Quote:
Originally Posted by DannoXYZ
However, if you're maintaining bike near redline under racing conditions, you'll want to go off right side of scale with 50-weight; even then it may not be enough. I've found most 15w50 or 20w50 actually drops oil-pressure at end of 20-min track session in +100F heat even with radiator-fan connected. The only oil I've found that doesn't do this is Motorex 4T 10w50 oil. |
How are you reading oil pressure? What is it?
Low pressure (hot) at idle isn't a problem. At high RPMs there should be plenty of excess pressure that is being bled off anyway.
There are some studies out there about oil weight/temp/pressure on track. Their basic conclusion is that heavier oil isn't better, or required, to sustain adequate pressure even in the hottest conditions.
The key is synthetic oil, which doesn't have any breakdown issues at extreme temps like conventional oil does.