How does fuel "get around" the cylinders?

How does fuel "get around" the cylinders?

Postby Lumpy [OP] » February 19th 2015, 1:09am

In any engine with more than one cylinder and less than one carb/injector per cylinder, what happens to the fuel/air mix in the cylinders that AREN'T firing?

eg my TBI throws fuel into all six cylinders at once, 3L and 3R. But only one cylinder, of course, is firing at a time. When #1 is firing, what's happening to the fuel mix in the tubes leading to #2 - #6? Does it stay atomized and get sucked into the appropriate cylinders when THEIR valves open?


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Re: How does fuel "get around" the cylinders?

Postby chevymaher » February 19th 2015, 1:19am

Yes it just stays atomized in the intake tracts. At cruising speed 2000 RPM the intake on each cylinder is opening 2.7 times a second. It creates a pulse but for all intents and purposes it is pretty much a steady flow on all cylinders.
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Re: How does fuel "get around" the cylinders?

Postby paulo57509 » February 19th 2015, 5:53am

When I was helping out in my father's shop after school back in the day, I was surprised to discover how turbulent air flow in an engine can be.

One customer had brought in an old Ford F-450 that had a 330cid V8 with a dead cylinder. After determining that it was a burnt valve (or so I thought), I pulled of the offending head and found that one of the hardened exhaust valve seats had fractured and broke away from the cylinder head. A few pieces of it were still in that cylinder.

When I pulled the other head, I found a few more pieces of the seat in a couple of other cylinders.
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