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Octane Rating Needed?

T

TXFlyGuy

Well Known Member
For you RV guys with high compression ratio engines, what is the minimum Octane Rating that you need?

High compression being 10.7-1.

As we have found a good source for 91E0 fuel, just wondering if that would cause any detonation or preignition issues?

We wish to avoid 100LL as much as possible.
 
And specifying the actual engine.

If it's an a/c engine with giant bores & sub optimum combustion chamber shape, you probably will have problems. If it's an automotive engine with optimized combustion chamber shape and an engine controller that monitors air/fuel ratio & knock sensors, and manages mixture & timing, it might not be a problem at all.
 
The engine is a LS376/480 Chevy. Max rpm will be limited to 4500, which equals 400hp at sea level.
Seems like GM says 92 Octane is recommended.
 
Well, if you're using the factory (street rod/international) controller, you've got your answer. :)

I think we've covered this before, but in addition to numerous Lyc drivers, a *lot* of alt engine guys just use pump mogas, even with ethanol. The aluminum tanks and fuel lines are fine with it, so as long as you're using teflon lined flex line, you should be good to go.
 
rv7charlie said:
Well, if you're using the factory (street rod/international) controller, you've got your answer. :)

I think we've covered this before, but in addition to numerous Lyc drivers, a *lot* of alt engine guys just use pump mogas, even with ethanol. The aluminum tanks and fuel lines are fine with it, so as long as you're using teflon lined flex line, you should be good to go.
Click to expand...

Yes, similar topic visited before. Thanks for your input!
 
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