[Chrysler300] Carbs and clay

["Rich Barber" <c300@xxxxxxx>]

Now how much air can an engine pull in?  My calculations show a 392 cubic
inch, four stroke cycle engine displaces a total of 590 cfm at 5,200 RPM.  A
413 at 5,000 RPM requires 597 cfm.  All at an unlikely 100% volumetric
efficiency.  A couple of 385 cfm carbs seems and was plenty enough.  Two
500's seems like a little overkill.  I've not read or recalled how
carburetors are rated and sized now or then.  Anyone with carb rating
insights might elucidate.  Also quantify the pulse effect of tuned rams
insofar as FAC (free air capacity) is concerned.  10% more air from a 1.4
psi pulse at the intake valves?

It does not appear that undersized carbs ever limited any letter car engine.

Regards trim:  From:  http://www.allpar.com/mopar/hemi/chrysler-hemi.html

With the 300C, Chrysler again lead the way at the Daytona Speed Week.
However, the performance was off, with the fastest 300 making a one way run
of 138 miles an hour. At first the Chrysler engineers thought that the beach
surface, which varied from year to year, was the culprit. Certain that they
had a 145 mile an hour car, they took the same car to the Chelsea Proving
Grounds outside the Chrysler Headquarters. Opened up on the 5 mile track,
the 300C only made about 140 miles an hour. The driver reported a heavy wind
whistle at high speed. Finally, it was recognized that the windshield trim
for the front of the roof stuck out nearly an inch, making it a very
effective air brake. Using clay they formed the top of the windshield into a
smooth, clean shape with no edges. The same car went out and ran 146 miles
an hour with the clay covering the windshield trim.


C-300'ly
Rich Barber
Brentwood, CA
1955 Chrysler C-300
1986 Chrysler LeBaron T&C Convertible (Turbo increases the rated horsepower
by 50% over the naturally-aspirated engine with a concomitant 50% increase
in absolute manifold pressure created by the turbo and a 7 psig wastegate)

-----Original Message-----
From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On
Behalf Of Richard Osborne
Sent: Thursday, September 27, 2007 5:17 PM
To: paulholm@xxxxxxxxxxxxx
Cc: moparpjf@xxxxxxx; robkern@xxxxxxxxxxxxx; chrysler300@xxxxxxxxxxxxxxx;
Thomas Miller
Subject: Re: FOLLOWUP: 300C Hauls A** was: Re: [Chrysler300]Warningto F and
G owners

Hey Paul,

Thanks for confirming an earlier statement that "the C was a nice practice
run leading to the G".

"THEN look at the main crippling factor, the C and D are handicapped with
SMALL CARBS!!!

The F and G carbs are along the lines of 500 cfm EACH, where as the much 
better breathing hemi heads only got 385cfm each from the factory WCFB's"

I rest my case.

Richard Osborne





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