how many rotations of crankshaft does it take to fire all cylinders of v8 engine black_13
- posted
14 years ago
how many rotations of crankshaft does it take to fire all cylinders of v8 engine black_13
At the risk of NOT overcomplicating the answer...
Two.
Unless you have a two stroke cycle engine. Aarcuda, dont you hate the "yeah but" and "what if" responses.:>)
Your answer was concise.
Or one of the various six-stroke oddities :-).
What about external combustion or one of the 8-6-4 type toys
We haven't even gotten to 'what if your ignition isn't working?'.
Welp, if it were a 2 stroke, the answer would still apply. ;-)
Thanks.
Only one cylinder fires at a time. cuhulin
The number of cylinders is irrelevant. A four stroke engine fires all cylinders in two revs, a two stroke engine in a single rev, no matter how many cylinders it has.
snipped-for-privacy@webtv.net wrote in news:1573-4B133D19-6369@storefull-
3173.bay.webtv.net:
True, but all eight are connected to the same crankshaft.
This means that once the crankshaft goes through two complete revolutions, all eight cylinders have performed one complete cycle of suck/squeeze/bang/blow, even if the sequence didn't start with "suck".
Depends on what you mean. Assuming you start counting when the a particular cyclinder fires, it will be 630 degrees before the other 7 have fired as well. In general, I think you would say two complete revolutions are need to insure that you ahve fired all eight cylinders.
0 degrees - first cylinder fires 90 degrees - second cylinder fires 180 degrees - third cylinder fires 270 degrees - fourth cylinder fires 360 degrees - fifth cylinder fires (1 complete revolution) 450 degrees - sixth cylinder fires 540 degrees - seventh cylinder fires 630 degrees - eight cylinder fires 720 degrees - first cylinder is going to fire again..... (2 complete revolutions)Ed
You are speaking only for a 4 stroke cycle engine. On a 2 stroke cycle engine, each piston fires on every revolution.
The best and most accurate and most concise response remains --
"The number of cylinders is irrelevant. A four stroke engine fires all cylinders in two revs, a two stroke engine in a single rev, no matter how many cylinders it has."
from "Thomas Tornblom"
hls wrote:
How about a Wankel? They are four stroke.....
Ed
Yea, I guess that's technically true, depending on the definition of "stroke". Here's a great animation from HowStuffWorks. Make sure to click on the "cycle breakdown" button in the upper right to clearly see each "stroke".
Diesel engines don't need spark plugs. cuhulin
A four stroke that has a power stroke for every rotation of the crankshaft, two if it's a two rotor motor. Three power strokes for every revolution of the rotor. Wow.
Different strokes for different folks. The guy said the exhaust blew the paint off of the ceiling. cuhulin
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