Zilla's initial autopsy: - Page 4 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


General GM Chat When starting new posts, please specify YEAR, MAKE, MODEL, ENGINE type, and whatever modifications you have made. Chat about all things GM (and related cars). Off-topic stuff should be in the Lounge, and all Model specific mechanical problems should be posted in the proper forum.

Reply
 
 
 
Thread Tools Search this Thread
Old 09-03-2007, 04:45 PM   #31
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

That'* the price we all risk paying when we mod.

There may be more truth to the gas station putting 87 octane in there than I thought. I'll have to play it careful when I start it up again. I may increase pulley diameter for safety in the meantime.

Good thing I had that rather monstrous 2.3" on there when it happened. It could've been much worse.

I've done some local searching (NW area) and have found a couple good candidates for replacement. It may be in the budget within a couple weeks.

This engine will be kept for rebuild for a rainy day.
willwren is offline   Reply With Quote
Old 09-03-2007, 10:17 PM   #32
Senior Member
Posts like a Supercharger
 
Join Date: May 2003
Location: Columbus, OH
Posts: 163
Thanks: 0
Thanked 0 Times in 0 Posts
13secGTP is on a distinguished road
Default

Quote:
thats strange that it bent the ground electrode like that, and didn't even break the ceramic.
Its actually very common the bend the electrode like that when you chip a piston. I chipped 4 at IDD in 06 and still ran a 13.0-change the plugs-tune and go-lol.

However from the pics it doesn't look like a chipped piston, it looks more like it was tapped by the piston. I agree with the compression results showing a chipped piston.
13secGTP is offline   Reply With Quote
Old 09-04-2007, 06:31 AM   #33
Senior Member
True Car Nut
 
Join Date: Jul 2004
Location: Twin Falls, Idaho
Posts: 7,545
Thanks: 0
Thanked 1 Time in 1 Post
Hans is on a distinguished road
Default

I'm also curious as to what happened. I dont see how the 2.3 and low octane would kill it. I'm still trying to picture in my head how the piston would do that to the plug.
Hans is offline   Reply With Quote
Old 09-04-2007, 08:16 AM   #34
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

It'* not actually the piston Hans..is a chip from the piston. Small enough piece to impact without destruction.

Chipping pistons is actually pretty common in our motors once you step things up to certain levels.
BillBoost37 is offline   Reply With Quote
Old 09-04-2007, 09:10 AM   #35
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

Hans, I'm running a 2.3" pulley on a GEN3 setup. Think about it. And if 87 octane actually did go in the car that night like I suspect, a chipped piston is definitely on the menu.
willwren is offline   Reply With Quote
Old 09-04-2007, 09:33 AM   #36
Senior Member
True Car Nut
 
Join Date: Mar 2006
Location: Virginia
Posts: 2,904
Thanks: 0
Thanked 0 Times in 0 Posts
93-SSE is on a distinguished road
Default

Quote:
Originally Posted by willwren
Hans, I'm running a 2.3" pulley on a GEN3 setup. Think about it. And if 87 octane actually did go in the car that night like I suspect, a chipped piston is definitely on the menu.
Anyway you can check the fuel thats in the car now?

Well like i said before, i believe it was the 'night from hell thread', that sucks but its fun going through it. Have fun with the repairs, hopefully it may not be quite as bad as you think. And have fun with your upcoming mod...whatever the heck it is
93-SSE is offline   Reply With Quote
Old 09-04-2007, 01:34 PM   #37
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

Found a good replacement candidate with better compression than my GOOD cylinders, which are well above minimum spec (even the 'bad' cylinder is still good, but not good for making power).

Also just checked out a little toy from the tool shack here at HP. Fiberoptic borescope with a built-in light and articulating end. It also comes with a 90 little mirror for looking straight up or down. With this, I'll be able to fully inspect the entire cylinder bore, piston, head, and valves from the inside.

Here'* a vid of the gizmo in action:


And some images from it. Focus is an effort when holding the borescope AND camera, but clarity is amazing using my eyes.

Precision ruler graduated in 10th'* and 100th'* of an inch:
Name:  DSC04790.jpg
Views: 2
Size:  9.1 KB

Name:  DSC04792.jpg
Views: 1
Size:  9.3 KB

Name:  DSC04794.jpg
Views: 2
Size:  14.4 KB

Name:  DSC04795.jpg
Views: 2
Size:  54.8 KB
willwren is offline   Reply With Quote
Old 09-04-2007, 01:55 PM   #38
Senior Member
True Car Nut
 
Join Date: Oct 2005
Location: Central Florida
Posts: 7,030
Thanks: 0
Thanked 0 Times in 0 Posts
lash is on a distinguished road
Default

Certainly not something you normally want to see happen. But like you said, these things can happen when you start pushing things beyond a certain point.

I must say that you seem to be takinng it remarkably well.
lash is offline   Reply With Quote
Old 09-04-2007, 02:06 PM   #39
Junior Member
 
Join Date: Mar 2004
Location: Purgatory
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
harofreak00 is on a distinguished road
Default

Fiberoptic borescope = Cooler than Zilla
harofreak00 is offline   Reply With Quote
Old 09-04-2007, 02:08 PM   #40
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

Nice boroscope. It'* awesome the way you can check tools out to have the ability to know what is going on inside the cylinder.

It is sad to see the motor go at such a low mileage. Like you said though..the new compression on the motor you are looking at should be great for making power.
BillBoost37 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Autopsy: Postmorten w/ Dr. Michael 01bonne Lounge 3 01-23-2008 11:35 AM
The initial plan... Canius Performance, Brainstorming & Tuning 29 12-16-2005 08:23 PM
Zilla trans autopsy photos willwren 1992-1999 20 09-30-2005 11:24 AM
Transmission Autopsy! Finally ;) --->NOW WITH PICTURE< willwren General GM Chat 58 02-23-2005 02:52 AM
Initial D Merlin 91/97 Lounge 4 07-06-2004 02:13 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 03:52 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.