Air Cleaner Insights, 914-6 Correct Options

[DennisV]

Is this air cleaner correct for 1970 914-6? Am I missing any components?

I went through the other air cleaner threads I could find. A couple things about our plastic one that seems curious when I compare it to the photos I'm finding of others identified as 914-6:

1. No clips or inlets for cold start fuel lines
2. Large to small outlet plastic fitting

Thanks.

P.S. I am unclear about the fittings. My best guess is the small single port metal one is a water drain valve and big plastic one with two outlets is oil breather? Not sure how to connect either.

[930cabman]

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[rgalla9146]

Not for a 6...for 911 w/mechanical fuel injection. IIRC it is for a '70-'71 with that long inlet...but they are often mis-matched.

[gereed75]

Six one has a plated metal vent connection.

[DennisV]

Not for a 6...for 911 w/mechanical fuel injection. IIRC it is for a '70-'71 with that long inlet...but they are often mis-matched.

Well that is a bummer. It does explain the lack of fuel hose clips.

Is there anything that keeps this one from being usable? I seem to recall connecting the cold start fuel lines was discouraged, so that would seem to be a non-issue.

Where can I find information on what connects to the fittings?

Thank you.

[DennisV]

Not for a 6...for 911 w/mechanical fuel injection. IIRC it is for a '70-'71 with that long inlet...but they are often mis-matched.

(IMG:style_emoticons/default/icon_bump.gif)
Bumping this to see if I can get clarity on:

• What modifications we need, if any, to use this on our stock 914-6. Cold start disabled.
• Info on what connects to fittings.

Thanks.

[Superhawk996]

Good luck on your quest

Recent thread along same lines.

http://www.914world.com/bbs2/index.php?showtopic=370249

[930cabman]

Is the air cleaner specific to a 914 6? I have a metal housing from a 911 (?) but it interferes with the rear trunk wall.

TIA

[fixer34]

Some pictures I have of mine. Cold start pipes are in place, but I removed the solenoid and fuel line connections.

[930cabman]

Thank you, is this an original setup as far as you know?

[ClayPerrine]

That air cleaner won't work with a 914-6. It uses clips that are attached to the MFI stacks. The 914-6 uses metal buckets with the clips that bolt to the carbs.

The six air cleaner doesn't have the individual holes for the stacks either.

[930cabman]

That air cleaner won't work with a 914-6. It uses clips that are attached to the MFI stacks. The 914-6 uses metal buckets with the clips that bolt to the carbs.

The six air cleaner doesn't have the individual holes for the stacks either.

can anyone post a pic or two, I will probably not need to find one, but would be nice to see the real thing. The PET only shows so much

[gereed75]

Dennis V

IMHO that is not a 914 box. It is a 911 box. The snorkel appears to be correct six but there are some 911 snorkels that go to the same side (congrats either way, these are very difficult to find).

Having said that, there is no reason that you could not use that box for 914-6. You will need the correct carburetor buckets with the long version clips as shown in the thread linked above , post #7. You will have to drill holes between the stack holes for the Weber vents.

Hate to disagree with anyone as esteemed, learned and gentlemanly as Clay, but all six boxes I have seen have the individual stack holes as shown by Fixer above.

The bottom single vent is a gas /water drain but not sure if there is a vent hose attached or where it drains to (my foggy memory way back to my first six seems to recall it did indeed have a hose attached, might be wrong there, but seems likely).

The tee fitting large diameter side accepts a hose from the oil tank vent. no idea where the opposite side smaller connection goes to (on 911 applications the small diameter vent connection goes to the charcoal filter). I have an original six box where that smaller fitting is plugged, but have no way to know if that is correct. Can't think of any where that it might hook to on a six motor but who knows??

hope that helps

[mb911]

That air cleaner won't work with a 914-6. It uses clips that are attached to the MFI stacks. The 914-6 uses metal buckets with the clips that bolt to the carbs.

The six air cleaner doesn't have the individual holes for the stacks either.

(IMG:style_emoticons/default/agree.gif) That is my experience as well. If someone has something different it is probably because it was swapped out at some point for the MFI housing

[gereed75]

Sounds like Ben has tried this. I was assuming that the plastic box , whether carb or MFI has the same shape and size to accept wire long version clips from the correct carb buckets Certainly could be wrong on that.

There are two versions of metal carb buckets - one version (on the left in the photo) have higher walls on the inside diameter of the bucket. One version does not have these higher wall extensions. Only the buckets without the extensions will work with plastic boxes. I think the higher wall version is for metal boxes.

The incompatibility of these different buckets may be the reason that some have had problems making plastic boxes work. See the picture below and the link shown in post #7 above where Rory shows a different picture of the same bucket issue. I see no reason why you could not trim the higher inner wall to make it even with the outer wall to make a bucket intended for a steel box work on a plastic one as suggested by Rory in the same linked thread.

[mb911]

So the bucket have the brackets located at different heights as well depending on MFI or carbs along with longer clips

[gereed75]

It’s always something. I guess the safe way is to get the correct buckets, no raised inner wall.

Guess that’s why there are a variety of clamp sizes. Now looking more closely at Rory's pictures, it does appear that there is a slight difference in the height of the clip mounts between the the higher inner wall bucket and the correct one with even height walls. Either way the higher inner wall one will not fully seat down into a plastic box, therefore the clip distance is different and the rubber seals never seat onto the box body.

Until looking with this much detail, never knew the differences, Guess I was just lucky when I bought the buckets at hershey and got the right ones.

[DennisV]

Dennis V
all six boxes I have seen have the individual stack holes as shown by Fixer above.

My goodness. Who would have thought so many permutations of the air cleaner box.

So there is not even consensus as to whether the bottom should have 2 large oval holes or 6 smaller round ones?

Can anyone share the length on the clips? @rgalla9146 Had a side-by-side photo in another thread, but hard to know which you have without knowing the dimensions.

If it was mentioned elsewhere, I missed it. The PDF parts catalogs show the following part number shared with 911:
Main body: 911-108-001-02 [914-6 and also 911 -68]
Also the gaskets, pipe, water drain valve, backfire grid shared. Not the carburetor connecting piece though.

[930cabman]

It’s always something. I guess the safe way is to get the correct buckets, no raised inner wall.

Guess that’s why there are a variety of clamp sizes.

Especially with /6 conversion, the number of details appears never ending. I am not even going to try and calculate the hours I have into this /6 conversion, all I can say is many many

From what I can tell there is no air filter that will fit between #3 carb and the trunk wall, very small clearance

[gereed75]

Sure. the plastic one will fit and apparently the metal one will also. Ben made it work with some relatively slight mods. Ill let him chime in if he wants to detail those mods. Never did it myself.

There are two style wire clips, the longer and the shorter. Not sure what configuration uses the shorter ones. Plastic tops use the longer. It is pretty apparent when you have them in your hand. The longer ones are 3" when fully extended. sorry, dont know the PN.

you guys have persevered a lot to get to this point. This is really not a biggy. Really tough finding all the parts if you are trying to do a completely correct resto on a factory six, not so tough for a conversion.

I think if I had my druthers and wanted a factory box I would do a metal one. No fire/distortion/melt issues. Guess that would require the higher inner wall bucket. Just not sure which clips those use. (-:

There is a very comprehensive thread regarding this over on the Early 911S registry. If i have time latter to find it I will post a link. In that thread even the most esteemed Grady Clay (RIP) got it wrong at first. The factory changed things as it went along. They never considered the confusion that the changes might make decades into the future for us sick old Porsche hobbyists!