valve cover venting

surfbeast · 02-13-2004, 09:44 PM

Hey guys,

I asked this on another board with no response so here goes. Both valve covers vent to the intake. One to the plenum and one to the intake tube. This seems like it would draw alot of hot air into the engine. Is it safe to delete these or is the air pulled through the valve covers done for some reason other than emissions?

Snakeman · 02-18-2004, 11:58 AM

the crankcase ventilation system not only helps keep emissions down, it helps your motor breathe and keeps the contaminants from blowby, etc from building up inside the motor so fast.

clean oil is happy oil.

moosejaw · 02-18-2004, 08:51 PM

What he said. Plus piston rings seal better at lower crankcase pressure.

Also, only one tube is actually venting. Air flows from the intake tube (before throttle), into the crankcase, out of the pcv valve, then to the intake manifold. This is because all air entering the engine needs to be measured by the MAF. If it isn't, then it acts like a vacuum leak.

Mike

02-13-2004, 09:44 PM	#1
surfbeast Registered Member Join Date: Feb 2002 Location: Maryville,TN Posts: 415	valve cover venting Hey guys, I asked this on another board with no response so here goes. Both valve covers vent to the intake. One to the plenum and one to the intake tube. This seems like it would draw alot of hot air into the engine. Is it safe to delete these or is the air pulled through the valve covers done for some reason other than emissions? __________________ 98 GT / convertable -98 Saleen engine, Saleen appearance pkg. SHM cams,P&P NPI heads, and so much more!

02-18-2004, 11:58 AM	#2
Snakeman Registered Member Join Date: Apr 1999 Location: Grass Valley, CA, USA Posts: 1,389	the crankcase ventilation system not only helps keep emissions down, it helps your motor breathe and keeps the contaminants from blowby, etc from building up inside the motor so fast. clean oil is happy oil. __________________ LX ~vs~ Camaro

02-18-2004, 08:51 PM	#3
moosejaw Registered Member Join Date: Apr 1999 Location: St.Louis,MO Posts: 274	What he said. Plus piston rings seal better at lower crankcase pressure. Also, only one tube is actually venting. Air flows from the intake tube (before throttle), into the crankcase, out of the pcv valve, then to the intake manifold. This is because all air entering the engine needs to be measured by the MAF. If it isn't, then it acts like a vacuum leak. Mike __________________ Live near St.Louis? Check out Mustang Muscle and Dyno in High Ridge, MO

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