Ratio rite shows different amount for 32:1 vs fluid ounces?

JBecker 72
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JBecker 72
Edited Date/Time 9/7/2017 5:22pm
Possibly a very dumb question, but why do all of my measuring cups read different between the ratio lines and the fluid ounce lines? Example: the 32:1 line is about half an ounce lower than the 20 ounce line. 32:1 = 32 ounces of gas (1 quart) : 1 ounce of oil. 4 quarts in a gallon so 4 ounces of oil per gallon. 4 ounces X 5 gallons = 20 ounces of oil. What gives?

Edit: so it turns out this one is just poorly made.

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Paw Paw
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Paw Paw 9/7/2017 12:30pm
9/7/2017 12:30pm
That does not look like a ratio right cup to me. You could be way off using that set up.

Paw Paw
JBecker 72
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JBecker 72 9/7/2017 12:41pm
9/7/2017 12:41pm Edited Date/Time 9/7/2017 12:48pm
Paw Paw wrote:
That does not look like a ratio right cup to me. You could be way off using that set up.

Paw Paw
.......
JBecker 72
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JBecker 72 9/7/2017 12:47pm
9/7/2017 12:47pm
Paw Paw wrote:
That does not look like a ratio right cup to me. You could be way off using that set up.

Paw Paw
Aww hell, you're right. I've been using this other one because it holds enough to mix 5 gallons at a time.
JBecker 72
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JBecker 72 9/7/2017 12:51pm
9/7/2017 12:51pm Edited Date/Time 9/7/2017 12:53pm
Well, good news is I've been using the ounces mark. I poured 10 ounces of water out of the ratio rite into this one and got 10 ounces. Did it again and was right at 20.

10 ounces in ratio rite is same height as 32:1 for 2.5 gallons.

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MotoTribology 9/7/2017 1:07pm
9/7/2017 1:07pm Edited Date/Time 9/7/2017 1:43pm
That is weird since it should be the exact opposite. It takes 20.6 oz. to get a true 32:1 ratio with 5 gallons of gas. To get the true ratio you need to factor in the additional volume the oil adds. So 640 oz. becomes 660.6 oz. total because 32:1 of that is 20.6 oz.
JBecker 72
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JBecker 72 9/7/2017 1:13pm
9/7/2017 1:13pm
MotoTribology wrote:
That is weird since it should be the exact opposite. It takes 20.6 oz. to get a true 32:1 ratio with 5 gallons of gas. To...
That is weird since it should be the exact opposite. It takes 20.6 oz. to get a true 32:1 ratio with 5 gallons of gas. To get the true ratio you need to factor in the additional volume the oil adds. So 640 oz. becomes 660.6 oz. total because 32:1 of that is 20.6 oz.
I was kind of thinking along those lines when I made the thread. Just didn't bother to do any math. Figured there was something I might be missing.

FWIW the brand I took a picture of is a Bikemaster.
Acidreamer
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Acidreamer 9/7/2017 5:13pm
9/7/2017 5:13pm
Real scientists use cylinders and beakers anyways. Cant trust them bikemaster chinese ones
YZ125H1
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YZ125H1 9/7/2017 5:17pm
9/7/2017 5:17pm Edited Date/Time 9/7/2017 5:22pm
I think I have the same measuring cup. It was a bit confusing at first because it has different mix ratios depending on how much gas you are mixing. (1, 2 and 5 gallons IIRC). Never noticed anything with the fluid ounces I will have to check it out this weekend. It wouldn't surprise me if it is wrong. Never used the FL OZ mark just the ratio marks for me which was 40:1.
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ToolMaker 9/8/2017 8:42pm
9/8/2017 8:42pm
MotoTribology wrote:
That is weird since it should be the exact opposite. It takes 20.6 oz. to get a true 32:1 ratio with 5 gallons of gas. To...
That is weird since it should be the exact opposite. It takes 20.6 oz. to get a true 32:1 ratio with 5 gallons of gas. To get the true ratio you need to factor in the additional volume the oil adds. So 640 oz. becomes 660.6 oz. total because 32:1 of that is 20.6 oz.
Um, no.
TM

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