Paging LARS, Carb ??

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Oct 3, 2007 | 02:38 PM

SIXFOOTER

Thread Starter

Le Mans Master

Joined: Jan 2006

Posts: 9,192

Likes: 27

From: Boca Raton Florida

Paging LARS, Carb ??

I have been llooking and looking and have not been able to determine what the difference is between a "Passenger Vehicle" and a "Truck" carb. I can see jetting differences, but what else?
Given that the basic carb is the same..

Thanks

Oct 3, 2007 | 09:26 PM

dannyman

Melting Slicks

Joined: Dec 2006

Posts: 2,669

Likes: 3

From: Kingston Ontario

ttt

Oct 4, 2007 | 10:16 AM

lars

Tech Contributor

Joined: Aug 1999

Posts: 14,373

Likes: 6,371

From: At my Bar drinking and wrenching in Lafayette Colorado

It depends on what year you're talking about. Most of the truck carbs have different booster venturies, producing a stronger fuel metering signal at low airflow velocities through the carb (lugging and pulling operations typical of a truck). Post-75 Q-Jets have completely different primary metering rods for the truck carbs (power tips are .036" diameter instead of the passenger car .026") due to this booster venturi difference. For this reason, it's difficult to set up and jet a truck carb for a high-rpm light-weight vehicle insrtead of the low-rpm heavy pulling application intended for the truck carb.
Lars

Oct 4, 2007 | 11:02 AM

Maymyvetteliveforevr

Safety Car

Joined: Mar 2005

Posts: 4,255

Likes: 82

From: Brampton Ont.

Interesting read, sorry to highjack your thread SIXFOOTER, but I was wondering the same thing about a carb# specific for auto and standard trans.

Oct 4, 2007 | 11:18 AM