425 Compression Question.

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Old Aug 7, 2009 | 09:54 AM
  #161  
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It's comcastic.

I don't have any intentions of racing this car, so I was never worried too much about a lot of that stuff.
Old Aug 7, 2009 | 06:22 PM
  #162  
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From: Ontariario
Originally Posted by ijasond
Here's a shot of the piston.

Definitely looks like the low compression piston to me.
Old Aug 8, 2009 | 03:12 AM
  #163  
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Originally Posted by ijasond
........ I'm not really sure how to measure the piston dish volume ........
No different than any other cylinder.



Find the diameter,



and the depth.

http://www.online-calculators.co.uk/...ndervolume.php

Plug them into the calculator,

http://www.easysurf.cc/cnver6.htm#ic2

Convert cubic inches to cubic centimeters.

Norm
Old Aug 8, 2009 | 05:51 AM
  #164  
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25cc,plus or minus a couple thousandths.
Old Aug 8, 2009 | 07:15 AM
  #165  
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Norm,
Put down the vernier and grab a finger nail clipper.
Those pistons look similar to the ones I used. Premium fuel pistons.
Old Jun 23, 2010 | 07:28 PM
  #166  
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I finally got my money right to get the machine work done, get all the parts and start putting the beast back together. Definitely learned a lesson and will be a little more thorough and careful this time.
Old Jun 24, 2010 | 08:42 AM
  #167  
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I figured it out-
It is Norm's wifey's hands!!! (top pic only)
She helped him stage the pic.
Everyone say hi to Mrs. Norm!

Jim
Old Jun 24, 2010 | 01:22 PM
  #168  
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Originally Posted by ijasond
I finally got my money right to get the machine work done, get all the parts and start putting the beast back together. Definitely learned a lesson and will be a little more thorough and careful this time.
Just wondering, what changes will you make on the "new" build ?
Old Jun 24, 2010 | 04:47 PM
  #169  
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Originally Posted by nonhog
Just wondering, what changes will you make on the "new" build ?
I'm going to start by using the right pistons.
Other than that, I don't really plan to change anything.
I've had the crank machined and the rods & block checked out. I'm just going to take my time putting it all back together, carefully checking all the bearing tolerances.
Oh, and I'm definitely going to degree the camshaft this time.
Old Jun 24, 2010 | 04:50 PM
  #170  
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Originally Posted by gmrocket
fuel wash on a fresh rebuild can cause skirt scuffing which could lock the rings up. you wont know until you take it apart. since you have no oil pressure, that should be soon before you make it not rebuildable. i would try to figure out why its dumping excess fuel while its still running.
Definitely starting to show signs of skirt scuffing in a couple cylinders, but nothing major. I think that the fuel wash was a result of continuing to tinker with it unaware that it was in fact the wrong pistons. And also led to the demise of a bearing.
Old Jun 24, 2010 | 05:05 PM
  #171  
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Just FYI, I ended up getting the pistons and rings from Kanter.
Old Jun 26, 2010 | 04:40 AM
  #172  
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Originally Posted by Warhead
........ Everyone say hi to Mrs. Norm!
Hi Mrs. Norm
Old Sep 21, 2010 | 05:43 PM
  #173  
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Just an update for everyone that helped. I finally got her back on the road this past weekend. Took my time, checked and rechecked everything. I've got it purring like a tiger. Oil pressure is strong, sounds great, runs nice. I have a little hesitation at part throttle that I can't get rid of, so I'm still trying to decide on keeping the Edelbrock or rebuilding the old Q-Jet. Thanks again for everyone that helped, hopefully it will stick this time around. I'm getting her cleaned up for a show this weekend, I'll try to get some pictures up before the weekend is over. I'll post them in my thread over at major builds and projects.


https://classicoldsmobile.com/forums...ta-88-a-2.html

Last edited by ijasond; Sep 21, 2010 at 06:22 PM.
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