For all you gearheads.
- Thread starter cven
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i understand this is not a normal car engine, but do the valve springs rotate like that on normal car engines?
Originally Posted By: Jakegday
i understand this is not a normal car engine, but do the valve springs rotate like that on normal car engines?
I was wondering the same thing. Of course, normal car engines don't turn at 14k+ RPMs
i understand this is not a normal car engine, but do the valve springs rotate like that on normal car engines?
I was wondering the same thing. Of course, normal car engines don't turn at 14k+ RPMs
Yes.
I'd be interested to see that on one of those 10,000 FPS cameras.
They may use a flat needle bearing under the spring like on MB diesels.
Originally Posted By: hate2work
Originally Posted By: Jakegday
i understand this is not a normal car engine, but do the valve springs rotate like that on normal car engines?
I was wondering the same thing. Of course, normal car engines don't turn at 14k+ RPMs
Most engines have valve rotators that rotate the valves to slow down wear and to keep the seats and valves clean.
The 4.0L Jeep wont start spinning the valves until 3500 rpm so guys that never rev theirs tend to get performance robbing carbon on one spot on the valves.
Originally Posted By: Jakegday
i understand this is not a normal car engine, but do the valve springs rotate like that on normal car engines?
I was wondering the same thing. Of course, normal car engines don't turn at 14k+ RPMs
Most engines have valve rotators that rotate the valves to slow down wear and to keep the seats and valves clean.
The 4.0L Jeep wont start spinning the valves until 3500 rpm so guys that never rev theirs tend to get performance robbing carbon on one spot on the valves.
Here's a somewhat similar vid someone posted a while back: http://www.youtube.com/watch?v=sLQWEnQmmyY It's four pistons open on a running V8 engine
I believe that only a pushrod lifter needs to rotate in it's bore, not the valve necessarily; in the original video, the entire spring seems to be rotating, which may indicate valve float. I found this video on youtube to illustrate:
http://www.youtube.com/watch?v=_REQ1PUM0rY&feature=related
http://www.youtube.com/watch?v=_REQ1PUM0rY&feature=related
Originally Posted By: bigbird_1
Yes, the valve springs rotate in car engines as well.
That's why they used to use "hairpin" valve springs in some older motorcycle engines (aka - Ducati, Norton, etc.)
Yes, the valve springs rotate in car engines as well.
That's why they used to use "hairpin" valve springs in some older motorcycle engines (aka - Ducati, Norton, etc.)
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