<VV> backfiring

[Secular]

  I experienced the same problem with my 66 110 (4spd). I finally checked the timing, it was way off (instead of 14 degrees it was set on 6!) - anyway, the main reason a car backfires is because a valve is not closed when the spark plug fires. If it is an intake valve, it will backfire through the intake. If it is an exhaust valve, it will backfire through the tailpipe.
  There can be several reasons for this. The valves are adjusted too tight. Valve stems can be slightly bent and not allowing free movement up and down. Or as I mentioned, the ignition timing could be the culprit. 

  Tony

 

----- Original Message ----- 
From: "Paul Abel" <pbob63 at frontiernet.net>
To: <virtualvairs at corvair.org>
Sent: Tuesday, August 29, 2006 5:35 PM
Subject: <VV> backfiring


> Finally got the 65 monza sedan 110pg on the road. I've put about 200 
> miles on it, and the valve train seems to have settled in fine (sat 
> 15yrs) It starts right up, and idles good, no lifter noise. Up to about 
> 40 mph it runs pretty well. Problem is, when I get on the highway and 
> get it up to speed, it bucks and backfires, hard to keep a constant 
> speed. I've been told the carbs need adjusting. I tried setting them 
> according to the manual, but I'm having trouble getting them perfectly 
> balanced. Is this really my problem? I've had misadjusted carbs before, 
> but never had the bucking / backfiring thing happen. Could I have a bad 
> condenser? Gas tank was cleaned, lines replaced, new fuel pump, inline 
> filter.
> 
> Paul Abel.
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