ChristianReske
Thread starter
Interesting Read: https://blog.k1technologies.com/bearing-clearance-and-oil-viscosity-explained
Hondas recommendation of a -30 viscosotiy and the bearings clearances in the workshop manual of the S2000 matches these results.
And here is more: https://www.enginebuildermag.com/2013/03/bearing-clearances/
"Reducing the oil clearance between the rod and main bearings and the crankshaft has a number of advantages. A smaller gap spreads the load over a wider area of the bearing surface and distributes pressure more uniformly across the bearing. That’s good, provided the bearing is strong enough to handle it. A smaller gap also decreases the volume of oil that has to flow into the bearing to maintain the oil film between the bearing and shaft.
That’s also good, provided the oil is thin enough (low viscosity) to flow well into the bearing. This also reduces the amount of oil pressure the engine needs, so some extra horsepower is gained by reducing the load on the oil pump."
Interesting read!
The last two reports about damaged engines in the german S2000 Community had two things in common:
Both owners tried to reach top-speed of the car on the autobahn and both used -50 (!) oil.
I trust the engineers at Honda, i will use a thick 30 - thin 40 Oil, viscoity range 11-13 KV 100°. And i will never press the car to the limit on the autobahn, i am convinced that this engine is not safe for long time full throttle runs because of the insane piston speed at 9000 RPM.
Hondas recommendation of a -30 viscosotiy and the bearings clearances in the workshop manual of the S2000 matches these results.
And here is more: https://www.enginebuildermag.com/2013/03/bearing-clearances/
"Reducing the oil clearance between the rod and main bearings and the crankshaft has a number of advantages. A smaller gap spreads the load over a wider area of the bearing surface and distributes pressure more uniformly across the bearing. That’s good, provided the bearing is strong enough to handle it. A smaller gap also decreases the volume of oil that has to flow into the bearing to maintain the oil film between the bearing and shaft.
That’s also good, provided the oil is thin enough (low viscosity) to flow well into the bearing. This also reduces the amount of oil pressure the engine needs, so some extra horsepower is gained by reducing the load on the oil pump."
Interesting read!
The last two reports about damaged engines in the german S2000 Community had two things in common:
Both owners tried to reach top-speed of the car on the autobahn and both used -50 (!) oil.
I trust the engineers at Honda, i will use a thick 30 - thin 40 Oil, viscoity range 11-13 KV 100°. And i will never press the car to the limit on the autobahn, i am convinced that this engine is not safe for long time full throttle runs because of the insane piston speed at 9000 RPM.