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What should the compression be and how do I know I set the timing correctly?

Tiny
MBLAD
  • MEMBER
  • 1996 PLYMOUTH NEON
The water pump froze so I had to replace it and the timing belt now the car starts but spits and spudders. There was marks for the timing that I had lined up. How do I know if it is correct or is it doing this because the compression is bad since maybe some valves got bent. How do I check this?
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Thursday, May 31st, 2012 AT 3:38 PM

3 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Very likely on the bent valves. You need to be over 100PSI and all within 10% of each other.
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Thursday, May 31st, 2012 AT 3:55 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Check compression 170-225 psi but engine is a valve bender so VERY likely valves were bent
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Thursday, May 31st, 2012 AT 3:56 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Doc is correct according to spec. What I posted was the minimum to avoid misfire. Looks like you can have up to 25% different between cylinders too.
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Thursday, May 31st, 2012 AT 4:01 PM

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