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914World.com _ 914World Garage _ What goes in this hole?

Posted by: ctc911ctc Sep 10 2018, 01:46 PM

I have all of my vacuum hoses connected (new) and I have a hole open on the throttle body. Any should this hole be left open?

For reference, I have added Mr. Bowlsby's nifty diagram. Also, please note that the picture of the throttle manifold (body?) is from ebay, could not get a good shot of mine.

Thank you all 914-ers!

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Posted by: jcd914 Sep 10 2018, 01:50 PM

It is a welded in metal support tube that goes all the way through the plenum.
It does not open into the plenum, just goes through to the bottom.
There is another one on the other side of throttle plate flange.

The plenum often cracks around these tubes and creates vacuum leaks.

Jim

Posted by: ctc911ctc Sep 10 2018, 02:10 PM

QUOTE(jcd914 @ Sep 10 2018, 01:50 PM)

It is a welded in metal support tube that goes all the way through the plenum.
It does not open into the plenum, just goes through to the bottom.
There is another one on the other side of the throttle plate flange.

The plenum often cracks around these tubes and creates vacuum leaks.

Jim

Whew - this hole was driving me crazy - THANKS JIM!

Posted by: TheCabinetmaker Sep 10 2018, 04:11 PM

What he said. And, never leave a vacuum port uncapped, unless you like your idle at 2000rpm