[DeTomaso] Dog bone air cleaner and valve cover venting

Mike Drew mikeldrew at aol.com
Tue Jun 11 13:46:48 EDT 2024 

Jack,

Can you elaborate further?  I always believed there was a single design that was marketed at different times under different brand names, but they were identical. Am I wrong on that?

Mike




Sent from my iPad

> On Jun 11, 2024, at 10:00, jderyke--- via DeTomaso <detomaso at server.detomasolist.com> wrote:
> 
>    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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>   2. mailto:larrys at panteraparts.com
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>   5. mailto:asajay at asajay.com
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