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  Buying a carburator ?

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Author Topic:   Buying a carburator ?
66bluefb
Gearhead

Posts: 467
From: Okla.City,Okla.
Registered: May 2002

posted 12-25-2002 10:57 AM     Click Here to See the Profile for 66bluefb   Click Here to Email 66bluefb     Edit/Delete Message   Reply w/Quote
I am thinking about buying a holley carb. for my 302. Almost everyone says it is the best, better than my carter 625. What kind should I buy? Is a 750 too big for my set up? Could I buy a rebuilt one some place and save some cash?Thanks,Tony

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http://ourworld.cs.com/blagintony/myhomepage/auto.html
86-302 HO bored .030 over crank .010 under
B-303 cam ,harland sharp roller rockers
performer rpm intake, 625 carter
66-289 heads, ported with 160-194 valves, 3 angle valve job
4 speed toploader
pony seats

[This message has been edited by 66bluefb (edited 12-25-2002).]

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Moneymaker
Administrator

Posts: 19964
From: Lyons, IL, USA
Registered: May 99

posted 12-25-2002 12:36 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
670 cfm Avenger #0-80670 Holley should do just fine.

------------------
Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
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www.moneymakerracing.com

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Toronado3800
Gearhead

Posts: 364
From: St. Louis, MO
Registered: Jul 2001

posted 12-25-2002 05:59 PM     Click Here to See the Profile for Toronado3800     Edit/Delete Message   Reply w/Quote
I copied the below chart from the Holley Web site

I was looking for a formula I saw before which was somthing like (max rpm * 5432 / cubic inches.) but I can't find it.
******************
Vacuum Secondary Carb Chart
Vacuum secondary carbs are typically used in street applications where performance and economy are important considerations or in race applications where a car has limited traction and needs a "hit" that can be tailored to the traction available.

ENGINE SIZE MILD HOT WILD
300 390 600 650
350 600 650 750
400 650 750 750
450 750 750 850
500 750 850 950
550 850 950 950


Double Pumper Carb Chart
Double Pumper carbs are typically used in any application where maximum performance is required and economy is less important. Double pumpers have progressive mechanical secondaries and are ideal for the hard core enthusiast.

ENGINE SIZE MILD HOT WILD
300 N/A 600 650
350 600 650 750
400 650 750 800
450 750 800 850
500 750 850 950
550 850 950 1000

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Red65
Journeyman

Posts: 87
From: Northglenn, CO, USA
Registered: Jul 2002

posted 12-25-2002 08:22 PM     Click Here to See the Profile for Red65   Click Here to Email Red65     Edit/Delete Message   Reply w/Quote
I think you're looking for this formula:

RPM X Displacement / 3456 * VE

VE = Volumetric Efficiency (use .85 for a good street engine)

Source: Martin, Isaac. FORD WINDSOR SMALL BLOCK PERFORMANCE, HP Books: New York, 1999. page 78.

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Pierre
Gearhead

Posts: 394
From: Near Paris, France
Registered: Apr 2002

posted 12-26-2002 10:06 AM     Click Here to See the Profile for Pierre   Click Here to Email Pierre     Edit/Delete Message   Reply w/Quote
I looked extensively into this situation with a 302 middly built-up. Holley made a HUGE difference over my previous Edelbrock 600 in regard to throttle response, mpg was similar when driving nice.

After extensive testing between the 750 vac sec and 600 Double pumper, I got the same power out of both (that I could "feel" or time) the 750 cured a lean condition but increased mpg drastically so I went back and finally settled for a new 600 DP sligtly richer than stock.
I am just an average guy with limited mechanical knowledge, and this is just my 2 euros

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Red65
Journeyman

Posts: 87
From: Northglenn, CO, USA
Registered: Jul 2002

posted 12-26-2002 11:06 AM     Click Here to See the Profile for Red65   Click Here to Email Red65     Edit/Delete Message   Reply w/Quote
Pierre,

Saw this Boss 302 in Paris last year, about a about 1000 meters from the Arc de Triomphe.

Just thought you might find it interesting, I sure did!!

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Red65
Journeyman

Posts: 87
From: Northglenn, CO, USA
Registered: Jul 2002

posted 12-26-2002 11:11 AM     Click Here to See the Profile for Red65   Click Here to Email Red65     Edit/Delete Message   Reply w/Quote

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Pierre
Gearhead

Posts: 394
From: Near Paris, France
Registered: Apr 2002

posted 12-26-2002 01:08 PM     Click Here to See the Profile for Pierre   Click Here to Email Pierre     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Red65:
Pierre,

Saw this Boss 302 in Paris last year, about a about 1000 meters from the Arc de Triomphe.

Just thought you might find it interesting, I sure did!!

[IMG]
http://us.f1.yahoofs.com/users/51894e89/bc/Yahoo!+Photo+Album/Image-03.jpg?bcukyC.Ariql8G6H[/IMG]


I am not seing the picture. Not sure if it is my computer !! Email it to me please

There are an estimated 4000 mustangs that where sold here, 1500 still running, some very irregularly.
Concidering all of the taxes & duties & maintenance costs, these cars were (back then) fairly expensive by the time they got here so only the well-off people were able to afford them. So most of them are loaded with options and there are some pretty rare models.
Switzerland is a real Gold mine for all kinds of Shelby and rare stuff.

I would be interested to see that Boss though

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Red65
Journeyman

Posts: 87
From: Northglenn, CO, USA
Registered: Jul 2002

posted 12-26-2002 01:47 PM     Click Here to See the Profile for Red65   Click Here to Email Red65     Edit/Delete Message   Reply w/Quote
Pierre,

You've got mail!!

By the way, it was more like 300 meters, not 1000 meters (1 km).

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Jeff
Gearhead

Posts: 280
From: Moore, OK USA
Registered: Mar 2001

posted 12-26-2002 02:25 PM     Click Here to See the Profile for Jeff   Click Here to Email Jeff     Edit/Delete Message   Reply w/Quote
The formula for your 302 quickly reduces to:

cfm=1/10 rpm

Thus for 6000 rpm, cfm = 600 cfm
for 7000 rpm, cfm = 700 cfm
for 8000 rpm, cfm = 800 cfm

Look at your intake specification. If the power bandwidth for the intake is 1500-6500 rpm, then using 6500 rpm as the upper bandwidth rpm then:

for 6500 rpm, cfm = 650 cfm.

I think the safe bet for you is the Holley 670 street avenger previously mentioned. This carb must be sitting on a Edelbrock Performer or Weiand Stealth manifold to reach its potential. If you want more low end torque and smoother throttle response go with the 570 cfm street avenger. If you're not sold on Holley carbs, use the same cfm range in an Edelbrock or Carter.

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Toronado3800
Gearhead

Posts: 364
From: St. Louis, MO
Registered: Jul 2001

posted 12-26-2002 05:25 PM     Click Here to See the Profile for Toronado3800     Edit/Delete Message   Reply w/Quote
Thanks for the formula RED! That is what I was looking for.

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