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Registered
Join Date: Jul 2005
Location: Cleveland, OH
Posts: 1,370
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Valve spring height... 930 w/ 964 cam
Was reading that the valve spring height is supposed to be changed depending on what cam you're running. If I'm running a 964 cam in a 930, what should spring height be?
930 spec is 33.5 +/-0.3mm |
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12-01-2005, 04:48 AM
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Registered
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34.5 inlet and exhaust
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Andy 1980 SC soon to be big hp 3.3t powered 73RSR Replica (well, I'm keeping the engine but everything else is going  )
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12-01-2005, 08:47 AM
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Wo ist die Rennstrecke?
Join Date: Mar 2004
Location: St Johns, FL
Posts: 1,210
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Double check this. I installed my springs per factory, installed the super C2 cam and bent the intake valves due to the spring binding. I ended up getting JB Racing springs and set the springs using seat pressure rather than height, giving me enough clearance.
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12-01-2005, 10:57 AM
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Forced Induction Junkie
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Isn't the recommended spring clearance (between windings) supposed to be something on the order of .015" at the maximum lift at lobe center?
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Dave '85 930 Factory Special Wishes Flachbau Werk I Zuffenhausen 3.3l/330BHP Engine with Sonderwunsch Cams, FabSpeed Headers, Kokeln IC, Twin Plugged Electromotive Crankfire, Tial Wastegate(0.8 Bar), K27 Hybrid Turbo, Ruf Twin-tip Muffler, Fikse FM-5's 8&10x17, 8:41 R&P |
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12-01-2005, 12:19 PM
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Registered
Join Date: Jul 2005
Location: Cleveland, OH
Posts: 1,370
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Hmmm... All things being equal, I would think it may be 2mm longer than stock based on lift, but really don't know how much room is avail between coils on stock setup.
intake exh 930 0.376 0.346 964 0.464 0.426 delta 0.088" 0.080" |
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12-01-2005, 05:08 PM
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1985 Porsche 930 Fac. Slantnose 3.3l
