Originally Posted by turboguzzi (Post 531862)

nice how you learn something new everyday.... knew about oil expansion but thought it was negligible, this thread led me to check exactly. I am building a new oil aluminum tank for my racer and turns out that at 150 Celsius you can easily get a 10-15% increase, over 2 litres of oil for instance, that's a good 200- 300 c.c., explains the tank "refilling" after a long ride i guess :) wasnt considering that in my calcs.

i see it's mostly young dudes here.... because for those with british bike experience, "wet sumping" as it was called was a common experience: literally ALL the tank going down, though with the very small crankcase for just the flywheel (pre-unit), it meant that it would get full to the brim and spit quite some oil from everywhere possible until it was back to the tank. it was very common to fit manual valves on the supply tube, which of course, sometimes you'd forget to open with disastrous results. later properly working check valves came into the aftermarket.

Originally Posted by Lonerider (Post 531292)

Before I started it I checked to see if there was any oil in the neck, nothing, it was bone dry. I started the bike (it started first time) and ran it for 10 mins. After turning it off and leaving it a minute I again checked the oil, still the dipstick was bone dry.

Originally Posted by Lonerider (Post 531871)

I've not been called young in a long time :rofl:

Wayne