Mixing 114 and 93 to make 100 octane gas?
11-05-2003, 11:55 AM
#1
Nordschleife Master
Thread Starter
Join Date: Oct 2001
Location: Mount Pleasant, South Carolina
Posts: 7,568
Likes: 0
Received 4 Likes
on
3 Posts
Mixing 114 and 93 to make 100 octane gas?
What do you guys think of mixing leaded 114 Octane ($5.18 per gal) with unleaded 93 Octane ($1.75 per gal) to acheive 100 Octane gas for track use?
I have an '87 930 putting out 346 rwhp and have always used 100 Octane for insurance on the track.
By going with this method of blending, I can save about $50-60 per tank over straight 100 costing $5.50 per gal at the track.
Any Pos or Negs to be had? TIA
Jim
I have an '87 930 putting out 346 rwhp and have always used 100 Octane for insurance on the track.
By going with this method of blending, I can save about $50-60 per tank over straight 100 costing $5.50 per gal at the track.
Any Pos or Negs to be had? TIA
Jim
11-05-2003, 12:17 PM
#2
Racer
Join Date: Jun 2003
Location: CO
Posts: 497
Likes: 0
Received 0 Likes
on
0 Posts
Unleaded gas kicks ***, it's the best. BUT, mixing it to get what you want means you need more than just a 5gal. canister. So you would want to invest in a 55 gal. drum and pump for your garage. I just mixed 110 or 112 with 91 (really 89-90) to make sure I have 93+ so I just have a 6 gal. canister that's good for 2 tank fulls. Sounds like it would be worth the extra trouble to mix it yourself even though you would be burning the gas to the track.
Brent
Brent
11-05-2003, 05:58 PM
#3
RL Technical Advisor
Jim:
I would NOT used leaded gas in anything unless it was absolutely required. What a huge mess on valves, pistons, chambers, turbine wheels, you name it.
Its not worth it unles you are over 1.3 bar and over 8:1 CR.
Lastly, its very challenging to get an even homogenous octane blend unless you have a way to accurately mix the two kinds of fuels well. I understand the economics at work here, but getting the SAME octane in each and every tankful is more important, given the consequences here.
I would NOT used leaded gas in anything unless it was absolutely required. What a huge mess on valves, pistons, chambers, turbine wheels, you name it.
Its not worth it unles you are over 1.3 bar and over 8:1 CR.
Lastly, its very challenging to get an even homogenous octane blend unless you have a way to accurately mix the two kinds of fuels well. I understand the economics at work here, but getting the SAME octane in each and every tankful is more important, given the consequences here.
11-05-2003, 09:58 PM
#5
Nordschleife Master
Thread Starter
Join Date: Oct 2001
Location: Mount Pleasant, South Carolina
Posts: 7,568
Likes: 0
Received 4 Likes
on
3 Posts
I left out that I don't have a cat or O2 sensor on my first post.
As far as mixing, I was planing on using 5 gal fuel jugs of 114, then pumping in 10 gals of 93. My thought was that it would mix in the tank quickly. I would do this each time I reach a certain level and knew I had room for 15 gals.
Please tell me this works, as I have nine 5 gal fuel jugs with 114 in my truck getting ready to go to VIR tomorrow!
As far as mixing, I was planing on using 5 gal fuel jugs of 114, then pumping in 10 gals of 93. My thought was that it would mix in the tank quickly. I would do this each time I reach a certain level and knew I had room for 15 gals.
Please tell me this works, as I have nine 5 gal fuel jugs with 114 in my truck getting ready to go to VIR tomorrow!
11-06-2003, 12:27 AM
#6
RL Technical Advisor
Hi Brent:
I suppose I date myself when I mention what a mess that leaded fuels make. I've used that stuff in everything I'd driven-raced since 1962 and it was THE only thing to use until about 1978 and the avent of higher octane unleaded fuels.
Once you tear down & inspect a bunch of engines using leaded fuels, you'll see the hard, layered deposits left all over the valves, pistons, chambers, spark plugs, and on turbine wheels. It fouls plugs, sneaks the CR ever higher, creates hot spots that trigger pre-ignition and unbalances turbine wheels turning up to 125K RPM.
LOL,...That is hell on turbo bearings and shortens their life.
Its all in what you need. For high-output 935 engines, leaded race fuels are a necessity to keep them out of detonation but those get rebuilt every 25-30 hours.
Its just my opinion but I would not use leaded gasolines unless you have no other choice and you are able to deal with the consequences without difficulty, both operationally and financially.
Unleaded racing fuels at 104 octane are readily available (Sunoco) and are the preferred "brew" for street 930's unless you are over 600 HP or on single ignition and 500+ HP.
I suppose I date myself when I mention what a mess that leaded fuels make. I've used that stuff in everything I'd driven-raced since 1962 and it was THE only thing to use until about 1978 and the avent of higher octane unleaded fuels.
Once you tear down & inspect a bunch of engines using leaded fuels, you'll see the hard, layered deposits left all over the valves, pistons, chambers, spark plugs, and on turbine wheels. It fouls plugs, sneaks the CR ever higher, creates hot spots that trigger pre-ignition and unbalances turbine wheels turning up to 125K RPM.
LOL,...That is hell on turbo bearings and shortens their life.
Its all in what you need. For high-output 935 engines, leaded race fuels are a necessity to keep them out of detonation but those get rebuilt every 25-30 hours.
Its just my opinion but I would not use leaded gasolines unless you have no other choice and you are able to deal with the consequences without difficulty, both operationally and financially.
Unleaded racing fuels at 104 octane are readily available (Sunoco) and are the preferred "brew" for street 930's unless you are over 600 HP or on single ignition and 500+ HP.
