carb and fuel pump advice

tireshredder · April 17th, 2011, 10:47 PM

hello everyone
what sze carb does eveyone think i should put on 347

Blown284 · April 17th, 2011, 10:49 PM

What other mods are done to the car? My first guess would be 650 double pumper, mech secondaries, and a Holley Blue Elec. Pump. That's what I had on my old car and it ran great

tireshredder · April 17th, 2011, 11:01 PM

disk brakes,9inch and going to install t5 while doing engine swap

Countryboy_99 · April 17th, 2011, 11:14 PM

I think he meant that as in more of a what's been done to the engine sort of way. What heads, cam, and that sort of thing y'know.

By the way welcome to the forums.

tireshredder · April 17th, 2011, 11:33 PM

eagle crank and rods
srp forged pistons
comp valve train # 31-250-4 grind #fsxe284h-10
roush world heads
vic jr intake
msd dis
true roller

Countryboy_99 · April 18th, 2011, 12:04 AM

Ok, now what are the specs on the heads (flow rates and etc.) and the cam (duration, lift, etc.)? I'm going to say AT LEAST a 650 cfm carb. You may want a little more though depending on the specs of the parts you listed.

Blown284 · April 18th, 2011, 03:20 AM

Agree with countryboy... What kind of compression are you going to be working with?

69fastback · April 18th, 2011, 08:39 AM

How many RPMs is it going to spin? Is that part # the XE284H cam?

The volumetric efficiency formula is

CFM= CID X RPM / 3456

tireshredder · April 18th, 2011, 09:32 PM

Roush Cylinder Heads for Ford - FordMuscle

tireshredder · April 18th, 2011, 10:27 PM

i am thinking 750 holley double pumper and holley red electric

69fastback · April 18th, 2011, 11:09 PM

That's too much

If that is an XE284H cam, it will make peak power before it gets to 6000 RPMs. Even at 6000 it goes....

347X6000 = 2,082,000

2,082,000 / 3456 = 602.4 CFM

Considering most OTB carburetors don't flow the advertised numbers, I'd say a 650 mechanical secondaries would be perfect.

Countryboy_99 · April 19th, 2011, 12:58 AM

I thought that was a bigger, higher winding cam than it actually is. I never looked up the specs for it but for some reason I assumed it was.

So my bad on suggesting possibly going bigger than a 650.

April 17th, 2011, 10:47 PM	#1
tireshredder Newbie 70 coupe getting faster Join Date: Mar 2011 Location: peshtigo wi Posts: 19 iTrader: 0 reviews	carb and fuel pump advice hello everyone what sze carb does eveyone think i should put on 347

April 17th, 2011, 10:49 PM	#2
Blown284 MM Fanatic 1966 Mustang Coupe Won't See The Track Join Date: Apr 2010 Location: The Devil's Porch Posts: 3,370 iTrader: 0 reviews	What other mods are done to the car? My first guess would be 650 double pumper, mech secondaries, and a Holley Blue Elec. Pump. That's what I had on my old car and it ran great __________________ Previous Rides 1997 Blown Cobra-Sold & Missed 2004 Lightning-Traded 2001 Turbo GT-Traded 1966 Mustang Coupe-Sold 2006 Audi A3-sold 1998 Bagged Silverado- Sold 1997 BMW AC Schnitzer 540i S5

April 17th, 2011, 11:14 PM	#4
Countryboy_99 Enthusiast '95 GT Was probably faster before I got it. Join Date: Feb 2007 Location: Wichita, Kansas Posts: 861 iTrader: 0 reviews	I think he meant that as in more of a what's been done to the engine sort of way. What heads, cam, and that sort of thing y'know. By the way welcome to the forums. __________________ Its red, long, and comes with an 8 foot bed attached. Wanna come play with it?

April 18th, 2011, 12:04 AM	#6
Countryboy_99 Enthusiast '95 GT Was probably faster before I got it. Join Date: Feb 2007 Location: Wichita, Kansas Posts: 861 iTrader: 0 reviews	Ok, now what are the specs on the heads (flow rates and etc.) and the cam (duration, lift, etc.)? I'm going to say AT LEAST a 650 cfm carb. You may want a little more though depending on the specs of the parts you listed. __________________ Its red, long, and comes with an 8 foot bed attached. Wanna come play with it?

April 18th, 2011, 03:20 AM	#7
Blown284 MM Fanatic 1966 Mustang Coupe Won't See The Track Join Date: Apr 2010 Location: The Devil's Porch Posts: 3,370 iTrader: 0 reviews	Agree with countryboy... What kind of compression are you going to be working with? __________________ Previous Rides 1997 Blown Cobra-Sold & Missed 2004 Lightning-Traded 2001 Turbo GT-Traded 1966 Mustang Coupe-Sold 2006 Audi A3-sold 1998 Bagged Silverado- Sold 1997 BMW AC Schnitzer 540i S5

April 17th, 2011, 11:01 PM	#3
tireshredder Newbie 70 coupe getting faster Join Date: Mar 2011 Location: peshtigo wi Posts: 19 iTrader: 0 reviews	disk brakes,9inch and going to install t5 while doing engine swap

April 17th, 2011, 11:33 PM	#5
tireshredder Newbie 70 coupe getting faster Join Date: Mar 2011 Location: peshtigo wi Posts: 19 iTrader: 0 reviews	eagle crank and rods srp forged pistons comp valve train # 31-250-4 grind #fsxe284h-10 roush world heads vic jr intake msd dis true roller

April 18th, 2011, 08:39 AM	#8
69fastback Premium Member 1969 Mustang Mach 1 6.824@101.61 Join Date: Aug 2006 Location: Oklahoma jackass, get to driving Posts: 5,572 iTrader: 0 reviews	How many RPMs is it going to spin? Is that part # the XE284H cam? The volumetric efficiency formula is CFM= CID X RPM / 3456 __________________ ./___ _ ____ ___ \. ( ]]] _ _ O _ _ [[[ ) \_ o _ _____ _ o _/ \|___\| ......... \|___\| http://www.youtube.com/watch?v=HyYU3...e_gdata_player

April 18th, 2011, 09:32 PM	#9
tireshredder Newbie 70 coupe getting faster Join Date: Mar 2011 Location: peshtigo wi Posts: 19 iTrader: 0 reviews	Roush Cylinder Heads for Ford - FordMuscle

April 18th, 2011, 10:27 PM	#10
tireshredder Newbie 70 coupe getting faster Join Date: Mar 2011 Location: peshtigo wi Posts: 19 iTrader: 0 reviews	i am thinking 750 holley double pumper and holley red electric

April 18th, 2011, 11:09 PM	#11
69fastback Premium Member 1969 Mustang Mach 1 6.824@101.61 Join Date: Aug 2006 Location: Oklahoma jackass, get to driving Posts: 5,572 iTrader: 0 reviews	That's too much If that is an XE284H cam, it will make peak power before it gets to 6000 RPMs. Even at 6000 it goes.... 347X6000 = 2,082,000 2,082,000 / 3456 = 602.4 CFM Considering most OTB carburetors don't flow the advertised numbers, I'd say a 650 mechanical secondaries would be perfect. __________________ ./___ _ ____ ___ \. ( ]]] _ _ O _ _ [[[ ) \_ o _ _____ _ o _/ \|___\| ......... \|___\| http://www.youtube.com/watch?v=HyYU3...e_gdata_player

April 19th, 2011, 12:58 AM	#12
Countryboy_99 Enthusiast '95 GT Was probably faster before I got it. Join Date: Feb 2007 Location: Wichita, Kansas Posts: 861 iTrader: 0 reviews	I thought that was a bigger, higher winding cam than it actually is. I never looked up the specs for it but for some reason I assumed it was. So my bad on suggesting possibly going bigger than a 650. __________________ Its red, long, and comes with an 8 foot bed attached. Wanna come play with it?

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