Posted By: Mike H
Explain some engine theory to me...... - 03/06/11 10:50 PM
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?
Posted By: RodStRace
Re: Explain some engine theory to me...... - 03/06/11 11:01 PM
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.
Posted By: Yancy Derringer
Re: Explain some engine theory to me...... - 03/06/11 11:09 PM
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.
Posted By: bomber1965
Re: Explain some engine theory to me...... - 03/07/11 12:30 AM
one pin crank 
.....or you could mount all the pistons on one pin?!
