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Engine burble and popping=ok or not-so-ok?

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10musketeer

10musketeer

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My car has a fairly free-flow exhaust on it and when getting off the gas it burbles a little and if I really get going then drop off it it will pop just a little. The timing is set where it seems to like it most. So question- is burbling and a little popping bad on the valves? Is there any long term damage that is being done? Is there really any reason at all to stop it?

There it is. Go for it Gurus.
 
Never been to the races. Tis the nature of the beasts. The excess fuel when you are decelerating gets into the exhaust system (shucks it has to go somewhere) and the system heat burns it off therefore the burble, pop, and fire out the exhaust if it is short enough.

Sounds like it is working as intended to me.
 
Tis something to be ENJOYED!! /bcforum/images/%%GRAEMLIN_URL%%/grin.gif
 
Small exhaust leaks may make it worse. So check all your connections.
 
That is a very typical sound of the British siamese port engines.

Here, where they still drive a lot of cars around with these engines, it's fun to identify them just from the sound, while I'm tooling along on my bicycle.

As for that excess fuel going into the exhaust, that's why they make fuel injection. But not so much on these engines.
 
10musketeer said:
. The timing is set where it seems to like it most. .
Click to expand...

Uhhhh..... I would think thats not the way to set the timing.

Assuming you have a Spridget as you are in this classroom....if you have a later car with a gulp valve that might be also the problem.
 
But that is the way, timeing should always be where the engine runs best. The factory just identified that for you on a brand new engine. Today it will be your starting point.
 
Thanks guys. I think it's interesting it's a feature of the British engines. Can you explain what a siamese type port is?
 
jlaird said:
But that is the way timing should always be, where the engine runs best.
Click to expand...
/bcforum/images/%%GRAEMLIN_URL%%/iagree.gif
Again Jack comes with some clever words of wisdom.

The siamese port, like the famous Thai twins Chang and Eng, are connected together. The inlet valve port for adjacent cylinders are connected together to a single port at the mating of the head with the inlet manifold.
 
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