OK, I'm getting a little blow-by in my brand new built 383 from coast high performance at coasthigh.com. I asked them about this and this is what they told me:

Most likely what has happened is you have not sufficiently relieved the
pressure in the oil pan. This will result in pushing oil around
everything. As well as creating blow by. Remotely, if you used regular
oil instead of non detergent you washed all the moly off the rings and
they didn't seat correctly.

I'm not familiar with this at all, not saying it isn't right, but can someone give me some insight to this? Thanks

Josh

 

Josh,

What's the PCV system like?

How did you break the motor in?

You should post this in LT1 tech is possible, or someone will move this thread ;-)

Bret

 

Coast High is good for the run around stuff.(Know most of those guys out there)

First I would get a one way check valve and put it inline between the vacuum supply and the PCV valve. Any of the blower shops will have one. If it's the blower this will stop it. Make sure it is installed correctly.

Moly rings are not good for a blower app anyway. Did Coast know it was for a blower car? The last one I did with molly rings(C&A customer supplied) in two weeks the molly was in the pan(10 PSI). It was as if someone had put in a hand full of fine black sand. I found a spoon full in the front sump of his Mustang.

If your tune was off it could have caused to much fuel in the engine causing the cyl's to wash or there could have been too much timing under boost or to lean under boost. Are you running an FMU? What type of intank pump?

I would do the check valve and drive it,after ya change the oil to a non synthetic 10W-30. Then do a leakdown test and that will tell ya.

 

To answer your questions and to ask some; I ordered a billet alluminum check valve from blowerworks.com, so that should be here. My pcv system I'm not sure is up to par. I don't really know how to hook it up properly. I've been on pcv threads, got some ideas, but I need a proven effective way, and pics would help too if someone wanted to post some of there system with a blower. I had the pcv hose and the hose from the pass. side rear valve cover t'd into the inlet after the maf/before supercharger as the vacuum supply. Someone told me they shouldn't be in the same place. And I also had a breather on the front pass valve cover.

Coast high did know it was for a blower application b/c I had them build the engine with blower dish pistons. If the moly comes off, is that really bad?

No fmu, I'm using 2 fuel pumps, one inline and one in the tank. Before my tune, I did dump alot of fuel in the engine. I had to replace the spark plugs b/c I fouled them out. If the cylinders were washed, how bad is that also?

If ANYONE could tell me the best way to run a pcv system with a boosted application, I'm all ears. I have 2 hoses, one from the pass. side rear valve cover, and one from the pcv valve on the intake. Where do they go?

 

How should you break a new motor in Bret? With some dyno tunes?
I've seen some people say you need to put like 500 miles on them or something like that? I've seen people build them and put them on a dyno with no, or very few miles on them. What's thebest approach?

And this is general tech stuff I would assume? pcv system, blow-by, stuff like that.

 

If a lot of fuel got in then it washes the oil out and the cyl's slick out and rings don't seat
If the moly is gone ya basically got NO rings.
Read my earlier post,put the check between the PCV valve and where it hooks back to the intake(vacuum source).
The line from the pass side valve cover probably won't be a problem but if it is put one of those plastic see through fuel filters in the line and let it lay on the intake by the injectors. and plug the hole at the TB.

http://shbox.com/page/index.html Go here for info.

Get rid of the breather on the valve cover on drivers side. Run one hose from the pass side VC to the Filter and the PCV valve to it's vacuum source that is right beside the PCV valve on a stock intake and that hose is where the check valve belongs installed the correct way,to prevent boost from going into the PCV valve.

 

Where do I get the plastic filter at? Pep boys or autozone? Man that would suck if I had to rebuild the engine.

 

Any good parts house should have one in the hose size ya need.

 

And, plug which hole at the throttle body? They are all plugged already. Does royal purple have detergent in it? That's what is in the engine. I plan on draining it and putting 10w30 in, I was just curious if that could have been the reason this is happening in the first place.

 

I keep suggesting that he needs to go through the PCV question with other people who have a blower and have sorted it out.

Seems to me that any "vacuum" connection past the blower will have boost on it a good part of the time, meaning that there will be frequent occasions when the PCV system will not be working. The blower setups I've seen run the PCV vacuum side to the ducting in front of the blower, so there is always a small flow from the crankcase to the PCV valve and out to the blower suction. Then they put an oil separator in the line to keep oil out of the blower/intake. The source for crossflow air is a simple breather in place of the passenger side air line from the TB. If you leave the line from the TB to the valve cover, you're pressurizing the crankcase whenever its under boost.

Maybe there are limits to how much boost you can run with that PCV setup????? What does a "nitrous" guy know about "boost"? That's why I keep refering him to the Forced Induction forum for that part of the question.

For big blowers, I know this works:

http://www.injuneer.com/images/photo.../DCP03825a.jpg

 

Royal purple is a synthetic. Ya want dino oil in it. Havoline,Exon, Kendal,ect and put in a straight 30w to start and don't listen to the BS that it's too thick and don't provide proper lubrication.

 

Fred,
It won't have boost at that port unless he keeps his foot in it. Anytime idling or cruse it will have vacuum the same way it works normally. Only under boost will it close that port off.

 

I don't have a line going from the throttle body to the valve cover. The ports are capped off. My line from the pass. side rear valve cover goes to the duct in front of the supercharger. But then I have the pcv line t'd into the same area in the duct. It seems that I would have vacuum from both lines if they are in the same place?

 

The only time my dipstick pops out is at WOT.

 

Yep,boost is pressurizing the base. Put in the check and that should cure it.