[DeTomaso] Dog bone air cleaner and valve cover venting

Tue Jun 11 16:58:37 EDT 2024

Agreed.  It really seemed bizarre to me which is why I asked.  Consensus seems to be on the side of leaving one in place and go to a PCV on the other to manifold vacuum.

Asa  Jay

Sent via radio waves

> On Jun 11, 2024, at 13:23, Mike Drew <mikeldrew at aol.com> wrote:
> 
> Exactly.
> 
> The reason the air cleaner is hooked to the valve cover is not to let the air cleaner suck in from the engine. It’s to allow the valve cover to suck filtered air in from the air cleaner. The air goes in a loop, from the air cleaners to the valve cover, through the engine, out the PCV valve and into the base of the carburetor, and from there, it’s drawn through the intake manifold and is combusted.
> 
> The alternate scheme is ti just have breathers which act as simple vents. These can sometimes drool oil out onto the exhaust if the car is driven hard.
> 
> Having both valve covers hooked to the air cleaner with no vacuum source pulling anywhere is just silly. It’s easy to understand how the engine would then suck oil from the valve covers.
> 
> Easily fixed with the introduction of a PCV valve on one valve cover.
> 
> Mike
> 
> Sent from my iPad
> 
>> On Jun 11, 2024, at 13:13, Forest Goodhart <forestg at att.net> wrote:
>> 
>>    One side should have a pcv valve connected to manifold vacuum and the
>>  other side should be connected to the air cleaner. The pcv is to
>>  evacuate the crankcase into the intake to burn off any oil mist or
>>  hydrocarbons and the other side is to provide a clean air supply to
>>  make up what is drawn off through the pcv.
>> 
>>  On Tuesday, June 11, 2024 at 09:19:31 AM PDT, Asa Jay Laughton via
>>  DeTomaso <detomaso at server.detomasolist.com> wrote:
>>  The breathers have restrictions in them.  Like a flat piece of sheet
>>  metal that is partially punched and slightly bent up into the
>>  breather.  Definitely not a drain back design.  In addition, the lines
>>  go up over the covers, then back down to the intake runners for an
>>  attachment point and then up to the air cleaner.  I can send photos
>>  later tonight when Iam back in the shop.
>>  Asa  Jay
>>  Sent via radio waves
>>>> On Jun 11, 2024, at 09:02, Larry Stock <[1]larrys at panteraparts.com>
>>>  wrote:
>>> 
>>> i>>?What do the baffles in the valve covers look like? Did they
>>  bother to correctly install the baffles? It doesn't sound like it, but
>>  I would expect the breather lines to be set up to drain back into the
>>  valve covers.
>>> Larry
>>> 
>>> 
>>> i>>?On 6/11/24, 8:28 AM, "DeTomaso on behalf of Asa Jay Laughton via
>>  DeTomaso" <[2]detomaso-bounces at server.detomasolist.com
>>  <mailto:detomaso-bounces at server.detomasolist.com> on behalf of
>>  [3]detomaso at server.detomasolist.com
>>  <mailto:detomaso at server.detomasolist.com>> wrote:
>>> 
>>> 
>>> Photo of the setup:
>>> 
>>> 
>>> 
>>> 
>>> The two huge lines coming off the back of the air cleaner go to the
>>  breather on each valve cover.
>>> 
>>> 
>>> The large vacuum line at the base of the carb goes directly to the
>>  brake booster.
>>> 
>>> 
>>> Asa Jay
>>> 
>>> 
>>> Sent via radio waves
>>> 
>>> 
>>>> On Jun 11, 2024, at 08:23, Asa Jay Laughton <[4]asajay at asajay.com
>>  <mailto:asajay at asajay.com>> wrote:
>>>> 
>>>> i>>?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 Iam 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 itas pushing oil up the breathers to
>>  the air cleaner. Or the air cleaner is generating enough vacuum that
>>  itas pulling a good deal of oil from the breathers.
>>>> 
>>>> In a stock setup Iam used to one valve cover being vented to an air
>>  cleaner and the other running through a PCV. Those builds without a PCV
>>  Iave seen and used a breather to atmosphere. Iave never seen both valve
>>  covers attached to the air cleaner like this.
>>>> 
>>>> Iam 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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>> References
>> 
>>  1. mailto:larrys at panteraparts.com
>>  2. mailto:detomaso-bounces at server.detomasolist.com
>>  3. mailto:detomaso at server.detomasolist.com
>>  4. mailto:asajay at asajay.com
>>  5. mailto:DeTomaso at server.detomasolist.com
>>  6. http://server.detomasolist.com/mailman/listinfo/detomaso
>>  7. http://server.detomasolist.com/mailman/listinfo/detomaso
>>  8. mailto:DeTomaso at server.detomasolist.com
>>  9. http://server.detomasolist.com/mailman/listinfo/detomaso
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> 