Mechanical overrev

Jonnydz · 10-28-2019, 02:20 PM

Hi guys had a track day a few days ago and hit 2nd instead of 4th. I know stupid. Anyways it was caught on my pdr. I backed off as soon as I realized it which was really quick. It was my last session and the final lap of course. Drove it 2 hrs back home and didn't notice anything. Think I'm ok?

eimarshall · 10-28-2019, 02:30 PM

90 in second gear should be about 7400rpm based on quick math and stock tire diameter. That doesn't sound too bad to me.

If it doesn't seem down on power and isn't making any scary noises, you're probably ok. Maybe change the oil and check the filter for any bits.

CrazyCatGuy · 10-28-2019, 02:41 PM

If you caught it right away I'd venture to say you're fine. I've done it a few times over the years and caught them right away; not once did I have any engine issues for any of those cars.

No ticking/tapping coming from the engine afterwards right?

Jaxcam02 · 10-28-2019, 03:26 PM

Id bet that your fine. I've done it a few times in my going on 18 year old LS1 and its never had a problem.

Tim M · 10-28-2019, 03:27 PM

Most believe over-rev damage is incremental. Likely valve springs are most impacted - lose pressure once exceed their design limits.

Obviously, if it didn't scatter - no issue, but don't think anyone can guarantee long term health...then again, a production engine is pretty robust - few LT1's seem to be have been lost.

NeverDie · 10-28-2019, 03:45 PM

If it's burning a lot of oil in the next 1000 miles or so you'll probably be rebuilding the head.

Not every issue makes itself evident immediately.

RUQWIKR · 10-28-2019, 05:48 PM

Remember, you can do the same by downshifting to the correct gear but letting the clutch out too early. Active rev match won't save you on that either. I see it all the time in PDR videos. As mentioned, you may not drop a valve right away, but, you're poking the hornet's nest a little at a time.

Tango1LE · 10-28-2019, 06:12 PM

Jonny, I wouldn't worry too much... Red line is 6500RPM and it looks like you went just 500 above for a bit.. As others said, it did not grenade itself right then and there.. get an oil change and it should be good for 17 Nov Sebring!

TrackClub · 10-28-2019, 06:27 PM

Id swap out the springs, as a proactive measure.

Jonnydz · 10-28-2019, 07:24 PM

Thanks for all the info. Engine is running fine with no lose of power, smoke, or ticking. I am going to change the oil this weekend. Tango I am a no go for the 17th. Going out to auto club speedway (cally) for a hpde in a c7 grandsport. Cant wait to compare to our car. Hopefully Jan we can meet up again

Gunkk · 10-28-2019, 08:03 PM

Send a sample to blackstone and tell them you money shifted it. If there is metal in the oil, they’ll tell you.

Stephen12ZL1 · 10-28-2019, 09:23 PM

Keep driving it, you are fine. I wouldn't worry about it for second unless you have heard something different.

TrackClub · 10-29-2019, 12:04 AM

Just some food for thought: you could be fine, or some parts, springs especially, could have gotten fatigued.
Nobody can tell you one way or another, not even if they are a Grand Master Mechanic, or a BB poster

The fact you dont hear anything is a sign nothing broke immediately, but not that something wont break next time you reach red line, if it has weakened. Metal fatigue is not a binary type of proposition a la: it works today so it will work just fine tomorrow. I know semi pro circle track guys who change springs for every race, as a cheap insurance. Usually, 4th to 2nd will grenade a motor in an instant, but perhaps your shift was a lazy one, allowing rpms to drop quite a bit. Regardless,
I wouldn't say you're risk free longer term. My 2 cents.
Then again, you are covered by GM power train warranty, so there is that

Cheers!

SJFGTO · 10-29-2019, 04:50 AM

Quote:

Originally Posted by Gunkk

Send a sample to blackstone and tell them you money shifted it. If there is metal in the oil, they’ll tell you.

^^^This. Easy to do. Peace of mind is worth the minimal effort.

10-28-2019, 02:20 PM	#1
Jonnydz Drives: 2017 1ss 1le Join Date: Feb 2018 Location: Merritt island Posts: 118	Mechanical overrev Hi guys had a track day a few days ago and hit 2nd instead of 4th. I know stupid. Anyways it was caught on my pdr. I backed off as soon as I realized it which was really quick. It was my last session and the final lap of course. Drove it 2 hrs back home and didn't notice anything. Think I'm ok? Attached Images __________________

10-28-2019, 02:41 PM	#3
CrazyCatGuy I'm the cats pajamas baby Drives: 2018 Camaro SS 1LE Join Date: Oct 2018 Location: East Bay Area Posts: 150	If you caught it right away I'd venture to say you're fine. I've done it a few times over the years and caught them right away; not once did I have any engine issues for any of those cars. No ticking/tapping coming from the engine afterwards right? __________________

10-28-2019, 03:26 PM	#4
Jaxcam02 Drives: 2017 Silverado/2017 ZL1 Join Date: Aug 2019 Location: Jax/Palatka FL Posts: 1,090	Id bet that your fine. I've done it a few times in my going on 18 year old LS1 and its never had a problem. __________________

10-28-2019, 03:27 PM	#5
Tim M Drives: 2018 Camaro SS 1LE Join Date: Jul 2018 Location: Stuttgart, Germany Posts: 807	Most believe over-rev damage is incremental. Likely valve springs are most impacted - lose pressure once exceed their design limits. Obviously, if it didn't scatter - no issue, but don't think anyone can guarantee long term health...then again, a production engine is pretty robust - few LT1's seem to be have been lost. __________________ 2018 SS 1LE German Based Nurburgring Visit #19 Ring Laps: 77

10-28-2019, 06:12 PM	#8
Tango1LE Drives: 2018 1SS 1LE Join Date: Dec 2017 Location: Palm Coast, Fla Posts: 86	Jonny, I wouldn't worry too much... Red line is 6500RPM and it looks like you went just 500 above for a bit.. As others said, it did not grenade itself right then and there.. get an oil change and it should be good for 17 Nov Sebring! __________________ Tango Charlie '18 1SS 1LE '68 SS LS2 '89 RS 'vert

10-28-2019, 02:30 PM	#2
eimarshall Drives: 2018 SS 1LE Hyperblue Join Date: Jul 2017 Location: Lacey, WA Posts: 346	90 in second gear should be about 7400rpm based on quick math and stock tire diameter. That doesn't sound too bad to me. If it doesn't seem down on power and isn't making any scary noises, you're probably ok. Maybe change the oil and check the filter for any bits.

10-28-2019, 03:45 PM	#6
NeverDie Account Suspended Drives: 2017 Camaro SS 1LE Join Date: Oct 2018 Location: AZ Posts: 429	If it's burning a lot of oil in the next 1000 miles or so you'll probably be rebuilding the head. Not every issue makes itself evident immediately.

10-28-2019, 05:48 PM	#7
RUQWIKR Drives: 1LEs Join Date: May 2009 Location: DFW - Texas Posts: 1,319	Remember, you can do the same by downshifting to the correct gear but letting the clutch out too early. Active rev match won't save you on that either. I see it all the time in PDR videos. As mentioned, you may not drop a valve right away, but, you're poking the hornet's nest a little at a time.

10-28-2019, 06:27 PM	#9
TrackClub Drives: 2020 SS 1LE (previous: 2017 SS 1LE) Join Date: Mar 2012 Location: Canada, eh! Posts: 5,091	Id swap out the springs, as a proactive measure.

10-28-2019, 07:24 PM	#10
Jonnydz Drives: 2017 1ss 1le Join Date: Feb 2018 Location: Merritt island Posts: 118	Thanks for all the info. Engine is running fine with no lose of power, smoke, or ticking. I am going to change the oil this weekend. Tango I am a no go for the 17th. Going out to auto club speedway (cally) for a hpde in a c7 grandsport. Cant wait to compare to our car. Hopefully Jan we can meet up again __________________

10-28-2019, 08:03 PM	#11
Gunkk Thank you Al Oppenheiser! Drives: Red Hot A10 ZL1 Convertible Join Date: Jun 2017 Location: Sarasota, FL Posts: 4,973 View My Garage	Send a sample to blackstone and tell them you money shifted it. If there is metal in the oil, they’ll tell you.

10-28-2019, 09:23 PM	#12
Stephen12ZL1 Drives: '21 ZLE A10 Join Date: May 2012 Location: Mechanicsville, VA Posts: 6,808	Keep driving it, you are fine. I wouldn't worry about it for second unless you have heard something different. __________________ '21 ZLE A10 Wild Cherry PDR 2:00.78 VIR Full 10.68@131.69 1.68 60' '17 ZL1 A10 Mosaic Black PDR/Nav 2:03.08 VIR Full 11.003@129.2 1.75 (sold) '15 Z/28 #325 Black a/c & stereo. 2:10.1 VIR Full (sold) '12 ZL1 A6 Black 10.52@131 1.55 60' 2:13 VIR Full (sold)

10-29-2019, 12:04 AM	#13
TrackClub Drives: 2020 SS 1LE (previous: 2017 SS 1LE) Join Date: Mar 2012 Location: Canada, eh! Posts: 5,091	Just some food for thought: you could be fine, or some parts, springs especially, could have gotten fatigued. Nobody can tell you one way or another, not even if they are a Grand Master Mechanic, or a BB poster The fact you dont hear anything is a sign nothing broke immediately, but not that something wont break next time you reach red line, if it has weakened. Metal fatigue is not a binary type of proposition a la: it works today so it will work just fine tomorrow. I know semi pro circle track guys who change springs for every race, as a cheap insurance. Usually, 4th to 2nd will grenade a motor in an instant, but perhaps your shift was a lazy one, allowing rpms to drop quite a bit. Regardless, I wouldn't say you're risk free longer term. My 2 cents. Then again, you are covered by GM power train warranty, so there is that Cheers!

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