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Team California
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Location of vacuum distributer hose on '74 914 2.0?
I've recently acquired a '74 2.0 with original FI. The vacuum hose for the distributor retard is present and connected but not the advance hose. For the life of me, (and after looking at many out-of-focus pictures online, I cannot find another vacuum connection on the throttle body that would produce *above butterfly* vacuum.
What am I missing here? Is it on the air cleaner?  Here are a couple photos of mine with air cleaner removed, retard line is clearly visible:  
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Denis Statement from Tylenol: "Nice try. Release the Epstein files." 
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12-26-2013, 09:01 AM
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Registered
Join Date: Oct 1999
Location: San Ramon, CA
Posts: 1,207
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Thats the factory late-1974 set-up. For a 1-port throttle body, the advance is not connected.
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12-26-2013, 09:16 AM
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Team California
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OK, thanks.
I feel sort of deprived, though. And it just doesn't seem "Porsche-like" to have a working vacuum advance installed with a nipple and nothing connected to it. Is it the same distributor as a '73 or early '74 2.0? Could I realize a small performance gain by making advance operable somehow? Thanks a lot for the knowledge.
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Denis Statement from Tylenol: "Nice try. Release the Epstein files."
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12-26-2013, 09:30 AM
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Registered
Join Date: Oct 1999
Location: San Ramon, CA
Posts: 1,207
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The '73 and early '74 2.0 have the 2-port throttle body...the advance is hooked up with that style.
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12-26-2013, 09:37 AM
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Team California
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Quote:
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Denis Statement from Tylenol: "Nice try. Release the Epstein files."
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12-26-2013, 10:25 AM
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Registered
Join Date: Oct 1999
Location: San Ramon, CA
Posts: 1,207
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The dizzy's are different PN's, not sure what their advance curves look like.
http://members.rennlist.com/pbanders/djetparts.htm#parts |
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12-26-2013, 01:40 PM
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Team California
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Quote:
Thanks, what a fantastic page. I'm impressed that someone made the effort to aggregate all of that and had the skill to make it a legible document!  It seems to me that if the early and late '74 914 2.0 both have a timing spec of 27 deg. BTDC with vacuum disconnected, then the earlier cars with vac advance simply have slightly more total advance, ie. 27 deg. BTDC + whatever the vac advance adds. Not sure what the emissions advantage was at the time in reducing the total advance?
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Denis Statement from Tylenol: "Nice try. Release the Epstein files."
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12-27-2013, 05:46 PM
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Administrator
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Note that the vacuum advance only shows up with the throttle is open a very small amount, when the throttle plate is just off idle.
Some information about when the advance comes in and how much can be found here: https://web.archive.org/web/20001007043902/http://www.dgi.net/914/tech/distrib.html --DD
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Pelican Parts 914 Tech Support A few pics of my car: http://www.pelicanparts.com/gallery/Dave_Darling |
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12-28-2013, 09:43 AM
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74 Porsche 914 2.0 
