RE: milling heads
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RE: milling heads
- From: Steven Charette <stevec@xxxxxxxxxxxxxxxxxxxx>
- Date: Mon, 22 Feb 2010 10:07:05 -0500
Ed,
Okay. Without having a set of 452's in front of me I recall they
are open chamber. Since they were used on 440's I'll use 4.32" as the
diameter of the chamber (you can re-run the math by substituting the correct
diameter in the formula).
The formula I'll use to calculate the volume (there are others) is
Bore X Bore X .7854 X Height. So...
4.32 X 4.32 = 18.6624 square inches.
This would calculate the area of a square, so to figure the area of
the circle inscribed within the square, we multiply by .7854 to give us the
area of this flat "cylinder".
18.6624 X .7854 = 14.6575 square inches
We want to calculate the volume of .010" of this cylinder, so...
14.6575 x .010 = .146575 cubic inches. 1 cubic inch - 16.387 cubic
centimeters (cc) so if we multiply that out...
.146575 cu in x 16.387 = 2.4 cubic centimeters.
So for every .010" you mill a head with a chamber diameter of 4.32",
you decrease the volume of the chamber by 2.4 cc. To decrease the volume 4cc
you would remove 2.4 X 1.666 (to infinity).
So to verify our calculations we'll plug the numbers into the
formula above:
4.32 X 4.32 X .7854 X .0166666 = .2442898 cubic inches x 16.387 =
4.003 cc
So to reduce your chamber volume by 4cc, you would remove
approximately .016" from the head surface. This works until you get into
the radius or completely remove the open quench area then some additional
figuring is required.
BTW, if you remove .016" from the head surface, don't forget to
remove 1.6 (1.6 being the number of .010" units we've removed from the head
surface) X the .0123" number from the intake surface, or .01968" from the
intake surface.
I don't know about you guys but if they'd taught math this way in
high school, I might have actually gone to class!
SC
-----Original Message-----
From: ed keaton [mailto:gtx69@xxxxxxx]
Sent: Friday, February 19, 2010 8:18 PM
To: 1962to1965mopars@xxxxxxxxxx
Subject: Re: milling heads
Yes I am talking about the 452 heads .Metal gasket is about .019 felpro.039
----- Original Message -----
From: Gary<mailto:mopar413@xxxxxxxxxxx>
To: 1962to1965mopars@xxxxxxxxxx<mailto:1962to1965mopars@xxxxxxxxxx>
Cc: MO ( Steve Mick)<mailto:micher@xxxxxxxxxxxxxxx>
Sent: Friday, February 19, 2010 7:41 PM
Subject: Re: milling heads
Don't forget that the head gasket also will determine cc. Metal gasket
will make more compression. Felpro will lower compression. that will also
affect cc.
---- "MO ( Steve Mick)"
<micher@xxxxxxxxxxxxxxx<mailto:micher@xxxxxxxxxxxxxxx>> wrote:
>
> I am assuming we are talking milling the heads and not the deck? I too
> would like to know the answer to to this question as I have the 452
heads
> and would like to go to about 86-88
> cc's...................................MO
> ----- Original Message -----
> From: "ed keaton" <gtx69@xxxxxxx<mailto:gtx69@xxxxxxx>>
> To: <1962to1965mopars@xxxxxxxxxx<mailto:1962to1965mopars@xxxxxxxxxx>>
> Sent: Friday, February 19, 2010 3:54 PM
> Subject: Re: milling heads
>
>
> >
> >
> > I am milling a set of 452's.Had the heads cc they checked out at 92 cc
> > need to get down to 88 cc.That is why I need to know how much does
each
> > .010 milled off reduce the cc by.
> > ----- Original Message -----
> > From: Steven
Charette<mailto:stevec@xxxxxxxxxxxxxxxxxxxx<mailto:stevec@xxxxxxxxxxxxxxxxxx
et>>
> > To:
1962to1965mopars@xxxxxxxxxx<mailto:1962to1965mopars@xxxxxxxxxx<mailto:1962to
1965mopars@xxxxxxxxxx%3Cmailto:1962to1965mopars@xxxxxxxxxx>>
> > Sent: Friday, February 19, 2010 11:39 AM
> > Subject: RE: milling heads
> >
> >
> >
> > Ed,
> > What heads are you milling? It depends on if the heads are open or
> > closed chamber - milling an open chamber head will reduce the chamber
> > volume
> > by more than milling a closed chamber head.
> >
> > Without crunching the numbers (I can get you the formulas if needed)
> > the old DC performance Bible states that (and I'll paraphrase)
milling
> > the
> > late model open chamber heads .060" increases compression 1.5 points,
so
> > .010" would get you roughly 1/4 point of compression. On the older
> > closed
> > chamber heads ('62-65 vintage) .060" only gets you about 1/2 point,
or
> > .08
> > points at .010"
> >
> > For greater accuracy you would have to calculate the area of the
> > chamber at the head surface, then calculate for volume at .010".
> >
> > For big blocks (can't say whether the angles are the same on others)
> > mill the intake face .0123" for each .010" milled from the deck
surface.
> >
> > SC
> >
> > -----Original Message-----
> > From: ed keaton [mailto:gtx69@xxxxxxx]
> > Sent: Wednesday, February 17, 2010 9:04 PM
> > To: 1962to1965mopars
> > Subject: milling heads
> >
> >
> >
> > Any one know for every 010 milled off is equal to how many cc's .How
much
> > off intake size of the head per 010 also?
> > [Non-text portions of this message have been removed]
> >
> >
> > ----
> > Please address private mail -- mail of interest to only one person --
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> > as well as other personal messages only to the intended recipient,
not to
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Mopar
> > topic. Thanks!
> >
> > 1962 to 1965 Mopar Clubhouse Discussion Guidelines:
> >
> >
http://www.1962to1965mopar.ornocar.org/mletiq.html<http://www.1962to1965mopa
r.ornocar.org/mletiq.html<http://www.1962to1965mopar.ornocar.org/mletiq.html
%3Chttp://www.1962to1965mopar.ornocar.org/mletiq.html>>
> > and
> >
> >
http://www.1962to1965mopar.ornocar.com/general_disclaimer.html<http://www.19
62to1965mopar.ornocar.com/general_disclaimer.html<http://www.1962to1965mopar
.ornocar.com/general_disclaimer.html%3Chttp://www.1962to1965mopar.ornocar.co
m/general_disclaimer.html>>.
> >
> >
> > ----
> > 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!
> >
> > 1962 to 1965 Mopar Clubhouse Discussion Guidelines:
> >
> >
http://www.1962to1965mopar.ornocar.org/mletiq.html<http://www.1962to1965mopa
r.ornocar.org/mletiq.html<http://www.1962to1965mopar.ornocar.org/mletiq.html
%3Chttp://www.1962to1965mopar.ornocar.org/mletiq.html>>
> > and
> >
http://www.1962to1965mopar.ornocar.com/general_disclaimer.html<http://www.19
62to1965mopar.ornocar.com/general_disclaimer.html<http://www.1962to1965mopar
.ornocar.com/general_disclaimer.html%3Chttp://www.1962to1965mopar.ornocar.co
m/general_disclaimer.html>>.
> >
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
> >
> > ----
> > 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!
> >
> > 1962 to 1965 Mopar Clubhouse Discussion Guidelines:
> >
http://www.1962to1965mopar.ornocar.org/mletiq.html<http://www.1962to1965mopa
r.ornocar.org/mletiq.html> and
> >
http://www.1962to1965mopar.ornocar.com/general_disclaimer.html<http://www.19
62to1965mopar.ornocar.com/general_disclaimer.html>.
> >
> >
> >
>
>
> ----
> 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!
>
> 1962 to 1965 Mopar Clubhouse Discussion Guidelines:
>
http://www.1962to1965mopar.ornocar.org/mletiq.html<http://www.1962to1965mopa
r.ornocar.org/mletiq.html> and
http://www.1962to1965mopar.ornocar.com/general_disclaimer.html<http://www.19
62to1965mopar.ornocar.com/general_disclaimer.html>.
>
>
----
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!
1962 to 1965 Mopar Clubhouse Discussion Guidelines:
http://www.1962to1965mopar.ornocar.org/mletiq.html<http://www.1962to1965mopa
r.ornocar.org/mletiq.html> and
http://www.1962to1965mopar.ornocar.com/general_disclaimer.html<http://www.19
62to1965mopar.ornocar.com/general_disclaimer.html>.
[Non-text portions of this message have been removed]
----
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!
1962 to 1965 Mopar Clubhouse Discussion Guidelines:
http://www.1962to1965mopar.ornocar.org/mletiq.html and
http://www.1962to1965mopar.ornocar.com/general_disclaimer.html.
----
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!
1962 to 1965 Mopar Clubhouse Discussion Guidelines:
http://www.1962to1965mopar.ornocar.org/mletiq.html and http://www.1962to1965mopar.ornocar.com/general_disclaimer.html.
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