Improper cam install/Over-revv carnage - Page 6

Black Hole · 08-14-2018, 12:30 PM

Curious to know the status...

solobaric · 08-15-2018, 01:57 AM

Popcorn please!

S2K+1LE · 08-15-2018, 09:21 AM

Quote:

Originally Posted by DatBrotato

I'm having a gm tech come out to the car to try and pull the info off the blackbox/ecu.

Been 5 days, what happened?

Curr · 08-15-2018, 09:50 AM

If anything, this affirms that I'd have zero issues buying anything VR. Ron has shown amazing patience with this guy shoving the blame around to everyone but himself.

DatBrotato · 08-17-2018, 01:32 PM

I'll comment again once the shop gets around to my vehicle, whether or not the results are in my favor.
They've got a line of builds going on, car probably won't be done for at least a couple months(at best). My experience with full motor builds from any shop is that they're never done in a timely manner, and I don't expect any different here.

Tech wasn't able to get anything relevant off the ecu's memory since the battery has been disconnected/reconnected. Can't get blackbox info unless the car is brought into a dealer, and I won't be doing that until after the car is done.

oldman · 08-18-2018, 11:14 AM

I would assume only the dealer can pull engine status before check engine, things like rpm and vehicle speed, which gear the trans was in etc. Good luck, I think you are being realistic no car for a few months.

RUQWIKR · 08-18-2018, 09:37 PM

Missing a shift (neutral vs. downshifting in error) at those rpm's at WOT is still going to result in additional rpm rise due to inertia and in some added valve bounce off the seat.

Unless you have a cam / valve / valve spring combo that has been run on a Spintron to see how controlled the valvetrain is at a given rpm, you have no idea of how well controlled the valve events are and how much bounce is seen at different rpm's.

If already tight on piston-to-valve clearance, which, without degreeing the cam in is totally unknown, the results can easily be this with too high of an rpm.

Below is a good (old) article about testing for valvetrain stability, measuring valve bounce, etc. While it is on a LS7, the engineering behind it applies.

http://www.superchevy.com/how-to/140...xhaust-valves/

twoballscrewball · 08-20-2018, 01:12 PM

The amount of difference in pitch between the 'normal' shift points in the video, and the 'over rev' clearly sounds like it grabbed 2nd. The motor screams for a split second. If someone with audio software took the frequency of the exhaust at the shift points and assumed it's around 6500rpm, it should be fairly easy to get a rough estimate of the rpm immediately before the magic smoke came out of the exhaust. I'm thinking I'm hearing 8k easy.

But that's just my opinion.

twoballscrewball · 08-20-2018, 01:21 PM

Here's what 8000rpm sounds like, for reference.

I'd bet my lunch that was not a free rev.

RUQWIKR · 08-20-2018, 02:20 PM

If the car had PDR, was it on? I don’t remember that in the thread but easily could have missed it.

oldman · 08-20-2018, 03:46 PM

I think it is easier to "see" if you close your eyes and just listen to the RPM.. If I push in the clutch pedal, top of any gear, pedal to the metal my RPM hovers... there is no change in the engine voice,

https://photos.google.com/share/AF1Q...F6dzlPQ1FIZWFR

RUQWIKR · 08-20-2018, 05:52 PM

Quote:

Originally Posted by oldman

I think it is easier to "see" if you close your eyes and just listen to the RPM.. If I push in the clutch pedal, top of any gear, pedal to the metal my RPM hovers... there is no change in the engine voice,

https://photos.google.com/share/AF1Q...F6dzlPQ1FIZWFR

Not arguing how it sounds to me, either, just the PDR data (if available) would clear up the opinion vs. fact...

oldman · 08-20-2018, 06:17 PM

No argument here. Does the PDR always record? I don't have a 1LE, but wow maybe he could just get the PDR record. Heck it looks like he could just pull the chip and watch it on his laptop, assuming it was recording. Cool, wish I had a 1LE...

RUQWIKR · 08-20-2018, 07:00 PM

Quote:

Originally Posted by oldman

No argument here. Does the PDR always record? I don't have a 1LE, but wow maybe he could just get the PDR record. Heck it looks like he could just pull the chip and watch it on his laptop, assuming it was recording. Cool, wish I had a 1LE...

If he had the optional PDR, you have to activate it, but, it can be started while the car is in motion. In heavy traffic, I often keep mine running all the time as a dash cam in case I get hit or something on road happens. You just choose to not save / delete the given file at the end of the recording or anythime after.

08-15-2018, 01:57 AM	#72
solobaric Drives: 2002 Camaro SS Join Date: Jun 2012 Location: Evansville, Indiana Posts: 526	Popcorn please! __________________ 2017 1SS Hyper Blue M6 2001 Ford Lightning

08-15-2018, 09:50 AM	#74
Curr Probably doesn't like you Drives: 2022 WCT ZL1 M6 Join Date: Jun 2015 Location: Boston-ish Posts: 1,384	If anything, this affirms that I'd have zero issues buying anything VR. Ron has shown amazing patience with this guy shoving the blame around to everyone but himself. __________________ I hope the 6th gen Camaro has a melodious horn trumpet. I'll tootel it at the ladies, yelling out "Hi hi." - RenegadeXR كافر ΜΟΛΩΝ ΛΑΒΕ железобетонное очко Quod gratis asseritur, gratis negatur. There is an unequal amount of good and bad in most things, the trick is to work out the ratio and act accordingly.

08-17-2018, 01:32 PM	#75
DatBrotato Drives: '18 SS 1LE M6 Join Date: Feb 2018 Location: TX Posts: 117	I'll comment again once the shop gets around to my vehicle, whether or not the results are in my favor. They've got a line of builds going on, car probably won't be done for at least a couple months(at best). My experience with full motor builds from any shop is that they're never done in a timely manner, and I don't expect any different here. Tech wasn't able to get anything relevant off the ecu's memory since the battery has been disconnected/reconnected. Can't get blackbox info unless the car is brought into a dealer, and I won't be doing that until after the car is done. __________________ '18 1SS 1LE M6 NGM\|\| 11.5:1 Diamond Pistons \|\| Callie's H-beams \|\| Vengeance III Cam Kit \|\| Built Heads \|\| TSP LTs 1 7/8"(C-Coated) \|\| MSD IM \|\| DSX E85 \|\| Rotofab \|\| BMR Springs \|\| 576/472 @7000rpm

08-18-2018, 11:14 AM	#76
oldman Drives: SS 6 speed of course Join Date: Jan 2016 Location: Hilo, HI Posts: 4,346	I would assume only the dealer can pull engine status before check engine, things like rpm and vehicle speed, which gear the trans was in etc. Good luck, I think you are being realistic no car for a few months. __________________ Forged short block, large duration sub .600 lift Cam Motion cam, 7200 RPM fuel cut, Pray Ported Heads, 3.85 pulley D1X, stage II intercooler, DSX secondary low side, DSX E85 sensor, Lingenfelter big bore 2.0 pump, ported front cats, 60608 Borla, LT4 injectors, ZL1 1LE driveshaft and Katech ported TB, ported MSD intake, BTR valvetrain, ARP studs, ProFlow valves, PS4 tires.

08-20-2018, 01:12 PM	#78
twoballscrewball Drives: 89 Iroc Convertible, 2017 2SS Fifty Join Date: May 2018 Location: NJ Posts: 30	The amount of difference in pitch between the 'normal' shift points in the video, and the 'over rev' clearly sounds like it grabbed 2nd. The motor screams for a split second. If someone with audio software took the frequency of the exhaust at the shift points and assumed it's around 6500rpm, it should be fairly easy to get a rough estimate of the rpm immediately before the magic smoke came out of the exhaust. I'm thinking I'm hearing 8k easy. But that's just my opinion. Last edited by twoballscrewball; 08-20-2018 at 01:26 PM. Reason: typo

08-14-2018, 12:30 PM	#71
Black Hole Drives: 2017 2SS Redline Join Date: Mar 2018 Location: FL Posts: 34	Curious to know the status...

08-18-2018, 09:37 PM	#77
RUQWIKR Drives: 1LEs Join Date: May 2009 Location: DFW - Texas Posts: 1,327	Missing a shift (neutral vs. downshifting in error) at those rpm's at WOT is still going to result in additional rpm rise due to inertia and in some added valve bounce off the seat. Unless you have a cam / valve / valve spring combo that has been run on a Spintron to see how controlled the valvetrain is at a given rpm, you have no idea of how well controlled the valve events are and how much bounce is seen at different rpm's. If already tight on piston-to-valve clearance, which, without degreeing the cam in is totally unknown, the results can easily be this with too high of an rpm. Below is a good (old) article about testing for valvetrain stability, measuring valve bounce, etc. While it is on a LS7, the engineering behind it applies. http://www.superchevy.com/how-to/140...xhaust-valves/

08-20-2018, 02:20 PM	#80
RUQWIKR Drives: 1LEs Join Date: May 2009 Location: DFW - Texas Posts: 1,327	If the car had PDR, was it on? I don’t remember that in the thread but easily could have missed it.

08-20-2018, 03:46 PM	#81
oldman Drives: SS 6 speed of course Join Date: Jan 2016 Location: Hilo, HI Posts: 4,346	I think it is easier to "see" if you close your eyes and just listen to the RPM.. If I push in the clutch pedal, top of any gear, pedal to the metal my RPM hovers... there is no change in the engine voice, https://photos.google.com/share/AF1Q...F6dzlPQ1FIZWFR __________________ Forged short block, large duration sub .600 lift Cam Motion cam, 7200 RPM fuel cut, Pray Ported Heads, 3.85 pulley D1X, stage II intercooler, DSX secondary low side, DSX E85 sensor, Lingenfelter big bore 2.0 pump, ported front cats, 60608 Borla, LT4 injectors, ZL1 1LE driveshaft and Katech ported TB, ported MSD intake, BTR valvetrain, ARP studs, ProFlow valves, PS4 tires. Last edited by oldman; 08-20-2018 at 04:03 PM.

08-20-2018, 06:17 PM	#83
oldman Drives: SS 6 speed of course Join Date: Jan 2016 Location: Hilo, HI Posts: 4,346	No argument here. Does the PDR always record? I don't have a 1LE, but wow maybe he could just get the PDR record. Heck it looks like he could just pull the chip and watch it on his laptop, assuming it was recording. Cool, wish I had a 1LE... __________________ Forged short block, large duration sub .600 lift Cam Motion cam, 7200 RPM fuel cut, Pray Ported Heads, 3.85 pulley D1X, stage II intercooler, DSX secondary low side, DSX E85 sensor, Lingenfelter big bore 2.0 pump, ported front cats, 60608 Borla, LT4 injectors, ZL1 1LE driveshaft and Katech ported TB, ported MSD intake, BTR valvetrain, ARP studs, ProFlow valves, PS4 tires.

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