Re: Beginners question sorry
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Re: Beginners question sorry
- From: Gary Pavlovich <glpavlovich@xxxxxxx>
- Date: Fri, 11 Dec 2009 09:45:51 -0800
Joey,
Very cool story. Please pass along my contact information to him as I would
like to see pictures of his '56 Plymouth and "talk" to him about it; I still
have my '56 Plymouth from High School and it will receive my modified Poly
engine.
Gary Pavlovich
----- Original Message -----
From: "Joey" <jake4@xxxxxxxxxx>
To: <1962to1965mopars@xxxxxxxxxx>
Sent: Friday, December 11, 2009 2:48 AM
Subject: Re: Beginners question sorry
I have a retired Dana engineer storing his 56 Plymouth in my shop, he has
owned the car since 59' and has shown me time slips from back in the 60's
@ Union Grove dragway where this car ran in the 12's with a dual quad
Poly. The car currently has a healthy 440, 727 combo that he is trying to
sell so he can revert back to a combination of a Poly backed by a Doug
Nash 5-speed. Poly heads seem to be a rather rabid crowd.
Joey
----- Original Message -----
From: "MO ( Steve Mick)" <micher@xxxxxxxxxxxxxxx>
To: <1962to1965mopars@xxxxxxxxxx>
Sent: Friday, December 11, 2009 1:48 AM
Subject: Re: Beginners question sorry
Thanks Gary for the poly lesson. I never knew much about them. I just
know the old 318 ran pretty good !................................MO
----- Original Message -----
From: "Gary Pavlovich" <glpavlovich@xxxxxxx>
To: <1962to1965mopars@xxxxxxxxxx>
Sent: Thursday, December 10, 2009 11:52 PM
Subject: Re: Beginners question sorry
Dave,
The 318A "Poly" engine that many refer to is nicknamed a "Poly" because
the head design is a Polyspherical combustion chamber with canted valves
(angled intake & offset from the exhaust - not in the same plane and
side by side as the Wedge chamber) as opposed to a HEMIspherical
chamber.
The Plymouth Poly was produced from 1956-66 as a 277, 301, 303, 313,
318, and 326 (1959 Dodge only) and shares many of the same parts as the
later 273/318/340/360LA Wedge-head engines. Sometimes the
aforementioned Wedge-head engines are mistakenly called "A" engines
which can be confusing.
Interestingly, the modern 4.7 Chrysler engines are a Polyspherical
chamber design and not a wedge design; even the new HEMI's are not true
90degree Hemispherical valve layout.
The BMEP, brake-mean-effective-pressure of a Poly engine is far superior
to the Wedge chamber and slightly behind the HEMI;
"...the poly engine had one absolutely unique feature: its volumetric
efficiency. If the Mopar figures as found in the Plymouth factory manual
are to be believed, torque of the poly 318 was 345 lb.ft. Now, take
torque and divide it by cubes, then multiply this by 151, and you get
brake mean effective pressure (bmep). Try it for your self: bmep for the
poly 318 is 164 psi. (Again, that's the figure Plymouth gives). That is
near to the theoretical limit for an unsupercharged engine (and that's
with the old log-type exhaust manifolds too) and is very close to the
426 hemi's bmep of 173psi, which had all those performance-designed
components. The bmep figure purely reflects breathing efficiency
(proportional use of the charge coming into the engine), and is a
product of the head, as opposed to the block, which just needs to
suck/blow as rapidly as possible without flying into little pieces..."
Gary Pavlovich
----- Original Message -----
From: "Dave Isle" <mnwildpunk@xxxxxxxxx>
To: <1962to1965mopars@xxxxxxxxxx>
Sent: Thursday, December 10, 2009 8:56 PM
Subject: Beginners question sorry
I see a lot of you guys saying you have a poly this or a poly that. I
know it is a type of engine but which one is it and what makes it a
poly.
Thank you for being patient and answering this probably
silly question. Dave
Sent via BlackBerry by AT&T
----
Please address private mail -- mail of interest to only one person --
directly to that person. I.e., send parts/car transactions and
negotiations as well as other personal messages only to the intended
recipient, not to the Clubhouse public address. This practice will
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'62 to '65 Mopar Clubhouse Discussion Guidelines:
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----
Please address private mail -- mail of interest to only one person --
directly to that person. I.e., send parts/car transactions and
negotiations as well as other personal messages only to the intended
recipient, not to the Clubhouse public address. This practice will
protect your privacy, reduce the total volume of mail and fine tune the
content signal to Mopar topic. Thanks!
'62 to '65 Mopar Clubhouse Discussion Guidelines:
----
Please address private mail -- mail of interest to only one person --
directly to that person. I.e., send parts/car transactions and
negotiations as well as other personal messages only to the intended
recipient, not to the Clubhouse public address. This practice will
protect your privacy, reduce the total volume of mail and fine tune the
content signal to Mopar topic. Thanks!
'62 to '65 Mopar Clubhouse Discussion Guidelines:
----
Please address private mail -- mail of interest to only one person --
directly to that person. I.e., send parts/car transactions and
negotiations as well as other personal messages only to the intended
recipient, not to the Clubhouse public address. This practice will protect
your privacy, reduce the total volume of mail and fine tune the content
signal to Mopar topic. Thanks!
'62 to '65 Mopar Clubhouse Discussion Guidelines:
----
Please address private mail -- mail of interest to only one person -- directly to that person. I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic. Thanks!
'62 to '65 Mopar Clubhouse Discussion Guidelines:
http://www.1962to1965mopar.ornocar.org/mletiq.html.
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