like topic states cylinder #1 has zero compression the rest have 220. what do u think is the problem i looked thru the spark plug hole and the piston looks fine and it moves up and down if i rotate the motor. i'm guessing its either the rings are completely shot or its the valves seals. but i have never seen a motor with zero compression in a cylinder. o and it barely runs spitting out a gang of black smoke

 

If it's zero compression, you more than likely lost a valve.

 

bump

 

I had no compression in a cylinder once and it was a burnt exhaust valve. Really it's the only logical explanation. You probably did not burn a hole in the piston, and the chances of your rings being 100% gone is slim to none, and intake valves don't usually burn unless the lash is too tight.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by crxhybrid85 &raquo;</TD></TR><TR><TD CLASS="quote">I had no compression in a cylinder once and it was a burnt exhaust valve. Really it's the only logical explanation. You probably did not burn a hole in the piston, and the chances of your rings being 100% gone is slim to none, and intake valves don't usually burn unless the lash is too tight.</TD></TR></TABLE>

i had 0 compression in my number four cylinder and my valves were fine. i melted a piston though. it could be detonation, but as they said, chances are its your valve.

 

cool cool keep the info coming

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by anothersickhatch &raquo;</TD></TR><TR><TD CLASS="quote">

i had 0 compression in my number four cylinder and my valves were fine. i melted a piston though. it could be detonation, but as they said, chances are its your valve.</TD></TR></TABLE>

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by street dreams' profile &raquo;</TD></TR><TR><TD CLASS="quote">poormans r w/ 12.1 compression and lots of goodies</TD></TR></TABLE>

Yup, but he's n/a so there's a much smaller chance that he detonated enough to melt a piston. My vote's still on an exhaust valve.

 

its not my car its my homeboys car

 

with a 12:1 n/a compression there is a really good chance of detonation..