After only 500 miles of breaking in my rebuilt engine .... it started to burn/throw oil thru the no. 1 cylinder and out the exhaust. When we tore it down we found the bottom ring on the no. 1 cylinder to be broken. So far everyone says it was the guy that installed the pistons/rings fault. Is there any other way it could have gotten broken. I guess the ring could have been broke to begin with but shouldn't the installer have ckeck that before putting them in. Looking for any ideas on how this happened. Just to add the car was not driver over 4000 rpm or 70 mph and was running fine up to is started burning/pushing oil @ 500 miles or so.

 

I say bad luck...
But I really don't know.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bbasso &raquo;</TD></TR><TR><TD CLASS="quote">I say bad luck...
But I really don't know.</TD></TR></TABLE>

since the piston/rings and the installation are both guarenteed for 90 days, it would be good to know who's bad luck besides mine. Do I tag the installer or the piston/ring supplier ?

 

Maybe the ring end gap was too small...when the engine warmed up the ends of the rings came into contact..and as the rings expanded further with nowhere to go the ring broke?

 

detonation could have done it too...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DELUSIONEK4 &raquo;</TD></TR><TR><TD CLASS="quote">detonation could have done it too...</TD></TR></TABLE>

never had any detonation ......... never took the car over 4000rpm and no boost.
I was breaking it in the slow method . 3500 first 200 miles 4000 next 200 and so on.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by daddy ITR &raquo;</TD></TR><TR><TD CLASS="quote">never had any detonation ......... never took the car over 4000rpm and no boost.
I was breaking it in the slow method . 3500 first 200 miles 4000 next 200 and so on. </TD></TR></TABLE>

Proof that if you break it in "nicely" or not, if its a good motor it will last. If not its going to breakdown again.

I always have admired how somedirt bikes are broken in. A couple full redlines from a fresh rebuild on the dyno!

 

forged pistons need more clearance than cast because they expand more, might have been a clearance issue.

 

A severe case of detonation would have broken the upper rings and ring lands before it killed the oil control rings.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vtec.dc2 &raquo;</TD></TR><TR><TD CLASS="quote">forged pistons need more clearance than cast because they expand more, might have been a clearance issue. </TD></TR></TABLE>

I used Endyn Roller Wave and was told the installer followed their clearance specs and I follow their breakin specs. The block was sleeved with darton sleeves .... everything was done that could be done. I hate to say it, but the installer did a very sloppy job. One of the clip rings on the piston to rod pin had popped loose. I really believe that the installed force the piston into the block and broke the ring. I just wanted to hear form the ITR forum as too possible other causes.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SavageNation &raquo;</TD></TR><TR><TD CLASS="quote">Proof that if you break it in "nicely" or not, if its a good motor it will last. If not its going to breakdown again. </TD></TR></TABLE>

If the engine is assembled poorly, it is going to fail, no mater how good the motor parts are. Wrong torque, wrong clearance, dust in the assembly area, that list goes on as to how an installer can mess things up. The customer is left to the mercy of the shop that builds the motor. I guess we pay our money and take our chances, but it this case I think the shop has to take some responsibility.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SavageNation &raquo;</TD></TR><TR><TD CLASS="quote">I always have admired how somedirt bikes are broken in. A couple full redlines from a fresh rebuild on the dyno! </TD></TR></TABLE>


hotness.

 

I completely agree. I was merely stating exactly what you pointed out, that if the engine is built properly, its going to be a good engine and run its course. Now if the engine is built poorly due to an improper rebuild such as the case we have in this specific situation, the motor failed.

All I pointed was if a rebuild is a good rebuild, one can argue that a fresh motor does not need a break-in. Of course, this is all opinion.

 

most likely scenerio is they broke the bottom ring putting it in, because i have never heard of the oiler ring breaking... I have on a couple ocasions broken then oiler. sorry to hear!

-Josh

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Blind Fashion &raquo;</TD></TR><TR><TD CLASS="quote"> most likely scenerio is they broke the bottom ring putting it in, because i have never heard of the oiler ring breaking... I have on a couple ocasions broken then oiler. sorry to hear!

-Josh</TD></TR></TABLE>

I just found out that the work was done by a machine shop in Dallas by the name of Stoid Racing. They have a reputation for doing sloppy work ...... that accounts for the broken oil ring.