Recent Topics
Tacky additive in bar and chain oil
by TreyT42 - 03/31/20 05:02 PM
How Come Diesel is $2.69 when gas is $1.47 ?
by LoneRanger - 03/31/20 04:42 PM
Bosch Premium 3422 Cut Open
by getawheel - 03/31/20 03:52 PM
AC Went out in my Forester Again
by Miller88 - 03/31/20 03:48 PM
I'm out on the Front Porch
by MolaKule - 03/31/20 03:11 PM
Raybestos rotors - Element3 vs Specialty Truck
by RageOfFury - 03/31/20 02:39 PM
Briggs Stratton Quantum engine surging
by alex_at - 03/31/20 12:53 PM
Are harbor freight generators any good?
by NavyVet88 - 03/31/20 12:37 PM
Anyone on RD Forum .org? I've been banned
by FADEC - 03/31/20 11:48 AM
A picture of me in my youth! :-)
by SLO_Town - 03/31/20 11:18 AM
5w50 Motorcraft in 6.2L Raptor
by KlenFrappe379 - 03/31/20 11:16 AM
Fast 22 LR
by stockrex - 03/31/20 10:33 AM
Filter size info required please
by Richierich56 - 03/31/20 09:50 AM
Hand Sanitizer 1gallon $36 after code
by Touring5 - 03/31/20 08:49 AM
Trailblazer tire pressures
by zrxkawboy - 03/31/20 06:01 AM
Lincoln MKZ hybrid / Sitting for 6+ weeks
by Ammofirst - 03/31/20 04:01 AM
Megapulse VEE System
by toyota62 - 03/31/20 01:35 AM
If only I had more time...
by 14Accent - 03/31/20 12:34 AM
Newest Members
TreyT42, Abi, Transpections, burgM, SantiagoT
71067 Registered Users
Who's Online Now
105 registered members (atikovi, AC1DD, 2015_PSD, 4WD, Al, 53' Stude, 9 invisible), 2,289 guests, and 21 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums67
Topics303,517
Posts5,235,623
Members71,067
Most Online4,538
Jan 20th, 2020
Donate to BITOG
Print Thread
Hop To
RON Octane Gasoline rating #5360526 02/26/20 10:26 AM
Joined: Apr 2017
Posts: 129
B
Building3 Offline OP
OP Offline
B
Joined: Apr 2017
Posts: 129
The 1966 Mustang owners manual says that the fuel should be 91 RON octane "Regular" fuel for the 2V carburetor and 99 RON octane "Premium" fuel for the 4V. About what are those ratings using today's R+M calculations? I know that the "Motor" rating is lower than the RON, so I am thinking that any 87 or 89 is probably good for the 2V but how about that 99 RON, what pump octane would that be now? Thanks

Re: RON Octane Gasoline rating [Re: Building3] #5360539 02/26/20 10:41 AM
Joined: Dec 2005
Posts: 13,859
K
kschachn Offline
Offline
K
Joined: Dec 2005
Posts: 13,859
99 RON would be approximately 93 AKI (R+M)/2, the current measurement here in the US. I've never seen a pump label distinguish between RON and MON, only the average.

It's as close as you will get here in the US without buying specialty (race) gasoline or leaded aviation fuel.


1994 BMW 530i, 252K
1996 Honda Accord, 288K
1999 Toyota Sienna, 434K
2000 Toyota ECHO, 284K
Re: RON Octane Gasoline rating [Re: kschachn] #5360595 02/26/20 11:34 AM
Joined: May 2005
Posts: 5,066
Y
y_p_w Offline
Offline
Y
Joined: May 2005
Posts: 5,066
Originally Posted by kschachn
99 RON would be approximately 93 AKI (R+M)/2, the current measurement here in the US. I've never seen a pump label distinguish between RON and MON, only the average.

It's as close as you will get here in the US without buying specialty (race) gasoline or leaded aviation fuel.

The scales that are out there are imprecise rules of thumb. Pure iso-octane of course has a RON of 100 and a MON of 100. But in general it's close enough with most pump fuel to have a RON then an AKI octane recommendation.

Re: RON Octane Gasoline rating [Re: Building3] #5360668 02/26/20 01:31 PM
Joined: Oct 2017
Posts: 238
T
thastinger Offline
Offline
T
Joined: Oct 2017
Posts: 238
Research Octane numbers are generally on the order of 10% higher than Motor Octane numbers. This might give you an idea https://vpracingfuels.com/master-fuel-tables/

but I would think the fuel you're trying to buy would have the RON and MON posted somewhere on the website

Re: RON Octane Gasoline rating [Re: thastinger] #5360800 02/26/20 04:36 PM
Joined: May 2005
Posts: 5,066
Y
y_p_w Offline
Offline
Y
Joined: May 2005
Posts: 5,066
Originally Posted by thastinger
Research Octane numbers are generally on the order of 10% higher than Motor Octane numbers. This might give you an idea https://vpracingfuels.com/master-fuel-tables/

but I would think the fuel you're trying to buy would have the RON and MON posted somewhere on the website

The only requirement when sold in the US is the (R+M)/2 rating. It is possible to have a different "spread", and of course there can be different fuels with different spreads being mixed into the same storage tank. They should average out to the same AKI.

Re: RON Octane Gasoline rating [Re: Building3] #5360833 02/26/20 05:12 PM
Joined: Jun 2003
Posts: 35,401
E
eljefino Offline
Offline
E
Joined: Jun 2003
Posts: 35,401
I've heard Research is 4 points higher than (R+M)/2.

Naturally the 4 bbl carb has a more aggressive (compression, cam, timing) engine sitting underneath it than the 2V-- carburetion is only incidental.

Re: RON Octane Gasoline rating [Re: Building3] #5360934 02/26/20 07:37 PM
Joined: Aug 2010
Posts: 2,224
B
benjy Offline
Offline
B
Joined: Aug 2010
Posts: 2,224
looking at the benefits of oxygenated fuels is interesting, kinda why NITRO an oxygen bearing fuel can be burned at such high volumes making OUTRAGEOUS power in top fuel drag racing

Re: RON Octane Gasoline rating [Re: Building3] #5360939 02/26/20 07:45 PM
Joined: Aug 2003
Posts: 14,595
R
Rand Offline
Offline
R
Joined: Aug 2003
Posts: 14,595
Quote
Difference between RON, MON, and AKI
Because of the 8 to 12 octane number difference between RON and MON noted above, the AKI shown in Canada and the United States is 4 to 6 octane numbers lower than elsewhere in the world for the same fuel. This difference between RON and MON is known as the fuel's Sensitivity,[5] and is not typically published for those countries that use the Anti-Knock Index labelling system.


2019 Jeep Cherokee Trailhawk 2.0T
2020 Hyundai Elantra "Value Edition"
Re: RON Octane Gasoline rating [Re: thastinger] #5361405 02/27/20 10:58 AM
Joined: Apr 2017
Posts: 129
B
Building3 Offline OP
OP Offline
B
Joined: Apr 2017
Posts: 129
Thanks for your inputs. As was noted in one post, only the average of R+M is shown on the US gasoline pumps. I did click on the master fuel table link and found that the differences between R and M were from 3 to 15, so quite large differences. Maybe the best thing to do is to experiment. i think I will try the lowest octane and work up until I don't hear and knock/pinging going up hills. Start with 87 for the 2V and 90 for the 4V.

Previous Thread
Index
Next Thread

BOB IS THE OIL GUY® Powered by UBB.threads™