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CFM formula?
#1
I'm going to be doing some carb shopping soon, and was wondering what size to get? I believe the one I have is a 600 cfm, so I'll probably go with that again as it has worked in the past...but I was wondering if I should reevaluate the size? Its going to sit on my 351C which is bored 30 over, has a mild cam and intake, and headers if that makes a difference. Thoughts?

Jason

1973 Mach1 Q-code




My carbon footprint is exceptionally large.
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#2
2v or 4v heads? What intake? Mild cam (do you have the specs on it?) Headers?

'73 Grandé H Code. Headman long tube headers, T-5 Transmission, 3.70 Traclok, Lowered 1" all around, Aussie 2v heads w/ 2.19 intake, 1.71 exhaust, screw in studs, full roller cam 608/612 lift 280/281 duration LSA 112, Quick Fuel 750 CFM double pumper, AirGap intake.

'73 F code convertible. Bright red. Needs total restore. (IE HOT MESS)

- Jason
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#3
(03-07-2017, 08:47 AM)4v, and yes it does have headers. It\s an Edelbrock intake, not sure which one...it was on the car when I bought it. Same with the cam, not sure the specs. Wrote: 2v or 4v heads? What intake? Mild cam (do you have the specs on it?) Headers?

Jason

1973 Mach1 Q-code




My carbon footprint is exceptionally large.
  Reply
#4
On the 351c page a lot of the guys swear the 4v needs at least a 750. I ran a 670 on my 2v and it was a really good carb. These engines seem to breath deeply.

1971 Mustang Grandé, 351 Cleveland 2v, C6, 9"
-Fitech EFI
-Comp Cams 284hr
-Aussie Heads
-Weiand Xcelerator intake
-Long Tube Headers
-Boss Hogg "Street Bandit"


My Build
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#5
One of the outputs in these spreadsheets is carburetor cfm.

https://www.7173mustangs.com/thread-engi...lculations

https://www.7173mustangs.com/thread-camshaft-selection

They enable you to play around with the variables to see how and what changes.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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#6
does your old one work and are you selling it. lol..

Karla
1972 Mustang Fastback
3 boys and a hubby
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#7
(03-07-2017, 12:45 PM)Thanks, the cam selector one has cfm info on it. Pretty sweet, did you make these? Don C Wrote: One of the outputs in these spreadsheets is carburetor cfm.

https://www.7173mustangs.com/thread-engi...lculations

https://www.7173mustangs.com/thread-camshaft-selection

They enable you to play around with the variables to see how and what changes.

Jason

1973 Mach1 Q-code




My carbon footprint is exceptionally large.
  Reply
#8
Yes, the engine calculation was relatively easy, just needed to use standard formulae for the outputs and cfm. The cam selection one took a lot more thought.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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