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New Edge Cobras
2001 Cobra Spun rod bearings at 57k? Oil starvation? Motor Replacement advice?
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<blockquote data-quote="CobraRed01" data-source="post: 14253879" data-attributes="member: 11346"><p>I've always wondered if in these motors there isn't some kind of trade off between running heavier oil like 5W30 or even 10W30 that everyone claims you should do and some bearing issues we see. Could it be that the 5W20 actually flows better out of the heads at higher revs? Heavier oil is useless if it is not making it to the crank. Sure, at higher temps on the track the heavier grade may be warranted...but for only occasional hard use at high rpm runs may be 20 weight is better. </p><p></p><p>Also, how many New Edgers lug their motors around town trying get better mileage? This could have an impact on bearing life. The more you keep the revs up (at moderate levels) the better the oil flow and relatively less pulse pressure on the lower bearings. These motors are not designed to be lugged around.</p><p></p><p>I don't have any hard data on this. Just makes me wonder.</p></blockquote><p></p>
[QUOTE="CobraRed01, post: 14253879, member: 11346"] I've always wondered if in these motors there isn't some kind of trade off between running heavier oil like 5W30 or even 10W30 that everyone claims you should do and some bearing issues we see. Could it be that the 5W20 actually flows better out of the heads at higher revs? Heavier oil is useless if it is not making it to the crank. Sure, at higher temps on the track the heavier grade may be warranted...but for only occasional hard use at high rpm runs may be 20 weight is better. Also, how many New Edgers lug their motors around town trying get better mileage? This could have an impact on bearing life. The more you keep the revs up (at moderate levels) the better the oil flow and relatively less pulse pressure on the lower bearings. These motors are not designed to be lugged around. I don't have any hard data on this. Just makes me wonder. [/QUOTE]
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2001 Cobra Spun rod bearings at 57k? Oil starvation? Motor Replacement advice?
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