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Date: Tue, 24 Nov 1998 12:08:15 -0800
From: wrdnopsamet.com (William R. Dickson)
Subject: Re: clutchless upshifts


In article <365B2B0E.2931nopsamr.nl.net>, NOSPAMg.velemanopsamr.nl.net wrote: >> >SAABs up to +97 have a freewheel!! Clutchless shiftting, up or down, is >> >as easy as automatic. >> >> How's this work? I'm planning to buy a 96, and the seller mentioned >> freewheel shifting, but I'd never heard of it before... > >The freewheel is a remainder of the two stroke era. If you take your >foot of the gas, a 2stroke engine does not get enough lubrication as the >oil is mixed with the fuel. As in that case (when you take your foot off >the gas - or going downhill) the engine is still driven by the wheels >the pistons are likely to seize. The SAAB people (well, DKW actually) >built the freewheel into the gearbox. The freewheel will disengage the >engine from the gearbox as soon as the 'car is going faster than the >engine'. It works with spring loaded rollers that lock inside a >cylinder. >So, it works like an automatic clutch; take your foot off the gas, the >gearbox disengages from the engine, and you can shift up or down without >depressing the clutch. However, if you want to stop the car you will >either have to put it in neutral, or deprees the clutch anyway. Thanks for the explanation. I'm told that on the 96 V-4's, it's possible to select whether you want freewheeling on or off. With the V-4 I gather there's no benefit to the engine if you have freewheeling on, but that it might be easier on the transmission. Any recommendation on that? And with freewheeling on, is shifting with or without the clutch preferable, or does it make no difference at all? Thanks again, -Bill -- William R. Dickson -- Consuming the Earth's limited resources since 1968 wrdnopsamet.com <> http://www.awenet.com/~wrd/ <> VNB3T, VSC1T, VSX1T The longer I live the more I see that I am never wrong about anything, and that all the pains that I have so humbly taken to verify my notions have only wasted my time. -George Bernard Shaw

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