clearance for aluminum rods..
10-02-2012, 03:04 PM
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clearance for aluminum rods.. hey guys, i'm rebuilding my sb 434 ci, and checked for clearances my rods are all aluminum and found they have around .0025" of clearance, what are the numbers for aluminum rods? it is a drag car working around 5500-7200 rpm
10-03-2012, 01:04 AM
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10-03-2012, 12:42 PM
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Found this:
http://www.rrconnectingrods.com/alum...inum-rods.html
What clearances do I need to run with an aluminum rod?
When running an aluminum rod, your running clearances need to be adjusted as the aluminum rod will grow more than a steel rod. A piston to head clearance of .060" minimum is recommended. Sides clearances need to be increased by .002-.005" over the steel counterpart depending on application and oil viscosity used. Wrist pins typically need to be run tighter than their steel counterpart as the heat from the piston transfers to the rod and increases running clearances during operation. Rod bearing clearances typically are run .001-.002" looser than with steel rods as the parting lines tend to burnish into each other during initial operation. Aluminum rod to camshaft and engine block clearances should also be kept to a minimum of .060".
http://www.rrconnectingrods.com/alum...inum-rods.html
What clearances do I need to run with an aluminum rod?
When running an aluminum rod, your running clearances need to be adjusted as the aluminum rod will grow more than a steel rod. A piston to head clearance of .060" minimum is recommended. Sides clearances need to be increased by .002-.005" over the steel counterpart depending on application and oil viscosity used. Wrist pins typically need to be run tighter than their steel counterpart as the heat from the piston transfers to the rod and increases running clearances during operation. Rod bearing clearances typically are run .001-.002" looser than with steel rods as the parting lines tend to burnish into each other during initial operation. Aluminum rod to camshaft and engine block clearances should also be kept to a minimum of .060".
10-03-2012, 04:14 PM
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Found this:
http://www.rrconnectingrods.com/alum...inum-rods.html
What clearances do I need to run with an aluminum rod?
When running an aluminum rod, your running clearances need to be adjusted as the aluminum rod will grow more than a steel rod. A piston to head clearance of .060" minimum is recommended. Sides clearances need to be increased by .002-.005" over the steel counterpart depending on application and oil viscosity used. Wrist pins typically need to be run tighter than their steel counterpart as the heat from the piston transfers to the rod and increases running clearances during operation. Rod bearing clearances typically are run .001-.002" looser than with steel rods as the parting lines tend to burnish into each other during initial operation. Aluminum rod to camshaft and engine block clearances should also be kept to a minimum of .060".
http://www.rrconnectingrods.com/alum...inum-rods.html
What clearances do I need to run with an aluminum rod?
When running an aluminum rod, your running clearances need to be adjusted as the aluminum rod will grow more than a steel rod. A piston to head clearance of .060" minimum is recommended. Sides clearances need to be increased by .002-.005" over the steel counterpart depending on application and oil viscosity used. Wrist pins typically need to be run tighter than their steel counterpart as the heat from the piston transfers to the rod and increases running clearances during operation. Rod bearing clearances typically are run .001-.002" looser than with steel rods as the parting lines tend to burnish into each other during initial operation. Aluminum rod to camshaft and engine block clearances should also be kept to a minimum of .060".
