Timing Belt Need replacment?

[napatiger]

I bought the plastic lines for that not to long ago....

So I know they are not discontinued for the 95.

[WhiteMonteZZZ]

I bought the plastic lines for that not to long ago....

So I know they are not discontinued for the 95.

napatiger,

Do you know by chance a somewhat "official" part name, or better yet have a receipt with part numbers? I know if I go to the dealer and say "plastic PCV lines" that the moron there (always the same guy at the dealer) won't know what the hell they are. W/O a part name/number, it's a struggle with them

I know someone out of state and will have him try to look the part nums up for me though, but just wondering if you have any info on them first.

Thanks,

WMZZZ

[napatiger]

I paid cash,

Just to make sure we are talking about the same thing...

Hard black plastic tubing routes to valve cover, air intake, ect..
It is sold as an assembly of like two or three pieces.

I watched the guy look it up on the computer.

Some dealerships still have this part in stock if it has been discontinued...

Watch the computer.

Price, I forgot, it is depressing how much I spent on my rebuild

[WhiteMonteZZZ]

I paid cash,

Just to make sure we are talking about the same thing...

Hard black plastic tubing routes to valve cover, air intake, ect..
It is sold as an assembly of like two or three pieces.

I watched the guy look it up on the computer.

Some dealerships still have this part in stock if it has been discontinued...

Watch the computer.

Price, I forgot, it is depressing how much I spent on my rebuild

Good stuff. Yeah I'll head over there in a few days and see what they/I can dig up. Glad it's sold as an assembly though - that will help.

Thanks again!

By the way, I see you too have a 95 Z34. Do you ever read/post on MyMonte.com?

[napatiger]

I read there and I would like to post but hell, I have never been able to log in....

Maybe I am an idiot\, I think I got my username and emails mixed up or something. I am actually registered under two emails.

I have never posted on w-body either, but would like to.

Those 3 web sites were critical to my rebuild

This is the first time I ever did anything besides change the oil..

So far, I pulled the engine (three times)

Tore down the whole thing top to bottom.
Sent in heads and block to machine shop
replaced pretty much everything that breaks or corrodes.
replaced CAT
New lifters
UD, Mounts, Timing, pullies, tensioners, ect
I changed the rear brakes to 96 GP, with ss lines and drilled slotted rotors and working E-brake.
I just did my front suspension last weekend and this weekend will do the rears (KYB and Eibach) Ball joints, Control arm bushings

Engine and Tranny are together on the subframe now, waiting to go back in.

Hell, I can probably do that in 6 hours and a 6 pack.

[Juglenaut]

Never been reg'ed on w-body, been there to read a few things but never joined.

[WhiteMonteZZZ]

I read there and I would like to post but hell, I have never been able to log in....

Maybe I am an idiot\, I think I got my username and emails mixed up or something. I am actually registered under two emails.

I have never posted on w-body either, but would like to.

Those 3 web sites were critical to my rebuild

This is the first time I ever did anything besides change the oil..

So far, I pulled the engine (three times)

Tore down the whole thing top to bottom.
Sent in heads and block to machine shop
replaced pretty much everything that breaks or corrodes.
replaced CAT
New lifters
UD, Mounts, Timing, pullies, tensioners, ect
I changed the rear brakes to 96 GP, with ss lines and drilled slotted rotors and working E-brake.
I just did my front suspension last weekend and this weekend will do the rears (KYB and Eibach) Ball joints, Control arm bushings

Engine and Tranny are together on the subframe now, waiting to go back in.

Hell, I can probably do that in 6 hours and a 6 pack.

Napatiger,
You want me to talk to our Admin Manitcor over at MM and get you hooked up? We've switched formats a few times now and most stuff transferred flawlessly -- however your acct MIGHT have got messed up...I can talk to Manitcor for you though and get you registered/re-registered if you want? PM/post and lemme know!

-WhiteMonteZZZ

[series8217]

Guys, the PCV system is really very simple.
You pull vacuum from the crankcase by connecting the crankcase to a source of vacuum, in this case the intake manifold/throttle body. Because you're sucking air out of the crankcase, it has to be replaced by air. So you have openings on the valve covers that allow air to flow back in. You want air filters on these vents so you suck clean air into your motor.
The idea is to evacuate combustion gasses from the crankcase and suck them into the motor so they dont contaminate your oil, as well as pull a slight vacuum to help the rings seal, but moreso just provide ventilation, hence Positive Crankcase Ventilation (PCV).
It DOES NOT MATTER what the breathers hook up to. The only reason the factory hooked it up to the intake tubing is so they didnt have to have individuals filters for each breather. Rather, you know that the air in your intake tubing past the filter is clean so it is used. ALSO if you have blowby, the EPA doesnt want you putting those blowby gases into the atmosphere, so they end up going into your intake where they are burnt by combustion.

[WhiteMonteZZZ]

Guys, the PCV system is really very simple.
You pull vacuum from the crankcase by connecting the crankcase to a source of vacuum, in this case the intake manifold/throttle body. Because you're sucking air out of the crankcase, it has to be replaced by air. So you have openings on the valve covers that allow air to flow back in. You want air filters on these vents so you suck clean air into your motor.
The idea is to evacuate combustion gasses from the crankcase and suck them into the motor so they dont contaminate your oil, as well as pull a slight vacuum to help the rings seal, but moreso just provide ventilation, hence Positive Crankcase Ventilation (PCV).
It DOES NOT MATTER what the breathers hook up to. The only reason the factory hooked it up to the intake tubing is so they didnt have to have individuals filters for each breather. Rather, you know that the air in your intake tubing past the filter is clean so it is used. ALSO if you have blowby, the EPA doesnt want you putting those blowby gases into the atmosphere, so they end up going into your intake where they are burnt by combustion.

:wtf1: Now I'm

So recapping the posts....Ben says a vacuum pulling these gases/vapors out is more beneficial/better for the motor, yet series8217 says that running breathers doesn't make a difference as the gases/vapors pulled from the valvecovers (etc) gets reburned for cleaner emmissions? Hmm...

[series8217]

:wtf1: Now I'm

So recapping the posts....Ben says a vacuum pulling these gases/vapors out is more beneficial/better for the motor, yet series8217 says that running breathers doesn't make a difference as the gases/vapors pulled from the valvecovers (etc) gets reburned for cleaner emmissions? Hmm...

Uhh?
Gases/vapors dont get pulled from the valve covers. Just the crank case.
The valve cover openings let in fresh air from outside the motor that will replace the gases/vapors sucked out of the crankcase.

[SappySE107]

If that is the case, where is the engine getting its air from on the stock setup? The crankcase and valve covers are all under vacuum so the air would have to come from somewhere. There should still be some pressure differences under the valve covers due to the lifters going up and down and cam lobes spinning around. Its no crank but its doing something.

[series8217]

If that is the case, where is the engine getting its air from on the stock setup?

From the intake tubing between the air filter and throttle body blade. You know there's only vacuum PAST the throttle body blade when closed, right? The valve covers are NOT under vacuum. Vacuum is pulled through the crankcase vent.


[digression]
The early motors may have had vacuum pulled off one valve cover with the crankcase vent and other valve cover providing openings for fresh air. This was changed because the airflow would interfere with oil drainback. You should change to the design that pulls vacuum from just the crankcase, with each valve cover as a breather, if you have the other arrangement. The only disadvantage is if all of your drainback passages are full of oil you will have an actual vacuum in the crankcase which could possibly cause the oil pump to cavitate. I have NEVER heard of this happening. I don't think there is enough vacuum even at high RPM closed throttle. Thats why you dont use a dedicated vacuum pump to pull crankcase vacuum with a wet sump system. Those dedicated vacuum pumps pull so much vacuum that they prevent oil from getting to the oil pump.
[/digression]

[WhiteMonteZZZ]

:wtf1: Now I'm

So recapping the posts....Ben says a vacuum pulling these gases/vapors out is more beneficial/better for the motor, yet series8217 says that running breathers doesn't make a difference as the gases/vapors pulled from the valvecovers (etc) gets reburned for cleaner emmissions? Hmm...

Uhh?
Gases/vapors dont get pulled from the valve covers. Just the crank case.
The valve cover openings let in fresh air from outside the motor that will replace the gases/vapors sucked out of the crankcase.

That's what i thought initially. Thus my reasoning for putting small mini-breather filters on those ports versus re-running the vacuum lines that got screwed up. I know the main pcv line is obviously the most important (the one that runs from the plenum to under the lower intake, and holds the pcv valve). The other two plastic valvecover lines simply ran to a "T" junction on that main line (at least on my setup). I capped the end of the 't' where teh front valvecover line ran to, and the other part of the 't' runs small amount of vacuum hose to the 2nd mini-breather. Though Ben said he noticed a power difference on his car w/breathers hooked up, I've yet to see any adverse power issues.

[SappySE107]

I am not talking about gasses in the valve covers. There is still pressure build up though. I have also noticed when I ran a breather on my 3.1 that there was a lot of oil residue all around the filter and the valve cover. This tells me its not sucking anything in, but rather, blowing it out. This follows the exact same setup for stock having vacuum on the valve covers and the crank case.

Whatever works I guess. Nico had this engine all messed up for coolant flow and vacuum lines when I got it which may be why I noticed a performance change when I fixed the vacuum setup.

[WhiteMonteZZZ]

I am not talking about gasses in the valve covers. There is still pressure build up though. I have also noticed when I ran a breather on my 3.1 that there was a lot of oil residue all around the filter and the valve cover. This tells me its not sucking anything in, but rather, blowing it out. This follows the exact same setup for stock having vacuum on the valve covers and the crank case.

Whatever works I guess. Nico had this engine all messed up for coolant flow and vacuum lines when I got it which may be why I noticed a performance change when I fixed the vacuum setup.

I guess I'm somewhat agreeing with you now Ben. Yes I personally thought they were outward vents as well (hell, the line from the rear valvecover that went into the intake elbow used to put a little bit of oil in my intake arm from time to time (no oil coming out of my breather though - somehow reducing the negligible blowby???). But my front breather doesn't ever get oil-soaked or anything. I still say my butt dyno never noticed any perf. decreases, nor has my motor imploded or whatnot. Also I was using the old-school way of thinking while doing this - since the 3800 guys get a screw-in valvecover breather where the oil cap goes, I wanted to do this but my DOHC doesn't have the new-style 1/4 or 1/2turn cap like they do, so I put the breather on the end of the valvecover. Essentially the same principle, at least how I interpreted it. The back line is only on a breather for the fact that I ripped the grommet originally in my shortarm intake and when trying to fix it, broke part of that plastic line running into the intake arm. Thus, adding a 2nd breather. I know better than to f*ck with the PCV system itself though. I DO understand that pressure on the DOHC CAN build up in the valvecover area/etc, but I didn't know/still don't know that a vacuum pulling where my breathers is is essential. I might still get the lines though and re-run the rear valvecover line back into the intake elbow as I just am unhappy w/the mounting/placement of my rear breather. But I think I'm going to keep the front breather. Unless all of us reach a solid concensus about it hurting (or not) performance/longevity.

Hell, I might just try to talk to/make friends w/a DOHC-knowledgable tech at my local Chevy dealer and whilst he changes my timing belt/tensioner/etc, ask him about the breather(s).

EDIT: Also...I just remembered buried in my garage are 95 MC shop manuals (GM). I'll look at the vac diags in there and see what all they say about the full-functionality of those lines in question!