Author Topic: Runaway truck! Breather mod questions...  (Read 15747 times)

Reply #15May 26, 2005, 04:22:59 pm

Deadeye

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« Reply #15 on: May 26, 2005, 04:22:59 pm »
That's the way to do it. Veeman.
It'll run a while like that.
80 Dasher Diesel Wagon

Reply #16May 26, 2005, 04:42:07 pm

toomanycars

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That's (almost) exactly how I did it.
« Reply #16 on: May 26, 2005, 04:42:07 pm »
I didn't need the hose clamps. Perhaps my metric irrigation pipe Ts were just the right size(?) Still no runaway, so it must be OK for now.
Regards, Peter.
1978 Golf diesel
1984 Nissan Patrol diesel
1986 Toyota Landcruiser 73 series 3B diesel
2006 Golf TDI 2.0 16v

Reply #17May 27, 2005, 08:12:43 am

veeman

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« Reply #17 on: May 27, 2005, 08:12:43 am »
To tell you the truth, I'm not sure I need those clamps either.  The copper tee's with the bead on the ends is pretty close to the ID of the 5/8" heater hose I needed.  

As it's not a high pressure application, I'd imagine I could have just left them off; however, it's cheap insurance in that high-vibration environment.
81 Caddy TD
98 Audi A4 Quattro V6 TDI
83 VW GTI FSP
86 4ktq

Reply #18May 28, 2005, 06:22:50 pm

moshaholic2

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« Reply #18 on: May 28, 2005, 06:22:50 pm »
what exactly is "blow by",   I was reading this thread, and noticed the mention of excessive white smoke (a problem I have on a mystery mile rabbit).  

I understand that runaway is caused by oil driping back into the intake and being burned as extra fuel...

So, I wondered if this was the cause of my smoke.... I popped off the hose on top of the intake, and lots of exhaust smoke came out of the hose (comming from the cam cover).  Now how the hell could it be that smokey under them cam cover?  

Veeman, did your set up stop the excessive smoking also?

Reply #19May 28, 2005, 08:03:47 pm

Deadeye

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« Reply #19 on: May 28, 2005, 08:03:47 pm »
Blowby is compression that gets past your rings and pistons.
THis blowby is hot and can vaporize the oil in your crankcase and or  cylinder walls, and this vaporized oil deposits in the intake.
80 Dasher Diesel Wagon

Reply #20May 29, 2005, 07:20:58 am

jtanguay

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« Reply #20 on: May 29, 2005, 07:20:58 am »
so that means that an engine with blowby has a lower lifespan because less oil lubricating the cylinder walls??


This is how we deal with porn spammers! You've been warned.

Reply #21May 29, 2005, 04:54:38 pm

Deadeye

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« Reply #21 on: May 29, 2005, 04:54:38 pm »
It has the same oil on the cylinder walls, it's just getting cooked with exhaust gasses.

The blowby gets worse and worse.
80 Dasher Diesel Wagon

Reply #22June 02, 2005, 03:57:09 pm

toomanycars

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Smoke
« Reply #22 on: June 02, 2005, 03:57:09 pm »
Quote from: "moshaholic2"

So, I wondered if this was the cause of my smoke.... I popped off the hose on top of the intake, and lots of exhaust smoke came out of the hose (comming from the cam cover).  Now how the hell could it be that smokey under them cam cover?  

Veeman, did your set up stop the excessive smoking also?

Question was for Veeman...But my diesel still smokes under full throttle going uphill even with the modification. Blowby smoke stills goes into the air intake and then down the exhaust. I'll put up with it until it gets embarassing!
Regards, Peter.
1978 Golf diesel
1984 Nissan Patrol diesel
1986 Toyota Landcruiser 73 series 3B diesel
2006 Golf TDI 2.0 16v

Reply #23June 02, 2005, 04:18:41 pm

veeman

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« Reply #23 on: June 02, 2005, 04:18:41 pm »
>>Veeman, did your set up stop the excessive smoking also?

Well, the only smoking I saw with my 1.5 was the smoke that poured out like a crop fogger when the runaway occurred.  

After I did the mod, I only see a touch of bluish-white smoke on cold start up and a puff of black smoke on warm start up.  I think that's probably normal for my engine with its miles.
81 Caddy TD
98 Audi A4 Quattro V6 TDI
83 VW GTI FSP
86 4ktq

Reply #24June 15, 2005, 12:51:20 pm

fspGTD

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Runaway truck! Breather mod questions...
« Reply #24 on: June 15, 2005, 12:51:20 pm »
Hey guys -

Here is how the MANN Provent install worked itself out on dad's VNT 1.6l Rabbit:


Not sure if there is room in that location in other applications such as non-turbo diesels or 1.6lTDs, but the location just seemed perfect for this engine bay with the low-mounted VNT turbo and all the room in that area.  The top of the provent and its filter can be removed in place too!  :)  To mount it, I bolted a strip of aluminum stock to custom-fabricated square nuts I made and put behind some rectangular brackets that were hanging out on the firewall, accomplished without any permanent drilling of the body's sheetmetal.  The provent then bolts to the aluminum strip.  For the hose, I cut the stock naturally aspirated crank vent breather hose, and found that it fit perfectly and even gave a dropped section which helps it to flex with engine movements.  To adapt the crankcase vent hose to the provent inlet nipple, I shoved an appropriate copper plumbing adapter fitting into the provent's inlet nipple and clamped the 3/4" ID crankcase breather hose section to it.

I've only driven it once with the provent so far, and this engine actually seems to put out very little oil vapors in it's blowby, but so far so good.  It is nice to have a solution that is guaranteed not to recycle crankcase oils back into the boost tubes and pretty clean as well.
Jake Russell
'81 VW Rabbit GTD Autocrosser 1.6lTD, SCCA FSP Class
Dieselicious Turbocharger Upgrade/Rebuild Kits

Reply #25July 22, 2005, 12:50:02 am

river_clan

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Here's our trick, but it's smelly...
« Reply #25 on: July 22, 2005, 12:50:02 am »
I have a 1.6td in an 86 suzuki samurai. It has a 1 notch head gasket, and hits 10lbs of boost.

I was plagued with oil leaks. Couldn't get them to stop after replacing gaskets many times.

We vented the crankcase, but tee'd it into the valve cover oil seperator line, and ran it before the turbo.

It sucked 1-1/2 quarts of oil out of it on 100 mile drive!

So after lots of head scratching, and realizing I don't want any of this blowby to go into the intake... I found this handy air/oil seperator from Summit. They use it for dry sump oil systems for race cars. It was cheap too. $29!


http://store.summitracing.com/default.asp?Ntt=air+oil+seperator&x=0&y=0&Ntk=KeywordSearch&DDS=1&searchinresults=false&N=0&target=egnsearch.asp
Subverting the dominant paradigm. One tank at a time.

1986 1.6TD powered Samurai
2003 TDI New Beetle
- Both running 100% biodiesel!

Reply #26July 22, 2005, 04:07:35 pm

toomanycars

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Tap on the bottom?
« Reply #26 on: July 22, 2005, 04:07:35 pm »
I assume the little red thing at the bottom is a drain tap for the oil? Could you put a one-way valve on this and plumb it back to the sump? Where do you buy these things?
Regards, Peter.
1978 Golf diesel
1984 Nissan Patrol diesel
1986 Toyota Landcruiser 73 series 3B diesel
2006 Golf TDI 2.0 16v

Reply #27July 23, 2005, 05:42:13 pm

Bruce

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runaway truck
« Reply #27 on: July 23, 2005, 05:42:13 pm »
Do the crank case vapors come out the filter on top of that tank and how much oil do you have to drain out of that tank.I would think the valve cover vent and the crank case vent that veeman is talking about would be at the same pressure so there is no actual air flow between the two vents.

Reply #28July 27, 2005, 07:20:18 pm

toomanycars

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Re: Tap on the bottom?
« Reply #28 on: July 27, 2005, 07:20:18 pm »
Quote from: "toomanycars"
I assume the little red thing at the bottom is a drain tap for the oil? Could you put a one-way valve on this and plumb it back to the sump? Where do you buy these things?


Repeat, "Where do you buy these things?" (C'mon...Don't be coy!)
Regards, Peter.
1978 Golf diesel
1984 Nissan Patrol diesel
1986 Toyota Landcruiser 73 series 3B diesel
2006 Golf TDI 2.0 16v

Reply #29July 27, 2005, 08:55:48 pm

Deadeye

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« Reply #29 on: July 27, 2005, 08:55:48 pm »
80 Dasher Diesel Wagon

 

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