Improper cam install/Over-revv carnage - Page 2

laynlo15 · 08-05-2018, 06:33 AM

That head doesn't appear to be salvageable to me. I'd order a new head.

zr1chris · 08-05-2018, 07:08 AM

Watching the video very closely it's hard to tell but I think I see a hint of smoke out of the exhaust just before missing the gear, then of course once you missed 4th on came the smoke show. I'm thinking it was on it's way out already and missing 4th just finished the job.

Camaro_QC · 08-05-2018, 08:17 AM

Quote:

Originally Posted by Vtor_ZL1

Another winner.. courtesy of street racing.

Exactly what I was thinking. He got what he deserved...

Street racing is bad.

Gunkk · 08-05-2018, 08:48 AM

The 2-3 shift is clearly a no-lift-shift. So is the next one. Very high pitch under throttle for a split second ... that's a no lift shift from 3rd to 2nd causing mechanical over-rev.

Street racing notwithstanding, IMO the OP can't blame anyone but himself.

DatBrotato · 08-05-2018, 07:20 PM

Quote:

Originally Posted by Gunkk

The 2-3 shift is clearly a no-lift-shift. So is the next one. Very high pitch under throttle for a split second ... that's a no lift shift from 3rd to 2nd causing mechanical over-rev.

Street racing notwithstanding, IMO the OP can't blame anyone but himself.

Clearly you haven't seen a 3-2 shift. It never went into 2nd and I most definitely didn't let out the clutch
It didn't see a gear after 3rd.

The shop owner, mechanics, tuner, and vengeance has seen the video. They all agreed it was a free revv.

DatBrotato · 08-05-2018, 07:41 PM

Quote:

Originally Posted by zr1chris

Watching the video very closely it's hard to tell but I think I see a hint of smoke out of the exhaust just before missing the gear, then of course once you missed 4th on came the smoke show. I'm thinking it was on it's way out already and missing 4th just finished the job.

Good eye, I didn't catch the smoke in 3rd

jdasnt3 · 08-06-2018, 06:55 AM

Curious, but what shop did the work?

ZNix · 08-06-2018, 07:06 AM

Quote:

Originally Posted by Camaro_QC

Exactly what I was thinking. He got what he deserved...

Street racing is bad.

Nobody deserves a broken motor.

You're a turd, get out of here with that.

GL OP. Hope you can get everything fixed. Ill have to give the vid a watch after work.

DFW1LE · 08-06-2018, 07:53 AM

Quote:

Originally Posted by oldman

yep all indication would be a phaser problem, either it fell apart, or they forgot the limiter / lockout, Vengence sells a lockout setup.

As Oldman and others mentioned, the cam phase limiter or lack thereof might have caused the problem assuming the tune was good, however, I would also note that some of these stage 3 cams offered by various companies may require fly-cutting the pistons for clearance, thus the need to check PTV.

DatBrotato · 08-06-2018, 08:54 AM

Quote:

Originally Posted by jdasnt3

Curious, but what shop did the work?

Speedtek in Fort Worth.

Quote:

Originally Posted by DFW1LE

As Oldman and others mentioned, the cam phase limiter or lack thereof might have caused the problem assuming the tune was good, however, I would also note that some of these stage 3 cams offered by various companies may require fly-cutting the pistons for clearance, thus the need to check PTV.

I'll follow up with the shop and see what they did with the phase limiter.
I spoke with vengeance twice and they didn't mention a flycut. They did however warn to not run thinner gaskets or mill the head with this cam, which means it was right on the bleeding edge of needing a flycut

62nalide · 08-06-2018, 09:06 AM

Damn, who spec'd the cam? .660'' on the exhaust?

TJay74 · 08-06-2018, 01:39 PM

Quote:

Originally Posted by KingLT1

These engines don't have a rev limiter like the older stuff. The throttle just closes so you don't bounce off anything...much easier on the engine that way. It was bouncing because something was mechanically wrong (obviously).

Based on what I have seen in the OEM tune there is a rev limited in the programming. It isnt all just throttle based.

DatBrotato · 08-06-2018, 02:08 PM

Quote:

Originally Posted by 62nalide

Damn, who spec'd the cam? .660'' on the exhaust?

It made really good numbers on the Dyno, so no complaints there.
Exhaust valve was the one that got tagged/broke off. Wonder if there's a correlation

KingLT1 · 08-06-2018, 03:30 PM

Quote:

Originally Posted by TJay74

Based on what I have seen in the OEM tune there is a rev limited in the programming. It isnt all just throttle based.

Yea its spark and throttle based... My point was on these engines the limiter does not act the same. I can be wot on the limiter and the rpm doesn't bounce like a older LS engine does.

08-05-2018, 06:33 AM	#15
laynlo15 Drives: 2022 Lt1 A10 Join Date: Nov 2015 Location: clark, mo Posts: 8,860	That head doesn't appear to be salvageable to me. I'd order a new head. __________________ 2022 Lt1 6.2 A10, Maggie 2300, THPSI Port Inj/10 rib, Rotofab, E, Nickey, SCOL, Griptech, RC Bandits, Hoosiers/MT 9.80@142.96 1.44 60ft, 6.34@112 707/669 RWHP/TRQ. 16SS Maggie 2650 9.41@147 1.35 60ft, 5.99@119. 16 C7 A8 10.90@128 Bolt on stuff

08-06-2018, 06:55 AM	#21
jdasnt3 Drives: 18 Silverado 1500 Join Date: Dec 2015 Location: Bradenton, FL Posts: 1,721	Curious, but what shop did the work? __________________ 16 Red Hot 2SS A8: NPP, CAI Cold air, Ported TB, Fasterproms Ported intake, E85 flex, Formatto tuned. 11.80@118 with 1.92 60' (600-700 DA) on stock run flats.

08-06-2018, 09:06 AM	#25
62nalide Drives: 2013 SS Join Date: May 2013 Location: DFW Posts: 4,102	Damn, who spec'd the cam? .660'' on the exhaust? __________________ https://frankensteined.net/ Martin@Frankensteined.net

08-05-2018, 07:08 AM	#16
zr1chris Drives: 2018 Camaro 1SS/1LE Join Date: Feb 2015 Location: Port Saint Lucie FL Posts: 1,224	Watching the video very closely it's hard to tell but I think I see a hint of smoke out of the exhaust just before missing the gear, then of course once you missed 4th on came the smoke show. I'm thinking it was on it's way out already and missing 4th just finished the job.

08-05-2018, 08:48 AM	#18
Gunkk Thank you Al Oppenheiser! Drives: Red Hot A10 ZL1 Convertible Join Date: Jun 2017 Location: Sarasota, FL Posts: 4,975 View My Garage	The 2-3 shift is clearly a no-lift-shift. So is the next one. Very high pitch under throttle for a split second ... that's a no lift shift from 3rd to 2nd causing mechanical over-rev. Street racing notwithstanding, IMO the OP can't blame anyone but himself.

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