RE: [Chrysler300] 'short' long rams

[<john_nowosacki@xxxxxxxxxxx>]

I've read the article and I understand the theory about the length of the acoustical tubes, etc.  It is very much like the theory behind loudspeaker enclosure design of transmission line and bass reflex loudspeakers, which I am very familiar with.  What I am looking for is practical experience with changing just the tubes without changing carbs and exhaust.  If I make the change, I know the overall torque should go down, the horsepower should go up, and it should all shift upwards in rpm from where it is now, but will it really be effective with the same carbs and cam, or are larger cfm carbs required?  Is a higher lift cam with more overlap necessary?  

If you change the resonance point to a higher frequency, you might need more air and fuel to keep up with the higher velocity of air and fuel, so the 2903S's might not be able to keep up, and the valves might need to stay open slightly longer, meaning a different cam.

I'd like to hear from someone with practical experience, or maybe someone who can tell me if the J/K cam is different than an F/G cam, or if the carbs are higher CFM on a J/K before I buy a set of these rams and potentially spend money for little or no performance boost.

 

John Nowosacki

978-681-2219

 

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________________________________

From: BARJAM300@xxxxxxx [mailto:BARJAM300@xxxxxxx] 
Sent: Monday, March 23, 2009 9:58 PM
To: NOWOSACKI,JOHN (A-USA,ex1); chrysler300@xxxxxxxxxxxxxxx
Subject: Re: [Chrysler300] 'short' long rams

 

John and Club members,

 

If you want to answer you own questions and learn much more about the application resonance frequency to pack piston cylinders read the article written by Al Kirschenbaum published in the September 1999 issue of Mopar Muscle magazine.

 

300'ly,

Jim Bartuska

Niles, Mich 

 

In a message dated 3/23/2009 7:22:00 A.M. Eastern Daylight Time, john_nowosacki@xxxxxxxxxxx writes:

	Does anyone have the casting numbers for the 'short' long rams? Were they different for 62/63/64 cars? I think they were used in 62 on the 405 HP optioned cars, but in 63 and 64 on the J and K they were rated at 390HP? Are all three the same? Why 15 more HP in 62?
	
	Were they only made for use with the large headers, or could they be used with the 'standard' ram exhaust manifolds? What would happen if a set were put on a G without changing carbs, cam, headers, etc.
	
	Thanks,
	
	John 
	
	[Non-text portions of this message have been removed]

	

 

________________________________

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