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06-05-2013
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#1 |
 Join Date: Nov 2007
Location: chicago
Posts: 200
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Valve train Puzzle
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06-05-2013
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#2 |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,696
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Re: Valve train Puzzle
So what gave way first? You should start a poll.
Chain Valve locks Cam bolt
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
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06-05-2013
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#3 |
 Join Date: Jan 2004
Location: Alex VA
Posts: 1,087
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Re: Valve train Puzzle
very sorry to see the damage. these types of failures are rare
on the u tube video you suspect valve float how high was the car revved??? can you describe what was happening when the failure occurred? important thing now is to get the beast back on the road. I just sold my stock takeout valves from the LPE LSV or I could help you out there. may still have the lifters, but they are available. doesn't look like the heads are hurt too bad, hows the short block?
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95 390 LPE ZR1 (505 rwhp) LSV = Lingenfelter Super Vette Twin Turbo 2003 Z06 (800 RWHP) |
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06-05-2013
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#4 | |
  
Join Date: Aug 2009
Location: South Dakota/California
Posts: 3,791
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Re: Valve train Puzzle
Quote:
What Happened???? |
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06-05-2013
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#5 |
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Join Date: Nov 2007
Location: chicago
Posts: 200
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Re: Valve train Puzzle
[QUOTE=rkreigh;175082]very sorry to see the damage. these types of failures are rare
on the u tube video you suspect valve float how high was the car revved??? can you describe what was happening when the failure occurred? important thing now is to get the beast back on the road. I just sold my stock takeout valves from the LPE LSV or I could help you out there. may still have the lifters, but they are available. doesn't look like the heads are hurt too bad, hows the short block?[/QUOT ] The cylinder head and lifters I located already the rest of the Parts are coming from Pete. as far as what happend to the motor that moment,I was in staging warming up the tires motor reved up to 7500 RPM and one second later it grenaded. Al. |
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06-05-2013
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#6 |
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Join Date: Jan 2004
Location: Alex VA
Posts: 1,087
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Re: Valve train Puzzle
7500 shouldn't be enough to float the valves
been there, done that, a whole bunch of times  my bet is that a chain broke sounds like you are in good hands and well on the way to getting it back together. time for some MODS while it's apart if they haven't been done already
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95 390 LPE ZR1 (505 rwhp) LSV = Lingenfelter Super Vette Twin Turbo 2003 Z06 (800 RWHP) |
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06-05-2013
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#7 | |
Join Date: Apr 2007
Location: Lake Bluff, IL
Posts: 2,058
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Re: Valve train Puzzle
Quote:
It was great to see you Sunday but very sorry the engine gave up. Looks pretty bad in the video. Hope you can get it back together soon. Its a puzzle. Maybe valve float at that high (7500) rpm. Looks like something stoped the cams. Anyway, good luck on the rebuild!---Bob
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2016 Long Beach Red Z06 #10281 "POPS Z" 1995 Polo Green #409 "WARP TEN"--Haibeck 350/510 package, 4.10s, Hurst, Stock Exhaust with QTP Cutouts --Sold but still running strong 1993 Quasar Blue #161 "HIL KING" --Sold but still running strong, now with more than 120,000 miles 1967 Marlboro Maroon/Saddle Corvette Coupe 300 hp/4-spd --Sold a long time ago ZR-1 Net Registry Founding Member #95 NCM Lifetime Member Favorite Quote--Attributed to Mickey Thompson: "Too Much Horsepower is Almost Enough" |
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06-05-2013
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#8 |
   
Join Date: May 2007
Location: Peoria, AZ
Posts: 9,154
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Re: Valve train Puzzle
Im wondering if the Cam bolt sheared however the thinning lifter is also a concern. That happens over time not during a catastropic event.
Last time I saw a blow through on a cam cover it was a cam retention bolt failure.
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GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director  91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V |
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06-05-2013
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#9 |
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Join Date: Dec 2012
Location: Columbus, OH
Posts: 73
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Re: Valve train Puzzle
Sorry to see this happen your engine, hope you are up and running soon. When you flipped the cam cover over, it resembled damage that automotive author Hib Halverson had to his ’95 LT5. I recall seeing a photo of his cam cover with a hole very similar to your cam cover. His engine was running at high RPM as well. http://www.vetteweb.com/tech/vemp_00...s/viewall.html
What kind of mileage do you have on your engine? B17 Crew 
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06-05-2013
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#10 |
Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: Valve train Puzzle
The line manager at Mercury told me many of the race engines they tested broke cam chains related to oil starvation on the lower half of the motor at high RPM. He said people always think the chains are the weak point but its the oiling system pushing all of the oil to the top end of the motor; sudden stoppage snaps the chains.
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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