so im not a retard, i know what cams do and how, im looking for specifics now
what exactly does the duration/lift mean on a cam?
im sure that the lift is how much it lifts the lifter, so if the lift on a cam was .212, then the lifter would raise .212 inches.
can somebody explain duration to me?
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Premium sinc 6-17-04
i think duration means how long the valve stays open
Im a Xbox 360 fanboy...and damn proud of it!!
well i know that. i mean when it says the duration is 220, what exactly does that mean?
Land Pirates sail the open roads
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Premium sinc 6-17-04
yeh i was wonderin the same thing.
<img src="http://registry.gmenthusiast.com/images/jiggaman/personal_pic.jpg">
so something with a 220 duration would mean that for 220 of the 360 degrees of crank/cam rotation, the valve would be open? then possibly a 180intake/180exhaust would be best for boost so that there is no overlap?
Land Pirates sail the open roads
DISCLAIMER: If anything I say offends you, I don't care..wear a helmet. Also, the information
I post is what I know to the best of my knowledge. If I am wrong, please correct me so that
others as well as myself may learn.
Premium sinc 6-17-04
land pirates cavalier wrote:so something with a 220 duration would mean that for 220 of the 360 degrees of crank/cam rotation, the valve would be open? then possibly a 180intake/180exhaust would be best for boost so that there is no overlap?
i'm confused now. correct meif i'm wrong but wouldn't you want the exhaust profile to be a little more extreme due to the face that a turbo works of the exhaust so you can make boost faster??? id ont' know if this has relevance just a ???
I like my engines how i like my women.... rich and a little bit retareded
they never overlap
you have a 4cycle engine (aka a 4 stroke)
which means that there are 4 individual strokes
each stroke is ment for a specific action
first you have a intake stroke, where the piston moves down drawing in air( intake valve open)
then you have a compression stroke which compresses the air/fuel mix by moving the piston upward. In the 2.2 2200 it compresses it 8.5:1.(both valves closed)
3rd you have a combustion stroke where the spark plug ignites the compressed mixture pushing the piston down ward producing the power that turns your wheels(both valves closed)
4th you have an exhaust stroke where the piston moves upward pushing the exhausted mix out of the engine(exhuast valve open)
so as you see they never overlap each other
don't worry about it.
the valves might be open inbetween the exhaust and intake. the exhuast will be closeing as the intake is opening.
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hey sinrocker...i think you need to do 2 things.
1) STFU
2) go learn your terms. your speaking on crankshafts when the post is about camshafts. please stop posting until you know what your talking about. ive seen 4 posts by you lately and every one of them is FULL of wrong information. so please until you understand a car yourself please stop posting.
THANKYOUHAVEANICEDAY
I used to race cars, now I race myself.
5K PB: 24:50
10K PB: 54:26
owntage by the orange one
1989 Turbo Trans Am #82, 2007 Cobalt SS G85
hypsy wrote:hey sinrocker...i think you need to do 2 things.
1) STFU
2) go learn your terms. your speaking on crankshafts when the post is about camshafts. please stop posting until you know what your talking about. ive seen 4 posts by you lately and every one of them is FULL of wrong information. so please until you understand a car yourself please stop posting.
THANKYOUHAVEANICEDAY
go Hypsy GO!
Im a Xbox 360 fanboy...and damn proud of it!!
im just tired of all the misinformation around here right now. if i had any time and spare cash id go premium just so i could correct every wrong post i see
but im too busy working and running my car
I used to race cars, now I race myself.
5K PB: 24:50
10K PB: 54:26
did you think that maybe he just misunderstood the question? what he said did have to do with camshafts, but nothing to do with my question. doesnt mean you need to be disrespectful
Land Pirates sail the open roads
DISCLAIMER: If anything I say offends you, I don't care..wear a helmet. Also, the information
I post is what I know to the best of my knowledge. If I am wrong, please correct me so that
others as well as myself may learn.
Premium sinc 6-17-04
what he said has NOTHING to do with camshafts at all....except theyre part of the 4 cycle engine. his whole thing was about a CRANKshaft which does something TOTALLY different. and with all the bad info ive seen from him, and others to be fair, i did need to show a little disrespect. sometimes its the only thing that has any affect
I used to race cars, now I race myself.
5K PB: 24:50
10K PB: 54:26
Maybe your the idiot because he was answering a question about how overlap works. So why don't you shut the @!#$ up. Read more then the first post and you realize other questions have spawned too.
sinrocker wrote:they never overlap
you have a 4cycle engine (aka a 4 stroke)
which means that there are 4 individual strokes
each stroke is ment for a specific action
first you have a intake stroke, where the piston moves down drawing in air( intake valve open)
then you have a compression stroke which compresses the air/fuel mix by moving the piston upward. In the 2.2 2200 it compresses it 8.5:1.(both valves closed)
3rd you have a combustion stroke where the spark plug ignites the compressed mixture pushing the piston down ward producing the power that turns your wheels(both valves closed)
4th you have an exhaust stroke where the piston moves upward pushing the exhausted mix out of the engine(exhuast valve open)
so as you see they never overlap each other
don't worry about it.
the valves might be open inbetween the exhaust and intake. the exhuast will be closeing as the intake is opening.
Quote:
Maybe your the idiot because he was answering a question about how overlap works. So why don't you shut the @!#$ up. Read more then the first post and you realize other questions have spawned too.
Ok Mr. IMABE A HARDASS please show me where he says anything about camshaft overlap. the only thing he says is that it doesnt exsist....which is does BTW. its a very big part of finding the right camshaft setup. then show me where anyone has asked about the 4 cycle motor and how it works. You cant do either because he was so far off on his reply that it should never have been posted. Now in your own words..."Shut the @!#$ up."
Now this is why this site is going downhill. People always gotta be a internet toughguy. People always gotta say the first thing that comes to mind...even if its wrong. Newbies need to sit back and read a few posts and do some research before posting any questions and especially before posting a reply. Granted there may be some new people that have some training in this field, schooling or real life (i have both BTW), that have a clue what they are talking about but it seems the majority of people joining this site lately are young teens who are just getting their first cars and thinking a 200dB exhaust means you have mad, tyte power.
I used to race cars, now I race myself.
5K PB: 24:50
10K PB: 54:26
