4180
4180
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 40
From: EXTREME southwest CT
The 4180 on 460's was rated @ 600 cfm,
I believe the 4180's in the 5.0 mustangs were 580 or so.
There's even a 675 model.
Check the #'s, I think there's a sticky on the fuel delivery board.
I believe the 4180's in the 5.0 mustangs were 580 or so.
There's even a 675 model.
Check the #'s, I think there's a sticky on the fuel delivery board.
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
Engine size can effect the flow capacity of a carb. Example, back in the early 60's the 406 and the 390 both had the exact same 3X2 barrel setup. The 406 was rated at 920 CFM while the 390 was rated at 860 CFM. This is the auto manufactures only. The rated CFM of a carb from most carb manufactures is 4 barrels are rated at 1.5" hg (vacuum) and 2 barrels are rated at 3"hg.
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 40
From: EXTREME southwest CT
Originally Posted by Bear 45/70
The rated CFM of a carb from most carb manufactures is 4 barrels are rated at 1.5" hg (vacuum) and 2 barrels are rated at 3"hg.
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
Originally Posted by ArdWrknTrk
I had no idea that a 2 barrel would be measured at twice the vacuum
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pedant
Joined: Jan 2008
Posts: 23,576
Likes: 40
From: EXTREME southwest CT
I'm familiar with fluid dynamics and can find the answer. The formula's in Vizards book.
But why..3 inches of mercury v/s 1.5?
But why..3 inches of mercury v/s 1.5?
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Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
With the same engine CID at the same WOT rpm the the 2V engine will have a higher vacuum than a 4V will because of the smaller cross sectional area of the throttle bores and the venturi areas and that's the reason as told to me many years ago by a Holley tech guy at a Nationals drag race in Tulsa.
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 40
From: EXTREME southwest CT
Thanks Bear,
This makes some sense, but logically one would size the carb to displacement, and rpm range unless restricted by race rules.
Guess I'm too ignorant to think this way, and had figured manufacturers would compare 'apples to apples.'
Sorry to hijack......
This makes some sense, but logically one would size the carb to displacement, and rpm range unless restricted by race rules.
Guess I'm too ignorant to think this way, and had figured manufacturers would compare 'apples to apples.'
Sorry to hijack......
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