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Author Topic: Broken part pics from E motor  (Read 8681 times)

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Offline Cajun Kid

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Broken part pics from E motor
« on: April 20, 2011, 08:54:53 PM »
Not as bad as it could have been. Lucky that when the valve head broke off the stem it did smack the piston a few times, but got knocked back in and stuck... also glad I shut down the motor when I did...





One new piston and a set of rings ordered and on the way,


Charles
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Offline DKrause615

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Re: Broken part pics from E motor
« Reply #1 on: April 20, 2011, 09:19:45 PM »
You're lucky.  At high RPM usually the piston disintegrates, and it's all over.  Been there, done that!

Thanks for your response to my C/FALT wing question.

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Offline Milwaukee Midget

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Re: Broken part pics from E motor
« Reply #2 on: April 20, 2011, 09:28:43 PM »
You did get lucky. 

Every time I think I've seen it all, something like this pops up and proves me wrong.

 
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Offline hotrod

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Re: Broken part pics from E motor
« Reply #3 on: April 20, 2011, 09:35:53 PM »
Yeah it is a bad sign if when you pull the head, there is no piston on the con rod, and the head looks like someone beat on it with a miners pick for a half an hour.

Quick a quick shutdown can save a lot of parts.

Had the same thing happen to an AMC 401 v8 - it broke an intake valve just like yours and the valve head sliced and diced the piston and all the pieces were in the oil pan. The broken valve head almost stuffed the exhaust valve head through the exhaust port too, head was a real mess.

Larry
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Offline racer x

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Re: Broken part pics from E motor
« Reply #4 on: April 20, 2011, 09:39:58 PM »
The worst blow up I had was a 455 Pontiac motor. When I pulled the manifold I found piston ring pieces about 1/2 inch long laying in the lifter valley.I still cant figure that out.
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Offline dw230

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Re: Broken part pics from E motor
« Reply #5 on: April 20, 2011, 09:49:00 PM »
Seen that one a lot. I measured a flathead at Bonneville once that had the piston perpendicular to the bore.

DW
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Offline Peter Jack

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Re: Broken part pics from E motor
« Reply #6 on: April 21, 2011, 12:07:17 AM »
That cylinder head should be really easy to repair by welding. You're a very lucky man Charles.

Pete
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Offline Cajun Kid

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Re: Broken part pics from E motor
« Reply #7 on: April 21, 2011, 09:38:44 AM »
PJ,, yes it sure could have and was mere seconds from being WORSE... I am Glad DART is working with me to cast a new block in my small bore size.  It delays the re build and I will not make May with the E motor,, but Hope for June  then a 200 MPH pass in July in Loring,,, I am sad the motor was hurt, glad it was not worse and now pumped on the new plan for the IMPROVED   "E"  motor...

Charles
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Offline salt27

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Re: Broken part pics from E motor
« Reply #8 on: April 21, 2011, 01:27:53 PM »
Charles,
Any idea of the cylinder wall thickness on your new Dart block?

Don
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Offline doug odom

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Re: Broken part pics from E motor
« Reply #9 on: April 21, 2011, 02:27:45 PM »
I would look real close for the reason the valve broke. Springs? Clearance? 8500rpm is not much on a good valve train. I run my SBC E motor 9500 so I'm not pullin your chain.
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Offline Cajun Kid

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Re: Broken part pics from E motor
« Reply #10 on: April 21, 2011, 04:50:58 PM »
Quote from: doug odom on April 21, 2011, 02:27:45 PM
I would look real close for the reason the valve broke. Springs? Clearance? 8500rpm is not much on a good valve train. I run my SBC E motor 9500 so I'm not pullin your chain.
Doug Odom in big ditch

Doug, my E motor turned 9500 on dyno too...  for Maxton I have it limited to 8500... I was saving so rpms for Bonneville..

Looks like the water in the valve guides held that exhaust valve open... and piston smaked it.
but no way to know for sure,,,

My valve train is high end high rpm stuff.. Offset shaft roker set up ti locks and keepers etc..
the weak link is the valves there are good SS Ferrera's  but not the Ti like I would prefer. I am working on Exceldyne now for Ti valves... but these are one off sizes... Since you have an E motor then you know what I mean.

Charles

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ECTA Record Holder Maxton
E/CBFALT, E/CBGALT, E/CGALT, E/CFALT, A/CGALT, C/CGALT, D/CGALT, C/CBGALT, B/CBGALT, C/CFALT
OHIO
B/CGALT, C/CGALT

LTA Record Holder and 200 Club Member
A/CBFALT, B/CBFALT, C/CBFALT, C/CFALT, C/CGALT,   E/CGALT, E/CFALT

Fastest Standing Mile at Ohio  203.343mph
Fastest Standing Mile at Maxton 196.967mph
Fastest Standing 1.5 Mile at Loring 213.624mph
Fastest Standing Mile at Loring 204.109mph

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Offline Tman

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Re: Broken part pics from E motor
« Reply #11 on: April 21, 2011, 05:20:59 PM »
Glad to see it was not worse Charles.
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Offline doug odom

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Re: Broken part pics from E motor
« Reply #12 on: April 21, 2011, 05:50:50 PM »
Charles, I just took a set of old Cup Titanium 1.625 exhaust valves and cut the OD down to 1.55. That is as big as will clear the small bore. Now yes I have engine building equipment and a valve grinder so my cost was just my own labor. If you want to know a cheap easy way to cut the head down, email me and I'll try and explain how I did it.
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Offline Cajun Kid

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Re: Broken part pics from E motor
« Reply #13 on: April 21, 2011, 07:35:23 PM »
Quote from: doug odom on April 21, 2011, 05:50:50 PM
Charles, I just took a set of old Cup Titanium 1.625 exhaust valves and cut the OD down to 1.55. That is as big as will clear the small bore. Now yes I have engine building equipment and a valve grinder so my cost was just my own labor. If you want to know a cheap easy way to cut the head down, email me and I'll try and explain how I did it.
Doug Odom in big ditch

That is a good idea,,I will start looking,,, My intake valves are 2.00 not sure of ex valve size, but think near 1.50

My bore is 3.765 and we had to do some serious machine work on the block and heads,,,

Thanks for the heads up.

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ECTA Record Holder Maxton
E/CBFALT, E/CBGALT, E/CGALT, E/CFALT, A/CGALT, C/CGALT, D/CGALT, C/CBGALT, B/CBGALT, C/CFALT
OHIO
B/CGALT, C/CGALT

LTA Record Holder and 200 Club Member
A/CBFALT, B/CBFALT, C/CBFALT, C/CFALT, C/CGALT,   E/CGALT, E/CFALT

Fastest Standing Mile at Ohio  203.343mph
Fastest Standing Mile at Maxton 196.967mph
Fastest Standing 1.5 Mile at Loring 213.624mph
Fastest Standing Mile at Loring 204.109mph

http://s261.photobucket.com/albums/ii43/cajunkid5690/

Blog    www.venablerodsandracing.com
email   venableracing@gmail.com

Offline Dan Stokes

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Re: Broken part pics from E motor
« Reply #14 on: April 21, 2011, 08:03:57 PM »
Bummer on the E-motor.  Want to borrow mine?  I have several.  Still, you'll have even more HP for sure.

Dan
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