Re: Purpose of freewheel for Saab trans - Saab Sonett Bulletin Board - Saabnet.com
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Re: Purpose of freewheel for Saab trans
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Posted by Jason [Email] (more from Jason) on Sun, 24 Sep 2000 23:24:41 Share Post by Email
In Reply to: Re: Purpose of freewheel for Saab trans, Jim Williams, Fri, 22 Sep 2000 19:48:38
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I guess I'm still confused about what the freewheel does. My understanding is that the freewheel effectively disengages the engine from the trans, allowing the transmission to ``freewheel'' as the car coasts and the engine to idle independant of the vehicle speed or gear.

In the two-stroke days, then, the freewheel feature would used while the car was in motion, albeit without significant ``driving'' torque (since the engine had already been backed off by the driver.) But from what I've read here (here being this board, not this string of posts), the freewheel is supposed to only be changed on a Sonett while the vehicle is stationary. What you are saying contradicts that, and also makes a lot more sense.

As for the shifting, what I gather is that after cresting a hill in 3rd gear, you ``engage'' the freewheel (disengaging the engine from the transmission.) At that point you are free-rolling, much like you would be if you had the clutch in or the car out of gear. You could then, upon coasting up another hill, put the car into second, put in the clutch and ``disengage'' the freewheel (re-engaging the engine with the trans.) This would involve the shifting that we are discussing now.

I then also assume that this all happened automatically with a two-stoke, via some rods and levers, since to my mind, all this mechanical complexity is still roughly the same as putting the car into neutral while coasting down a hill.

Is this correct? Sorry for all the questions, but this is an odd gizmo.

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