 Oil filler differences, Which to use? |
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| scrz914 |
 Jan 13 2025, 05:41 PM
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#1
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Member  Group: Members Posts: 414 Joined: 21-April 04 From: Santa Cruz, CA Member No.: 1,960 Region Association: Central California  |
I have a couple of choices of oil fillers to use with my aftermarket oil tank. There are notable differences and I’m not sure why.
One is aluminum, the other steel. Overall length. The aluminum one is a bit longer which could make filling easier. But more intrusive. The vent hose sizing. Aluminum one is for 25mm hose the other is 13mm. I’m guessing they are designed to terminate at different devices? I’ve seen from diagrams that some end at an oil overflow bottle. Where did the hose end up on the original 914-6? Thanks for your help. Attached thumbnail(s) 
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| Cairo94507 |
Jan 13 2025, 05:49 PM
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#2
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Michael Group: Members Posts: 10,204 Joined: 1-November 08 From: Auburn, CA Member No.: 9,712 Region Association: Northern California 
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It's been a while since I owned a stock 6 but if I recall the oil breather hose from the filler neck went to the triangle of death breather tube on the engine. (IMG:style_emoticons/default/beerchug.gif)
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| scrz914 |
Jan 13 2025, 06:14 PM
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#3
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Member Group: Members Posts: 414 Joined: 21-April 04 From: Santa Cruz, CA Member No.: 1,960 Region Association: Central California |
I have a 3.0 sc motor. Trying to think where the Triangle of Death resides.
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| Nate W |
Jan 13 2025, 10:08 PM
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#4
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Member Group: Members Posts: 86 Joined: 23-February 21 From: Oceanside, Ca Member No.: 25,250 Region Association: Southern California
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You should use the one with the larger vent, the 25mm is the same as engine breather, oil tank, and where the hose attaches at the air intake, at least on my 2.7 cis.
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| scrz914 |
Jan 13 2025, 10:30 PM
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#5
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Member Group: Members Posts: 414 Joined: 21-April 04 From: Santa Cruz, CA Member No.: 1,960 Region Association: Central California |
QUOTE(Nate W @ Jan 13 2025, 08:08 PM)  You should use the one with the larger vent, the 25mm is the same as engine breather, oil tank, and where the hose attaches at the air intake, at least on my 2.7 cis. I have a 914-6 air filter box. I’ll look there to see if there are any 25mm connectors. |
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| mb911 |
Jan 14 2025, 05:34 AM
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#6
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914 Guru Group: Members Posts: 7,473 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest
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Mine is the one in the bottom of the picture. The smaller fitting is for a puke tank this the small fitting and would be the same size as the GT fillers necks. The 1” fitting on the aluminum filler is meant to connect to the stock air filter. The 1” fitting on the tank should connect to the breather near the triangle of death.
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| mb911 |
Jan 14 2025, 05:40 AM
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#7
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914 Guru Group: Members Posts: 7,473 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest
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Btw why you really don’t want the vent to connect to the air filter is that when you accidentally overfill the tank and that’s a when as everyone has done it at least once or when you drive aggressively the excess oil gets consumed by the engine and you get a ton of smoke out the tail pipe which will also effect combustion effect and could be detrimental to the health of the engine especially if running full tilt. Stock -6 engines really were not high performance so didn’t really matter
Simple answer mine is designed for puke tank just like GTs The aluminum one designed for attaching to stock filter but could be adapted to puke tank. |
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| Steve |
Jan 14 2025, 08:41 AM
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#8
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914 Guru Group: Members Posts: 5,797 Joined: 14-June 03 From: Orange County, CA Member No.: 822 Region Association: Southern California
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QUOTE(mb911 @ Jan 14 2025, 03:40 AM) Btw why you really don’t want the vent to connect to the air filter is that when you accidentally overfill the tank and that’s a when as everyone has done it at least once or when you drive aggressively the excess oil gets consumed by the engine and you get a ton of smoke out the tail pipe which will also effect combustion effect and could be detrimental to the health of the engine especially if running full tilt. Stock -6 engines really were not high performance so didn’t really matter Simple answer mine is designed for puke tank just like GTs The aluminum one designed for attaching to stock filter but could be adapted to puke tank. (IMG:style_emoticons/default/agree.gif) Been their done that. I thought my 3.2 engine died, but I accidentally over filled the oil tank during an oil change. I installed a puke bottle after that fateful day. I have a stock 914-6 filler pipe, but a smaller, less obtrusive hose would be nice to the puke bottle.  |
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| scrz914 |
Jan 14 2025, 01:56 PM
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#9
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Member Group: Members Posts: 414 Joined: 21-April 04 From: Santa Cruz, CA Member No.: 1,960 Region Association: Central California |
Thank you. This information is very helpful.
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| mb911 |
Jan 15 2025, 07:16 AM
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#10
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914 Guru Group: Members Posts: 7,473 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest
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QUOTE(scrz914 @ Jan 14 2025, 11:56 AM) Thank you. This information is very helpful. For reference the upper one in the picture is PMS brand. |
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