cars street vs off road

B

bobtail

Sr. Member

Joined

Apr 3, 2013

Messages

365

Loc.

high in the desert

• May 21, 2018

• #1

what makes a off road carb different from a street carb? I understand that a off road carb won't flood or starve during steep hill climbs and ;Dunclimbs;D. is it the float ?

 

blubuckaroo

Grease Monkey

Joined

Jun 11, 2007

Messages

11,795

Loc.

Ridgefield WA

• May 21, 2018

• #2

Mostly, It's the venting that makes it an off road carb. There is usually plumbing that extends the bowl vent up, so it doesn't slosh fuel from the bowl into the venturi durring bumps and unlevel driving.

Also, on an Edelbrock, carb, there are "off road" needle valves available. They have springs in them that keep the bouncing floats from dumping in too much fuel on washboard roads. But they really don't help at all on unlevel driving.

 

FordBronc

Contributor

Bronco's, yea I have a couple.

Joined

Dec 26, 2010

Messages

1,429

Loc.

Polk County, Missouri

• May 21, 2018

• #3

Spring loaded need seats..https://www.4wheelparts.com/Perform...65.aspx?t_c=74&t_s=550&t_pt=3125&t_pn=EDE1465

http://www.offroadxtreme.com/engine...edelbrock-carb-work-better-road-applications/

Holley http://www.fourwheeler.com/how-to/engine/154-0904-making-an-offroad-carburetor/

In house advice. https://classicbroncos.com/tech/offroad-tricks-for-holley-4-barrel-carbs

IMO do not buy into all that "off road" carb talk and waste your $. Edelbrock with all the tricks will still flood out going down steep hills. Q-jet has a better off road rep.

Best thing I found to work is a Motorcraft 2100 2 bbl, TBI, EFI or propane.

 

Rustytruck

Bronco Guru

Joined

Feb 24, 2002

Messages

10,875

• May 21, 2018

• #4

The Motorcraft 2100/2150 for offroad trucks Ford added a spring to the float shaft to counter balance the float.

https://quadrajetparts.com/float-spring-2100-2150-4100-carburetors-p-1341.html

For real offroad duty beyond a forest road a Quadrajet is hard to beat, after that start looking for fuel injection.

 

Q

Quick & Dirty

Sr. Member

Joined

Feb 15, 2004

Messages

828

• May 21, 2018

• #5

In addition to the float spring, the Bronco 2100/2150 has the bowl vents below the choke horn. Most have the vents extending above.