[DeTomaso] Intake Manifolds

[Daniel C Jones]

> Would you expect that the results would be similar in a non stroked 351C?

Not necessarily.  The port velocity is higher in the stroked engine.  It
might be a case where the RPM is raised where the cross-over occurs.
However, if the non stroked engine had unported 2V heads, the air flow
relative to the displacement might be similar and it might behave
similarly.  Would be worth testing on the dyno some day...

Dan Jones


On Tue, May 27, 2014 at 4:10 PM, Charles Engles <cengles at cox.net> wrote:

>  Dear Dan,
>
>             You wrote:
>
>
> "I don't think I ever got around to writing up the dyno results but we
> tested several intakes on a* 393C* with ported Aussie 2V iron heads.
> Results in order were:
>
>  1. Parker Funnelweb 2V
>
>  2. Holley Street Dominator 2V
>
>  3. Weiand Xcelerator 2V
>
>  4. Edelbrock RPM Air Gap 2V"
>
> $$$$$$$$$    Would you expect that the results would be similar in a* non
> stroked 351C*?
>
>                      Curious,  Chuck Engles
>
> PS: how goes the Great Cleveland Dyno Project?   Do you have need of
> donations??
>
>
>
>  Note the Edelbrock Air Gap dual plane was beaten by all of the single
> plane intakes tested and the single planes worked better across the entire
> RPM range tested (down to 2500 RPM or so).  However, on a 408C with heads
> with better flowing intake ports (CHI 4V), the Edelbrock RPM Air Gap 2V
> performed much better.  Intake flow is poor relative to the exhaust on the
> iron 2V heads and, once you get into the 400+ HP range, it appears the
> single plane intakes work better because they are less of restriction to
> the marginal 2V cylinder head intake flow.
>
> > The Dominator and the taller single planes will give better high end
>
> numbers but may suck at lower rpm.
>
> Small port (relative to the displacement) single plane intakes often have
> good manners on the street, though that depends upon the specific engine
> combination.
>
> Dan Jones
>
> On Tue, May 27, 2014 at 11:39 AM, Lee, Patrick Q <patrick.q.lee at rbc.com
> >wrote:
>
> >    I run an Edelbrock RPM Air Gap on my 3v 393 and it pulls like crazy
>
> >    from 2500 to 6200 rpm.
>
> >
>
> >    The cam is a Crane 238/248 solid lifter, the carb is a vintage Holley
>
> >    735 jetted up several sizes.
>
> >
>
> >    I think it is one of the best choices for street use. The Dominator
> and
>
> >    the taller single planes will give better high end numbers but may
> suck
>
> >    at lower rpm.
>
> >
>
> >
>
> >
>
> >
>
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-------------- next part --------------
   > Would you expect that the results would be similar in a non stroked
   351C?
   Not necessarily.A  The port velocity is higher in the stroked engine.A
   It might be a case where the RPM is raised where the cross-over
   occurs.A  However, if the non stroked engine had unported 2V heads, the
   air flow relative to the displacement might be similar and it might
   behave similarly.A  Would be worth testing on the dyno some day...
   Dan Jones

   On Tue, May 27, 2014 at 4:10 PM, Charles Engles <[1]cengles at cox.net>
   wrote:

   Dear Dan,

   A A A A A A A A A A A  You wrote:

   "I don't think I ever got around to writing up the dyno results but we
   tested several intakes on a 393C with ported Aussie 2V iron heads.A
   Results in order were:

   A 1. Parker Funnelweb 2V

   A 2. Holley Street Dominator 2V

   A 3. Weiand Xcelerator 2V

   A 4. Edelbrock RPM Air Gap 2V"

   $$$$$$$$$A A A  Would you expect that the results would be similar in a
   non stroked 351C?

   A A A A A A A A A A A A A A A A A A A A  Curious,A  Chuck Engles

   PS: how goes the Great Cleveland Dyno Project?A A  Do you have need of
   donations??

   Note the Edelbrock Air Gap dual plane was beaten by all of the single
   plane intakes tested and the single planes worked better across the
   entire RPM range tested (down to 2500 RPM or so).A  However, on a 408C
   with heads with better flowing intake ports (CHI 4V), the Edelbrock RPM
   Air Gap 2V performed much better.A  Intake flow is poor relative to the
   exhaust on the iron 2V heads and, once you get into the 400+ HP range,
   it appears the single plane intakes work better because they are less
   of restriction to the marginal 2V cylinder head intake flow.

   > The Dominator and the taller single planes will give better high end

   numbers but may suck at lower rpm.

   Small port (relative to the displacement) single plane intakes often
   have good manners on the street, though that depends upon the specific
   engine combination.

   Dan Jones

   On Tue, May 27, 2014 at 11:39 AM, Lee, Patrick Q
   <[2]patrick.q.lee at rbc.com>wrote:

   >A A A  I run an Edelbrock RPM Air Gap on my 3v 393 and it pulls like
   crazy

   >A A A  from 2500 to 6200 rpm.

   >

   >A A A  The cam is a Crane 238/248 solid lifter, the carb is a vintage
   Holley

   >A A A  735 jetted up several sizes.

   >

   >A A A  I think it is one of the best choices for street use. The
   Dominator and

   >A A A  the taller single planes will give better high end numbers but
   may suck

   >A A A  at lower rpm.

   >

   >

   >

   >A A A

   >
   ______________________________________________________________________

   > _

   >

   >A A A  This email may be privileged and/or confidential, and the
   sender does

   >A A A  not waive any related rights and obligations. Any distribution,
   use or

   >A A A  copying of this email or the information it contains by other
   than an

   >A A A  intended recipient is unauthorized. If you received this email
   in

   >A A A  error, please advise the sender (by return email or otherwise)

   >A A A  immediately. You have consented to receive the attached
   electronically

   >A A A  at the above-noted email address; please retain a copy of this

   >A A A  confirmation for future reference.

   >

   >A A A  Ce courriel est confidentiel et protA(c)gA(c). L'expA(c)diteur
   ne

   >A A A  renonce pas aux droits et obligations qui s'y rapportent. Toute

   >A A A  diffusion, utilisation ou copie de ce courriel ou des
   renseignements

   >A A A  qu'il contient par une personne autre que le (les)
   destinataire(s)

   >A A A  dA(c)signA(c)(s) est interdite. Si vous recevez ce courriel par
   erreur,

   >A A A  veuillez en aviser l'expA(c)diteur immA(c)diatement, par retour
   de

   >A A A  courriel ou par un autre moyen. Vous avez acceptA(c) de
   recevoir le(s)

   >A A A  document(s) ci-joint(s) par voie A(c)lectronique AA  l'adresse
   courriel

   >A A A  indiquA(c)e ci-dessus; veuillez conserver une copie de cette

   >A A A  confirmation pour les fins de reference future.

   >

   > _______________________________________________

   >

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   >

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   >

References

   1. mailto:cengles at cox.net
   2. mailto:patrick.q.lee at rbc.com
   3. mailto:DeTomaso at poca.com
   4. http://poca.com/mailman/listinfo/detomaso_poca.com