0 compression

ballajb64 · May 29, 2009

I have zero compression on my motor right now. What are the top things that i need to check? Oh by the way someone did some motor work on the car such as cam, new rockers and pushrods. Could it be because the pushrods are not long enough or too long? or maybe rockers are down too tight?

bentley429 · May 29, 2009

Um it has 0 compression on all cylinders? How did you test it?

rd · May 29, 2009

Improper adjustment of the rocker arms or the pushrod/rocker/head combo is not correct.

You could get this from the timing chain being off and bending the valves so they do not seal.

Gearbanger 101 · May 29, 2009

Put the spark plugs back in and try again.

BlownFiveLiter · May 29, 2009

Valve lash was probably set incorrectly.

stang9150 · May 29, 2009

I agree sounds like the valve adjsutment is off and that is causing your problem

vristang · May 30, 2009

Gearbanger 101 said:
Put the spark plugs back in and try again.

Where do you put the compression gauge if the spark plug is installed?

dcurtis · May 30, 2009

It does sound like valves were tightened way way and way too tight.
What cam and rockers did you add, mainly what type of rocker, pedestal or stud mount?

Gearbanger 101 · May 30, 2009

vristang said:
Where do you put the compression gauge if the spark plug is installed?

I'm talking about the other seven.

ballajb64 · Jun 3, 2009

so the valve lash is controlled by the rockers and how tight they are right? i am running a f303 cam, 1.6 ratio crane cam rockers and i am running stud mount. I am also running stock length hardened pushrods. with M-6049-X306 heads

PJC Racing · Jun 4, 2009

I guessing the valve train was never measured for proper pushrod length, correct? You need to correct this issue first and then properly set the lifter preload.

Dark Knight · Jun 4, 2009

Gearbanger 101 said:
I'm talking about the other seven.

Why would you put the others in? It doesnt change compression and it's less of a drain on the battery if all are out.

GDTrumbo · Jun 4, 2009

Gearbanger 101 said:
I'm talking about the other seven.

???? Compression tests are performed with all plugs removed..... My auto mechanics instructor would have pointed & giggled at you.

Plugs in the other 7will adversely affect readings on the 1 your checking, especially if the compression on the others is uneven. During each cyl.'s test, you should give it a good 7 or 8 compression strokes.

Each cyl. should also be tested 3 times and an average calculated.

GT

Gearbanger 101 · Jun 4, 2009

I was trying to be ironic, but I see my intent was lost on you guys.

GDTrumbo · Jun 4, 2009

Gearbanger 101 said:
I was trying to be ironic, but I see my intent was lost on you guys.

OH, OK. Hehe. I just couln't believe what I was reading.

GT

Gearbanger 101 · Jun 4, 2009

I thought the "" at the end of my statement might have given it away, but I was wrong.

0 compression

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