Thread: Too much crankcase pressure, novice engine builder

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OK guys-here's the deal---by taking out as much fuel from the tank as possible, it will only take a few gallons to raise the octane level of whats then in the tank!!!!!!It won't be contaminated-------and as the fuels get more to the higher level octanes, you need to richen up the jetting---------the AFR will be different with race gas-------now he hasn't told us anything about his timing except he don't know???????

His higher crankcase pressure at higher RPM levels point to detonation--------ignition timing and jetting/octane is the cure--------

Should I list my qualifications for him??? or would that make me liable for damages???????

Originally Posted by jerry clayton

OK guys-here's the deal---by taking out as much fuel from the tank as possible, it will only take a few gallons to raise the octane level of whats then in the tank!!!!!!It won't be contaminated-------and as the fuels get more to the higher level octanes, you need to richen up the jetting---------the AFR will be different with race gas-------now he hasn't told us anything about his timing except he don't know???????

His higher crankcase pressure at higher RPM levels point to detonation--------ignition timing and jetting/octane is the cure--------

Should I list my qualifications for him??? or would that make me liable for damages???????

Jerry, no one's saying it's not a possible detonation problem, but the guy has said he's running ethanol free 91 octane and would like to keep that as his fuel. With aluminum heads and 10.0 to one compression he should be fine with 91 as far as detonation is concerned, in my opinion and as has been stated often here in the past (TechInspector1 comes to mind). Since "...ignition timing and jetting/octane is the cure--------" that leaves ignition timing and jetting as the options.

Let's not drive another new guy away by refusing to listen to what he's asking and arguing.