I thought double clutchin is what people would do in the old days before synchros, or something. Push the clutch in, pull into nuetral, pull out clutch, push it in again, shift to next gear, and then release the clutch again. Its what you have to do with dog cut gears that don't have synchros. I read in a recent SCC in an article about their subaru Impreza project car. They changed to dog cut gears for a stronger tranny, but since the gears are bigger, there wasn't room for the synchros, so they went into an essay on clutchwork.
<img src="http://www.hyundaiwrc.com/action/photos/thumb/McRae_Shakedown_TNL.jpg" border=0> <img src="http://www.hyundaiwrc.com/action/photos/thumb/bat_hyundai1_sm.jpg" border=0> I love rallies. <img src=icon_smile_big.gif border=0 align=middle>