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mrmako777

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  1. dumb question but..

    in Tech and Tips

    Posted

    No, not really, I wouldn't think so... the drag strip is clicking it up through the gears on a quick sprint. Not even a mile's worth of riding on the engine... yea, it was a hard mile, but it has a chance to cool between rounds.

    The idling in traffic, the 30 miles to and from the track are a lot more harsh on the engine than a quick pass down the track. I usually filled the tank with the 'good stuff' before riding to the track, making my passes, and riding back on the same tank... then I'd fill it back up with 87 if I knew I wasn't going to the drag strip the next week.

    I'll keep looking for it, but I don't think I'll find anything that backs up my thoughts, I think I'm SOL.

    Lastly, it may make a slight difference whether you run regular or premium gasoline. Why? Regular 87 octane gasoline actually has a higher heat content per gallon than premium 93. This means that the 87 will actually burn hotter and possibly a bit cleaner than the 93.

    http://www.midsouthvw.com/TechTips/tech_tip_SootyPlugs.htm

    Carbon build up is common and will cause pinging. So will "hot spots". A properly running engine designed to burn 87 octane fuel will in fact make more torque burning 87 octane vs. 93 octane. Higher octane fuel burns slower and colder while requiring hotter ignition to combust. A lower octane fuel will burn quicker and hotter and not need as much heat to start the combustion process. This is why higher octane fuels resist detonation (or pinging). The reason you experience more power with the higher octane is because it is resisting detonation and firing at the right time (expanding and pushing the piston down). When you run the lower grade fuels, the air/fuel is igniting too quickly and the impact of the force applied on the piston is at or a hair past TDC. Think of it as a bicycle. When you push on the pedal with your foot, you push as the pedal goes down. If you push when the pedal is at its highest point or just after, its extremely hard and not very productive. This is what is happening in your engine.

    Before someone says "if higher octane fuel burns colder and slower than why would race cars use it". This is because of the extreme cylinder pressure. Pressure creates heat, and when used with lower octane fuel, that heat would pre-ignite the fuel and you have detonation and soon a trashed engine. Likewise, you can advance the igntion when running higher octane fuel because it burns slower.

    http://therangerstation.com/forums/showthread.php?p=311588

  3. dumb question but..

    in Tech and Tips

    Posted

    I'll admit I'm no gas expert so I could be wrong too. Much of this was observation when I was riding the old 'cane.

    The higher octane is a slower burn (better for high compression, higher heat engines), the slower burn retains more heat in the cylinder and through the block than 87 octane as it thermodynamically dissipates.

    This effect may be negligible or I may just be talking out my ass, but I know my stator wire melted after I switched from 87 octane on the street, to 92 octane for drag racing. I know I read it somewhere (I usually don't draw conclusions about things unless I know for a fact what the cause is, or someone else has had a similar issue and wrote about it) that that was the cause - but looking up info now, I can't find anything to back it up. :dunno:

    its always been my understanding that the faster gas burns the more heat it creates. look it up tho man id be interested to see, but im pretty sure it does not create more heat. you were prolly running the motor alot harder drag racing than you were on the street, no?

  5. dumb question but..

    in Tech and Tips

    Posted

    But note that if your manual says 87, you can use higher, but the higher the octane - the more heat that's generated.

    now i could be wrong but how did you come to the conclusion that higher octane gas generates more heat when its more resistant to detonation than 87? :dunno:

  21. DE-OXY-DOES-IT for a chain?

    in Tech and Tips

    Posted

    replace it.

    you should be cleaning/lubing your chain every 500 miles, and every time you hit rain/puddles to prevent this.

    I don't think you need to replace it necessarily just because it has some rust. Depends on how bad the rust is tho. The best cleaner you can use is kerosene and a toothbrush then slap some maxima chain wax on. No fling with the chain wax!

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