Piston-valve contact?

iVTECpower · 03-07-2007, 06:50 PM

I was coming off of base onto the highway that connects our town to the AFB and I was talking on my phone (stupid) and I downshifted to pass from 5th to 2nd instead of 4th. I was going about 65 or so I think. Could I have possibly caused piston-valve contact. The tach was pinned at 9k, I'm not stupid so I hit the clutch immediately but it had already slowed the car some. I'm such a great driver I thought this would never happen to me. I should not have been talking on my phone and trying to shift with my left hand

. I'm extremely disappointed in myself so don't flame me plz

razer · 03-07-2007, 07:17 PM

Quote:

Originally Posted by iVTECpower

I was coming off of base onto the highway that connects our town to the AFB and I was talking on my phone (stupid) and I downshifted to pass from 5th to 2nd instead of 4th. I was going about 65 or so I think. Could I have possibly caused piston-valve contact. The tach was pinned at 9k, I'm not stupid so I hit the clutch immediately but it had already slowed the car some. I'm such a great driver I thought this would never happen to me. I should not have been talking on my phone and trying to shift with my left hand

. I'm extremely disappointed in myself so don't flame me plz

your not alone, i did the same thing while talking on my phone but i caught it at 6000 rpm

UncleSid · 03-07-2007, 07:21 PM

if it only revved to 9k and ur engine didnt explode and no CEL i think you should be fine...
usually if im goin 65 and wanna pass someone hardcore i downshift to 3rd...and thats not too far from 2nd.

xlur8ed · 03-07-2007, 07:31 PM

How does the car run? Idle? CEL? Leaking oil? Did it die when it pegged 9k?

If it runs and drives normal, I wouldn't worry. If any of the above are present, then I would be very concerned

Kidekat · 03-08-2007, 02:23 PM

The only way you get piston to valve contact is if your timing chain snaps allowing the two assemblies to rotate freely. Or if the gear skips a few tooths.

cappykd · 03-08-2007, 02:52 PM

Quote:

Originally Posted by Kidekat

The only way you get piston to valve contact is if your timing chain snaps allowing the two assemblies to rotate freely. Or if the gear skips a few tooths.

WRONG! The K20 will have piston to valve contact from excessive over revving.

udumkid · 03-08-2007, 03:18 PM

Quote:

Originally Posted by cappykd

WRONG! The K20 will have piston to valve contact from excessive over revving.

"valvefloat"

KShirza1 · 03-08-2007, 04:32 PM

that can cause the head grenade... that sort of contact is very common in a over rev situation and not just in k-series. ive done ot before. take off your valve cover and check you cams and rocker arm assembly. this seriouse, so get checked out.

kamikaze84 · 03-08-2007, 05:20 PM

thats what a rev limiter is for.

06blaksi · 03-08-2007, 05:28 PM

Quote:

Originally Posted by kamikaze84

thats what a rev limiter is for.

Rev limiter doesn't work on a mis-shift....as long as it was under 10k you should be ok

cappykd · 03-08-2007, 05:37 PM

Quote:

Originally Posted by kamikaze84

thats what a rev limiter is for.

The rev limiter will NOT protect against a missed shift over rev, it only helps prevent over rev when shifting at the redline..

rmfa · 03-08-2007, 05:52 PM

You would know immediately if you were going to have a problem.

SWiFTA06Si · 03-08-2007, 10:05 PM

ive had the same thing, and when i brought my car in for an oil change they noticed some dirty oil marks right underneath where the cam sensors are, the leak isnt noticable by watching it in idle but i cleaned it a few times and when i checked it there was more oil... Has anyone had to deal with this and figure out the problem....

fyreant · 03-08-2007, 10:20 PM

^^you shouldnt have to worry about it.. the dealership should......

radiocontrolhead · 03-09-2007, 12:05 AM

I must have read this same problem on here 4 times from different users. Search works wonders.

***CaliGuy*** · 03-09-2007, 12:18 AM

Quote:

Originally Posted by radiocontrolhead

I must have read this same problem on here 4 times from different users. Search works wonders.

Werd

WOOCHOW · 03-25-2007, 02:12 PM

you're fine. go right ahead and keep yapping on your stupid phone, loser

03-07-2007, 06:50 PM	#1 (permalink)
iVTECpower Member Join Date: Nov 2006 Location: ID Age: 22 Posts: 63 Ben iTrader: 0 / 0%	Piston-valve contact? I was coming off of base onto the highway that connects our town to the AFB and I was talking on my phone (stupid) and I downshifted to pass from 5th to 2nd instead of 4th. I was going about 65 or so I think. Could I have possibly caused piston-valve contact. The tach was pinned at 9k, I'm not stupid so I hit the clutch immediately but it had already slowed the car some. I'm such a great driver I thought this would never happen to me. I should not have been talking on my phone and trying to shift with my left hand . I'm extremely disappointed in myself so don't flame me plz

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03-07-2007, 07:21 PM	#3 (permalink)
UncleSid Senior Member Join Date: May 2006 Location: Taylor MI Age: 24 Posts: 660 Sid iTrader: 1 / 100%	if it only revved to 9k and ur engine didnt explode and no CEL i think you should be fine... usually if im goin 65 and wanna pass someone hardcore i downshift to 3rd...and thats not too far from 2nd.

03-07-2007, 07:31 PM	#4 (permalink)
xlur8ed Senior Member Join Date: Mar 2006 Location: Fargo, ND Posts: 156 iTrader: 0 / 0%	How does the car run? Idle? CEL? Leaking oil? Did it die when it pegged 9k? If it runs and drives normal, I wouldn't worry. If any of the above are present, then I would be very concerned

03-08-2007, 02:23 PM	#5 (permalink)
Kidekat Senior Member Join Date: Jan 2007 Location: Placentia, CA Posts: 715 iTrader: 0 / 0%	The only way you get piston to valve contact is if your timing chain snaps allowing the two assemblies to rotate freely. Or if the gear skips a few tooths.

03-08-2007, 04:32 PM	#8 (permalink)
KShirza1 Senior Member Join Date: Feb 2007 Location: ARIZONA Posts: 1,340 iTrader: 1 / 100%	that can cause the head grenade... that sort of contact is very common in a over rev situation and not just in k-series. ive done ot before. take off your valve cover and check you cams and rocker arm assembly. this seriouse, so get checked out.

03-08-2007, 05:20 PM	#9 (permalink)
kamikaze84 Senior Member Join Date: Jan 2007 Location: greenville, nc Posts: 258 Blaine iTrader: 0 / 0%	thats what a rev limiter is for.

03-08-2007, 05:52 PM	#12 (permalink)
rmfa Senior Member Join Date: Sep 2006 Location: Austin, TX Age: 27 Posts: 3,512 Ronnie iTrader: 2 / 100%	You would know immediately if you were going to have a problem.

03-08-2007, 10:05 PM	#13 (permalink)
SWiFTA06Si Junior Member Join Date: May 2006 Posts: 9 iTrader: 0 / 0%	ive had the same thing, and when i brought my car in for an oil change they noticed some dirty oil marks right underneath where the cam sensors are, the leak isnt noticable by watching it in idle but i cleaned it a few times and when i checked it there was more oil... Has anyone had to deal with this and figure out the problem....

03-08-2007, 10:20 PM	#14 (permalink)
fyreant Senior Member Join Date: Dec 2006 Location: EARTH Age: 26 Posts: 274 ANT iTrader: 0 / 0%	^^you shouldnt have to worry about it.. the dealership should......

03-09-2007, 12:05 AM	#15 (permalink)
radiocontrolhead Senior Member Join Date: Apr 2006 Location: Hollywood, ca Age: 21 Posts: 2,927 Danny iTrader: 0 / 0%	I must have read this same problem on here 4 times from different users. Search works wonders.

03-25-2007, 02:12 PM	#17 (permalink)
WOOCHOW Member Join Date: Oct 2006 Location: Norwich, CT Posts: 33 iTrader: 0 / 0%	you're fine. go right ahead and keep yapping on your stupid phone, loser