LS powered 240z track car, oil spilling out breather
#1
LS powered 240z track car, oil spilling out breather
Road racers, I need a little help!
I installed an LS6 in my old z car earlier this year. My first track day I found that under hard right turns the oil would spill out of the breather on the left valve cover. It was a small breather pressed into the stock grommet. My solution was this:
This is a weld-on kit from Speedway Motors, the tube is about three inches long with a pressed in baffle. Unfortunately the problem was not solved. The next track day the oil spilled out again on hard right handers.
For comparison, I took a look at a friends stock 2005 vette and found the breather nipple on the valve cover is plugged. Is this the case on newer LS engines (no breather)?
I installed an LS6 in my old z car earlier this year. My first track day I found that under hard right turns the oil would spill out of the breather on the left valve cover. It was a small breather pressed into the stock grommet. My solution was this:
This is a weld-on kit from Speedway Motors, the tube is about three inches long with a pressed in baffle. Unfortunately the problem was not solved. The next track day the oil spilled out again on hard right handers.
For comparison, I took a look at a friends stock 2005 vette and found the breather nipple on the valve cover is plugged. Is this the case on newer LS engines (no breather)?
#3
#4
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Pull the valve cover and tach a piece of sheet aluminum under the baffle. Leave the 4 sides open, also lower the shift rpm to 5 or 55 hundred rpm.
Also put some steel wool under the breather.
A moroso catch van with breather would be better.
http://speedtalk.com/forum/viewtopic.php?f=1&t=27030
Also put some steel wool under the breather.
A moroso catch van with breather would be better.
http://speedtalk.com/forum/viewtopic.php?f=1&t=27030
#5
Pull the valve cover and tach a piece of sheet aluminum under the baffle. Leave the 4 sides open, also lower the shift rpm to 5 or 55 hundred rpm.
Also put some steel wool under the breather.
A moroso catch van with breather would be better.
http://speedtalk.com/forum/viewtopic.php?f=1&t=27030
Also put some steel wool under the breather.
A moroso catch van with breather would be better.
http://speedtalk.com/forum/viewtopic.php?f=1&t=27030
Exactly what I was thinking! Just need to be sure I have room inside the cover, the rocker (Yella Terra) is pretty close. I bought some 3M stuff (looks like scotchbrite but has bigger pores). So the plan is to install a baffle plate inside the cover if there's room, put the 3M stuff above the baffle that's already installed in the Speedway tube, and install a catch can.
If there's no room for the baffle plate, I'm going to move the breather to the center of the valve cover. Hopefully that will stop the "right hander effect" of oil sloshing from front to back, hitting the radius on the back of the head, and straight up the breather tube.
I'll just add that in my case rpms are not part of the problem. Straight line acceleration, shifting at 7300 rpm, dyno pulls, etc. have not caused this issue. On the first track day with this engine, it did it on the first lap (smoke coming off the exhaust kind of gave it away).
#7
yea, you definately need a catch can setup - we had the same issues when translplanting the LSmotors into the Panoz cars -- the Moroso does a great job.
I am also thinking of running a line from the petcock valve back to the oil pan -- then, no worries about oil loss (which is probably only a pint after a hard weekend) or blow by.
I am also thinking of running a line from the petcock valve back to the oil pan -- then, no worries about oil loss (which is probably only a pint after a hard weekend) or blow by.
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#9
I pulled the valve cover yesterday, cleaned it, threw it in the oven for 20 minutes (don't tell my wife), and welded in this little baffle. I think it will stop the majority of the oil from blasting straight up the tube. I couldn't believe how much oil was getting past the baffle in the Speedway Motors part. Hopefully this does the trick.
Before:
After:
A good start on my catch can:
Speedway Motors tube baffle:
Next track day is a week from today so I'll definitely post the results. I'm hoping to find very little oil in the catch can.
Before:
After:
A good start on my catch can:
Speedway Motors tube baffle:
Next track day is a week from today so I'll definitely post the results. I'm hoping to find very little oil in the catch can.
#11
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the LS1 heads drain toward the valley with only a very shallow angle, and so the heads readily pool oil under the valve covers under lateral accel. The crankcase vent location at the valve covers will always carry some oil with it since it pools under the vent during certain conditions. The better place to vent the crankcase is from the valley, such as with the LS6 vented/baffled valley cover.
#13
the LS1 heads drain toward the valley with only a very shallow angle, and so the heads readily pool oil under the valve covers under lateral accel. The crankcase vent location at the valve covers will always carry some oil with it since it pools under the vent during certain conditions. The better place to vent the crankcase is from the valley, such as with the LS6 vented/baffled valley cover.
Anyone running the valley breather to a catch can? I haven't checked the intake for oil yet.
We had a little track night on Saturday and it worked fine. I ran it in five 15-20 minute sessions on a very tight and twisty track. I checked the catch can and found about 1/4 quart of oil or less in it. I'm satisfied for now.
Here's a little trackside video my friend took with his phone:
http://s656.photobucket.com/albums/u..._98-iPhone.mp4
#16
Back on topic, I did find some oil in the tube after the PCV so I'm sure it's getting in the intake. I think I'll need to build a small sealed type catch can in the pcv line too.