Tech / General Engine Is your car making a strange sound or won't start? Thinking of adding power with a new combination? Need other technical information or engine specific advice? Don't see another board for your problem? Post it here!
Sponsored by:
Sponsored by: CARiD

No compression?

Thread Tools
 
Search this Thread
 
Old Feb 19, 2009 | 09:12 PM
  #1  
360Iroc's Avatar
Thread Starter
Member
 
Joined: Jan 2002
Posts: 373
Likes: 0
From: Columbus OH
No compression?

Rings were installed per box instruction...

Turn the engine over by hang with spark plug in the hole and can hear air coming from the oil pan.

Whats going on?
Reply
Old Feb 20, 2009 | 09:37 PM
  #2  
birdtojag's Avatar
Senior Member
iTrader: (1)
 
Joined: Jan 2007
Posts: 684
Likes: 1
From: Mesa AZ
Car: 87 Firebird, 90 bird coming soon
Engine: 355 Chevy Vortec Heads TPI, LT1 inj
Transmission: 700r4
Axle/Gears: 2.77 posi 9-bolt
Re: No compression?

Spray a little WD40 in the spark plug holes. This will help get the engine started and able to run. Did you hone the cylinders? If so, follow the break-in instructions. If not, the rings will not seat correctly and you will need to pull it all apart again. And as long as you didn't line up all the gaps, you should be fine.
Reply
Old Feb 21, 2009 | 10:23 PM
  #3  
360Iroc's Avatar
Thread Starter
Member
 
Joined: Jan 2002
Posts: 373
Likes: 0
From: Columbus OH
Re: No compression?

All of the rings are 180 from each other. Block was bored .030 over then honed. Its a 12.0-1 engine.

Seems what you have said was repeated by a friend of mine. He suggested the same thing. The engine is not in the car yet. I was just turning it over to adjust all the valvetrian. I could never remember my last one doing this.
Reply
Old Feb 21, 2009 | 11:18 PM
  #4  
ljnowell's Avatar
Supreme Member
 
Joined: Mar 2004
Posts: 3,935
Likes: 0
Re: No compression?

If you are 100% sure that you have the rings in right, you may still have nothing to worry about. If the rings were in upside down, it could cause something like that. However, without the force of combustion gasses forcing the rings into place, you may get quite a bit of that. The pressure being generated just isnt enough to seal the rings to the bore.
Reply
Old Feb 22, 2009 | 10:22 AM
  #5  
TylerP's Avatar
Member
 
Joined: Nov 2008
Posts: 113
Likes: 0
From: Harrodsburg,Ky
Car: 89 T/A and 97 Formula (sunny days)
Engine: 305 TBI / LT1
Transmission: 700R4 / 6M
Axle/Gears: 89 IDK / 97 3.73
Re: No compression?

Did you check piston clearances? Ring gap?
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
FormulasOnly
TPI
95
Jul 23, 2018 08:47 AM
69GTOby
Tech / General Engine
40
Apr 18, 2016 02:34 PM
Nervous2
Firebirds for Sale
2
Oct 8, 2015 10:53 PM
Jonas Earl
Engine Swap
8
Sep 27, 2015 07:39 AM
WhteRbt
Tech / General Engine
2
Sep 21, 2015 09:48 AM




All times are GMT -5. The time now is 02:00 PM.