Buck is correct. For now obscure reason establish a million years ago by
the SAE, the flow rate through a 2BBL carburetor is measured at 3.0
in./Hg. pressure drop and the 4BBL carbs are measured at 1.5 in./Hg.
pressure drop. So, a 500 CFM 2BBL compares to a 350 CFM 4BBL in flow. A
quick approximation is to take the rated CFM of a 2BBL and divide by the
square root of 2 (1.41421) to get the equivalent rating if it was a
4BBL.
Bugz
-----Original Message-----
From: Greg Koss
Sent: Tuesday, June 22, 2010 1:00 PM
To: tigers@autox.team.net
Subject: Re: [Tigers] Best Carburetor
Buck, I guess I'll have to the "Doubting Thomas" on this one. Do you
have reference material for this comment?
>>> "Buck Trippel" <BuckTrippel@Verizon.net> 6/22/2010 11:40 AM >>>
It's probably a good time to remember that the CFM ratings on two
barrels are measured using different criteria than used for quads.
A 500 CFM two barrel does not flow as much as a 500 CFM 4-barrel. The
500 CFM two barrel would flow about the same as a 360 CFM four barrel.
Buck Trippel
----- Original Message -----
From: "Howard gentry" <zymmer4@yahoo.com>
To: "Tod Brown" <todbrown@roadrunner.com>; <tigers@autox.team.net>
Sent: Tuesday, June 22, 2010 6:51 AM
Subject: Re: [Tigers] Best Carburetor
> Hi,
> I ran a 500CFM on my hy-po 289 in Colorado@5200 ft. elevation..It
> worked like a finely mapped fuel injection system..Instant throttle
> response, great
> milage(20) and just was a treat.
> zym
>
> The Blues is the only music Original to the United States of America.
>
> --- On Mon, 6/21/10, Tod Brown <todbrown@roadrunner.com> wrote:
>
>
> From: Tod Brown <todbrown@roadrunner.com>
> Subject: Re: [Tigers] Best Carburetor
> To: tigers@autox.team.net
> Date: Monday, June 21, 2010, 9:54 PM
>
>
> It's a long story, but I have been running a Holley 1850 on my tweaked
> 260 and have been thinking of changing it since the prevailing opinion
> is that it is too much carb for the 260. One of the other carbs I
> have seen that seems like it might work is the Edelbrock 1403/1404
> which is rated at 500 cfm. Anybody have any experience or thoughts on
this?
>
> Tod
> B3820022384LRXFE
> _______________________________________________
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