KX Riders
Maintenance & Technical => KX500 Original => Topic started by: kx666 on October 07, 2007, 03:45:19 PM
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who is running the highest compression on the stock bottom end?
i talked to some one who said they were running 15:1 on the stock bottom end..i dont beleave him...
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my bike is 15:1. whats not to believe? I plane to back it down to 10:1 when I run the hydrogen peroxide injection. :lol: :lol:
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i have ran as high as 19 to 1 on wiseco ptston but i am running 15 to 1 best all around setup
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i have ran as high as 19 to 1 on wiseco ptston but i am running 15 to 1 best all around setup
What would that be if you converted it to pounds? I'll test mine tonight.
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i'm running 15:1 also on stock motor.
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wow.. 19:1 commpression, i am at about 13.5:1 or so, i was told to to go much higher
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What's the reason you guys want to run high compression on stock motors? Would my 87 KX500 benefit from high compression?
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Are you guys calculating with the piston below the exhaust port or above? Cam.
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What's the reason you guys want to run high compression on stock motors? Would my 87 KX500 benefit from high compression?
They run the high compression so only the owner can start the bike. Less likely to get your bike stolen, the thief won't know about the high compression. Thief hurts his leg/ankle, no stolen bike and thief can't run away. Better chance of catching him.
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More compression = more bang = more power.
With more compression you will have to run a higher octane fuel. The more compression the greater chance of pre detonation or knocking. Detroit Diesel engines fire because of compression. No intake valves, no spark plugs Air is forced into the cylinder from the blower through the intake ports. As the piston compresses the air the fuel injector atomizes the fuel right before Top Dead Center. The high compression creates heat. Combined with the atomized fuel, it fires. Most diesels have very big starters and big batteries to combat the high compression. To shut them down you cut the fuel supply. Most of the giant motors we had on the drilling rigs I worked on had air starters. With an air starter you can crank and crank and not worry about running the battery down or burning up the wiring.
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i learned about compression when i was young... with fire crackers...this is why my throttle is on the left side :wink:
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They run the high compression so only the owner can start the bike. Less likely to get your bike stolen, the thief won't know about the high compression. Thief hurts his leg/ankle, no stolen bike and thief can't run away. Better chance of catching him.
Hahaha. Nice one dude! I needed a good laugh tonight!
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If I catch some one trying to still my bike I'm going to be pissed because I do not like digging holes or dragging bodies.
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Yup, plenty of easy diggin' sand out here in the desert. Rule of thumb....don't f**k with KX500's!
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How many PSI is 15:1?
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that would vary some with port timing and ring seal but 230 or so
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Are you guys calculating with the piston below the exhaust port or above? Cam.
The right way in my opinion and even almost the whole "twostroke-world" is when piston close exhaustport and start begin to compress.
(Look at Kawasaki manual:Low rpm/exhaust porttimes low(KIPS)/more compression) :wink:
High rpm/exhaust porttimes high(KIPS)/less compression
As always: just my 2 cent :-D
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doordies right i was giving total from 86 by 86 to my 35cc chamber
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At some point when the pipe starts working the theoretical compression ratio will become the actual ratio. It is best to build the engine based on the theoretical ratio. If you build the engine based on the exhaust port hight what you think is a safe compression ratio will become astronomicaly to high when the engine comes on the pipe.