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The Terminator
Engine/Tuning
Honing cyl bore to increase piston to wall clearance
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<blockquote data-quote="ruff ruff" data-source="post: 4733395" data-attributes="member: 52565"><p>Could you please show me an instance of the ring land failing on a stock 03-04 cobra motor not attributed to detonation or piston to wall clearance issues? I would like to see pictures if avalable. All failure pictures I have seen involved piston to wall clearance or poor tuning.</p><p></p><p>Like you said importance is placed on emissions. That would also dictate a small compression ring gap and probably a tight ring groove as well. If betwen the piston expanding and the compression ring expanding the ring has nowhere to go then the ring land breaks that is not a piston failure that is still a clearance failure. Either piston to wall(since the ring groove depth expands along with the piston) or too small of a ring end gap.</p><p></p><p></p><p>I guess you have money to burn. We arn't talking a $5 diffrence here. Pistons can set you back something like $500-$900 for one of these cars. It costs money to get the rotating assembly balanced and if you can't use aftermarket stock diameter pistons you'll have to bore the block .020" over that costs money too.</p><p></p><p>If there is no reason to spend that money, why would you? You can spend it elsewhere.</p><p>If all it takes is rod bolts some new rings and a hone to be able to make 700 or 800 horsepower at the wheels why replace the pistons?</p></blockquote><p></p>
[QUOTE="ruff ruff, post: 4733395, member: 52565"] Could you please show me an instance of the ring land failing on a stock 03-04 cobra motor not attributed to detonation or piston to wall clearance issues? I would like to see pictures if avalable. All failure pictures I have seen involved piston to wall clearance or poor tuning. Like you said importance is placed on emissions. That would also dictate a small compression ring gap and probably a tight ring groove as well. If betwen the piston expanding and the compression ring expanding the ring has nowhere to go then the ring land breaks that is not a piston failure that is still a clearance failure. Either piston to wall(since the ring groove depth expands along with the piston) or too small of a ring end gap. I guess you have money to burn. We arn't talking a $5 diffrence here. Pistons can set you back something like $500-$900 for one of these cars. It costs money to get the rotating assembly balanced and if you can't use aftermarket stock diameter pistons you'll have to bore the block .020" over that costs money too. If there is no reason to spend that money, why would you? You can spend it elsewhere. If all it takes is rod bolts some new rings and a hone to be able to make 700 or 800 horsepower at the wheels why replace the pistons? [/QUOTE]
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The Terminator
Engine/Tuning
Honing cyl bore to increase piston to wall clearance
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