[DeTomaso] Dog bone air cleaner and valve cover venting

Tue Jun 11 12:07:20 EDT 2024

My opinion is that you are probably pulling too much vacuum on the crankcase. One side should be a standard breather cap open to atmosphere, the other a PCV valve (to prevent oil mist being sucked into the line) and line hooked to air cleaner.

Julian
________________________________
From: DeTomaso <detomaso-bounces at server.detomasolist.com> on behalf of Asa Jay Laughton via DeTomaso <detomaso at server.detomasolist.com>
Sent: Tuesday, June 11, 2024 8:22 AM
To: DeTomaso Mail List <detomaso at server.detomasolist.com>
Subject: [DeTomaso] Dog bone air cleaner and valve cover venting

Hi all,
I have a nice Pantera in my shop with something unusual.  It has a Windsor bored and stroked to 427 and on top it has a dog bone air cleaner.  My first thought is that the air cleaner is too small for the engine but I know others on this list have had great success with them so I’m trying not to worry about it.

My bigger concern is this.  Each valve cover is plumbed directly to the dog bone through a breather cap.  When I removed the air cleaner it had a lot of oil in it.  When I disconnected the valve cover lines from the dog bone they had a lot of oil in them.  Quite a bit actually.

Now I figure there are two ways that can contribute to this.  First, too much blow by in the block and it’s pushing oil up the breathers to the air cleaner.  Or the air cleaner is generating enough vacuum that it’s pulling a good deal of oil from the breathers.

In a stock setup I’m used to one valve cover being vented to an air cleaner and the other running through a PCV.  Those builds without a PCV I’ve seen and used a breather to atmosphere.  I’ve never seen both valve covers attached to the air cleaner like this.

I’m soliciting opinions on this setup, good, bad, thoughts, ideas.

Thank you,
Asa  Jay
Pantera Research Institute - Pacific Northwest Chapter

Sent via radio waves
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-------------- next part --------------
   My opinion is that you are probably pulling too much vacuum on the
   crankcase. One side should be a standard breather cap open to
   atmosphere, the other a PCV valve (to prevent oil mist being sucked
   into the line) and line hooked to air cleaner.

   Julian
     __________________________________________________________________

   From: DeTomaso <detomaso-bounces at server.detomasolist.com> on behalf of
   Asa Jay Laughton via DeTomaso <detomaso at server.detomasolist.com>
   Sent: Tuesday, June 11, 2024 8:22 AM
   To: DeTomaso Mail List <detomaso at server.detomasolist.com>
   Subject: [DeTomaso] Dog bone air cleaner and valve cover venting

   Hi all,
   I have a nice Pantera in my shop with something unusual.  It has a
   Windsor bored and stroked to 427 and on top it has a dog bone air
   cleaner.  My first thought is that the air cleaner is too small for the
   engine but I know others on this list have had great success with them
   so I'm trying not to worry about it.
   My bigger concern is this.  Each valve cover is plumbed directly to the
   dog bone through a breather cap.  When I removed the air cleaner it had
   a lot of oil in it.  When I disconnected the valve cover lines from the
   dog bone they had a lot of oil in them.  Quite a bit actually.
   Now I figure there are two ways that can contribute to this.  First,
   too much blow by in the block and it's pushing oil up the breathers to
   the air cleaner.  Or the air cleaner is generating enough vacuum that
   it's pulling a good deal of oil from the breathers.
   In a stock setup I'm used to one valve cover being vented to an air
   cleaner and the other running through a PCV.  Those builds without a
   PCV I've seen and used a breather to atmosphere.  I've never seen both
   valve covers attached to the air cleaner like this.
   I'm soliciting opinions on this setup, good, bad, thoughts, ideas.
   Thank you,
   Asa  Jay
   Pantera Research Institute - Pacific Northwest Chapter
   Sent via radio waves
   _______________________________________________
   Detomaso Email List is not managed by POCA
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