No problem either. Using higher octane doesn't heat up the engine , on the contrary , it is better because uses less fuel for same performance. As i said before , the only problem is that you might experience knocking effect is middle or higher rpms with full throttle and thats because your ignition timing is set for leaded gas. Adding 1 degree will fix that but this is something that it is better configured by an expert with a timing gun.
As for leaded or unleaded engines, one of the problems was that engines used to consume leaded engine didnt have adhesives on the metal of the valves because lead was lubricating them. With the use of unleaded , those adhesives were no longer in existence so valves were worn quickly. Boxer engines though had already hardened valves so the had no problem using both types of gas.
Sprint 1.7 '85
Last edited by Greek; 07-01-10 at 08:34.