diesel question

phatazzgti

Demonic Horde
Applebag

Posts: 160

diesel question

« on: March 05, 2008, 09:20:08 AM »

here is a link from vortex, http://forums.vwvortex.com/zerothread?id=3717905

here is what i wrote on vortex..........

the hose that runs from the top of the valve cover to the top of the intake manifold. is it really neccessary to dump all that crap right into the air filter? i know it serves a purpose, but can't i just plug the top of the manifold and run some heater hose to a catch can mounted to the firewall or something? i did this on my mk3 vr.
when i take out my air filter, the only place it gets dirty is right in the middle where the crap from the motor gets dumped into the manifold. coincidentally the middle of the filter is also the only place where good air flow is prominent, so i don't want it getting blocked up so easily.

one more question, right in the center of the intake manifold is a little extension that goes down and sits right in front of the hole where the breather tube lets out on top of the intake manifold. what if i removed that extension? cut it off? it would allow more airflow correct?

i know vw made a decent motor with these diesels, and the best thing to do is keep them the way the engineers intended to, stock. but it's the kid in me that always wants to tinker. i can't help but think that relocating the dump off for the breather hose and cutting down that extension would give me a slight increase in power which in turn would equal more torque.

thanks in advance, i'm thinking this topic could get a few replies. and i tried to search it and came up with nothing.


	Logged

spite

Applebag

Posts: 222

Re: diesel question

« Reply #1 on: March 05, 2008, 12:52:20 PM »

The hose that runs into the air filter helps to re-burn blow-by and sucks sulphurous unburnt fumes from inside the crank-case. You could just vent it, but it's not going to improve performance in any way you'll notice. Removing the extension will allow more airflow, but it will be unmetered airflow that bypasses your venturi. Opening that will make you run lean, and you will notice a performance difference, as in: it will run hotter because you're leaning it out, particularly at high RPM.

Pop your valve cover and install a cam saver, clean/replace the baffles on the valve cover and you'll probably have a lot less oil spray on your air filter. As for performance mods, the mk1 diesel motors are about as 'tuned' as you're going to get without looking at a turbo or huge-ass intake venturi (vwmotorsports) or both. It's a small-displacement diesel with a good fuel supply and rationing system. Only way you're going to get more hp out of it without sacrificing longevity is by force-feeding it more air.

That's pretty much the case with anything that's got a fuel distributor.


	Logged

If at first you don't succeed, it's CIS-E.

phatazzgti

Demonic Horde
Applebag

Posts: 160

Re: diesel question

« Reply #2 on: March 05, 2008, 02:29:01 PM »

thanks for the reply.

i know that venting that breather wouldn't get me any more performance, i'm just wondering if it would hinder the performance. guy on the tex said that it creates a vacuum which is neccessary for the seals in the motor and prevents longevity. if i vent it what happens to those fumes? will venting it be sufficient enough to get them outta there or does that vacuum help with it? basically, should i just fucking leave it?

and as far as cutting that part of the manifold, i decided i'm just going to leave it i don't wanna fuck with this motor at all. its got 60,000 original miles on it and runs good, why take a chance at fucking something up right?

where can i get a camsaver?


	Logged

spite

Applebag

Posts: 222

Re: diesel question

« Reply #3 on: March 06, 2008, 04:17:17 AM »

Since I have the valve cover off my car I'll get you the OEM part number off of my cam saver this weekend. I would check parts4vws.com (might not be a good address. Google parts 4 vws) because that's the sort of thing I'd expect they have. I order a lot of stuff from them because I like candy.

The vacuum isn't totally necessary, but it will help to get the acidic carbon compounds out of the crankcase and help extend the life of your oil, etc.
I hadn't heard of it inhibiting longevity. I don't think the motor would fare any better with that disconnected, honestly. The diesel's subjected to much higher pressures and every bit you can do to evacuate unburnt fuel fumes is a Good Thing™ as it will help keep the viscosity of the oil high and the ph of the oil low.
As for the mileage... you can put a million miles on a diesel engine if you take the time to warm it up consistantly. Running it before it's warm is more harmful than if you did it to a gas engine. I'm not sure why, but I've seen the consequences.
Venting it just lets the fumes run out into the atmosphere, which is bad for the environment, but not particularly harmful to the motor. On the other hand, having the vacuum at the top of the motor also helps with lubrication to a small degree.
There was probably a less redundant way for me to write all of that.


	Logged

If at first you don't succeed, it's CIS-E.

Pages: [1]

« previous next »