Transition mixture screws

[carzxl]

the green oxidation also happened on the bottom of the rubber caps. ???

[koolaid_kid]

Brass is an alloy of copper and zinc. Just an fyi.

[Steve]

Unfortunately here in madison wi the only available non ethanol fuel is premium and thats sometimes a chore to find.

As long as it's less than 10%, don't worry about it. You will use a little more of it to travel each and every mile, but you will spend a LOT less money and will not harm your bike in the process.

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[Turtleface]

The smallest amount of water in your gas can cause you to blow a hole through a valve like a laser beam. I've seen it happen before on a fuel injected car engine from "cheap" gas.

Had a buddy develop a water jacket/cylinder wall crack on a 1/4 mile track duty 383 he had in his Firebird. Of course, it was at WOT, and during a run. The cylinder in question didn't have any holes in the pistons, but it did bend the crap out of his expensive Eagle H-beam rod. Turns out water doesn't compress very well. I've never seen any piston damage from water, I would have thought water in the cylinder would lower combustion chamber temps. At least, that's the idea behind a water-injection system.

[Steve]

I would have thought water in the cylinder would lower combustion chamber temps. At least, that's the idea behind a water-injection system.

Yes, WATER will reduce the temperature, depending on how it's introduced.

Water injection involves spraying some water into the intake. Usually it is done as a very fine mist and far enough upstream so that it can evaporate. The physics behind theh evaporation process tell you that it loses a LOT of heat in the process, that cools the mixture.

However, if you have raw (unevaporated) water that gets into the cylinder, the temperatures there will change it to steam. Steam tries to occupy 1200 times the volume of water. Since there is only so much volume available in the cylinder, the pressure goes up, WAY UP. That is what bent your buddy's rod.

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[Turtleface]

Yes, WATER will reduce the temperature, depending on how it's introduced.

Water injection involves spraying some water into the intake. Usually it is done as a very fine mist and far enough upstream so that it can evaporate. The physics behind theh evaporation process tell you that it loses a LOT of heat in the process, that cools the mixture.

However, if you have raw (unevaporated) water that gets into the cylinder, the temperatures there will change it to steam. Steam tries to occupy 1200 times the volume of water. Since there is only so much volume available in the cylinder, the pressure goes up, WAY UP. That is what bent your buddy's rod.

.

Indeed. Hydraulic lock is a harsh mistress. I was more wondering how water in the combustion chamber would hole a valve like a laser. I wasn't terribly clear in my post, I was talking about piston holes when I was thinking about valve holes.

[davidbailey]

Has any one had a problem removing the fuel/air mixture screws.I removed the caps and have tryed to soak the screws with PB Blaster and even tryed heating them and can't get all of them to loosen.any help out here