[DeTomaso] Dog bone air cleaner and valve cover venting

Tue Jun 11 13:00:08 EDT 2024

 There are three (3.0) known makers of 'dogbone' air cleaners and they're all somewhat different. Also, many have been modified with a 3/4" or 1" spacer that lets more air into the carb. Which got tested?
    On Tuesday, June 11, 2024 at 09:33:50 AM PDT, Will Kooiman <will.kooiman at gmail.com> wrote:   

 We tested dog bone air cleaners at our Dyno Day in 2005.

Results were presented in Myth Busters format.

>From the newsletter:

Myth#2 – The Dogbone Air cleaner (B&M, Airtech, etc.) is constrictive on carbs with a choke horn because the air cleaner sits low over the carb.

    This test was performed at the request of Gray Gregory whose 377 stroker topped with a dogbone air cleaner made an impressive 347 HP at 6400 rpm.  His carb has a choke horn, no spacer between the air cleaner and the carb, and a single filter on each side.

    The result – a one horsepower (loss) at 6400 with the dogbone versus no aircleaner at all.  That’s right – one horsepower on a 377 stroker.

    Myth busted.  At least in Texas, the Dogbone air cleaner does not restrict, even on a 377 stroker.

And, if there's no restriction, there would be insignificant vacuum, so it probably isn't sucking oil.  More likely, excessive blowby and as Larry suggested, insufficient baffles.

Plus, there really should be a PCV on one valve cover.

Plus plus, I've been running breathers that add an inch or two above the valve cover.  I don't recall what they originally came on - Ford, but I'm not certain which year/model.  They screw into the standard 351C valve cover, and then the breather pushes on the "tube - with baffles".

On 6/11/24, 12:08 PM, "DeTomaso on behalf of Larry Stock" <detomaso-bounces at server.detomasolist.com <mailto:detomaso-bounces at server.detomasolist.com> on behalf of larrys at panteraparts.com <mailto: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> <mailto: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> <mailto: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> <mailto: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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-------------- next part --------------
   There are three (3.0) known makers of 'dogbone' air cleaners and
   they're all somewhat different. Also, many have been modified with a
   3/4" or 1" spacer that lets more air into the carb. Which got tested?

   On Tuesday, June 11, 2024 at 09:33:50 AM PDT, Will Kooiman
   <will.kooiman at gmail.com> wrote:
   We tested dog bone air cleaners at our Dyno Day in 2005.
   Results were presented in Myth Busters format.
   From the newsletter:
   Myth#2 a The Dogbone Air cleaner (B&M, Airtech, etc.) is constrictive
   on carbs with a choke horn because the air cleaner sits low over the
   carb.
       This test was performed at the request of Gray Gregory whose 377
   stroker topped with a dogbone air cleaner made an impressive 347 HP at
   6400 rpm.  His carb has a choke horn, no spacer between the air cleaner
   and the carb, and a single filter on each side.
       The result a a one horsepower (loss) at 6400 with the dogbone
   versus no aircleaner at all.  Thatas right a one horsepower on a 377
   stroker.
       Myth busted.  At least in Texas, the Dogbone air cleaner does not
   restrict, even on a 377 stroker.
   And, if there's no restriction, there would be insignificant vacuum, so
   it probably isn't sucking oil.  More likely, excessive blowby and as
   Larry suggested, insufficient baffles.
   Plus, there really should be a PCV on one valve cover.
   Plus plus, I've been running breathers that add an inch or two above
   the valve cover.  I don't recall what they originally came on - Ford,
   but I'm not certain which year/model.  They screw into the standard
   351C valve cover, and then the breather pushes on the "tube - with
   baffles".
   i>>?On 6/11/24, 12:08 PM, "DeTomaso on behalf of Larry Stock"
   <[1]detomaso-bounces at server.detomasolist.com
   <mailto:detomaso-bounces at server.detomasolist.com> on behalf of
   [2]larrys at panteraparts.com <mailto: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
   i>>?On 6/11/24, 8:28 AM, "DeTomaso on behalf of Asa Jay Laughton via
   DeTomaso" <[3]detomaso-bounces at server.detomasolist.com
   <mailto:detomaso-bounces at server.detomasolist.com>
   <mailto:detomaso-bounces at server.detomasolist.com
   <mailto:detomaso-bounces at server.detomasolist.com>> on behalf of
   [4]detomaso at server.detomasolist.com
   <mailto:detomaso at server.detomasolist.com>
   <mailto: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 <[5]asajay at asajay.com
   <mailto:asajay at asajay.com> <mailto: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

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   5. mailto:asajay at asajay.com
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