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sctbrd
Samba Member
Joined: May 06, 2013
Posts: 181
Location: Moravia, Czech Republic
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 Posted: Fri Apr 12, 2024 2:44 am Post subject: Timing with vacuum disconnected |
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I never do this, but, I just saw a couple posts that say to disconnect the vacuum hose AND PLUG (I only disconnect the hose).
The references (Bentley, Haynes) I have only say "disconnect".
How much of a difference will this make in performance, efficiency. Or is it a thing.
March 1965 Type 3 1500S motor Bosch ZV/JCU 4R3 distributor
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KTPhil 
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Location: Conejo Valley, CA
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| Posted: Fri Apr 12, 2024 9:24 am Post subject: Re: Timing with vacuum disconnected |
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If the carb port has vacuum at idle, you want to plug it so it doesn't leak and throw off the idle mixture and maybe the speed, which can affect the mechanical advance part of the distributor. Best to plug anything you pull off.
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heimlich
VWNOS.com
Joined: November 20, 2016
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Location: Houston, Texas
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| Posted: Fri Apr 12, 2024 3:34 pm Post subject: Re: Timing with vacuum disconnected |
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You want to plug the port on the carburetor. You can leave the tube attached to the vacuum canister.
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sctbrd
Samba Member
Joined: May 06, 2013
Posts: 181
Location: Moravia, Czech Republic
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| Posted: Sat Apr 13, 2024 10:00 pm Post subject: Re: Timing with vacuum disconnected |
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| KTPhil wrote: |
| If the carb port has vacuum at idle, you want to plug it so it doesn't leak and throw off the idle mixture and maybe the speed, which can affect the mechanical advance part of the distributor. Best to plug anything you pull off. |
That makes sense. Thanks
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Erik G
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| Posted: Yesterday 10:14 am Post subject: Re: Timing with vacuum disconnected |
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this specific distributor has dual weights right? I believe this specific distributor on a high compression 1500S you time it at 12.5 degrees 3rd line to the right, and very important, at 700 rpm. Disconnect 2 plug wires to get the RPM down.
I've had a few 1500S's so this sticks out to me
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Bobnotch
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Joined: July 06, 2003
Posts: 22396
Location: Kimball, Mi
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| Posted: Today 12:03 pm Post subject: Re: Timing with vacuum disconnected |
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| Erik G wrote: |
this specific distributor has dual weights right? I believe this specific distributor on a high compression 1500S you time it at 12.5 degrees 3rd line to the right, and very important, at 700 rpm. Disconnect 2 plug wires to get the RPM down.
I've had a few 1500S's so this sticks out to me |
I was wondering if this was that combo where it's called out in the big Blue Bentley to remove 2 plug wires to time the engine, because the mechanical advance starts so early.
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