RCU Forums - OS 50 Hyper and 30% nitro

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- - OS 50 Hyper and 30% nitro (https://www.rcuniverse.com/forum/o-s-engines-support-133/10045533-os-50-hyper-30%25-nitro.html)

impulse09

10-03-2010 09:10 PM

OS 50 Hyper and 30% nitro

Does the .50 hyper require head shims to run 30% nitro? I went from 20% to 30% today and coincidentally fried my engine. I reset the needles to break in settings and that didn't keep it from happening.

Bax	10-04-2010 09:16 AM

RE: OS 50 Hyper and 30% nitro

You may need to either reduce compression or lengthen a tuned exhaust system or both. Going to higher nitro fuels means that the engine needs a lower compression ratio or retarded timing to operate correctly.

impulse09

10-06-2010 07:21 PM

RE: OS 50 Hyper and 30% nitro

Any advice on the best way to "reduce compression" since the owner's manual doesn't mention the need to?

Bax	10-07-2010 08:58 AM

RE: OS 50 Hyper and 30% nitro

You add head gaskets to reduce compression. Usually adding one more is enough.

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