What Thought Crosses Your Mind ?
 

After you watch the whole vid ?

https://www.youtube.com/watch?v=nsa6kq-qqIE&feature=player_detailpage

Looks like it may be leaking oil a bit. :)

Cool video, but kind of stressful at those high rpms. I caught myself cringing and tightening my shoulders. I must have been wondering if it was gonna go BOOM!

Ya that was a little stressful, I was waiting for the BOOM. I need a drink now geez. :)

Thanks for helping me waste an hour of my work day. Now I am watching videos of combustion chambers and valve float. LOL

Interesting to see that the BMW MC guys manage to make the valve rotate slowly while opening 116 time per second. (14000 rpm)
http://en.wikipedia.org/wiki/BMW_S1000RR

I'm going to hug and kiss my valve springs next time I see them... :cool-smiley-011:

COMPRESSION is the first thing that comes to my mind - open chamber but of course this engine is spinning on a simulator like what some engine reman facility's have with a SIM test but they do not spin anything that fast. Possible a Spintron machine like what all Nascar teams use.

Valve float comes to mind

It is amazing a simple mechanical system can move fast enough to operate at those speeds.

Balanced stability .

If youtube spintron they have some valve springs in motion and at slow speeds video along with other engines spinning up. In one of their vids the valve spring bouncing all over the place very uncontrollable. Amazing to watch and how it can maintain within its functional limits and then as we all know can not maintain within all limits.

Funny how 10 to 16 k rpms just looks like everything is standing still because your eyes can not focus on things moving that fast.

^^^^ I was going to say the same thing. It would be kind of cool if they had a tach on the screen so you could see at what rpm you can no longer see the springs being compressed. My other thought was when is this thing going to go BOOM!!

Buzz saw is all i can say. It's amazing to see i kept expecting that cam to just tear those tips to shread's...or buzz them to shread's


https://www.youtube.com/watch?v=_REQ1PUM0rY&feature=player_detailpage Slow it done a bit not so radical...there's old people here ya know.

So, how do I get my daughter's go kart to rev to 14,000 rpm? It has an overhead valve engine so just a quick cam and spring change? :)

Exactly one of my first thoughts. As it came to the top rpm, it literally reminded me of cutting some roll cage tubing with a big chop saw.

Quickly followed by what the heck kind oil can keep this schit together ! LOL.

Obviously another one of my thoughts was - oh my fking valvesprings !!!!!!

Another - how the hell is air and fuel supposed to get in there that fast ?

Many, many more of course.

Amazing stuff ! Just wanted to share an OMG !!!!

Amazing, amazing....

i never knew the valve spring rotated like that.

Yamaha R6 revs to 16,200 ( tach says 17,500) Its amazing and the engines last a long time. I have a customer who regularly runs it to redline with 20k+ plus miles on the clock.

you need to watch more youtube video.:)

There was a Honda bike that you could watch spin up to around 17 K on youtube a couple of years ago. Looked like nothing moving just sitting still because it was spinning so fast.

And.....valvetrain runs half speed of crank/rod/pistons. Thus why discussion of piston speed comes up here and there.

Amazing stuff for sure.

And here is the sounds of a Renault V10 at a mesmarizing (sp?) 20,000 rpm.

https://www.youtube.com/watch?feature=player_embedded&v=nX2L-kS7ZL8

You'll love this. Tortuous 21,000 rpm on a race simulating dyno.

https://www.youtube.com/watch?feature=player_embedded&v=y3QG8V5BkME#t=43

^^^^^^^^ I'd like those asian girls to simulate some high rpm on my lap......to show me how the piston moves in the bore, and how important a tight ring seal is.

The things a man could do with 21,000 RPMs...

just for mild and a few others :D
http://i61.tinypic.com/153setv.jpg

Two thoughts come to mind:

It's amazing that these engines work at those speeds, OHC or pushrod.

Someday someone will invent a much simpler engine that will be almost bulletproof. The Wankel didn't work out and turbines are expensive and have other drawbacks. The piston engine will be a museum piece one day.

So true. Pistons engines really are barbaric but thats all we have for now.

well there was the Coates valve which is an excellent idea.

Honestly, my first thought- That's some damn good steel.

Everyone loves to see 'billet' (misnomer buzzword, I digress), but in a hard service like that you just have to respect the superiority of good steel. Of course proper heat treat, and excellent machining practices also contribute.

All I can say is that after see these video's -- AND I DON'T WANT TO START AN OIL THREAD DISCUSSION!!!!

I won't use ANYTHING but synthetic oil in my engines. While most are not spinning to this level of rpm's something has got to give- and knowing that there are only a few microns separating functional from disaster -- isn't too comforting.

When you really stop and think about the tolerances that these engines are being built to - I hope their gage calibration process/metrology is really up to snuff!!

Take care!

3pointstar

Of course it is, they can't afford for it not to be. Look up a Gage R&R study, the precision in a modern engine is no accident.

The level of sophistication and absolute quality that the US, the Japanese, the Germans, etc, can deliver day in, day out from a modern production line is not respected and almost incomprehensible.

AMEN!!!!!!!

I work in the Medical Device market - all I can say is that from my experience (over 30+ years)- the "gear head" mentality or perception that machinists are low level workers is absolutely WRONG-- the machinists that I've dealt with are skilled artisans. The days of some jerk running a mill or lathe (while might exist in remote locations) are long gone -- I've seen people that from outward appearances wouldn't let them pump gas in my car (boat) make these systems sing - they know programing and tolerance setting, stack-up tolerance assessments etc., like the back of their hand.

Hats off to our machinists!!!

3pointstar

There is a SAE paper investigating how it is possible ( in the 70s) for the Japanese to manufacture motor cycle engines with just under 100 hp per liter and with total reliability.
At the same time, remember what Harley delivered in the 70s performance and quality wise......or the GM smog 350.....
(Not starting a ware here, I sold my 09 Ultra for the boating life style and I have owned a 73 Vette 350)

The conclusion in the SAE paper was, .......tolerances! No fancy alloys, bearing material or anything except exact tolerances.
Did I just do an ad for the custom built marine engines.....

Ahh i alway's knew wet manifolds were the future and as to tbi....:party-smiley-004:

I fully understand your comments- and for the most part agree-
However, I would just like to offer maybe somewhat of a different perspective - While I agree that tolerances are critical- they are only 1 input to the process. We need to assure that the “system” is capable of meeting and maintaining the tolerance of any part. For example, a machinist may be able to hold +/- 0.00001 for a given dimension – but the material itself may not have the structural integrity to maintain that critical tolerance is real-life usage. So just holding to a very strict tolerance does not assure that an item is really going to work or last- Yes, I would assume that a custom made engine has a better chance of success that an “off the shelf” item- because there is care in making and assembling the system. However, if the custom shop uses “shoddy” starting materials – it doesn’t matter how well it is machined or put together-- It’s not going to last very long.
Hope this makes sense??

^^^^Agree^^^^^

An everday, everyone drives one, example is 'how does an ECU know your engine has a cylinder misfire ?"

Most think, the ECU knows from the ignition itself.

Not many know, that most ECU's watch crank deflection/acceleration/deceleration for misfire.

Just think what the crank is doing during detonation ? Or when clutch is being dumped ? Or landing in a boat after being airborn.

So yes, materials and clearances are ultra important !

those F1 engines use pneumatic valve control to open and close the valves at those speeds. Everything is super light in those engines, hence the ability to rev up and back down to idle so fast..

https://www.youtube.com/watch?v=H4Bm7BWIWpk

The first thought that crossed my mind was I wish my motors were "pushrod free". The second thing that came to mind is my buddy in NH has too much spare time on his hands.:D

Yup. Freakin cold + windy here. Customer's went south or in hibernation.

Anybody want anything cyro'd ? We can just put your valvesprings outside. LOL.

Here is the weather just an hr North of me on top of our famous 'Rockpile'

Mount Washington Weather


Wednesday, March 18 2015 5:01 PM

Current Summit Conditions


Temperature: -13°F
Gust: 97 mph
Wind: 87 mph
Wind Chill: -57°F
Direction: 310°(NW)




Hourly Weather Observations (NWS)

Current Summit Forecast



A strong low over the Canadian Maritimes will bring continued summit fog and upslope snow showers through the day. Additionally, the low will continue to keep winds elevated with gusts reaching well over 100 mph today, tonight, and into early Thursday. Cold air will continue to flow in from the northwest keeping temperatures well below normal for mid-March. The high winds and cold temperatures will increase the risk of frostbite on exposed skin for most of the forecast period. Therefore, a wind chill warning will remain in place until early Friday morning. With severe conditions today through Thursday morning, hiking above tree line will be extremely risky. As a result of the high winds, summit staff will be unable to assist in any search and rescue should they arise. All efforts will be coming from below and will be slow going or possible postponed until safer conditions return for search parties. Hikers should be mindful that a single injury may keep them on the mountain for an extended period of time and will potentially put several lives at risk, not just their own in the coming days. Thursday afternoon will finally see gradually improving conditions as high pressure builds and with it, drier air. This drier air mass will move in from the west and allow fair skies to return over the summits for the afternoon and overnight hours. Thursday night into Friday, winds will finally dampen as the high starts to crest in and a light return flow allows temperatures to slowly start to rebound to more seasonable readings.

MORNING CONDITIONS



Temperature: -12 °F
Wind: 320°(NW) 90 mph
Weather: Fog, Light Snow, Blowing Snow
Visibility: 25 feet
Relative Humidity: 100%
Station Pressure: 23.06 inHg and steady
Ground Conditions: 18 inches Snow, ice, and rime w/ deeper drifts

YESTERDAY'S WEATHER

Max Temperature: 24°F
Min Temperature: -10°F
Peak Wind Gust: 350° (N) 124 mph
Avg Wind Speed: 53.8 mph
Liquid Precipitation: 0.53 inches
Snowfall: 3.9 inches


Wednesday:
In the clouds w/ snow showers and flurries likely. Possible additional snow accumulation of Trace to 2 inches.
High: Around 15 below
Wind: NW at 80-100 mph decreasing later to 70-90 mph w/ gusts up to 120 mph
Wind Chill: 60 below to 70 below


Wednesday Night:
In the clouds.
Low: Around 20 below
Wind: NW at 70-90 mph w/ gusts up to 105 mph
Wind Chill: 60 below to 70 below


Thursday:
In and out of the clouds trending towards clearing under partly sunny skies.
High: Rising to around 10 below in the afternoon
Wind: NW at 70-90 mph w/ gusts up to 100 mph decreasing later to 50-70 mph
Wind Chill: 60 below to 70 below rising to 50 below to 60 below


Thursday Night:
In the clear under partly cloudy skies.
Low: Around 10 below then rising to around 5 above late
Wind: NW shifting W at 50-70 mph decreasing to 25-40 mph
Wind Chill: 50 below to 60 below rising to 20 below to 30 below

Pretty cool video. Must say a lot of things come to mind however what the red color lube that doesn't seem to brake down and remains consistent throughout the video. Cam lube? You'd think with the rpm and temps it would have dissolved.

Ooopps. Frozen fingers. Double post.