Rochester carb assistance

cheech · 04-12-2010, 08:04 PM

They do not have vacuum secondaries! They have mechanical secondaries with secondary air valves that open according to engine air flow requirements, hence the extra set of butterflys at the top of the carb.

carwash · 04-12-2010, 09:00 PM

No vacuum secondaries... they are mechanical. At least every q-jet ive had has been. if you twist that throttle linkage about halfway they start to open... mechanically.

Even if they were vacuum actuated, he would be able to open them with a screwdriver for sure. Something is seized tony, or broken inside that linkage... take it off. Worst case, trade it in for a new one for $300 or so... Or i have a guy that can rebuild it for about $50 plus parts.

Bear Chow · 04-13-2010, 10:18 AM

There are several Corvette clubs locally. And meet bi-weekly at parking lots around town. I'm sure if you bring it to one of them they could bench rebuild it right there for you.

itbrokeagain · 04-14-2010, 12:25 AM

Yea I figured it was seized up. Even if it has vaccum secondaries I should still be able to manually push them open right?

Waffle · 04-14-2010, 12:25 AM

Doubt your going to find someone getting their hands greasy and gassy at the cruise-in.

http://www.carburetor.ca/carbs/tech/...jet-index.html

Secondaries are air......The basic 750 cfm carb is used from the 231 to the 400 because of this.

04-12-2010, 09:00 PM	#2
carwash pimpin' IS easy Join Date: Jan 2007 Location: Union, KY Posts: 3,344 Images: 605	No vacuum secondaries... they are mechanical. At least every q-jet ive had has been. if you twist that throttle linkage about halfway they start to open... mechanically. Even if they were vacuum actuated, he would be able to open them with a screwdriver for sure. Something is seized tony, or broken inside that linkage... take it off. Worst case, trade it in for a new one for $300 or so... Or i have a guy that can rebuild it for about $50 plus parts. __________________

04-14-2010, 12:25 AM	#4
itbrokeagain Just Empty Every Pocket - CORE Member - Join Date: Feb 2007 Location: Amelia Posts: 1,435	Yea I figured it was seized up. Even if it has vaccum secondaries I should still be able to manually push them open right? __________________ 91 fj 80 on 37 Nitto Muds with a 10k winch. Cage and sliders coming soon.

04-12-2010, 08:04 PM	#1
cheech Join Date: May 2007 Location: cincinnati Posts: 18	They do not have vacuum secondaries! They have mechanical secondaries with secondary air valves that open according to engine air flow requirements, hence the extra set of butterflys at the top of the carb.

04-13-2010, 10:18 AM	#3
Bear Chow Jeepless Join Date: Feb 2007 Location: Oxford, Oh Posts: 302	There are several Corvette clubs locally. And meet bi-weekly at parking lots around town. I'm sure if you bring it to one of them they could bench rebuild it right there for you.

04-14-2010, 12:25 AM	#5
Waffle Join Date: Aug 2009 Location: . Posts: 75 Images: 10	Doubt your going to find someone getting their hands greasy and gassy at the cruise-in. http://www.carburetor.ca/carbs/tech/...jet-index.html Secondaries are air......The basic 750 cfm carb is used from the 231 to the 400 because of this.