Assuming both impellers turn at the same RPM and have the same depth then the larger diameter impeller will have about 36% more capacity and eject the snow at about 17% higher speed.
I suspect that there is essentially no difference between 3 and 4 blades.
B&S comes in OHV, Tecumseh is either "L-Head" of OHV. OHV supposedly has more torque than "L-Head". OHV is also supposed to be less noisy. From what Snowman has said the B&S OHV make 50% less noise than the Tecumseh OHV, I think.
Hey Snowman - How can you be 50% quieter? Quiet is no noise, 50% of no noise is still no noise
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This message was modified Oct 14, 2007 by nibbler