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Posted by: SirAndy Nov 14 2003, 05:37 PM

for each full revolution of the crank (360 deg), how many power-strokes do you have on a 4-cylinder boxer?
1?

or, to be more precise, how many OPEN intake valves do you have per full revolution of the crank? (ignore overlap, only full open valves).

Andy

Posted by: ArtechnikA Nov 14 2003, 05:45 PM

2

the four strokes are (officially) Suck - Squeeze - Bang - Blow. in that order.

each cylinder fires every two revolutions of the crankshaft == 1 revolution of the camshaft.

so you get half as many of each stroke in a crankshaft rev as there are cylinders. (4 cyl == 2 intake, 2 compression, 2 power, 2 exhaust). you get you cylinders' complement in a complete revolution of the camshaft ( == 2 crank revs).

and since a power stroke 'makes power' over about 120 crankshaft degrees, this is why 6's are so smooth - you have 1 cylinder making power at all times.

Posted by: SirAndy Nov 14 2003, 05:48 PM

thank you sir!

Andy

Posted by: Kerrys914 Nov 14 2003, 06:13 PM

Suck - Squeeze - Bang - Blow

Ahhhhhh Yes it is Friday night

Cheers
Kerry

Posted by: madd_dogg_914 Nov 14 2003, 06:23 PM

I am definitely gonna have to remember that!

-Chris

Posted by: Bruce Allert Nov 14 2003, 06:48 PM

sucksqueezebangblowsucksqueezebangblowsucksqueezebangblowsucksqueezebangblowsuck
squeezebangblowsucksqueezebangblowsucksqueezebangblowsucksqueezebangblow

OH BABY



BRUCE

Posted by: Jeroen Nov 14 2003, 06:57 PM

So, Bruce, how many RPM can you type?


cheers,

Jeroen

Posted by: DNHunt Nov 14 2003, 07:34 PM

More important, how long can it turn before the whole thing lets go

Dave

Posted by: kwales Nov 14 2003, 07:58 PM

Think I had a girlfriend like that once...



Ken