Shifting fun ............

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11 Aug 2016 21:43 #31506 by 1748 S
1748 S replied the topic: Re: Shifting fun ............
here's the solenoid vacuum valve block. If more pics are required please ask and I will make them.

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12 Aug 2016 08:45 #31513 by
replied the topic: Re: Shifting fun ............
Thanks for the pictures!
I've done a couple of tests. With the engine running,wheels off the floor, car in neutral,foot off the clutch.

Selector switch to second gear,
depress clutch, instant vacuum approx 7,5 psi.
Off clutch, instant atmospheric pressure.

Any other gear, same result.

Looks like the vacuum block is doing ok ?

Thanks for the pictures
Frank

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13 Aug 2016 22:27 #31524 by ilikescars
ilikescars replied the topic: Re: Shifting fun ............
Still on shifting subject: I've been having fun driving around in the 812. Seems to shift better if I pre-select, depress clutch, "goose" the gas petal a little and then release clutch. Maybe that extra "goose" helps increase vacuum a little, I'm guessing. Also, the car seems to do better when down-shifting from third gear to second and finally to first. Doesn't like going directly to first gear from third or fourth.

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14 Aug 2016 03:29 #31526 by mikespeed35
mikespeed35 replied the topic: Re: Shifting fun ............
The "goose" decreases vacuum.
Cordially Mike

Mike Huffman

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14 Aug 2016 07:03 #31527 by 1748 S
1748 S replied the topic: Re: Shifting fun ............

mikespeed35 wrote: The "goose" decreases vacuum.
Cordially Mike

Vacuum happens when the throttle plates are closed. Say you are revved up to around 2800 rpm and you want to shift. You preselect the gear you want. Let off the throttle peddle. As the engine slows down the rpms you are creating the most vacuum you can make in said engine. It won't be 29 inches of mercury but it will be all it can possibly be. Then you press in the clutch and all the magic happens with the electrical switches and the vacuum solenoids.

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14 Aug 2016 19:51 #31529 by ilikescars
ilikescars replied the topic: Re: Shifting fun ............
Makes sense! As I said, I was guessing. Thanks for setting me straight

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