Boost / Fuel Octane Figures

[BlgsRX-1mtn]

Well I just talked to our lab tester. He said he could not test the fuels because our Knock Engines are not set up to run that high of compression to determine the octane above 95. I asked how we certified our av-gas and he said it is all shipped to a lab in Houston TX for certification. The only thing our lab checks is, dye strength, cloudiness and vapor pressure

Sorry guys, it looks like that plan got shot in the arse.

Jim

 

[woodsrider]

RATS!!!! Just when I was geting excited. Maybe we should pool our resources ($) and send some off to Texas.

 

[BlgsRX-1mtn]

RATS!!!! Just when I was geting excited. Maybe we should pool our resources ($) and send some off to Texas.

That would work if I knew the person in Texas. If our ASTM engines would have worked, I could talk the guy into doing it here because I know him personally. Technically the lab equipment is supposed to be for company purposes but he would have ran them on a weekend day when the bosses are all gone.

Jim

 

[supercat]

There is a LOT of good and bad info on octane boosters available today. Basically, if you do not need additional octane for your engine to run correctly, don't add it. In most cases, running more octane than you need will slow down the combustion process, and make less power - there are exceptions to this rule. If you want to run more compression and timing advance, then you may need more octane to make more power.

Race fuel is an expensive option, either running it added to pump gas, or by itself. Commercial Octane boosters usually use toluene and xylene as the major ingredients, and cost MUCH more than buying the same stuff in the paint section of your local hardware store.

below are some links that I think are informative:

Toluene FAQ - http://elektro.cmhnet.org/~charlie/phot ... luene.html

Home Brew Octane Boosters - http://www.vtr.org/maintain/gasoline-octane.html

Popular Hot Rodding article 1998 - http://www.ducatimeccanica.com/gas.html

Combustion controlling additives - http://www.syty.org/archives/syty/9807/msg00545.html

TK-7 - http://www.bndautomotive.com/page/page/931760.htm

www.pitstopmarine.com


Nitroparaffins (nitropropane, propylene oxide, peric acid, acetone) can
also produce octane increases and power gains, but when used in high
concentrations will severely lean-out the engine. Propylene oxide will
produce about a 3% power gain at a 5% concentration in gasoline, and has
been known to get by fuel checks. TK-7 products contain nitroparaffins,
among other active ingredients.

 

[FourIsMore]

Hi, Iam a new member sort of my son is master of faster we run my rx1 on ten pounds of boost all day on 91 to 94 or premium gas and I have about 800 miles on that way. I tried to run 13 lbs of boost on 91 to 94 octane and burned my motor up for it I would say your numbers are on the money

 

[obr]

Has anybody tested the knock sensor from Parker?
I sent him some e-mails and I would really like to test it.

How much boost have you guys ran on your sleds, with stock pistons?
I got my new fuel pump tody, wich is good for 300+ hp, but MCX says you have to run on racefuel, therefore I wonder how much boost you guys run on Premium? I rode 12 PSI all winter NO probs.

 

[Jack_Shaft]

Hi, Iam a new member sort of my son is master of faster we run my rx1 on ten pounds of boost all day on 91 to 94 or premium gas and I have about 800 miles on that way. I tried to run 13 lbs of boost on 91 to 94 octane and burned my motor up for it I would say your numbers are on the money

Good to hear, thanks!

My goal is to run a 10psi trail mauler that can survive indefinitely on premium fuel. What headgasket are you running? 2 x stock Yamaha?

-JS

 

[Sheriff]

Make sure you are comparing apples to apples, there are different ways to Measure "Octane"
1. Motor Octane
2. Research Octane
3. Research Motor Combined (R+M/2)

Most Retail Gasoline Dealers use #3.
Av Gas (100LL) is not measured the same, it uses #1.

This can be very misleading for most.
I am in the fuel business & sell all fuels from regular to 100LL to Jet Fuel. I will try to post a link to compare the 3 ways of measuring. General rule of thumb is
Regular 87 (Min)
Mid Grade 89 (Min)
Premium 91 (Min)

P.s. don't forget that elevation also plays a big part to all of this

 

[FastAction]

I was running 12/13lbs on premium , 14/16lbs mixing 50/50 premium and c12 and now running straight c12 on 18/20lbs with stock rods and pistons with three stacked yammi gaskets. No problems yet. I do have a parker knock sensor to install for this year.

 

[RX1DERFULL]

100 LL

I am planning to use 100 LL at sea level to 1001 ft for a stage one MPI system using the 22 / 26 gears to drive the charger at about 11 -11 PSI on a 100% stock 2003 RX-1 engine. Has anyone out there tried this combo??

Should I be worried about engine problems??

 

[HAMMER]

Note that octane isn't the only consideration. Jetting (air fuel ratio), engine coolant temperatures, intercooler temperatures, and the SC oil temperatures also figure into the equation. It won't be any problem at all as far as octane goes if all of these are normal. If one of these goes beyond reasonable limits you could have problems. DO NOT exceed 10,000 engine rpm with the 22/26 pulleys (12lbs boost) it will over-temperature the entire system on a long pull.

 

[RX1DERFULL]

100 LL

The weather conditions will be approximaterly 15°C. The jets are stock size at 135 mains (no air/fuel gage installed). I am running 1/4 mile (1320 ft). The pull will last 10 seconds maximum. Engine coolant temperature will be 180°F max at the end of the run (including the return trip). The return trip is usually at around 4 - 5000 RPM.

I don't think that any of these numbers are unreasonable.

Your Thoughts "HAMMER" ???

 

[HAMMER]

DO plug checks then...don't tempt fate...the rest is fine.

 

[ryan7]

Make sure you are comparing apples to apples, there are different ways to Measure "Octane"
1. Motor Octane
2. Research Octane
3. Research Motor Combined (R+M/2)

Most Retail Gasoline Dealers use #3.
Av Gas (100LL) is not measured the same, it uses #1.

This can be very misleading for most.
I am in the fuel business & sell all fuels from regular to 100LL to Jet Fuel. I will try to post a link to compare the 3 ways of measuring. General rule of thumb is
Regular 87 (Min)
Mid Grade 89 (Min)
Premium 91 (Min)

P.s. don't forget that elevation also plays a big part to all of this

Thanks Sheriff. I run straight 100LL and I have heard the different methods of rating octane levels with AV gas. So in comparison to pump fuels and even racing fuels; what is the octane level of 100LL? I have been trying to get the spec sheet from the airport and they tell me it is minimum 100 octane but that is on the av scale.

Thanks

 

[HAMMER]

Tuesday, 31 January 2006

The following results were compiled by Intertek (fuel testing service)

OBJECTIVE:

To establish the RON (research octane number) and MON (motor octane number)

MON number is a better indication of fuel quality because it is more representative of high rpm, high load, conditions. The closer the RON and MON are the more stable the fuel is.

METHOD:

Use of CFR research engine with variable compression.
All test work carried out to ASTM D2699/D2700 standards.

RESULT:

100LL (Avgas) 100.5 MON and 103.2 RON (101.5 AKI)
91 premium unleaded 86.7 MON and 95.8 RON (91.2 AKI)

75% Avgas + 25% premium unleaded 92.9 MON 101.5 RON (97.2 AKI)
50% Avgas + 50% premium unleaded 91.6 MON 100.3 RON (95.9 AKI)
25% Avgas + 75% premium unleaded 88.5 MON 98.8 RON (93.6 AKI)

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SEE THIS THREAD: http://www.ty4stroke.com/viewtopic.php?t=48520