RE: Too much oil.  
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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> RC Fuels >> RE: Too much oil.
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RE: Too much oil. - 4/14/2008 12:58:42 PM   
Lille-bror


 

Posts: 9
Joined: 2/14/2008
From: Frederikshavn, DENMARK
Status: online



quote:


My own experiences indicate that lowering the oil ratio from 18% to 12% has actually resulted in cooler-running engines here. Perhaps that''s because we''ve also changed rom PAG-based synth/castor blend to an ester-based synth/castor blend I don''t know.


Hey Xjet.

Have you tried lowering the oil % in an engine to 12 %, which already have been broken in with 18% oil? Will the engine loose its compression?
I have a TT pro 46 that is broken in, and a Super Tigre GS45 that even after 1,5 liter fuel (5 % nitro, 3 % M and 12 % ML70) is not broken in. For the Super Tigre I have thought of mixing 0 nitro, 3 % M and 9 % Fuchs AeroSynth 2, but I am not sure what to mix for the TT.

(in reply to XJet)
       Post #: 26

RE: Too much oil. - 4/15/2008 9:34:51 AM   
Lille-bror


 

Posts: 9
Joined: 2/14/2008
From: Frederikshavn, DENMARK
Status: online 		Both engines has been broken in with 5 % nitro and 15 % Aerosynth 3 oil - ½ liter (1/8 gallon) each, and then the Super Tigre has been further broken in with 1 liter (1/4 gallon) 5 % nitro, 3 % M and 12 % ML70.

Should you brake in your engine with the same fuel mix, you have planned to use after the break in?

(in reply to Lille-bror)
       Post #: 27

RE: Too much oil. - 4/15/2008 9:46:03 AM   
XJet


 

Posts: 2997
Joined: 3/31/2003
From: Tokoroa, NEW ZEALAND
Status: offline 		Yes, I actually break my engines in using 18% oil and switch to 12% after a few tanks full.

The extra oil *is* helpful during the break-in process as it ensures that there''s a huge margin of additional protection available to allow for the tight-spots that will inevitably exist when an engine is brand-new.

I''ve noticed no loss of compression after changing to 12% from 18%.

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When I'm not here, I'm at RCModelReviews

(in reply to Lille-bror)
       Post #: 28

RE: Too much oil. - 4/18/2008 8:54:33 PM   
Lille-bror


 

Posts: 9
Joined: 2/14/2008
From: Frederikshavn, DENMARK
Status: online
quote:

ORIGINAL: XJet

Yes, I actually break my engines in using 18% oil and switch to 12% after a few tanks full.

The extra oil *is* helpful during the break-in process as it ensures that there's a huge margin of additional protection available to allow for the tight-spots that will inevitably exist when an engine is brand-new.

I've noticed no loss of compression after changing to 12% from 18%.


Thanks for your tips, XJet :-)


quote:

ORIGINAL: rexracer

Interesting discussion. i felt the need to point out one thing that was said concerning motorcycle 2 strokes vs rc cars. When you get off the gas in an rc car (decell) the engine is NOT spinning at high rpm with less oil. As soon as you get off the gas, the centrifical clutch releases and the engine speed drops to somewhere near idle.


Hey rexracer.

That is also what I remembered, when I drove RC-cars. If the clutch were "on" after the gas was taken of, the car would brake, and it dosn't.

(in reply to rexracer)
       Post #: 29

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