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2026. 6. 30. 작업
Is it feasible to Turbo a NA engine while maintaining 87 AKI octane fuel use?
I can get you halfway; here's the formula for the effective compression ratio of a forced induction motor: Effective Compression Ratio (ECR) = sqrt((boost+14.7)/14.7) * Static Compression Ratio (SCR) So, for 5psi on your 9.9:1 SCR motor: ECR = sqrt(19.7/14.7)*9.9 = 11.46:1 However, I have had quite a difficulty trying to find a good way to get ECR to "what octane gasoline do I need", as it seems no simple matter. Some starting reading is here and here . Off the cuff, 9.9:1 seems rather high even for 87 octane, and 11:46:1 seems to be square into the 93 octane range, which I've been told has a usual maximum of 12:1 compression (though again, no simple equation for it). It seems some motorcycles can get away with 14:1 on premium, but this seems not to apply for most cars; it probably has to do with the smaller piston size. As a reference, most turbocharged vehicles use closer to an 8:1 static compression ratio; my Probe turbo used 7.8:1 and I could only get about 21psi on it with pump ga
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2003 Hyundai Santa Fe will start then die. Then it will not start. After pumping the accelerator or holding on the floor and returning later it will start. Nothing codes out. This happens probably 15% of the time. Any ideas?
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A friend has an older Miata that was improperly stored for at least three years. Most of the time, it was not garaged. The gas is old, the battery is dead, it has not been started. It was probably parked without an oil change. He is looking to do the minimum to get this sellable, so the primary concern is the initial startup and the brakes. What would be recommended , especially regarding that first engine startup?
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I am planning to start using seafoam in my gas and oil ,how often should you a add it an how much.The label isn’t to clear about it.
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I’ve asked a few mechanics and DIYers this question and so far no consensus. Let’s say you’re 1000 miles away from next SCHEDULED oil change, and you’re about to leave on a 2000 mile road trip. Would you choose to change your oil 1000 miles early before the trip, or 1000 miles late after the trip?