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10-10-2011
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#411 |
 
Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: LT5 Assembly Project
Big setback, did and leakdown test and none of the valves hold pressure....all 8 cylinders failed, bigtime.....more to come.
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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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10-11-2011
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#412 |
Join Date: Oct 2004
Location: Folsom CA
Posts: 1,654
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Re: LT5 Assembly Project
Didn't one of the FBI members run into similar issue about a year or so ago when the valves were a smidge too long after a valve job?
Gotta go do a search..... BRB Here it is: http://www.zr1.net/forum/showpost.ph...0&postcount=25 Possibility? TomC 'Crabs
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TomC '90ZR1 #792 Honorary Pirate [B]If it ain't FUN, you're doing something terribly WRONG. [/B] Last edited by tccrab; 10-11-2011 at 02:06 AM. |
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10-11-2011
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#413 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: LT5 Assembly Project
Engine was tested with cams......
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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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10-12-2011
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#414 |
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Join Date: Oct 2004
Location: Folsom CA
Posts: 1,654
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Re: LT5 Assembly Project
Lee:
Didn't read through enough to see if you used new rings, but if you did then they're probably just not seated into the cylinder walls yet. Perform standard engine break-in routine and then retest. HTH!!! TomC 'Crabs
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TomC '90ZR1 #792 Honorary Pirate [B]If it ain't FUN, you're doing something terribly WRONG. [/B] |
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10-12-2011
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#415 |
 Join Date: Dec 2005
Location: Huntley IL
Posts: 170
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Re: LT5 Assembly Project
Lee do you wan't to stop buy and check it out for you?
MR 134+ |
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10-12-2011
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#416 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: LT5 Assembly Project
Bob I am about 100% sure its a bad valve job......I am home today if you want to stop by......I pulled the D/S head and no marks on pistons, etc so appears nothing that I did....
Will be back home at 4:30 or so
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 Last edited by LGAFF; 10-12-2011 at 05:16 PM. |
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10-12-2011
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#417 | |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,708
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Re: LT5 Assembly Project
Quote:
I didn't believe it when you said it, but you are even more insufferable at 134+mph than you were at 128!!!  
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10-13-2011
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#418 |
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Join Date: Dec 2005
Location: Huntley IL
Posts: 170
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Re: LT5 Assembly Project
Don't You Just Love It
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10-13-2011
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#419 | |
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Join Date: Oct 2004
Location: Folsom CA
Posts: 1,654
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Re: LT5 Assembly Project
Quote:
If you didn't do the valve job, then the million dollar question is who did the valve job and how on earth did they fubar it so bad? One or two I could understand, but to goof up at least 1 valve on each cylinder seems highly unlikely. TomC 'Crabs
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TomC '90ZR1 #792 Honorary Pirate [B]If it ain't FUN, you're doing something terribly WRONG. [/B] |
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10-13-2011
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#420 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: LT5 Assembly Project
Very experienced shop, not sure what the story is at this time, will withhold any judgements until the verdict is in....lets not forget that these heads had a prior valve job and ate a screw.....so there could be alot of issues. I assembled the heads, etc....so maybe its something I did...
Maybe there is not even a problem...... But here is the main reason I am concerned.....this is at 45PSI  Exhaust valves: 
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 Last edited by LGAFF; 10-13-2011 at 10:05 PM. |
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Linear Mode
