Started by kimbill, 08 October 2009, 18:05
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Quote from: kimbill on 08 October 2009, 18:05 My search did not yield an answer .....As a new autostick owner, I've wondered, "What is going on back there?" ... . It would be interesting to know the sequence of operation. In other words, when I move the shift lever, -- this happens.. the points at the bottom of the lever is closed [actuated,] which intern [electrically] causes the control valve to activate the clutch servo, where vacuum from the vacuum tank then operates the clutch for less than a second , while you move to another gear. The engine is pumping Automatic Transmission Fluid all the time the engine is going. Once You release the gearshifter, the torque converter operates thru the clutch into the gearbox/transaxle and drives the wheels.The engine is NOT directly coupled to the Gearbox...The Engine pumps ATF to the torque converter - and the Torque converter Drives the gearbox..When the engine is going , vacuum is taken from the inlet manifold thru the control valve to the vacuum tank..the small vacuum hose going from the carby to the control valve controls the time the control valve opens and closes vacuum to the clutch servo.. [mine came off one day.. and it took about 3-4 seconds for the clutch servo to work]which is a long time when You have just pulled onto a major highway... lol the outside of the torque converter is bolted to the flexplate which is connected to the engine..the ring gear for the starter motor is on the outer edge of the torque converter..The engine does NOT have a flywheel like manual cars. [flexplate instead] [getting too complicated for Me at this time of the morning Bill.. lol]That will keep you occupied for a few minutes... lol LEEI will continue the story later... lol LEE ...... Basically, how does the converter, servo, control valve, carburetor, vacuum lines, ATF pump, and other components interact in each shift cycle? ..... If the subject has been covered, please steer me to it.Bill'71 Ghia
Quote from: volkenstein on 10 October 2009, 13:35 Ladz, In a galaxy far, far away.....sorry, It was a dark and stormy night....The explanation really does need the pretty pictures, also a little about what happens when you start the car (Neutral Safety Switch etc) as the engine creates vacuum in the vac tank until the flapper valve in the CV closes when vacuum is more or less equalised between the engine and vac tank. That's why you can shift a couple of times after you've stopped the engine. The clutch and TC relationship is a little strange compared to fully auto cars and in fact when you think about it....why did VW go with this? Maybe sheer economics? The Saxomat was a proven unit, F & S developed components for it and F & S supplied other components to VW. Who knows? Full Autos (non vw) were around before '68! It would be an interesting read!Maybe something for one of the forums or to replace the "How it works" write up?RegardsSean
Quote from: autonewbie on 10 October 2009, 18:44 From what you have described, I am guessing that other vintage cars might have interchangeable auto stick parts with our VW's.
Quote from: kimbill on 11 October 2009, 05:20 "Remember, if you throw enough money at it, you can make water run uphill (or fix your VW)."
Quote from: autonewbie on 10 October 2009, 18:44 Thanks Bookwus, that is interesting stuff. I really enjoy reading about the history of these aircooled cars. From what you have described, I am guessing that other vintage cars might have interchangeable auto stick parts with our VW's. The downside is probably none of those cars were sold in the same quantities as the VW's so they really won't add to our modern day stockpile of available used parts.