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Author Topic: Video: Valves @10K in a B18C  (Read 8579 times)

Ghetto_D

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Video: Valves @10K in a B18C
« on: April 20, 2009, 01:58:34 PM »

Valve Float
I was expecting shit to break, fucking valves are wobbling and spinning like crazy at those speeds,
Dont watch this video if you are epileptic!!

click on LQ to watch if video no worky


Some kid wanted me to chip his ecu on his stock LS to rev to 9K, i told him i wouldnt do it, not on a stock head. He asked me why, I told him because i didnt want him calling me the next day and asking why it shit the bed.
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patsmx5

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Re: Video: Valves @10K in a B18C
« Reply #1 on: April 20, 2009, 02:05:27 PM »

Cool vid. But don't think the valves are the only thing that bend and flex at high RPM and high loads. Your crank and rods are flexing and twisting too at high RPM and high loads.
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92CXyD

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Re: Video: Valves @10K in a B18C
« Reply #2 on: April 20, 2009, 02:23:50 PM »

The first valve and springs look like a sbf valvetrain.

onlyflash944

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Re: Video: Valves @10K in a B18C
« Reply #3 on: April 20, 2009, 02:48:57 PM »

awesome vid.  wonder if they have a video of the piston rings and wheather or not they spin while the engine runs.  i've always wondered if it really matters where you put the ring gap when installing the pistons
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brine04

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Re: Video: Valves @10K in a B18C
« Reply #4 on: April 20, 2009, 03:42:39 PM »

Yeah that's a push rod motor not a B18c.
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BoostForLife

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Re: Video: Valves @10K in a B18C
« Reply #5 on: April 20, 2009, 03:52:47 PM »

awesome vid.  wonder if they have a video of the piston rings and wheather or not they spin while the engine runs.  i've always wondered if it really matters where you put the ring gap when installing the pistons
It does matter how the rings go in.
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onlyflash944

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Re: Video: Valves @10K in a B18C
« Reply #6 on: April 20, 2009, 04:58:17 PM »

you're saying they stay there and never spin in the cylinder?

i find that hard to believe but i still followed the proper technique the last couple of builds
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ApexSilver06MR

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Re: Video: Valves @10K in a B18C
« Reply #7 on: April 21, 2009, 11:27:13 AM »

i never knew honda's use roller rockers
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dvst8r

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Re: Video: Valves @10K in a B18C
« Reply #8 on: April 21, 2009, 11:37:21 AM »

i never knew honda's use roller rockers

You can get them if your willing to pay the $$$
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ApexSilver06MR

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Re: Video: Valves @10K in a B18C
« Reply #9 on: April 21, 2009, 11:44:32 AM »

i never knew honda's use roller rockers

You can get them if your willing to pay the $$$

i know that.  i was just being stupid.  who would even spend money on shit like that...
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dvst8r

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Re: Video: Valves @10K in a B18C
« Reply #10 on: April 21, 2009, 11:55:00 AM »

i never knew honda's use roller rockers

You can get them if your willing to pay the $$$

i know that.  i was just being stupid.  who would even spend money on shit like that...

I would.
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onlyflash944

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Re: Video: Valves @10K in a B18C
« Reply #11 on: April 21, 2009, 12:01:11 PM »

i never knew honda's use roller rockers

You can get them if your willing to pay the $$$

i know that.  i was just being stupid.  who would even spend money on shit like that...

I would.


i would too, if money was disposable and i was going for full blown race car
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HiProfile

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Re: Video: Valves @10K in a B18C
« Reply #12 on: April 21, 2009, 12:54:35 PM »

FYI the valve should spin, especially the exhaust valve. Not like a top, but enough to keep from forming hotspots. Older engines had parts that induced rotation. The other thing, some of you guys know how long some valve guides are - its the valve end & spring that is flailing, not the entire valve stem. Its partly due to the huge gap they left between the roller and valve too.

IMO that vid sucked - there was virtually no float that I saw. 1/32" of float isn't really float. When the valve keeps moving downwards, then can't keep up with the returning rocker arm, that's the really bad "float". I'll admit the end was good in that it showed valves bouncing. Thats a nice way to loose compression.
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dvst8r

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Re: Video: Valves @10K in a B18C
« Reply #13 on: April 21, 2009, 02:18:52 PM »

...When the valve keeps moving downwards, then can't keep up with the returning rocker arm, that's the really bad "float"...

My old man used to have a harley, we called that the rev limiter...  :P
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jagojon3

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Re: Video: Valves @10K in a B18C
« Reply #14 on: April 22, 2009, 02:25:11 AM »

Gotta love stock roller rockers in a y5 head  8)
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Loserkidwac

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Re: Video: Valves @10K in a B18C
« Reply #15 on: April 22, 2009, 10:50:55 AM »

Gotta love stock roller rockers in a y5 head  8)


ha ha ha yea I was gonn add that I have a honda with roller rockers ;)

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rsmith2786

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Re: Video: Valves @10K in a B18C
« Reply #16 on: April 22, 2009, 11:15:30 PM »

That video is somewhat deceiving.  They take a single frame every revolution.  It's not real-time.  Same for combustion videos.  This was done where I previously worked:

In Cylinder Video ( How a 4 stroke engine works )
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spoonfedcrx

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Re: Video: Valves @10K in a B18C
« Reply #17 on: April 24, 2009, 11:28:56 PM »

Thats an awesome vid
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92CXyD

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Re: Video: Valves @10K in a B18C
« Reply #18 on: April 25, 2009, 04:33:14 PM »

Thats an awesome vid


+1

Yeah this vid is sweet. ;D

Four valve per cyl. :yes:
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