Piston control rigs
Honda-Tech Member
Joined: May 2003
Posts: 1,543
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From: Ben Lomond, Ca, USA
Re: Piston control rigs (JDMbullshit)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDMbullshit »</TD></TR><TR><TD CLASS="quote">All riighty well I have a LS in my civic and it blows out blue smoke
new head gasket
could it be that the piston oil control rings are busted?</TD></TR></TABLE>
From a previous post:
Neither a compression test nor a leakdown test will tell you anything about the oil control rings. You could take them out and get higher compression and lower leakdown %. Those tests are telling you the condition of how well they are sealing air only.
When you are at wide open throttle there is a lot of oil throw off from the rods going onto the cylinder walls that the oil rings are not able to scrape off (in an engine with bad rings) and it burns in the cylinder and goes out the tailpipe as blue smoke. The reason it is not leaking past the valve guides at this point is because you have the throttle at wide open throttle so the pressure in the port near the end of the valve guide is close to the pressure in the valve cover so not much oil can get blown by, especially if the valve seals are OK.
However, if it smokes when you are decellerating the throttle is closed and there is high vacuum in the in the port and the intake manifold. This forces oil from the valve cover (high pressure) past the bad valve seals and through the valve guides into the port (low pressure area) where it is blown into the combustion chamber and burns and is blown out the tailpipe as blue smoke.
new head gasket
could it be that the piston oil control rings are busted?</TD></TR></TABLE>
From a previous post:
Neither a compression test nor a leakdown test will tell you anything about the oil control rings. You could take them out and get higher compression and lower leakdown %. Those tests are telling you the condition of how well they are sealing air only.
When you are at wide open throttle there is a lot of oil throw off from the rods going onto the cylinder walls that the oil rings are not able to scrape off (in an engine with bad rings) and it burns in the cylinder and goes out the tailpipe as blue smoke. The reason it is not leaking past the valve guides at this point is because you have the throttle at wide open throttle so the pressure in the port near the end of the valve guide is close to the pressure in the valve cover so not much oil can get blown by, especially if the valve seals are OK.
However, if it smokes when you are decellerating the throttle is closed and there is high vacuum in the in the port and the intake manifold. This forces oil from the valve cover (high pressure) past the bad valve seals and through the valve guides into the port (low pressure area) where it is blown into the combustion chamber and burns and is blown out the tailpipe as blue smoke.
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ILLA_00LS
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Jul 22, 2003 12:06 PM
