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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › Any detonation issues on OS55HZ on 30% CY Blend?
01-19-2010 12:19 PM  8 years agoPost 21
airdodger

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Johnston USA

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How about you need to open the needles more with a higher percentage oil in the mix, because you now have less combustible methanol and nitromethane.

Chris

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01-19-2010 03:14 PM  8 years agoPost 22
CoronaL

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Winnebago IL

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no
my outrage 30% nitro has 24% oil blend, but it's very thin viscosity. I have to close/lean the needles quite a bit to get the motor tuned correctly. My Wildcat 30% has 23% multiviscosity blend, but needs to be richened quite a bit. So I believe it's the viscosity of the oil/fuel overall that influences the needle settings more, vs the %

Randy!!! I am the liquor

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01-19-2010 03:27 PM  8 years agoPost 23
Twrecks600

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Round Rock, Texas

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this is why I told "jsenicka" to try a Hotter Plug, plus if he is running richer because of the cold weather a Hotter Plug will stay lit in those Richer Settings,,
So essentially, a hotter plug in cold weather is optimal and when the weather warms up, go to maybe an 8? It was 30-40 here in Texas for a while but now the temps are getting back up in the 60-70's so I should probably go back to the 8.

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01-19-2010 09:55 PM  8 years agoPost 24
airdodger

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Johnston USA

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We don't what the viscosity of the initial oils are, add to that one may be going by weight the other by volume. The lower weight oil will have less internal drag on the engine, (one reason you can lessen the fuel intake), it will also thin quicker the higher the temperatures elevate.
This also has a tuning effect, as well as the oil being almost non compressible. There is also a steady state and a transient state that has different fuel requirements. I think this is not that simple an answer. Oils effect the the engine but never to the extent the combustible product effects the outcome. The thinner oil can not carry away as much heat as a thicker oil so you introduce less fuel generate less heat and the engine is happy again. The thicker oil will carry away more heat so you can run more combustible product each stroke.

Chris

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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › Any detonation issues on OS55HZ on 30% CY Blend?
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