cranny Posted November 25, 2006 Share Posted November 25, 2006 cause of the friction between the bearing and the crank , created by the force of the piston(weight), decelerating and accelerating away again. the turnover. almost like the crank is turning faster than the piston can go up and down , like its falling behind. that or was low on oil maybe , lol. Link to comment Share on other sites More sharing options...
..SSR.. Posted November 25, 2006 Author Share Posted November 25, 2006 Piston weight has to do with it. Crank turning doesn't have to do with it. Big end. Link to comment Share on other sites More sharing options...
EH6TunerDaniel Posted November 28, 2006 Share Posted November 28, 2006 Does the weight of the piston cause the OEM rod to deform at the bottom, causing the spun bearing? Link to comment Share on other sites More sharing options...
..SSR.. Posted November 28, 2006 Author Share Posted November 28, 2006 Somewhat. The big end deforms slightly causing the bearing to come in contact with the crank, and you have yourself the beginning of a spun bearing. Lighter pistons will help against this. Aftermarket rods will if they are designed correctly. Look at OEM rods (we're talking big end here). They have one rib in the center. Now look at a RM/Eagle/TT rod, they have two ribs, one on each side. This keeps the big end from deforming. Link to comment Share on other sites More sharing options...
cranny Posted November 28, 2006 Share Posted November 28, 2006 would fall into the piston rod stretching category wouldnt it? lol , i mean in order to deform metal you have to do what? stretch it maybe? haha Link to comment Share on other sites More sharing options...
90IntegraC1 Posted November 28, 2006 Share Posted November 28, 2006 oh ok, so a good investment is aftermarket rods to prevent a spun bearing. got it. Link to comment Share on other sites More sharing options...
Kegger Posted November 28, 2006 Share Posted November 28, 2006 That was along time in the making. Damn... Link to comment Share on other sites More sharing options...
EH6TunerDaniel Posted November 28, 2006 Share Posted November 28, 2006 So I got it right? Sweet. Link to comment Share on other sites More sharing options...
cranny Posted November 28, 2006 Share Posted November 28, 2006 negative , i called that on the 1st page , hahaha. Link to comment Share on other sites More sharing options...
Hatch92 Posted November 29, 2006 Share Posted November 29, 2006 That was along time in the making. Damn... i'll agree with that. Link to comment Share on other sites More sharing options...
..SSR.. Posted November 29, 2006 Author Share Posted November 29, 2006 Not rod stretch. The big end distorts, but the rod doesn't stretch. Kind of weird. I thought about this a few weeks ago then called up Brad to see if he has done any testing. Showed me a vid made with a high speed camera. Link to comment Share on other sites More sharing options...
cranny Posted November 29, 2006 Share Posted November 29, 2006 lol , whatever. Link to comment Share on other sites More sharing options...
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