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Electronic Octane Testers on eBay #5443409 05/31/20 05:35 PM
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smonska Offline OP
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So, for $115 you can buy an Octane Tester tool on eBay, seems like the kind of thing a nerdy engineer like me would buy for no valid reason. :-)

Has anyone tried one, and if so how different are various stations' octanes? Most of my vehicles require 91, one (my Ram) takes 89. Would be neat to know if I'm getting what I pay for.

https://www.ebay.com/sch/i.html?_fr...TRS0&_nkw=octane+tester&_sacat=0

Last edited by smonska; 05/31/20 05:35 PM.

'67 Camaro 327 RT 15w-40
'06 Audi 2.0T GC 0w-40
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Re: Electronic Octane Testers on eBay [Re: smonska] #5443416 05/31/20 05:45 PM
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sloinker Offline
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Motor or RON ?

Re: Electronic Octane Testers on eBay [Re: smonska] #5443417 05/31/20 05:45 PM
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eljefino Offline
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I wonder if it needs any consumables to run, and/or how long the calibration will stick.

Re: Electronic Octane Testers on eBay [Re: smonska] #5443428 05/31/20 05:59 PM
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ammolab Offline
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It is from Russia, what could go wrong?


1998 Jeep Cherokee
2011 BMW R1200R
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Re: Electronic Octane Testers on eBay [Re: smonska] #5443453 05/31/20 06:27 PM
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y_p_w Offline
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There are portable testers that are accurate and even used for mobile spot testing. Quite a few states have mobile labs that can do this sort of thing.

https://store.clarksonlab.com/K88600.aspx

Anyone want to spend $17,000 on one though?

[Linked Image from store.clarksonlab.com]

Re: Electronic Octane Testers on eBay [Re: smonska] #5443468 05/31/20 06:52 PM
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dishdude Online Content
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If you want to throwaway $115, I'll send you my address! haha


2018 Challenger SRT 392 PUP 0w-40 Wix 57899XP
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Re: Electronic Octane Testers on eBay [Re: smonska] #5443514 05/31/20 08:02 PM
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Marco620 Offline
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I sit on my octane tester in the car everyday. Granted its only able to sense non ethanol grades 87 to 104.


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Re: Electronic Octane Testers on eBay [Re: Marco620] #5443515 05/31/20 08:05 PM
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kschachn Offline
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Originally Posted by Marco620
I sit on my octane tester in the car everyday. Granted its only able to sense non ethanol grades 87 to 104.

I don't understand. The octane rating isn't dependent on the fuel composition like that, there are many ways to create an apparent octane rating. In that regard your engine can't tell the difference, as far as the knock sensors are concerned (or your ear) it doesn't matter whether the gasoline is straight iso-octane or contains MMT, toluene, tetraethyl lead or ethanol.


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Re: Electronic Octane Testers on eBay [Re: kschachn] #5443559 05/31/20 09:18 PM
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y_p_w Offline
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Originally Posted by kschachn
Originally Posted by Marco620
I sit on my octane tester in the car everyday. Granted its only able to sense non ethanol grades 87 to 104.

I don't understand. The octane rating isn't dependent on the fuel composition like that, there are many ways to create an apparent octane rating. In that regard your engine can't tell the difference, as far as the knock sensors are concerned (or your ear) it doesn't matter whether the gasoline is straight iso-octane or contains MMT, toluene, tetraethyl lead or ethanol.

Sounds like a "butt dyno" joke really.

I thought that the practical way would be to test in an engine against a fuel made with iso-octane and n-heptane. But with that the limit is 100% iso-octane as the reference.

I remember hearing about octane rating rigs that use variable compression ratio engines to test higher than 100 octane. Something like this:

[Linked Image from researchgate.net]

Re: Electronic Octane Testers on eBay [Re: smonska] #5443569 05/31/20 09:28 PM
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Dinoburner Offline
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How would one calibrate such a device?


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Re: Electronic Octane Testers on eBay [Re: y_p_w] #5443688 06/01/20 07:23 AM
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kschachn Offline
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Originally Posted by y_p_w
I thought that the practical way would be to test in an engine against a fuel made with iso-octane and n-heptane. But with that the limit is 100% iso-octane as the reference.

I remember hearing about octane rating rigs that use variable compression ratio engines to test higher than 100 octane. Something like this:

[Linked Image from researchgate.net]

I took a fuels and lubricants class in college and that one looks similar to the one we used.


1994 BMW 530i, 253K
1996 Honda Accord, 289K
1999 Toyota Sienna, 437K
2000 Toyota ECHO, 290K
Re: Electronic Octane Testers on eBay [Re: kschachn] #5443706 06/01/20 07:57 AM
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smonska Offline OP
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Found a few videos online about this model of tester, apparently they don't function if there is ANY ethanol in the fuel, will just read "110". Here in Massachusetts, all gas is E10, so this device wouldn't be practically useful for me in any way. I'd have to drive to New Hampshire for 91 non-ethanol, at an extra $1/gal.

Last edited by smonska; 06/01/20 07:58 AM.

'67 Camaro 327 RT 15w-40
'06 Audi 2.0T GC 0w-40
'99 Honda Superhawk RT 5w-40
'17 Ducati Supersport S 939 RT 5w-40
'19 Ram 1500 5.7 Castrol EP 5w-20
'10 Corvette GS GC 0w-40
'12 Buick Regal GC 0w-40
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