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Registered
Join Date: May 2009
Posts: 127
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Bottom end questions
So I spun a rod bearing yada yada yada. I'm in the process of my rebuild and I'm not sure if I should re-use my crank after having it machined or just find a used one without a spun bearing.
I'll prolly re-use my pistons and most of the bottom end. Also, I'll be putting in an aluminum flywheel. Are these significant changes that might require significant balancing of the crank itself?
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944S --> 944 turbo S - 2.5L Dry Sleeves, K26/8 Turbo, LR Height Adjustable Motor Mounts (-1/2 in.), LR 3 Piece Xmember, LR 3 Piece Xover Pipe, LR Oil Pan Baffle Kit, 930 Clutch, Lightened Flywheel, Custom RX-7 Oil Cooler, Apexi EBC, Tial 38mm Wastegate, Full 3" SFR Exhaust, etc... |
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03-11-2010, 02:01 PM
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Have you found bearings for your new crank/rod dimension? Alignment of the cradle is critical.
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03-11-2010, 08:21 PM
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Az 944 Spec Director
Join Date: Feb 2010
Location: Phx, Az
Posts: 84
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I have seen cranks bent from spun bearings. You need to take the crank to a shop and have them check it out. That is the only way to know it if might be salvageable.
Non-standard rod bearings get very expesive very fast so while they might be able to turn it you need to know what size bearings you will need first. Often you can get a used crank for not much money.
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Joe P. 88 944 Turbo S - 100% Stock 84 - 944 Spec #94 Red/White Arizona Region 944Spec Director Az 944 Spec Champion 02/03, 2006 - 2nd Az Region 944 Spec 03,04,08,09 4th - 2009 NASA Natls - Fastest 944 spec lap at Miller Natls - 2.19.282 (Sat Warm-up) |
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03-12-2010, 05:33 AM
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Registered
Join Date: Jul 2004
Location: Upstate New York
Posts: 3,261
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Make sure that your machine shop completely cleans out the oil passages in the crankshaft. You should have the plugs drilled out so you can clean out the dead ends where the metal accumulates.
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Good luck, George Beuselinck |
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03-12-2010, 06:05 AM
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