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Everything posted by forester2002s
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Years ago (1960s), I recall that some racing cars had water injection to boost performance. At that time (in my pre-Subie youth) I had a 150cc Lambretta scooter. This had a two-stroke engine, and a very simple carburetor. I remember that the engine performed much better in damp weather; it ran much smoother and seemed to have more power than on dry, sunny days. Not a very scientific piece of info, I realize, but the water did seem to help.
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Be aware that if you lubricate the threads, you may end up with a much higher stud tension than is intended. This is because lubricated threads make it easier to turn the nut, given a specific torque. Or to put it another way, you may be applying the correct torque, but might be overstressing the studs. In the absence of any instructions to the contrary, it is always best to apply a specified torque to CLEAN and DRY threads. My Subaru Factory Service Manual says: - "Fasteners must be tightened to the specified torque. Do not apply paint, lubricant, rust retardant, or other substances to the surface around bolts, fasteners, etc. Doing so will make it difficult to obtain the correct torque and result in looseness and other problems."
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Don't forget that there are 'single-platinum' plugs (with platinum only on the centre-electrode), and 'double-platinum' plugs (with all-platinum electrodes). And that with Subaru's shared firing pattern, a 'single-platinum' plug will theoretically last longer in cylinder #1 than in cylinder #2. Or is it the other way around?
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That's certainly the best way to measure rolling circumference, and can be used to compare several tires, PROVIDING all tires are tested the same way. However, if one tire is not on the car (& cannot be mounted on the car), then a tape measure must be used. In that case, the other tire must be taken off the car and measured the same way with a tape measure. To compare circumferences to within a 1/4" (6 mm), both tires must be measured using the same method. Otherwise the differences in measuring methods can easily mask the 1/4" spread.