im gonna be installing a 48ida with a RB header and pre silencer and i am pre mixing, i was wonder what octane should i use

thanx

 

Lowest ocatane available. Spending $$ for high octane is of no use for a rotary unless you have a high compression turbo and want to prevent detonation.

I used 87 in my 12a for many years. All the higher octane stuff does is prevent knock or pre-detonation--rotarys don't have a problem with that.

 

there is another recent post "what gas should i use" that explains exactly why high octane is bad for non turbo rotaries.