Final airbox fix
10-29-2002, 05:45 PM
#1
Drifting
Thread Starter
Final airbox fix
Does anyone remember what the final factory airbox fix was?
I remember replacing the one in my 78 911SC and installing the pop-off valve just as insurance. I later learned that the replacement that I bought from the Porsche dealer was the final solution.
By the way, I once saw a 911 with a pop-off valve installed on the airbox ledge free to the open atmosphere. LOL
I remember replacing the one in my 78 911SC and installing the pop-off valve just as insurance. I later learned that the replacement that I bought from the Porsche dealer was the final solution.
By the way, I once saw a 911 with a pop-off valve installed on the airbox ledge free to the open atmosphere. LOL
10-30-2002, 07:57 AM
#2
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When I replaced my exploded airbox last year, the new one was different but I don't know whether it was the "final" fix. Rather than having the cold start fuel just spray into the airbox, the new one has a sort of "mainfold" (a network of metal tubes) which directs the fuel into the intake pipes. I was told that this was done to make airbox explosions less likely. Regardless, I put in a pop valve as well - I don't want to go through that exercise again.
10-30-2002, 11:41 AM
#3
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There was not a really final fix. As Bryan points out, there was an update around 1980-81 to better distribute the cold start fuel, and as far as I know, that's the only box available as a replacement box today. Adding a pop-off valve maximizes longevity.
10-30-2002, 01:38 PM
#4
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I think Bill is right.
However, at one time there was an all aluminum unit that was sold (NLA). THAT was a final fix (if anyone knows of one laying around drop me a line - I know of a supercharged SC that could use it).
However, at one time there was an all aluminum unit that was sold (NLA). THAT was a final fix (if anyone knows of one laying around drop me a line - I know of a supercharged SC that could use it).
10-30-2002, 02:09 PM
#5
Drifting
Thread Starter
I think the all aluminum one was from one of the aftermarket sources. When my airbox blew I ordered one but it was such a poor quality casting and a really poor fit that I sent it back.
It looks as if the "final" factory fix was the fuel distribution manifold within the airbox.
It looks as if the "final" factory fix was the fuel distribution manifold within the airbox.
10-31-2002, 03:59 AM
#6
One thing to keep in mind when doing the pop-off valve is the epoxy used. The epoxy included with the kit is good, but not as good as it should be. On mine, the epoxy dried up and on a backfire one day, blew the pop-off out. I have found that wurth epoxy, which comes in a little mixing cup, is superior like all wurth products and works much better. You can get it from any mechanic that buys from wurth.
10-31-2002, 08:55 AM
#7
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[quote]<strong>One thing to keep in mind when doing the pop-off valve is the epoxy used. </strong><hr></blockquote>
Ed, good point. I used JB Weld epoxy when I installed mine, noting it has a high temperature rating.
Ed, good point. I used JB Weld epoxy when I installed mine, noting it has a high temperature rating.
