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Explain some engine theory to me...... #944288 03/06/11 06:50 PM 03/06/11 06:50 PM
Joined: Mar 2006 Posts: 253 Orange County, CA M Mike H OP enthusiast
Mike H OP enthusiast M Joined: Mar 2006 Posts: 253 Orange County, CA	If I had a crankshaft in front of me I probably wouldn't have to ask some of these questions. Sorry to show my ignorance, but.... Are the "throws" on the crank all at 90 degrees to each other? On one crankshaft revolution, do pistons 1-8-4-3 fire, and the next revolution 6-5-7-2 fire?

Re: Explain some engine theory to me...... [Re: Mike H] #944289 03/06/11 07:01 PM 03/06/11 07:01 PM
Joined: Sep 2005 Posts: 12,481 Chino Valley RodStRace I Live Here
RodStRace I Live Here Joined: Sep 2005 Posts: 12,481 Chino Valley	V8? Each of the 4 throws are at 90 degrees to each other, for a total of 4 different (90 4 times = 360 degreees) Since the 2 banks of cylinders are 90 degrees apart, one cylinder fires every 90 degrees. Each cylinder fires every other revolution, so it takes 2 complete revolutions to fire all 8 cylinders. 8X90 = 720 degrees.

Re: Explain some engine theory to me...... [Re: RodStRace] #944290 03/06/11 07:09 PM 03/06/11 07:09 PM
Joined: Oct 2010 Posts: 606 Montana Y Yancy Derringer mopar
Yancy Derringer mopar Y Joined: Oct 2010 Posts: 606 Montana	Well you probably don't want to hear this little complication, but there are what used to be called "flat cranks" which have the throws at 180* I believe Ferrari does or did use these. At one time, a certain amount of drag racers used to experiment with 'em.

Re: Explain some engine theory to me...... [Re: Yancy Derringer] #944291 03/06/11 07:16 PM 03/06/11 07:16 PM
Joined: Feb 2003 Posts: 21,318 Manitoba, Canada DaytonaTurbo Too Many Posts
DaytonaTurbo Too Many Posts Joined: Feb 2003 Posts: 21,318 Manitoba, Canada	Quote: Well you probably don't want to hear this little complication, but there are what used to be called "flat cranks" which have the throws at 180* I believe Ferrari does or did use these. At one time, a certain amount of drag racers used to experiment with 'em. That would be basically the same as an inline engine crank. I always figured the reason the v8 cranks were offset like that was for engine smoothness or something to do with the way the crank gets worked under load...

Re: Explain some engine theory to me...... [Re: DaytonaTurbo] #944292 03/06/11 08:30 PM 03/06/11 08:30 PM
Joined: Oct 2010 Posts: 146 rhode island B bomber1965 member
bomber1965 member B Joined: Oct 2010 Posts: 146 rhode island	one pin crank .....or you could mount all the pistons on one pin?!

Re: Explain some engine theory to me...... [Re: DaytonaTurbo] #944293 03/06/11 08:39 PM 03/06/11 08:39 PM
Joined: Oct 2010 Posts: 606 Montana Y Yancy Derringer mopar
Yancy Derringer mopar Y Joined: Oct 2010 Posts: 606 Montana	Quote: Quote: Well you probably don't want to hear this little complication, but there are what used to be called "flat cranks" which have the throws at 180* I believe Ferrari does or did use these. At one time, a certain amount of drag racers used to experiment with 'em. That would be basically the same as an inline engine crank. I always figured the reason the v8 cranks were offset like that was for engine smoothness or something to do with the way the crank gets worked under load... Depends on the "inline" 6 cylinder engines are not 180, they are every third of a turn, IE every 120 4 whanger would be 180

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