PCV Valve - basic question?
Thread Starter
Registered User
Joined: Jun 2016
Posts: 10
From: Munich - Bavaria
PCV Valve - basic question?
Hi,
I have two/three questions about the valve cover outlets of my 455 engine.
On the driver side there is the PCV valve connected to a hose which goes into the air filter housing. This PCV valve is mendatory and cannot change against an open air filter without connections to the filter on the carb? And there is also no other place where the PCV outlet hose can be connected?
On the passenger side there is a breather filter which is connected with the air filter housing on the carb, too. But this filter can be changed against an open filter if you don’t pay attention to eviromental concerns. Is this thought correct?
Thank you!
Trevor
I have two/three questions about the valve cover outlets of my 455 engine.
On the driver side there is the PCV valve connected to a hose which goes into the air filter housing. This PCV valve is mendatory and cannot change against an open air filter without connections to the filter on the carb? And there is also no other place where the PCV outlet hose can be connected?
On the passenger side there is a breather filter which is connected with the air filter housing on the carb, too. But this filter can be changed against an open filter if you don’t pay attention to eviromental concerns. Is this thought correct?
Thank you!
Trevor
Last edited by trevor1400; May 6, 2025 at 01:58 PM.
Thread Starter
Registered User
Joined: Jun 2016
Posts: 10
From: Munich - Bavaria
Thank you for your answers.
It looks like the PCV valve was never connected properly. At least, I've been driving this combination about 14,000 miles without any problems.
I'm just surprised that the last garage which adjusted the carb didn't notice the problem.
It looks like the PCV valve was never connected properly. At least, I've been driving this combination about 14,000 miles without any problems.
I'm just surprised that the last garage which adjusted the carb didn't notice the problem.
Registered User
Joined: Sep 2011
Posts: 2,148
From: Plano, TX
You've got the Hot Rodder setup where both sides are just vented. This is the same as just putting breathers on each valve cover, then wrapping them with rags to catch the oil. Running them up to the air cleaner just lets the engine eat the blowby gasses instead of spreading oil in the engine bay.
Assuming there's actually a PCV valve in the driver side valve cover grommet then just connect that hose to the base of the carb. You must have the valve in that hose - the valve limits how much air passes through.
It's not critical. If everything has been find for 14k miles then you won't notice a difference by changing it - except you'll need to adjust the idle tuning because there will be a lot more air being pulled through the carb.
Assuming there's actually a PCV valve in the driver side valve cover grommet then just connect that hose to the base of the carb. You must have the valve in that hose - the valve limits how much air passes through.
It's not critical. If everything has been find for 14k miles then you won't notice a difference by changing it - except you'll need to adjust the idle tuning because there will be a lot more air being pulled through the carb.
Thread
Thread Starter
Forum
Replies
Last Post
