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Tractor Pulling Discussion Forum

how much comp for 110 octane

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unknown puller

10-05-2005 18:40:33




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if ive got a four cylender engine with a 4 inch bore and a 3.60 stroke with 185 psi comp what type of fuel will give me the most power 110 or pump gas or ethenol blended




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ChadS

10-06-2005 13:07:40




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 Re: how much comp for 110 octane in reply to unknown puller, 10-05-2005 18:40:33  
E85 will help HP, and solve your octane all at once. Mix it with at least 90 octane pump gas, if you get the mixture right, youll pick up alot of power from the fuel. Depending on your rpm range, mix 1 gallon of pump gas to 1/2 gallon of E85 for 185psi. at that mix, you can fire well over 220 psi and not have problems with spark knock. E85 acts just like octane booster, its very hard to ignite by itself, thats why you mix the pump gas with it. JMHO. Chad

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unknown puller

10-06-2005 17:36:51




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 Re: how much comp for 110 octane in reply to ChadS, 10-06-2005 13:07:40  
so your saying pump gas chad how does rpms make a diference say if im running 1500 rpms 2500 rpms or 2950 rpms were would you need more octane acording to your rpms any one else feel free to coment .



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John T

10-05-2005 20:30:28




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 Re: how much comp for 110 octane in reply to unknown puller, 10-05-2005 18:40:33  
Puller, electricity is more my thing, but I gotta agree with the Case man on this. The reason high octane fuel is used is cuz its harder to ignite, but is necessary in order to prevent pre ignition. HOWEVER if you use higher then required its harder to ignite and you could end up getting less horsepower. The way to look at it is higher compression is what yields more HP (NOT the fuel you burn) and the higher compression requires harder to ignite (higher octane) fuel. But any octane over that then diminishes the desired HP gains.

I can say fer sure as compression increases it takes more voltage to arc jump the same spark plug gap and thats why one needs a higher voltage coil and usually a higher current rated switch (i.e. electronic over points) to handle the coils current.

Someone please confirm or shoot down my octane theory, otherwise until then "Thats my story n Im stickin to it"

John T, retired electrical (sure not mechanical) engineer

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G/MAN

10-06-2005 07:33:40




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 Re: how much comp for 110 octane in reply to John T, 10-05-2005 20:30:28  
That's absutely correct. Octane is the measure of a fuel's ability to resist ignition, and it's necessary to raise octane when raising compression in order to keep the fuel from being ignited by the heat of compression, instead of waiting for the spark.



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CASEPOWER

10-05-2005 19:01:07




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 Re: how much comp for 110 octane in reply to unknown puller, 10-05-2005 18:40:33  
Pump gas, the lowest octane possible as long as you don't have any spark nock from pre-ignition.



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unknown puller

10-05-2005 20:14:49




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 Re: how much comp for 110 octane in reply to CASEPOWER, 10-05-2005 19:01:07  
thats up 40 psi from my stock comp of 140 psi why do u say lowest octane im running electronic ignition 3 ohm coil bigger vaves milled head your opinion would i gain more horsepower from lower octain fuel would this give me more lugging ability



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G/MAN

10-06-2005 07:31:49




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 Re: how much comp for 110 octane in reply to unknown puller , 10-05-2005 20:14:49  
As CP said, going too high on the octane will likely COST you power, not make more. The higher the octance, the higher the resistance to ignition. Guys running around burning 110 in their near-stock "performance" tractors are shooting themselves in the foot, and in the pocketbook.



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CASEPOWER

10-05-2005 20:31:01




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 Re: how much comp for 110 octane in reply to unknown puller , 10-05-2005 20:14:49  
Lower octane fuel fires much easier then high octane. Octane numbers are raised by dopes (additives) to make it harder to ignite so you don't get preignition from high compression. Your cylinder pressure of 180 really means nothing. Your timing is different, cylinder wall thickness, cylinder temp., and many other things is different from another engine with the same cylinder pressure. Try 110 octane on the dyno, then run 93 and I would be willing to bet the 93 gives more power with no spark knock at your compression.

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Shaggy

10-05-2005 22:07:01




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 Re: how much comp for 110 octane in reply to CASEPOWER, 10-05-2005 20:31:01  
What about a mixture of the 2 fuels? I heard people that mix the leaded fuel with unleaded and claim it make more power. Is it BS?



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SMA in NE

10-06-2005 21:34:20




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 Re: how much comp for 110 octane in reply to Shaggy, 10-05-2005 22:07:01  
I think you also get less power out of a gallon of ethanol compared to a gallon of gasoline. Less btu's in the ethanol. The only way you gain is more compression as already said on this thread.



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jd b puller

10-07-2005 14:55:57




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 Re: how much comp for 110 octane in reply to SMA in NE, 10-06-2005 21:34:20  
SMA - yep, there's less BTU's/LB in Ethanol than in Gas. But, if you push more of it in there (bigger jets), you can make more power. I've never tried Chads potion he speaks of. Probably works, but I've always run Cam2 or TurboBlue in pulling tractors.



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ChadS

10-07-2005 11:14:37




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 Re: how much comp for 110 octane in reply to SMA in NE, 10-06-2005 21:34:20  
Your exactly correct. Ethanol, by itself is so hard to ignite, its like running 150 octane fuel. If you had no compression to help, it will be like running kerosine. But, you dillute the Ethanol, with something that will burn, lets say pump gas,, you will create a fuel, that cools, controls your octane, and make power. Mix Ethanol with pump gas, taking away its abitliy not to burn, and it will burn and make more power than the 10 dollar a gallon race gas. For about,,, well add in todays fuel prices,,,, bout 3.50 a gallon. Chad

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