Abstract
The results of 3D SPH simulations (γ = 1.01; γ = 1.1; γ = 1.2) of polytropic accretion disc formation and evolution for the SS Cyg binary system in the quiescent phase, with M 1 = 1.3 M ⊙ (primary) and M 2 = 0.8 M ⊙ (secondary), and a mass ratio M 1 /M 2 = 1.625, are presented and compared with results obtained by Molteni et al. (1991, MNRAS, 235), with M 1 /M 2 = 1. Disc formation seems to be inhibited for γ ≥ 1.1, a value still lower than that found in Molteni et al. This confirms that 2D simulations are meaningless, as they lack z-resolution
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