[DeTomaso] Dogbone airfilter questions->Offset filter base installation

Tue Nov 22 10:43:49 EST 2011

Looks nice and you're happy, that's all that matters.

Michael

On Tue, Nov 22, 2011 at 10:28 AM, Mikael <mikael_hass at mail.tele.dk> wrote:

> “Let us know how it works and share photos when installed.”****
>
> ** **
>
> I’ve now got the non-dogbone filter installed, ordinary parts except the
> offset base. And much cheaper. ****
>
> ** **
>
> Pictures at:****
>
> http://www.poca.com/index.php/gallery/?g2_itemId=34203****
>
> ** **
>
> ** **
>
> It worked out fine. The base does ride on the rear float level nut/screw
> if you have center hung floats. So I had to drill a hole to clear it. I
> also had to cut a bit in the filter, that took the most time. I like the
> end result, it’s lower, there’s more area, it fits perfectly in front of
> the rear deck lid. I can see out the back window (though raising the mirror
> would also help), and I have 16mm between vent tubes and bottom of lid,
> minimum is supposed to me 3/8”=9.5mm.****
>
> ** **
>
> Beware that the offset base moves the filter so far forward that it shares
> the space with the distributor. It wasn’t a problem for me since my carb
> sits so high.****
>
> ** **
>
> I know many don’t like the filtered top. Here’s my theory on why some see
> HP loss when installing, and why I still think it’s good for me. Just a
> theory…****
>
> *-If the engine and carb are so small that the filtering area of the air
> filter is not the bottleneck, then maybe the confused airflow resulting
> from a filtered lid can result in lost HP. But in a high HP engine with a
> proper sized carb, where the air filter is the bottleneck, I doubt a
> filtered top will decrease HP. *
>
> Can’t prove it of course, but I’m 100% sure my old small air filter was a
> bottleneck.****
>
> ** **
>
> Mikael****
>
> ** **
>
> *Fra:* michael at michaelshortt.com [mailto:michaelsavga at gmail.com]
> *Sendt:* 3. november 2011 15:10
> *Til:* Mikael
> *Cc:* Roland Jaeckel; detomaso at realbig.com; Will Kooiman
> *Emne:* Re: [DeTomaso] Dogbone airfilter questions****
>
> ** **
>
> Let us know how it works and share photos when installed.****
>
> Good luck.****
>
> Michael****
>
> On Nov 3, 2011 9:52 AM, "Mikael" <mikael_hass at mail.tele.dk> wrote:****
>
> Thanks for answers. After Summit'ing a bit, I found that I can actually get
> an offset 14" base, needed to clear the rear lid. It's almost as if it was
> designed to help Pantera owners, but it's actually to clear the GM HEI.
>
> If I combine that with just a 2" tall filter element and a filtered top, I
> get approx. 220 square inches of area. The dogbone with 2 filters give
> approx. 110 sq ", and with 4 filters 220 sq ". And I get more visibility
> out
> of the rear window, plus it's adjustable (by buying 14" filters of
> different
> heights). Plus I save $200. And since some of the air comes from above
> instead of all of it having to turn 90 degrees to enter the carb, I'm sure
> it's less restrictive than the dogbone. Maybe not enough to see even one HP
> on a dyno, but still :-)
>
> So here's what I ended up with:
> http://www.summitracing.com/parts/SUM-239142/
> http://www.summitracing.com/parts/TRD-2231/
> http://www.summitracing.com/parts/TRD-2430/
> Total cost $115
>
> Mikael
>
> -----Oprindelig meddelelse-----
> Fra: Will Kooiman [mailto:wkooiman at earthlink.net]
> Sendt: 3. november 2011 14:24
> Til: 'Roland Jaeckel'; 'Mikael'; detomaso at realbig.com
> Emne: RE: [DeTomaso] Dogbone airfilter questions
>
> I have seen this discussed several times since I've been involved with
> Panteras (~10 years).  Some say it is restrictive.  Others say it isn't.
>
> We tested the dogbone during a dyno day in 2005.  The top dog made 347 HP
> at
> the rear wheels.  We removed the dogbone air cleaner, and the power jumped
> to 348 HP.  This was on a 377 stroker, dogbone, no spacer between the air
> cleaner and carb, and single filters on each side.
>
> It was also in Houston in the summer (hot).
>
> I've seen too many people say that it is restrictive, though.  I'm guessing
> that it depends on the application.
>
> -----Original Message-----
> From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com]
> On
> Behalf Of Roland Jaeckel
> Sent: Thursday, November 03, 2011 4:41 AM
> To: Mikael; detomaso at realbig.com
> Subject: Re: [DeTomaso] Dogbone airfilter questions
>
> I had it on my 427 stroker.
> It was restrictive even with two filterelement on both side.
> It sucks hot air from the engine compartment, whitch also limits the power.
>
> I had a big airfilter housing from a Mercedes G 400 CDI diesel in my right
> wheelhouse and an air openig to the side.
> That did the trick. Quite on full throttle and no power loss when warm.
>
> Roland
>
> ----- Original Message -----
> From: "Mikael" <mikael_hass at mail.tele.dk>
> To: <detomaso at realbig.com>
> Sent: Thursday, November 03, 2011 10:09 AM
> Subject: [DeTomaso] Dogbone airfilter questions
>
>
> >I know this has been discussed, and on the PI Forum I searched and got a
> >lot
> > of info, but no real conclusion. First, the reason I want it is not
> bling,
> > it's so I can look out my rear window. But I don't want to restrict
> > performance.
> >
> >
> >
> > Here are some of the questions that are still open for me:
> >
> > -Who has it, are you happy with it?
> >
> > -Is it restrictive, I need air for a 600HP 408 engine, using a single
> > Holley
> > 850?
> >
> > -If the filter area is the restriction, can I just double filter it, two
> > on
> > each side?
> >
> > -If it's the distance above the carb, how far is it from the top of the
> > vent
> > tubes?
> >
> > -The distance over the carb could be remedied by a carb to air cleaner
> > spacer?
> >
> >
> >
> > Of course if Holley has done the work properly, it won't restrict flow on
> > the biggest 5 1/8 neck carb, and won't be too close to the vent tubes.
> > Have
> > they?!
> >
> >
> >
> > Summit has Holley version for a whopping $300
> >
> > http://www.summitracing.com/parts/HLY-64280/
> >
> >
> >
> > Mikael
> >
> >
> >
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-- 

Michael L. Shortt
Savannah, Georgia
www.michaelshortt.com
michael at michaelshortt.com
912-232-9390

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