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Crankcase ventilation hose for 1981 Porsche 924 NA

 
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ted von Kampen  



Joined: 14 Oct 2016
Posts: 141
Location: Scottsbluff, Nebraska

PostPosted: Tue Jul 30, 2019 2:54 pm    Post subject: Crankcase ventilation hose for 1981 Porsche 924 NA Reply with quote

There is a piece of about 1"od or so hose that goes from the air intake duct to the lower back of the engine. I think it is a crankcase ventilation hose. Mine rotted and tore into. Does anybody know the PN for that hose? and where to purchase one?
thanks
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Johann  



Joined: 07 Aug 2016
Posts: 222
Location: Netherlands

PostPosted: Tue Jul 30, 2019 10:49 pm    Post subject: Reply with quote

As far as I now these are no longer available.
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MikeJinCO  



Joined: 08 Jun 2010
Posts: 926
Location: Maysville, Colorado

PostPosted: Wed Jul 31, 2019 10:15 pm    Post subject: Reply with quote

It seems like most inch size hoses can be made to work as replacements. It is when they have odd bends(like the water pump to thermostat housing)that it gets tricky. I know one FLAPS store that lets me wander around looking thru their hose stock looking for the right bend and then cutting the hose up to fit.

Pegasus Racing has aluminum hose connectors for almost any size hose and Gates actually makes HD heat shrink connectors for most water hose sizes.
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Goldwolf  



Joined: 25 Jun 2017
Posts: 223
Location: Athens,GA

PostPosted: Wed Jul 31, 2019 11:26 pm    Post subject: Reply with quote

Does the internal structure matter so much? I need one, and the internal has a smaller hole, at least for one end of it.

My hose does not have cracks yet at least.

The UK 924 owners club attempted to get some remade, I'm trying to track that down.
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924RACR  



Joined: 29 Jul 2001
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Location: Royal Oak, MI, USA

PostPosted: Thu Aug 01, 2019 10:25 pm    Post subject: Reply with quote

I feel like having that small restriction will help keep it from dumping oil to the catch can or intake... sometimes just having a couple of turns does the job.

On the racecar, we just use I think 1/2" straight hose with a 90-deg plastic elbow midway, which helps it go to the catch can, and presumably also restricts oil venting...
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scm924s  



Joined: 22 Oct 2010
Posts: 228
Location: Gloucester UK

PostPosted: Tue Aug 06, 2019 6:14 pm    Post subject: Reply with quote

Fairly certain no one in UK 924OC has attempted to get these made. needs to be oil/fuel/heat proof, normal recommendation is to get the appropriate hose size and stick a plastic/wood plug with about an 1/8"or 3/16" hole in it as a restrictor, piece of yard broom handle is a common fix for insert!
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ted von Kampen  



Joined: 14 Oct 2016
Posts: 141
Location: Scottsbluff, Nebraska

PostPosted: Tue Aug 13, 2019 4:01 am    Post subject: Crankcase ventilation hose Reply with quote

I finally found a work around. Certain brands of 3/4 inch 19MM have thinner walls than others. Find one that lets you heat a bit and slip over the crankcase vent fitting near the back of the block. I used a short piece of this hose to go over the vent tube then clamped it down. I had about 4-5 " sticking out To get the small hole that the stock hose had, I took 3 penny coins and soldered them together. I then drilled a hole thru about the same size as the stock hole in the old hose. Now I pushed the three coins down into the hose end and assured that it was in the hole flat. I then took about a 6-7" piece of 1/2" electrical conduit and bent slightly to go around the dip stick. That 1/2" fits inside the hose. Again clamp it with a hose clamp.

Now take another piece of the 19MM hose and cut to a length that will go over the end of the conduit and the other end goes over injection ductwork vent tube. Again hose clamp it.

It worked well and I found that it let the engine idle down to the proper RPM. Getting the air leaks fixed really helps get the CIS adjusted properly.
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Goldwolf  



Joined: 25 Jun 2017
Posts: 223
Location: Athens,GA

PostPosted: Sun Aug 18, 2019 12:05 am    Post subject: Reply with quote

How about a 1/2 hose. Then add a T fitting halfway that would restrict down to the small diameter. Put a catch can at the bottom of the T.

Is that catch can necassary? How much oil gets in there?

I think there may be some differences between early and later cars too in how works.
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Goldwolf  



Joined: 25 Jun 2017
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Location: Athens,GA

PostPosted: Sun Aug 18, 2019 12:51 am    Post subject: Reply with quote

Reading this thread now

http://www.924board.org/viewtopic.php?t=25323&postdays=0&postorder=asc&start=15
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Dltfam51  



Joined: 26 Jun 2019
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Location: Long Beach ca

PostPosted: Thu Sep 26, 2019 2:55 pm    Post subject: Crankcase vent hose Reply with quote

Mine vent hose was cracked . Went to Autozone got a 3/4 hose and added a 30 degree copper 1/2 copper fitting to direct the hose to the intake hose. Works great . The down side is I get oil in my intake and auxiliary valve. My car is a 1980 924
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924RACR  



Joined: 29 Jul 2001
Posts: 8334
Location: Royal Oak, MI, USA

PostPosted: Thu Sep 26, 2019 9:41 pm    Post subject: Re: Crankcase vent hose Reply with quote

Dltfam51 wrote:
Mine vent hose was cracked . Went to Autozone got a 3/4 hose and added a 30 degree copper 1/2 copper fitting to direct the hose to the intake hose. Works great . The down side is I get oil in my intake and auxiliary valve. My car is a 1980 924


Sounds like you need more baffling in that hose, a restrictor to release pressure but keep the oil in there

Quite possible you could just stuff the vertical part (over the vent on the block) with some steel wool, that may be enough.
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TJC  



Joined: 04 Apr 2010
Posts: 761
Location: Central-ish Arizona, USA

PostPosted: Fri Sep 27, 2019 12:28 am    Post subject: Reply with quote

^^^
Second the steel wool suggestion, very coarse. The oil collects on the steel wool and lets the vapors pass through.
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