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Author
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Topic: Today's lesson...ring end gaps!
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JohnB
Tech Moderator
Member # 969
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posted
 
 
Check your ring end gaps! It's not good for the piston...
And this was one of two...
[ October 22, 2006, 08:04 PM: Message edited by: JohnB ]
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1965 Shelby Cobra
1993 Cobra
2012 F150 Raptor
2020 GT500
Posts: 6523 | From: Orlando FL/Redding CA | Registered: Mar 2002
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two-gun kid2
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Member # 5891
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posted
nothing a litle super glue cant fix.
Posts: 5566 | From: Hayward,Ca | Registered: Jul 2005
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AJBlackGT
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Member # 3936
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posted
At least it looks like you got it shut down before the ring land tore anything up too much ![[Smile]](smile.gif)
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90 Notch
Posts: 1896 | From: Sacramento | Registered: Dec 2003
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Motorhead6T5
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Member # 4969
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posted
quote:
Originally posted by two-gun kid:
nothing a litle super glue cant fix.
JB weld idiot ![[Roll Eyes]](rolleyes.gif)
![[Razz]](tongue.gif)
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65 Fastback
72 Malibu
Posts: 1230 | From: 530 | Registered: Oct 2004
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JohnB
Tech Moderator
Member # 969
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posted
The best part was the pieces were missing! ![[Eek!]](eek.gif)
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1965 Shelby Cobra
1993 Cobra
2012 F150 Raptor
2020 GT500
Posts: 6523 | From: Orlando FL/Redding CA | Registered: Mar 2002
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gercolla1
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Member # 3068
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posted
I have a question instructor...How does all that happen? Seriously. ![[patriot]](graemlins/patriot.gif)
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Sf Bay Area
Posts: 2171 | From: Sampan San Francisco | Registered: Jul 2003
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Yellow94GT
Mr. 60 FT
Member # 431
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posted
quote:
Originally posted by JohnB:
Check your ring end gaps! It's not good for the piston...
Duh ![[Wink]](wink.gif)
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AED
1994 GT Bucket that will likely never run
1999 SLOLEEN Twin Turbo Coyote
2008 F250 580 RWHP 1129 RWTQ
Posts: 5990 | From: Cameron Park, Ca | Registered: Sep 2001
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JohnB
Tech Moderator
Member # 969
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posted
When people assemble engines rather than building them, this happens. They don't bother checking the gap in the ring. You cannot just "throw rings on pistons and stuff them in the holes"...or you'll get this. The ring needs a certain amount of clearance to ensure it all has room to "grow" when it gets hot. The engine was is a Autocross car. It sees alot of high rpms and even more heat than a straight line car.
I'm curious as to how many of the other 6 are fractured. ![[Cool]](cool.gif)
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1965 Shelby Cobra
1993 Cobra
2012 F150 Raptor
2020 GT500
Posts: 6523 | From: Orlando FL/Redding CA | Registered: Mar 2002
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BlowN67
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Member # 4229
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posted
wouldnt happen to be a probe/chp piston would it?
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AIM gonein67 JOHN
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Posts: 9809 | From: Home of LARD | Registered: Mar 2004
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andyman_2k01
CAFords OG
Member # 1448
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posted
when i built my motor, i remember dealing with those damn rings. they break fairly easy, and using the piston ring grinder was time consuming. the first one we inserted ended up gouging the cylinder wall and we had to get it resleeved. tons of fun.
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-00 Mustang GT (R Clone)
-99 Saleen Convert. #231-SOLD
Posts: 1503 | From: Bay Area, CA | Registered: Jun 2002
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two-gun kid2
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Member # 5891
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posted
quote:
Originally posted by Motorhead6T5:
quote:
Originally posted by two-gun kid:
nothing a litle super glue cant fix.
JB weld idiot
naw that takes to long to dry and can get messy.
Posts: 5566 | From: Hayward,Ca | Registered: Jul 2005
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Fostang
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Member # 3752
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posted
My question if it's due the lack of ring gap why is it that it's not broken where the ring gap joins and the ring stepped ends on each other?
I had a similar problem on an engine that I worked on not too long ago. Exact same breakage. Turn out to be a faulty fuel system along with too much timing.
[ October 23, 2006, 06:06 PM: Message edited by: Fostang ]
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67' Fastback TT 408
67' Camaro Lsx
64' Corvette Fuelie
57' Chevy Bel Air Lsx
68’ Pony Convertible
66’ Pony Coupe
Posts: 3011 | From: Stockton/Danville | Registered: Nov 2003
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JohnB
Tech Moderator
Member # 969
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posted
The piston will break here due to it being the thinnest area of the piston (because of the flycut). I'd agree and say it's a tune issue if there was obvious detonation...but as you an see from the pics, it was running pretty fat...and the 30lb inj's/whimpy cam combo was no help.
I feel really bad for the owner, as this engine has been nothing but a problem from day one. It's a nice centerpiece in the garage now! ![[Big Grin]](biggrin.gif)
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1965 Shelby Cobra
1993 Cobra
2012 F150 Raptor
2020 GT500
Posts: 6523 | From: Orlando FL/Redding CA | Registered: Mar 2002
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Fostang
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Member # 3752
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posted
I would like to know how much ring gap the rings had once it's pulled apart.
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67' Fastback TT 408
67' Camaro Lsx
64' Corvette Fuelie
57' Chevy Bel Air Lsx
68’ Pony Convertible
66’ Pony Coupe
Posts: 3011 | From: Stockton/Danville | Registered: Nov 2003
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JohnB
Tech Moderator
Member # 969
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posted
Sal, I'll post it up by Friday.
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1965 Shelby Cobra
1993 Cobra
2012 F150 Raptor
2020 GT500
Posts: 6523 | From: Orlando FL/Redding CA | Registered: Mar 2002
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Fostang
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Member # 3752
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posted
woo hooo.
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67' Fastback TT 408
67' Camaro Lsx
64' Corvette Fuelie
57' Chevy Bel Air Lsx
68’ Pony Convertible
66’ Pony Coupe
Posts: 3011 | From: Stockton/Danville | Registered: Nov 2003
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JohnB
Tech Moderator
Member # 969
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posted
Got a bad feeling it was assembled wrong as well?
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1965 Shelby Cobra
1993 Cobra
2012 F150 Raptor
2020 GT500
Posts: 6523 | From: Orlando FL/Redding CA | Registered: Mar 2002
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Fostang
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Member # 3752
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posted
Thats what I'm thinking
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67' Fastback TT 408
67' Camaro Lsx
64' Corvette Fuelie
57' Chevy Bel Air Lsx
68’ Pony Convertible
66’ Pony Coupe
Posts: 3011 | From: Stockton/Danville | Registered: Nov 2003
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BlowN67
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Member # 4229
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posted
quote:
Originally posted by Fostang:
Thats what I'm thinking
Hey SAL thats looks fimilar huh. lol
Thats a weeknd ender ![[Frown]](frown.gif)
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AIM gonein67 JOHN
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Posts: 9809 | From: Home of LARD | Registered: Mar 2004
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truthseeker
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Member # 4636
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posted
On my 98 Cobra, when I took the engine apart little pieces of the ring fell out.
When I looked at the piston I saw a piece was missing, but I could not find it. I think it went out the exhaust valve because there was no metal in the oil and the cylinder wall was not scratched one bit. Here is a picture of the piston and ring
Here is the #7 cylinder that failed, hard to tell in the picture, but it was smooth as a babies bottom
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1998 SVT Cobra Convertible | VT Cobra Billet Shortblock | T56 Tranny with Viper 5th and 6th | #3425 of 3480 | 17x9 + 17x11 CCW Classic's | 4.10 gears
Posts: 226 | From: Elk Grove, CA | Registered: Jun 2004
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Becca
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Member # 7004
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posted
quote:
Originally posted by JohnB:
I feel really bad for the owner, as this engine has been nothing but a problem from day one. It's a nice centerpiece in the garage now!
Yes it has!!! ![[Mad]](mad.gif) Now I'm curious to see what it'll look like completely torn down....
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Happiness isn't around the corner, happiness IS the corner!
'00 Silverado 1500 LT
'91 Mustang GT
Posts: 111 | From: San Jose, CA | Registered: Aug 2006
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92stangLX
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Member # 3252
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posted
quote:
Originally posted by JohnB:
The best part was the pieces were missing!
Happened to my friend (not b/c of ring gaps). He chipped a quarter size peice off of one piston. When we pulled off the head to see what happened we couldn't find the missing peice anywhere. Fortunatelly for him it didn't score the cylinder walls either. Just spat it out.
He replaced the piston and got the motor back together. Of course, it died about 6 months later from "excessive boost" at the race track
Posts: 5302 | From: San Francisco | Registered: Sep 2003
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GOT 50
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Member # 1960
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posted
How do gap less rings work then?
Posts: 2139 | From: SF/DALY CITY/MILLBRAE | Registered: Oct 2002
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JohnB
Tech Moderator
Member # 969
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posted
quote:
Originally posted by GOT 50:
How do gap less rings work then?
They overlap each other.
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1965 Shelby Cobra
1993 Cobra
2012 F150 Raptor
2020 GT500
Posts: 6523 | From: Orlando FL/Redding CA | Registered: Mar 2002
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