Blown Leitner & Bush block - pics inside
07-01-2003, 07:04 AM
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Blown Leitner & Bush block - pics inside
Here's some pics of my blown Leitner&Bush block.
Melted J.E. piston #3:
Modified by Turboteggy at 11:10 AM 8/7/2003
Melted J.E. piston #3:
Modified by Turboteggy at 11:10 AM 8/7/2003
07-01-2003, 07:43 AM
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I had a Cascar engine builder at my shop. He said the white ring around the piston is caused by blown rings. The motor was sucking oil&air past the rings and into the combustion chamber, leaning out the mixture. Never enough to blow up immediately, but slowly eating away at the edge of the piston, until finally it melted. That motor had about 40K of 17+ PSI on it. (2.5 years)
07-01-2003, 08:14 AM
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Re: (Turboteggy)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Turboteggy »</TD></TR><TR><TD CLASS="quote">I had a Cascar engine builder at my shop. He said the white ring around the piston is caused by blown rings. The motor was sucking oil&air past the rings and into the combustion chamber, leaning out the mixture. Never enough to blow up immediately, but slowly eating away at the edge of the piston, until finally it melted. That motor had about 40K of 17+ PSI on it. (2.5 years)</TD></TR></TABLE>
if air was going by the rings, that would mean less air in the chamber thus a richer mixture, not leaner.
if air was going by the rings, that would mean less air in the chamber thus a richer mixture, not leaner.
07-01-2003, 09:15 AM
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Re: (VaporTrail)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by VaporTrail »</TD></TR><TR><TD CLASS="quote">
if air was going by the rings, that would mean less air in the chamber thus a richer mixture, not leaner. </TD></TR></TABLE>
I think he meant oil vapor (though I'm not him).
if air was going by the rings, that would mean less air in the chamber thus a richer mixture, not leaner. </TD></TR></TABLE>
I think he meant oil vapor (though I'm not him).
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07-01-2003, 07:41 PM
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Probably. The main reasons for the failure are the rings and me. I upgraded to a much larger turbo, but hadn't gone in to re-tune the Hondata, so I may have been slightly underfueling.
07-01-2003, 07:58 PM
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Re: (Turboteggy)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Turboteggy »</TD></TR><TR><TD CLASS="quote">Probably. The main reasons for the failure are the rings and me. I upgraded to a much larger turbo, but hadn't gone in to re-tune the Hondata, so I may have been slightly underfueling.</TD></TR></TABLE>
No offense, but you say you upgraded to a MUCH larger turbo and you thought you may have been SLIGHTLY underfueling? Due to the increase in power up top, you were screwed because of the old map. The detonation caused by the lean condition wore the rings, which then allowed the blow-by which then messed you up even further. Live and learn I guess!
Modified by TurboSedan at 9:49 AM 7/2/2003
No offense, but you say you upgraded to a MUCH larger turbo and you thought you may have been SLIGHTLY underfueling? Due to the increase in power up top, you were screwed because of the old map. The detonation caused by the lean condition wore the rings, which then allowed the blow-by which then messed you up even further. Live and learn I guess!
Modified by TurboSedan at 9:49 AM 7/2/2003
07-01-2003, 11:25 PM
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Re: Blown Leitner & Bush block - pics inside (b18cx)
Lag doesn't cause a richness problem because the ecu only see's LOAD at rpm levels, not length of time of lag. 
How do you think you can get on it at 2500 rpm, and it lags and builds boost, or you can get on it at 6000 and have instant boost, and the ECU is tuned for both situations?!
Reverse blowby under high vacuum situations can suck oil vapor from the crankcase and cause the mixture oround the outside of the piston to be leaner, and therefore hotter, causing the burnoff of contaminants. My mustang has a pretty bad reverse blowby issue, but no real blowby. It still has me stumped. ICE's are some voodoo hoodoo things, even 120 years after their invention.
BTW, are you in the habit of engine braking at all? When braking, do you downshift and let out the clutch to let the car slow down on the engine? This can cause premature ring failure, causing the shown effects.
How do you think you can get on it at 2500 rpm, and it lags and builds boost, or you can get on it at 6000 and have instant boost, and the ECU is tuned for both situations?!
Reverse blowby under high vacuum situations can suck oil vapor from the crankcase and cause the mixture oround the outside of the piston to be leaner, and therefore hotter, causing the burnoff of contaminants. My mustang has a pretty bad reverse blowby issue, but no real blowby. It still has me stumped. ICE's are some voodoo hoodoo things, even 120 years after their invention.
BTW, are you in the habit of engine braking at all? When braking, do you downshift and let out the clutch to let the car slow down on the engine? This can cause premature ring failure, causing the shown effects.
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