as the car got me there & back on a single tank. ![]() I kept a bottle of STP Octane booster handy (Speed 97 is not available in Jaipur), but didn't have to risk filling there. the car averaged 18.6 kmpl (tankful to tankful). as well as a constant 100 kph on the highway. With intermittent use of the AC & some crowded city streets (around the Hawa Mahal). I did a recent day trip to Jaipur (on a full tank of 97). It pulls away cleanly without knocking, and less downshifting needed. But the best part is the very smooth power delivery. The car gives about 16.3 (tankful to tankful calc) in the city. ![]() Now, that its getting cold around here I don't use the AC that much. But for the past 2 months, I've shifted to Speed 97 (It's a tad expensive, but worth it!). and managed to get 14.5 kmpl constant in the city (Delhi) with the AC on (all summer). ![]() Till very recently I used to use only Speed 93 in the car. RON of an engine totally depends upon CR when car is out from factory there after with carbon accumulation this rating goes up to maintain the performance. So when we use higher octane fuel in our used car we feel slight increase in performance.Īpart from this aspect stock compression ratio do come into picture.Car is designed with certain specific CR which support certain octane rated fuel to give maximum benefits.Trend is upward now.So we see more higher CR cars demanding more octane rating. Now ths phenomenon gets into equilibrium at certain octane level.Means octane demand is saturated at certain level.This is different for different cars of same model & make. Lets understand how octane rating affects engine performance.We all know as kilometers being added in new engine deposites stars accumulating on pistons,valves & combustion chamber.This is almost unavoidable.A dirty engine there after needs more octane fuel in order not to knock then the normal one.Put it simply octane rating of an older engine(higher deposites) is simply more then the cleaner engine.So say a clean engine with octane reating of 87 may function well till it gets accumulation of carbons & there after it starts demanding higher octane to perform well. Once the trans is out of the truck, it should be obvious where the problem is.How does high octane improves performance? Regardless of what has failed, the transmission has to be removed to access the clutch, flywheel or transmission internals. If so, you have a failed bearing between the transmission input and output shaft.Īctually, it really doesn't matter. The viscosity of the lubricant in the transmission will make the rear wheels spin weakly in neutral when the engine is idling, but I assume you mean that the wheels were locked to the engine in neutral. However-you say that the transmission was engaged even in neutral. When that bearing fails, it tries to spin the tranny input shaft even when the clutch pedal is depressed and the transmission and drivetrain are supposed to be disengaged from the engine. Specifically, the transmission input shaft goes through the center of the clutch disc and into a bearing at the center of the flywheel. The next most likely scenario is a bad pilot-shaft bearing. Oftentimes, a poorly adjusted clutch, or even a disintegrating clutch disc, can cause difficulty changing gears. If you need proof, swap two injectors, and the fouled plug will follow. I'll bet one of them is wet with fuel-and that's your bad injector. Crank the engine for a few seconds and immediately shut it off. Then park it for 2 hours or so, until it cools off and you know it will be hard to start. Run the car for long enough to get the engine hot. Does the oil smell like unburned fuel? It's likely that the dripping fuel is washing past the rings and into the crankcase. Cranking with the throttle open makes the excess fuel dissipate quicker.Ĭheck the dipstick. ![]() If you wait long enough before trying to restart, the extra fuel evaporates. There are two tipoffs that this is the problem: the rough running until the wet plug dries off and starts to contribute, and the fact that waiting a half-day or more lets the excess fuel dissipate on its own. After you tease the engine to life on the other three cylinders, the extra fuel evaporates and then the plug starts firing. In spite of your assertion that the injectors don't leak, this sounds like a leaky injector is fuel-fouling one cylinder.
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