cams in
10-29-2004, 03:57 PM
#11
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Marc, click here. ---->Well, ****, that only shows the intake valve opening.
Watch 1 of the 2 diagrams. Now, just picture the numbers I gave as amounts of time if you will. Watch the correlation of the intake vs. exhaust valve opening and shutting.
IO = intake valve opens
IC = intake valve closes
EO = exhaust opens
EC = exhaust closes
See if that helps.
Watch 1 of the 2 diagrams. Now, just picture the numbers I gave as amounts of time if you will. Watch the correlation of the intake vs. exhaust valve opening and shutting.
IO = intake valve opens
IC = intake valve closes
EO = exhaust opens
EC = exhaust closes
See if that helps.
10-29-2004, 10:05 PM
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remember the amount of advance ground into the cam is mainly to take into the account of timing chain stretch. that way it keeps the valve events inline with the crankshaft. even a new chain won't keep the cam exactly where it's supposed to be. you can install a new chain, turn the crank and you 'll see it move a couple of degrees until the chain tightens up on the downward side of the chains direction of movement before the cam starts to turn. damn cam manufacturers, they think of everything don't they.
10-29-2004, 11:46 PM
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Do double rollers stop stretch?
How many degrees worth of stretch does a timing chain usually have in it, by X amount of use?
How many degrees worth of stretch does a timing chain usually have in it, by X amount of use?
ex. is there 5 degrees advanced, so by 30,000 miles you will have 3 degrees?
10-30-2004, 08:17 AM
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Originally Posted by SportSide 5.3
Do double rollers stop stretch?
How many degrees worth of stretch does a timing chain usually have in it, by X amount of use?
How many degrees worth of stretch does a timing chain usually have in it, by X amount of use?
10-30-2004, 08:24 AM
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How does Vinci decide on 5*?
----
The reason I ask is; If its not known how much stretch the timing chain will have after X (the users amount of wear put on the motor), then why grind in 5 degrees advancement into the camshaft? It would probably be smarter, if your going to play it this way, to ask the driving conditions exc. to figure out how much extra advance to set in the camshaft, so you come out even, later down the road. At least, this would be a more effective guess.
I'd personally, want my camshaft set up to my engine. Just install a double roller and have it coated exc. to protect the chain from stretching.
You said, the cam manufacturers think of everything, but really it sounds more like a guessing game. Like you said, what if you get 10* worth of stretch.
----
The reason I ask is; If its not known how much stretch the timing chain will have after X (the users amount of wear put on the motor), then why grind in 5 degrees advancement into the camshaft? It would probably be smarter, if your going to play it this way, to ask the driving conditions exc. to figure out how much extra advance to set in the camshaft, so you come out even, later down the road. At least, this would be a more effective guess.
I'd personally, want my camshaft set up to my engine. Just install a double roller and have it coated exc. to protect the chain from stretching.
You said, the cam manufacturers think of everything, but really it sounds more like a guessing game. Like you said, what if you get 10* worth of stretch.
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