Valve float video

Rusty · 02-19-2018, 11:10 PM

For those who don't know about valve float. Here's a slo-mo video of it.

Jhill · 02-23-2018, 12:12 AM

That’s a pretty cool video. Makes me think someone needs to come up with valve spring shock absorbers to dampen the spring occultations. Not sure how one could do it but would be interesting.

BGTV8 · 02-23-2018, 12:31 AM

Dampers exist but I don;t have a picture and verbalizing the description is well past me as we had a great lunch and are now into the 3rd bottle of red .......... on Friday afternoon kickback time

Rusty · 02-23-2018, 12:41 AM

Quote:

Originally Posted by Jhill

That’s a pretty cool video. Makes me think someone needs to come up with valve spring shock absorbers to dampen the spring occultations. Not sure how one could do it but would be interesting.

It's been a while since I've played with valve springs. And the technology is changing.
Short answer. They do. A triple valve spring. The middle spring is called a damper spring. It's flat wound spring that goes between the 2 other springs. It raises the rpm at which float happens. It's suppose to help with vibrations in the springs.

Jhill · 02-23-2018, 01:28 AM

Quote:

Originally Posted by Rusty

It's been a while since I've played with valve springs. And the technology is changing.
Short answer. They do. A triple valve spring. The middle spring is called a damper spring. It's flat wound spring that goes between the 2 other springs. It raises the rpm at which float happens. It's suppose to help with vibrations in the springs.

I’m aware of 2 and 3 spring valve springs to all have a different natural frequency etc but some type of real damper system would be interesting and maybe allow less tension for reduced drag and less valve stem stretch etc.

I imagine the z is a two spring setup? I would be really surprised if it’s single spring running 7500 rpm

Rusty · 02-23-2018, 02:40 AM

Quote:

Originally Posted by Jhill

I’m aware of 2 and 3 spring valve springs to all have a different natural frequency etc but some type of real damper system would be interesting and maybe allow less tension for reduced drag and less valve stem stretch etc.

I imagine the z is a two spring setup? I would be really surprised if it’s single spring running 7500 rpm

Believe the beehive spring can run those rpms. How above that. I don't know. F1 and MotoGp used to run air springs at 20,000+ rpms.

jrb55gh · 02-27-2018, 07:23 AM

Quote:

Originally Posted by BGTV8

Dampers exist but I don;t have a picture and verbalizing the description is well past me as we had a great lunch and are now into the 3rd bottle of red .......... on Friday afternoon kickback time

Life is good in Australia!

BGTV8 · 02-27-2018, 02:02 PM

Quote:

Originally Posted by jrb55gh

Life is good in Australia!

Gotta be over 65 to join this club ....

Rusty · 02-27-2018, 03:01 PM

Quote:

Originally Posted by BGTV8

Gotta be over 65 to join this club ....

Almost there.

02-19-2018, 11:10 PM	#1 (permalink)
Rusty Ronin Samurai - Assassin Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 68 Posts: 34,857 Drives: 2011 Nismo GM 6M Rep Power: 2684436	Valve float video For those who don't know about valve float. Here's a slo-mo video of it. phunk, Jhill and ZontheRocks like this. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

02-23-2018, 12:31 AM	#3 (permalink)
BGTV8 A True Z Fanatic Join Date: Dec 2009 Location: 03350 Australia Posts: 1,503 Drives: 09 Nissan 370Z M6 Rep Power: 29907	Dampers exist but I don;t have a picture and verbalizing the description is well past me as we had a great lunch and are now into the 3rd bottle of red .......... on Friday afternoon kickback time Rusty likes this.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Valve Caps	scottIN	Wheels & Tires	13	08-31-2016 10:11 PM
Seat Position and Highway Float (2014 Nismo)	nismo2evox	Nismo 370Z	7	06-02-2016 03:37 PM
PCV Valve Servicing ?	Dwight Frye	Nissan 370Z Warranty / Scheduled Maintenance / Servicing / Repairs	1	07-28-2014 08:06 PM

02-23-2018, 12:12 AM	#2 (permalink)
Jhill Track Member Join Date: Mar 2016 Location: San jose Posts: 846 Drives: 2013 370z sport Rep Power: 3384	That’s a pretty cool video. Makes me think someone needs to come up with valve spring shock absorbers to dampen the spring occultations. Not sure how one could do it but would be interesting.