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Topic: Tech: SBC Cast Crankshaft Flange
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Page 1 of 1 of 3 replies
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January 01, 2016 at
04:10:05 PM
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Joined:
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01/01/2016
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Good Afternoon All. I have a tech question about a stock SBC Cast Crankshaft. In some of the "spec" lower hp sprint classes around the country I know some people still use stock cast crankshafts in their race engines. I am curious as to if every stock cast crankshaft needs the rear flange machined to fit inside the motorplate hole and torque ball housing (i know without the machining that sometimes the flange will rub on the inside of those)? I had measured from the rear of a stock cast 305 crankshaft that had been machined and the largest diameter of the flange was 4.9". I am also curious as to what the maximum diameter of that flange could be for it to still fit without any machining done to the motor plate and torque ball? Thank you.
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January 01, 2016 at
04:58:41 PM
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11/02/2013
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539
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A subsequent question for you. Are we talking about a motor using a one or two piece rear main seal? Flanges are different betweeN the two.
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January 01, 2016 at
06:04:26 PM
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Reply to:
Posted By: kossuth on January 01 2016 at 04:58:41 PM
A subsequent question for you. Are we talking about a motor using a one or two piece rear main seal? Flanges are different betweeN the two.
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Two Piece Rear Seal
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January 02, 2016 at
07:16:38 PM
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07/25/2012
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47
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Reply to:
Posted By: loudwire on January 01 2016 at 04:10:05 PM
Good Afternoon All. I have a tech question about a stock SBC Cast Crankshaft. In some of the "spec" lower hp sprint classes around the country I know some people still use stock cast crankshafts in their race engines. I am curious as to if every stock cast crankshaft needs the rear flange machined to fit inside the motorplate hole and torque ball housing (i know without the machining that sometimes the flange will rub on the inside of those)? I had measured from the rear of a stock cast 305 crankshaft that had been machined and the largest diameter of the flange was 4.9". I am also curious as to what the maximum diameter of that flange could be for it to still fit without any machining done to the motor plate and torque ball? Thank you.
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The failsafe method I would suggest is cut the crankshaft flange to match the u joint flange O.D. It could save you some trouble when using some of the steel torque ball housings. I have seen clearance issues with cut stock cranks that clear the motor plate and most cast type torque ball housings, but don't clear some steel torque ball housings. Hope this helps. Hope you have fun when you get her going!
Peril, not variety, is the true spice of life.
J. Cooper
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