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EFV-8 Club Forum / Light Commercial Truck Discussion / Carb Spacer

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Posted By Discussion Topic: Carb Spacer

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supereal
05-14-2013 @ 7:23 AM
Senior
Posts: 6819
Joined: Oct 2009
          
Old coils fail as ambient heat increases due to the increase in resistance of the windings. Old coils were insulated with a kind of waxed paper that disintegrates over time. This often allows shorts between windings which further decreases coil output. It is safe to say 99.9 percent of old coils are subject to this problem. We have a box full of old coils that are weak. When used, the usually start quickly, then cause missing, then loss of power, followed by stalling. Professional rebuilders, such as Skip Haney, rewind the coils using modern insulation. This problem gave rise to the "vapor lock" diagnosis many years ago. A weak spark will not fire fuel, hot or cold. Cooling the carb treats the symptom, not the cause. I drive my cars in temps over 100 without problems, even with the "new" gas.

lazy69ranch
05-13-2013 @ 6:38 PM
Member
Posts: 50
Joined: May 2012
          
Good question, Richard. I probably should have asked that very question first. I was in the process of rebuilding my carb and had seen ads for carb spacers claiming to be a preventive measure. So it was more of an opportunity to upgrade while the carb was off. Sounds like it is not necessary if everything else is functioning properly. Am I to understand that a poor coil creates heat through increased resistance?

Dan

alanwoodieman
05-12-2013 @ 7:18 PM
Senior
Posts: 868
Joined: Oct 2009
          
the problems we in the south have had is the gas in the carb is actually boiling if the heat riser is not blocked when installing the intake. This problem is real bad if you are attempting to run the car in a parade or thru traffic-not much gas is coming to the carb to cool the gas. I have installed spacers on two engines thus far with good results-both of these engines have good spark during this extended heat period. So if the spark is good then it may help your problem-not all problems are cured by a new coil.

51f1
05-12-2013 @ 10:38 AM
Senior
Posts: 573
Joined: Oct 2009
          
I agree that vapor-lock problems are probably a bad coil that fails when hot.

And why do you want to keep the carb cooler?

Richard

lazy69ranch
05-11-2013 @ 4:39 PM
Member
Posts: 50
Joined: May 2012
          
Thanks for taking time to put a sanity check on this for me, fellas. No substitute for sage experience....Dan

TomO
05-10-2013 @ 9:13 AM
Senior
Posts: 7250
Joined: Oct 2009
          
The only thing that the carb spacers fix is your wallet. If your carburetor is rebuilt properly, the normal engine heat will not affect the performance or starting ability of the car.

Tom

supereal
05-09-2013 @ 8:30 PM
Senior
Posts: 6819
Joined: Oct 2009
          
I agree with Tom. Carb "spacers" tend to be a solution in search of a problem. If you want to reduce carb heat, block off the ports for the exhaust under the center of the intake manifold if you don't live in a cold climate. If you have problems, check for exhaust restrictors, either the kind with the spring and lever, or the internal "duck bill" type that are contained on the muffler side of the cross over pipe. They are often stuck.

trjford8
05-09-2013 @ 7:51 PM
Senior
Posts: 4214
Joined: Oct 2009
          
I'm not sure you can find a spacer for that carb. I also doubt that it will have much effect on how your truck runs. Things that act like "vapor lock" generally are caused by a weak coil and not heat. Keep your cooling system clean and the motor tuned up and you should not have to worry about too much heat getting to the carb.

lazy69ranch
05-09-2013 @ 6:25 PM
Member
Posts: 50
Joined: May 2012
          
Anyone out there have experience with carb spacers under a 94 carb on an 8RT engine or other applications? I've read about the potential to keep the carb cooler and wondering if they're worth installing and if there are preferred brands or materials. This is probably a 101 question, I appreciate benefiting from your experience.

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