[DeTomaso] Dog bone air cleaner and valve cover venting

[Asa Jay Laughton]

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 I’m back in the shop.

Asa  Jay

Sent via radio waves

> On Jun 11, 2024, at 09:02, Larry Stock <larrys at panteraparts.com> wrote:
> 
> 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
> 
> 
> On 6/11/24, 8:28 AM, "DeTomaso on behalf of Asa Jay Laughton via DeTomaso" <detomaso-bounces at server.detomasolist.com <mailto:detomaso-bounces at server.detomasolist.com> on behalf of 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 <asajay at asajay.com <mailto:asajay at asajay.com>> wrote:
>> 
>> 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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