Here is a video of go kart engine valvetrain tested on Spintron machine. It's amazing the amount stress the engine deals with at such high RPM, even with an engine that small, the thing failed at 9000RPM. Honda just gets my respect for creating 9000RPM S2000 that's as reliable as an Accord.
Hope it's not a repost, enjoy:
Link to the video

 

Amazing how the springs continue to oscillate almost the entire time. Good vid.

 

doesn't look stressful at slow mo. wonder what component determines if it fails or not

 

cool vid.
what push rod engine can rev to 9k rpm.

 

LOL i was thinking that, and at the end of the video the pushrod fell out ahha

 

[QUOTE=VAD,Apr 10 2008, 11:18 AM] Amazing how the springs continue to oscillate almost the entire time.

 

I still maintain that the F20/22C is one of the best production motors ever put into a vehicle.

- For its relatively low displacement is produces good amounts of torque
- It produces astonishing levels of horspower
- It is dead reliable, more so than many "less-stressed" engines
- It is VERY fuel-efficient
- It is has very low emissions

^All this from a motor that was designed in the LATE 90s!

Other high-revving motors such as BMW's S54 and their new V8 explore the high-rpm concept but aren't reliable (remember the rod-bearing failures on early S54s)- so much so that BMW will rarely offer an extended warranty on an M-car.

Toyota's own high revving 1.8 in the Celica GT-S had its own issues at high rpms.

I'd like to see how Audi's high revving V8 in the RS4/RS5 performs with regards to reliability - but being an Audi, I don't have much faith.

If Honda/Acura follows through with its plan for a 4.5 to 5.5l V10 in the future NSX, one can expect it to be a MASTERPIECE.

 

what issue did it have??

I had a 01 celica and revved it up to 8800 on a daily basis for about 40k miles...for shit and giggle, i revved it to 9k a few times. I had a standalone (apexi power fc) with i/e/h. It made 194 whp.

the only issue with the celica back then was the lift bolt. Some lift bolt broke and some don't. I checked my and it didn't break or stripped at all. Anyways, I do agree that the F20/F22 are awesome motors. I just wish they incorporated the i-vtec in the car so we can do some serious tunning like the rsx with the k-series motor. Oh well.

Cool video but slow mo video didn't make it seem that bad.

 

 

I was a cam designer for Comp Cams for a few years. We used the Spintron to replicate the combusion cycle of a full cylinder head without burning any fuel. It was an electrically driven system that rotated the "motor". We used a laser encoder to follow the valve lift at specific rpms to alter cam designs and high speed cameras to watch the activity of the valvetrain components.

Imagine a pushrod engine doing 10,000 rpm for 500miles, it happens.

the pushrod design may have been around for a long time, but it's not old technology.