Re: [Healeys] exhaust popping

[Bob Spidell <bspidell@comcast.net>]

Similar to what happens when doing a 'mag check' in a light piston airplane.  
In switching from one magneto to another, 
sometimes you accidentally turn both off, and a loud backfire often occurs.  If 
it's bad enough an engine shutdown and 
inspection of the exhaust system is in order.

On another note, didn't some other British cars--old MGs maybe--have an 
'overrun' valve to prevent such 
backfiring/popping?  I presume the idea is to have the high vacuum open an 
alternate air source to dilute the mixture.

Bob


On 10/11/2014 2:17 PM, Ron Fine wrote:
> When I was 17 years old and in the army, training at Fort Ord, CA as a truck 
> driver, someone showed me how to make a 
> lot of noise.  Driving a big truck downhill, coasting, just flip the ignition 
> switch off and on again.  I blew apart a 
> muffler once with that trick.  It was hard explaining what happened to my 
> sergeant.
>
> Ron
>
>
>
>


-- 
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Bob Spidell           San Jose, CA            bspidell@comcast.net

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