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Results tagged with valve-timing
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user 4152
3
votes
Why don't valvetrains use an idler gear between the cam gears
Bottom line is: It's been done.
Here's one for a small block Chevrolet engine:
Just as you describe, there's an idler gear (well, maybe two) which keeps things in time.
These gears are used mostl …
- 162k
5
votes
4 stroke valve timing diagram: if valves are open during TDC, wouldn't they hit the piston?
First, remember that we are talking about four different engine cycles here: Intake; Compression; Ignition/Combustion; Exhaust. Top dead center (TDC) happens between two of these cycles: between Compr …
- 162k
1
vote
TDC on DOHC but with cams removed
On a 4-stroke engine, when #1 is at TDC, it's at TDC. It doesn't matter at that point if the cam(s) are not connected. Once you align the cam timing mark(s), then you'll set which stroke you are on.
…
- 162k
4
votes
How to test timing chain/belt assembly before sealing engine closed?
The best way to test to see if your engine is timed correctly is to rotate the crank shaft through 720° of rotation then check your timing marks again. Since you (supposedly) have a non-interference m …
- 162k
3
votes
When switching off the engine, do the cam and crank shafts always come to rest in an initial...
No. An engine stops where it stops because it is random when you turn the ignition off, and therefore there is no set place for it to end up at.
- 162k