Author Topic: High compression  (Read 5406 times)

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Offline kx666

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High compression
« on: October 07, 2007, 03:45:19 PM »
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...

Offline BDI

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Re: High compression
« Reply #1 on: October 07, 2007, 04:40:39 PM »
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:
« Last Edit: October 07, 2007, 05:14:13 PM by BDI »
Smoke every cigarette like It's your last and ride like you stole something!!!

stewart

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Re: High compression
« Reply #2 on: October 07, 2007, 11:58:55 PM »
i have ran as high as 19 to 1  on wiseco ptston but i am running 15 to 1  best all around setup

Offline Arigato

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Re: High compression
« Reply #3 on: October 08, 2007, 01:40:40 AM »
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.

Offline kaw rider

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Re: High compression
« Reply #4 on: October 08, 2007, 03:31:27 AM »
i'm running 15:1 also on stock motor.

Offline kx666

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Re: High compression
« Reply #5 on: October 08, 2007, 03:12:17 PM »
wow.. 19:1 commpression, i am at about 13.5:1 or so, i was told to to go much higher

Offline monster malibu

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Re: High compression
« Reply #6 on: October 08, 2007, 05:14:12 PM »
What's the reason you guys want to run high compression on stock motors? Would my 87 KX500 benefit from high compression?

Offline KXcam22

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Re: High compression
« Reply #7 on: October 08, 2007, 05:47:47 PM »
Are you guys calculating with the piston below the exhaust port or above? Cam.

Offline Danger4u2

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Re: High compression
« Reply #8 on: October 09, 2007, 12:29:59 AM »
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.
KX 500 Rider

Offline Danger4u2

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Re: High compression
« Reply #9 on: October 09, 2007, 12:34:13 AM »
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.
« Last Edit: October 09, 2007, 01:02:40 AM by Danger4u2 »
KX 500 Rider

Offline kx666

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Re: High compression
« Reply #10 on: October 09, 2007, 04:21:44 PM »
i learned about compression when i was young... with fire crackers...this is why my throttle is on the left side  :wink:

Offline FactoryPhil

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Re: High compression
« Reply #11 on: October 09, 2007, 04:51:36 PM »
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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Offline BDI

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Re: High compression
« Reply #12 on: October 09, 2007, 05:10:15 PM »
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.
Smoke every cigarette like It's your last and ride like you stole something!!!

Offline FactoryPhil

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Re: High compression
« Reply #13 on: October 09, 2007, 05:17:59 PM »
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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Offline Arigato

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Re: High compression
« Reply #14 on: October 10, 2007, 01:39:03 AM »
How many PSI is 15:1?