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WERK I WERK I is offline
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Join Date: Jan 2003
Location: Wisconsin
Posts: 3,302
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Answer to the first question;
The diameter of the coil wire is different.

The second is using the formula to determining spring rate pressure;

spring rate =

modulus of spring steel X wire diameter4
--------------------------------------------------------------------
8 X number of active coils X mean coil diameter3

Where all other variables are unchanged except for the "number of active coils" (number goes down), a reduction of the divisor, results in an increase in the result.
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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
Old 02-22-2009, 08:05 AM
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