popping back fire

G

grf

Junior Member
1951 ford 8ba with dual 94 carbs
12 volt gen internal ballast coil
stock distributor
idles fine but when you steadily bring up the rpm it starts to back fire and pop thru the carburetor
any ideas

thanks Gerry
 
grf said:
1951 ford 8ba with dual 94 carbs
12 volt gen internal ballast coil
stock distributor
idles fine but when you steadily bring up the rpm it starts to back fire and pop thru the carburetor
any ideas

thanks Gerry
Click to expand...
You just defined the problem. The stock single carb/Loadamatic distributor combination is a specialized pairing. If you change the carburetion, you should change to a distributor with regular mechanical advance, like an old dual point Mallory or a converted GM unit.
 
Two post on same topic. As tubman posted, sounds like the distributor is not functioning correctly. How is the vacuum line connected?
 
the vacuum to distributor is from the carb closest to the firewall
the second carb vacuum is blocked off
if I remove and crimp the vac line from dist and advance or retard there is not much rpm variance
 
Might be a lean condition. Maybe a stuck valve.


Just an opinion, a single carb and factory "great working" vacuum distributor, works well. As I've been told.


Dual, I'd think about a conversion. Link posted above. Your 12v already, lots of options.






.
 
Last edited:
grf said:
the vacuum to distributor is from the carb closest to the firewall
the second carb vacuum is blocked off
if I remove and crimp the vac line from dist and advance or retard there is not much rpm variance
Click to expand...

That's because there is very little flow through the venturi, so no signal.
 
Personally I like mechanical with points. No electronics to go bad. No doubt a electronic system will give you great high end performance. Mechanical will get you down the road for decades. Just a thought.
 
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