I know that during breakin when you check for compression you're just measuring consistency and not really how high the numbers are. I have a newly rebuilt motor, have not turned it over yet but decided to do a test before wiring it up. Starting from cyl #1 I got, 155-128-150-100, is this normal until the engine has its first combustion? Or could my valve lash be bad on a few cylinders




Modified by astralshadow at 12:43 PM 7/7/2008

 

oh and also these are wiseco pistons, with a cap full of oil in each cylinder before testing

 

IMO the rings are not seated yet.

Start the engine and break it in.

 

After about how many miles should the readings become consistent across the board?

 

Most people don't worry about it if it runs good.

Don't over think this.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by astralshadow &raquo;</TD></TR><TR><TD CLASS="quote">I know that during breakin when you check for compression you're just measuring consistency and not really how high the numbers are. I have a newly rebuilt motor, have not turned it over yet but decided to do a test before wiring it up. Starting from cyl #1 I got, 155-128-150-100, is this normal until the engine has its first combustion? Or could my valve lash be bad on a few cylinders


Modified by astralshadow at 12:43 PM 7/7/2008</TD></TR></TABLE> I fyou do not know if the valve lash is bad on a few cylinders, do not start it, ADJ. your valves.

 

Thanks for the input guys Don, valve lash can't be terribly off considering how **** I was about it measuring, but if I hear the slightest bit of ticking I'll shut that thing down immediately. But maybe you're right to give it another once-over before starting. Hopefully I'll get time this weekend to crank it up, I'll keep posted incase anyone else has the same questions