Re: 4 BBL Carburator for new Poly Intake

["Steve Mick" <micher@xxxxxxxxxxxxxxx>]

On my mild 440 build, The formula that covered my particular componets 
showed that a 650 CFM COULD be used . It was on the upper limit and so I 
decided to go with a 750CFM. That way if I made any more modifications, I 
would already have the bigger carb. A bigger carb can be 
de-tuned........................................MO

{Steve Mick}
http://stevemick1964dodge.shutterfly.com/pictures/5
----- Original Message ----- 
From: "Gary H." <62to65mopar@xxxxxxxxxxx>
To: <1962to1965mopars@xxxxxxxxxxxxxxxx>
Sent: Monday, January 13, 2014 9:31 PM
Subject: Re: 4 BBL Carburator for new Poly Intake


Heh, heh, well I feel like the Google translator that is trying to translate 
Don's experience -- and probably doing a similar quality job. LOL I wish Don 
was still a member here so he could 2c it out!

Your argument I buy, and the math seems to follow along.

Here is what Don wrote about his practical carb size formula:

"... the question comes up in one’s mind that carb sizing is for racing of 
full performance. What if one just wants carb for an engine that will never 
see 6000 RPM. Should you use a different formula?
Actually it is not necessary. Because carb sizing is focused on the whole 
rpm range and proper carb operation at low speed. That is because any engine 
will operate a carb at high speed. That is never a problem, even a 1050 
Dominator on a VVW flat four would be possible at 2500 RPM. It is the low 
speed performance that we are always concerned about and the carb sizing 
formulas, mine or the complicated math version, are picking the largest size 
of carb practical that will still drive normally and properly at normal low 
speed so you can use the same formula even if you intend to drive like yer 
Granny...."

Thanks,
Gary H.

>  -------Original Message-------

>  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

--
--
--
Please address private email -- email of interest to only one person --  
directly to that person. That is, email your parts/car transactions and 
negotiations, as well as other personal messages, only to the intended 
recipient. Do not just press "reply" and send your email to everyone using 
the general '62-'65 Clubhouse public email 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.
--
You received this message because you are subscribed to the Google Groups 
"The 1962 to 1965 Mopar Mail List Clubhouse" group.
http://groups.google.com/group/1962to1965mopars?hl=en.

--- 
You received this message because you are subscribed to the Google Groups 
"The 1962 to 1965 Mopar Mail List Clubhouse" group.
To unsubscribe from this group and stop receiving emails from it, send an 
email to 1962to1965mopars+unsubscribe@xxxxxxxxxxxxxxxxx
For more options, visit https://groups.google.com/groups/opt_out. 

--
--
--
Please address private email -- email of interest to only one person -- directly to that person. That is, email your parts/car transactions and negotiations, as well as other personal messages, only to the intended recipient. Do not just press "reply" and send your email to everyone using the general '62-'65 Clubhouse public email 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.
--
You received this message because you are subscribed to the Google Groups "The 1962 to 1965 Mopar Mail List Clubhouse" group.
http://groups.google.com/group/1962to1965mopars?hl=en.

--- 
You received this message because you are subscribed to the Google Groups "The 1962 to 1965 Mopar Mail List Clubhouse" group.
To unsubscribe from this group and stop receiving emails from it, send an email to 1962to1965mopars+unsubscribe@xxxxxxxxxxxxxxxxx
For more options, visit https://groups.google.com/groups/opt_out.