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Cox TD 010 and TD 020 Performance

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Cox TD 010 and TD 020 Performance

Old 10-14-2021, 04:00 PM
  #1  
Pkram10
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Default Cox TD 010 and TD 020 Performance

Hi there,
Looking for some input into what RPMs I should be seeing for Cox TD 010 and TD 020. Both engines have the larger Cox Intl aluminum tanks, and are used, but appear to be in good condition. I'm running Cox 3 x 1.25 and 4.5 x 2 props, respectively. For the TD 010, I've tried 2 head gaskets and Sig Champion 25% Nitro with oil increased to 23% (60/40 castor/synth). I'm getting 20,300 RPM peak (Cox indicates 27,500 RPM for peak). I intend to try a 3rd head gasket and Sig 35% nitro fuel.
For the TD 020, I started with 2 head gaskets, and Sig 25% fuel, then added a 3rd head gasket, and tried both fuels, 25% and 35%. The peak RPMs didnt vary by much, 17,400 to 17,600 (Cox indicates 19,500 RPMs for peak).
Any suggestions on what I can do to improve RPMs?
Peter
Old 10-17-2021, 07:50 PM
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BMatthews
 
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I've only used them with the one head gasket it was designed to use. And generally 1/2A and smaller fuel was always 15 to 25% nitro and I never saw any issue from using 25% nitro with the single gasket.

As a result I'm thinking that you might just not have enough compression ratio to get the RPM you're after.
Old 10-18-2021, 05:52 AM
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Pkram10
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OK, I'll try them with only 1 head gasket. I'm also thinking that the piston/rod connection needs to be tightened up with the reset tool. Too loose and the RPMs apparently drop.

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