Date: Thu, 26 Nov 1998 21:34:44 +0100 From: "Edmund Blackadder" <israelssonnopsamnet.se> Subject: Re: clutchless upshifts
William R. Dickson skrev i meddelandet ... >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 > The advantage is lower gas consumption as you can lift your foot of the gas when going downhill. You donīt have to shift as often in city. /Edmund '75 96V4 >-- > 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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