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nicholastanguma Samba Member
Joined: June 29, 2009 Posts: 92 Location: LA and SF
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Posted: Fri Sep 17, 2021 9:39 pm Post subject: Does Small Oil Capacity Matter If You Have A Lot Of Oil Cooling? |
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Time for another bench racing engineering question.
If using a good oil cooler and giant cooling fins on the jug itself how small could an air cooled engine's oil capacity safely be?
For example: 1.5 liters for a 500cc single cylinder? 1.0 liter for a 350cc single cylinder? 1.0 liter for 250cc? You get the idea.
The air cooled, 4 valve Husqvarna 510 from the 80's was a four stroke thumper that used a mere ONE PINT of oil for the entire engine. It was known as a hot temp engine, but according to Super Hunky himself was of anvil reliability. There's some kind of voodoo engineering they were employing, I think.
Last edited by nicholastanguma on Sat Sep 18, 2021 2:58 am; edited 1 time in total |
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anthax Samba Member
Joined: October 21, 2016 Posts: 283 Location: Hälsingland, Sweden
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Posted: Sat Sep 18, 2021 1:00 am Post subject: Re: Does Small Oil Capacity Matter If You Have A Lot Of Oil Cooling? |
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As long as there is enough oil to drain back to the sump to prevent oil starvation, you have enough.
I guess it's a thing you have to test to figure out.
More oil takes more time to heat, but also takes more time to cool. |
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Alstrup Samba Member
Joined: July 12, 2007 Posts: 7214 Location: Videbaek Denmark
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Posted: Sat Sep 18, 2021 3:03 am Post subject: Re: Does Small Oil Capacity Matter If You Have A Lot Of Oil Cooling? |
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anthax wrote: |
As long as there is enough oil to drain back to the sump to prevent oil starvation, you have enough.
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That! _________________ https://www.thesamba.com/vw/forum/viewtopic.php?t=435993 |
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oprn Samba Member
Joined: November 13, 2016 Posts: 12714 Location: Western Canada
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Posted: Sat Sep 18, 2021 4:57 am Post subject: Re: Does Small Oil Capacity Matter If You Have A Lot Of Oil Cooling? |
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It matters not whether you have 2 pints of oil or 2 gallons. The oil temperature will be the same in the long run. If your engine runs too hot a larger capacity just delays the inevitable. If your engine runs too cold a larger capacity with delay the warm up even further. _________________ We had the stone age, the bronze age, the industrial age and now we are in the age of mass deception and mind control for corporate profit. (The mass media age) |
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FreeBug Samba Member
Joined: March 12, 2012 Posts: 4278 Location: deepest, darkest Switzerland
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Posted: Sat Sep 18, 2021 1:13 pm Post subject: Re: Does Small Oil Capacity Matter If You Have A Lot Of Oil Cooling? |
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Dry sump folks might be able to give you some ideas...you didn't say where you wanted to store that 1.5 liters of oil...and they might know the pump's and engine's oil flows. I can say this: if you are a liter low in the crankcase (stock, no sump.), the idiot light comes on in the twisties.
The four vs 3 vs 2 vs 1 cylinder engine's crankcase volumes are not linear. The size of the surface areas for oil to hang around on aren't linear, either. |
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67rustavenger Samba Member
Joined: February 24, 2015 Posts: 9762 Location: Oregon
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Posted: Sat Sep 18, 2021 1:34 pm Post subject: Re: Does Small Oil Capacity Matter If You Have A Lot Of Oil Cooling? |
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I had a Husaberg FC501 a few years back. That 4 stroke single only took 1 quart to fill the trans, crank case. There's a lot of stuff in a motorcycle engine that needs bathing in oil. But with all that stuff crammed in the case. There was really no need for more than that 1 quart.
I agree with the 1 ltr. low comment. Mine would loose oil pressure on a hard right turn once in a while.
A 1.5 quart mini sump took care if that problem! _________________ I have learned over the years.
Cheap parts are gonna disappoint you.
Buy Once, Cry Once!
There's never enough time to do it right the first time. But there's always enough time to do it thrice.
GFY's Xevin and VW_Jimbo! |
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