Re: 4 BBL Carburator for new Poly Intake

[JimJablonski <groovinjim@xxxxxxx>]

Gary, I'l defer to you, but let's explore this a bit further just for discussion purposes.

Don acknowledged his math (CID x 2) was a cheater method given it wouold always end up close anyways to the specific formula of RPM / 2 x CID/1728.  However, I interpreted his cheater method in the context of his race motor builds.  Here's how I came to this conclusion - and let's use the Poly 4 barrel as an example:

DD rule of thumb: 318 x2 = 636 CFM

Specific formula, using 7000 RPM as a rev limit for a race engine: 7000 / 2 <3500> x 318/1728 <0.184> = 644 CFM

=> DD method and formula close enough to not be concerned, right?

Now ... let's apply the formula to a cruiser, and just for discussion say the shift points are 4500 RPM.  Now we have 4500 / 2 <2250> x 318/1728 <0.184> = 414 CFM.

My thinking is the RPM is the variable, and really the telltale on a) what kind of driving you will be doing, so b) you can find the sweetspot CFM.

Fun stuff...

Jim

 

On Monday, January 13, 2014 9:30:16 PM UTC-5, 62to65mopar wrote:

Don wrote that his carb size formula would work for street AND race applications.

Thanks,
Gary H.

>  -------Original Message-------
>  From: Jim Jablonski
 
>  
>  The DD CFM rule of thumb is a loose interpretation of RPM / 2 x CID/1728,
>  and applicable to racing.

[LINK: http://overview.mail.yahoo.com?.src="">]
>  
>  Sent from Yahoo Mail for iPhone

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