Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

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Old 03-10-2006, 12:15 AM
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jbel
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Default hey cp

how did you mod your k&b 6.5? would like to raise exhaust timing on mine.need to know what tools were used an how to de-bur inside edge of exhaust port
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Old 03-10-2006, 11:34 PM
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Default RE: hey cp

jbel, you'll need a diegrinder with fine toothed carbide rotary files. The other tool is a degree wheel and a scribe so you can mark your cut line. I don't remember what the gain was from just raising the port, if I remember correctly I did all the reccommended mods at the same time, including a hit or miss rebalancing after the piston and rod were lightened.
It's hard to say if these mods will ever pay off, the bench runs were impressive, but the engine started belching black smoke and lost power last time I ran it........haven't taken the time yet to see what is wrong.
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Old 03-11-2006, 12:18 PM
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my main concern is the chrome pealing off ! hope thats not what happend to yours.i have the front rotor version and rear rotor version,the rear rotors exhaust is almost twice the size as the front rotors . the front rotor is the one i want to modify .any suggestions,parts sources.ect... would a big help. thanx john
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Old 03-11-2006, 06:55 PM
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Default RE: hey cp

That's a real possibility [peeling], I won't know at least until tonight.
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