the question is should i replace pistons and rings or just replace the rings? what do yall recommend i should do? i know i will have to hone the block. but would replacing all of the rings on the pistons fix my compression because i have a set of oem pistons rings that i brought. the sleeves are not scarred up.

The compression of the motor was 170-170-170-40psi
The motor is a B18c1 with Eagle Roads and Weisco pistons.
It was turbo'd

thanks

 

What caused the 40? That's not just worn rings.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rmcdaniels &raquo;</TD></TR><TR><TD CLASS="quote">What caused the 40? That's not just worn rings.</TD></TR></TABLE>

hmm, i am not sure exactly. i know the motor was blowing out mad smoke out of the hole on the valve cover constantly looked like a fog machine running lol

 

the only other thing i can think of is cracked ringlands

 

That or you melted one, you'd have to try pretty hard to crack a ring land on a Wiseco piston. Either way it would scar up the cylinder wall, requiring a bore.

 

i recommend you replace the WHOLE bottom end with new parts since you have it torn apart......

 

If your lucky you can just replace the rings and bearings but you need to pull the head to see how bad the damage is.

Do you think it could just be the head gasket that's blowen ?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1992Si &raquo;</TD></TR><TR><TD CLASS="quote">If your lucky you can just replace the rings and bearings but you need to pull the head to see how bad the damage is.

Do you think it could just be the head gasket that's blowen ?
</TD></TR></TABLE>

yea, i already pulled the head to check, just haven't pulled out the pistons/rods

 

also take the head and have them leakcheck the valves. thats a lot of missing compression. thinking your gonna have a worse problem than rings but it is possible. if the piston and cylinder wall are ok i would prob just reuse pistons

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by agrn93ls &raquo;</TD></TR><TR><TD CLASS="quote">also take the head and have them leakcheck the valves. thats a lot of missing compression. thinking your gonna have a worse problem than rings but it is possible. if the piston and cylinder wall are ok i would prob just reuse pistons</TD></TR></TABLE>

from looking at the head, when i took out the cams, all the valves looked flushed to me as in closed. that one cylinder that has 40psi, has a lot of carbon build up

 

Valves can look closed and still be bent. see if the ports will hold some solvent, or remove the valves and look at the shiny pattern around the seats to see if they are seating evenly.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by oxSLEEPERxo &raquo;</TD></TR><TR><TD CLASS="quote">
yea, i already pulled the head to check, just haven't pulled out the pistons/rods</TD></TR></TABLE>

Sleeve damage can be low in the cylinder. On the last motor that I trashed, the pistons scraped the cylinder walls at the bottom of the stroke, where there's the most side loading. It wasn't evident until I removed the internals, but the scraped portion of the cylinder wall trashed the rings and caused a loss of compression.

 

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

Sleeve damage can be low in the cylinder. On the last motor that I trashed, the pistons scraped the cylinder walls at the bottom of the stroke, where there's the most side loading. It wasn't evident until I removed the internals, but the scraped portion of the cylinder wall trashed the rings and caused a loss of compression. </TD></TR></TABLE>

hmm, i guess i am going try pull out the rods and pistons this week and take a closer look. my friend too the head to a machine shop to put in some valves, springs, and retainers, i guess we will find out if the valve got bent