Valve Cover Breathers: What Works?
#12
Registered
So that is something like a victor intake with injector ports? There is probably a manifold vac port behind throttle body. Run a pcv valve from rear breather port to that vac port. Will virtually disappear behind throttle body.
#13
Registered
iTrader: (3)
Last year I switched from the KN style breathers with Merc finned valve covers, to the angle cut Teague style valve covers, with tall stack style breathers.
I ended up having to mount the breathers in the rear, because in front, they would not clear my stellings green headers. I did not have any oil blowing out of them last summer while mounted in the rear.
Prior to that, with the merc finned valve covers, and KN breathers, the way it was setup, was one breather in front on odd bank, one breather in back, on the even bank. I did get a slight mist of oil from both of them equally after a hard run.
I ended up having to mount the breathers in the rear, because in front, they would not clear my stellings green headers. I did not have any oil blowing out of them last summer while mounted in the rear.
Prior to that, with the merc finned valve covers, and KN breathers, the way it was setup, was one breather in front on odd bank, one breather in back, on the even bank. I did get a slight mist of oil from both of them equally after a hard run.
#14
I removed my intake drilled and tapped a hole basically between the dizzy and carb. Believe it was 3/8 pipe. Installed a 3" or so pipe and coupled it to a PCV valve and to manifold vacuum. In this case to the rear of the carb. Then installed breathers to the front of each valve cover. That way it had to pull air through the engine as well as possible. Worked great. Also a valley baffle can be installed which can depend on valve lift.
#15
Registered
Is there any way to get a baffle under the K&N filters? If not, you can raise them up some. You need time for the oil to settle out of suspension. Also, once those filters get soaked with oil, they stop breathing that good. This allows the engine to build some crankcase pressure, which in turn wants to force more oil out of the filters.
A puke tank is the best option. If you go that route, try to run the hoses uphill all the way to the tank. This will allow any oil to drain back into the valve cover once it comes out of suspension.
Eddie
A puke tank is the best option. If you go that route, try to run the hoses uphill all the way to the tank. This will allow any oil to drain back into the valve cover once it comes out of suspension.
Eddie
#17
Registered
Thread Starter
Thanks guys. I found a decent puke tank with dual 1/2" NPT inlets but have not ordered it yet. I plan on running 5/8" line and hose barbs, do you think that is sufficient diameter hoses for the breathers on a 540? Or should I look for something larger?
ICDEDPPL, that is a beautiful setup!
ICDEDPPL, that is a beautiful setup!
#18
VIP Member
VIP Member
I put 2 of these in my boat. One for each engine 1/2 ports
http://www.ebay.com/itm/Polished-Alu...825842&vxp=mtr
http://www.ebay.com/itm/Polished-Alu...825842&vxp=mtr
#19
Registered
Thread Starter
I put 2 of these in my boat. One for each engine 1/2 ports
http://www.ebay.com/itm/Polished-Alu...825842&vxp=mtr
http://www.ebay.com/itm/Polished-Alu...825842&vxp=mtr