An alternator needs 1800-2000 at idle to make power and will make maximum output at 6000 rpm, and will start to fail at 16,000 RPM.
calculation to find out what rpm the alternator will fail at. I'm posting this here so I don't lose it and so others have something to reference from.