Video of overhead cam in action at 14k rpm
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A BMW S1000RR 193hp bike engine.
What I found interesting was the amount the valves and valve springs spun around at maximum rev's. The valves were floating, perhaps only to a slight extent but floating nonetheless.
What I found interesting was the amount the valves and valve springs spun around at maximum rev's. The valves were floating, perhaps only to a slight extent but floating nonetheless.
Originally Posted By: CATERHAM
A BMW S1000RR 193hp bike engine.
What I found interesting was the amount the valves and valve springs spun around at maximum rev's. The valves were floating, perhaps only to a slight extent but floating nonetheless.
I saw that too. Its at the point where the cams actually look as though they begin spinning the other way.
I saw the smoke and instantly thought that maybe an oil with a lower noack would vaporize less.
This bitog is a sickness
A BMW S1000RR 193hp bike engine.
What I found interesting was the amount the valves and valve springs spun around at maximum rev's. The valves were floating, perhaps only to a slight extent but floating nonetheless.
I saw that too. Its at the point where the cams actually look as though they begin spinning the other way.
I saw the smoke and instantly thought that maybe an oil with a lower noack would vaporize less.
This bitog is a sickness
Originally Posted By: Burt
My oil doesn't see anywhere near 14k. More like 2k with brief spurts to 4.
I disagree
On freeway ramp with no traffic my car sees average of 4.5-5k for about 20 seconds atlease.
My oil doesn't see anywhere near 14k. More like 2k with brief spurts to 4.
I disagree
On freeway ramp with no traffic my car sees average of 4.5-5k for about 20 seconds atlease.
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Originally Posted By: Voltmaster
Originally Posted By: Burt
My oil doesn't see anywhere near 14k. More like 2k with brief spurts to 4.
I disagree
On freeway ramp with no traffic my car sees average of 4.5-5k for about 20 seconds atlease.
You disagree? Are you and Burt sharing oil?
Originally Posted By: Burt
My oil doesn't see anywhere near 14k. More like 2k with brief spurts to 4.
I disagree
On freeway ramp with no traffic my car sees average of 4.5-5k for about 20 seconds atlease.
You disagree? Are you and Burt sharing oil?
I'd love to see a V8 Mustang do 5k RPM for 20 sec up an on ramp.
My Fit sees it daily... The results aren't very impressive.
My Fit sees it daily... The results aren't very impressive.
I can't remember the last time my Ion saw above 3000.
Originally Posted By: Falken
I'd love to see a V8 Mustang do 5k RPM for 20 sec up an on ramp.
My Fit sees it daily... The results aren't very impressive.
The 5.0L in my truck doesn't have a redline. The tach goes to 7,000 rpm. 5,000 is a piece of cake for the Coyote (and sounds good too!).
I used to shift my solid lifter cam Chevy drag car (w/ 355ci small block) at 6,000 rpm.
I'd love to see a V8 Mustang do 5k RPM for 20 sec up an on ramp.
My Fit sees it daily... The results aren't very impressive.
The 5.0L in my truck doesn't have a redline. The tach goes to 7,000 rpm. 5,000 is a piece of cake for the Coyote (and sounds good too!).
I used to shift my solid lifter cam Chevy drag car (w/ 355ci small block) at 6,000 rpm.
My cars shift point is 6400 and the fuel cutoff is at 6600.
I've done many a burnout with the engine just a'bouncin' off that limiter and it has never hurt a thing. It won't in almost any modern car as rev limiters are set to conservative settings from the factory.
I've done many a burnout with the engine just a'bouncin' off that limiter and it has never hurt a thing. It won't in almost any modern car as rev limiters are set to conservative settings from the factory.
Originally Posted By: MinamiKotaro
I can't remember the last time my Ion saw above 3000.
Time for some heavy footed driving to clean that engine/exhaust up!
When I was commuting there was almost never a day where my car wouldn't see 6K RPM and sometimes that was half a dozen times or more per day. Now that I work in town and I don't drive as much seeing more than 3-4K is uncommon. Thankfully I stretch the car's legs usually on weekends.
I can't remember the last time my Ion saw above 3000.
Time for some heavy footed driving to clean that engine/exhaust up!
When I was commuting there was almost never a day where my car wouldn't see 6K RPM and sometimes that was half a dozen times or more per day. Now that I work in town and I don't drive as much seeing more than 3-4K is uncommon. Thankfully I stretch the car's legs usually on weekends.
Originally Posted By: gregoron
I wonder why the smoke from the engine in video isn't being sucked up by the PCV.
'cause half the crankcase is missing.
I wonder why the smoke from the engine in video isn't being sucked up by the PCV.
Originally Posted By: Clevy
Originally Posted By: CATERHAM
A BMW S1000RR 193hp bike engine.
What I found interesting was the amount the valves and valve springs spun around at maximum rev's. The valves were floating, perhaps only to a slight extent but floating nonetheless.
I saw that too. Its at the point where the cams actually look as though they begin spinning the other way.
I saw the smoke and instantly thought that maybe an oil with a lower noack would vaporize less.
This bitog is a sickness
I've experienced valve float in in some modified cars I've had in the past; that's one of the factors that limit how high you can rev' an engine and heavier valve springs to solve the problem is counter-productive at lower rev's.
14,000 rpm may be about the rev' limit for metal valve springs.
F1 engine that rev' to 18,000 rpm use pneumatic (air) springs.
A lower NOACK rated oil isn't going to noticeably reduce the oil "vaporizing". I think what you're seeing is the oil being very finely atomized. The spec' oil is a 4T 10W-40 with a typical NOACK of 10%.
The other thing is, the camshafts rotate at half crankshaft speed. So what we're observing is "only" 7,000 rpm.
Originally Posted By: CATERHAM
A BMW S1000RR 193hp bike engine.
What I found interesting was the amount the valves and valve springs spun around at maximum rev's. The valves were floating, perhaps only to a slight extent but floating nonetheless.
I saw that too. Its at the point where the cams actually look as though they begin spinning the other way.
I saw the smoke and instantly thought that maybe an oil with a lower noack would vaporize less.
This bitog is a sickness
I've experienced valve float in in some modified cars I've had in the past; that's one of the factors that limit how high you can rev' an engine and heavier valve springs to solve the problem is counter-productive at lower rev's.
14,000 rpm may be about the rev' limit for metal valve springs.
F1 engine that rev' to 18,000 rpm use pneumatic (air) springs.
A lower NOACK rated oil isn't going to noticeably reduce the oil "vaporizing". I think what you're seeing is the oil being very finely atomized. The spec' oil is a 4T 10W-40 with a typical NOACK of 10%.
The other thing is, the camshafts rotate at half crankshaft speed. So what we're observing is "only" 7,000 rpm.
Originally Posted By: CATERHAM
A BMW S1000RR 193hp bike engine.
What I found interesting was the amount the valves and valve springs spun around at maximum rev's. The valves were floating, perhaps only to a slight extent but floating nonetheless.
Now you understand why Ducati does desmodromic valvetrains...
A BMW S1000RR 193hp bike engine.
What I found interesting was the amount the valves and valve springs spun around at maximum rev's. The valves were floating, perhaps only to a slight extent but floating nonetheless.
Now you understand why Ducati does desmodromic valvetrains...
Originally Posted By: SLCraig
Originally Posted By: MinamiKotaro
I can't remember the last time my Ion saw above 3000.
Time for some heavy footed driving to clean that engine/exhaust up!
I'll need to get a new timing chain first. The original is getting quite noisy. I wish it had a belt, much easier to change.
Originally Posted By: MinamiKotaro
I can't remember the last time my Ion saw above 3000.
Time for some heavy footed driving to clean that engine/exhaust up!
I'll need to get a new timing chain first. The original is getting quite noisy. I wish it had a belt, much easier to change.
Originally Posted By: CATERHAM
Originally Posted By: Clevy
Originally Posted By: CATERHAM
A BMW S1000RR 193hp bike engine.
What I found interesting was the amount the valves and valve springs spun around at maximum rev's. The valves were floating, perhaps only to a slight extent but floating nonetheless.
I saw that too. Its at the point where the cams actually look as though they begin spinning the other way.
I saw the smoke and instantly thought that maybe an oil with a lower noack would vaporize less.
This bitog is a sickness
I've experienced valve float in in some modified cars I've had in the past; that's one of the factors that limit how high you can rev' an engine and heavier valve springs to solve the problem is counter-productive at lower rev's.
14,000 rpm may be about the rev' limit for metal valve springs.
F1 engine that rev' to 18,000 rpm use pneumatic (air) springs.
A lower NOACK rated oil isn't going to noticeably reduce the oil "vaporizing". I think what you're seeing is the oil being very finely atomized. The spec' oil is a 4T 10W-40 with a typical NOACK of 10%.
The other thing is, the camshafts rotate at half crankshaft speed. So what we're observing is "only" 7,000 rpm.
I think the purpose of this video was to study valve float. It seems that they marked the valve springs with a red paint to watch it rotate with the cam at high speed. I wonder if there's an advantage to valve float as it rotates the valve top so it wears more evenly.
Originally Posted By: Clevy
Originally Posted By: CATERHAM
A BMW S1000RR 193hp bike engine.
What I found interesting was the amount the valves and valve springs spun around at maximum rev's. The valves were floating, perhaps only to a slight extent but floating nonetheless.
I saw that too. Its at the point where the cams actually look as though they begin spinning the other way.
I saw the smoke and instantly thought that maybe an oil with a lower noack would vaporize less.
This bitog is a sickness
I've experienced valve float in in some modified cars I've had in the past; that's one of the factors that limit how high you can rev' an engine and heavier valve springs to solve the problem is counter-productive at lower rev's.
14,000 rpm may be about the rev' limit for metal valve springs.
F1 engine that rev' to 18,000 rpm use pneumatic (air) springs.
A lower NOACK rated oil isn't going to noticeably reduce the oil "vaporizing". I think what you're seeing is the oil being very finely atomized. The spec' oil is a 4T 10W-40 with a typical NOACK of 10%.
The other thing is, the camshafts rotate at half crankshaft speed. So what we're observing is "only" 7,000 rpm.
I think the purpose of this video was to study valve float. It seems that they marked the valve springs with a red paint to watch it rotate with the cam at high speed. I wonder if there's an advantage to valve float as it rotates the valve top so it wears more evenly.
Yes the valves and springs rotating would even wear in the guides but when the valves float they are not sealing with a noticeable loss of power.
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