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Jul 19, 2011 18:54:22 GMT
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Why make a large X with tape on your headlights for track days / road-going race-cars? Is it to stop broken glass going all over the track in a collision?
D (for dumb-ass)
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Jul 19, 2011 18:54:55 GMT
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yes
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Volvo back as my main squeeze, more boost and some interior goodies on the way.
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ToolsnTrack
Posted a lot
Homebrew Raconteur
Posts: 4,121
Club RR Member Number: 134
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Daft question amnestyToolsnTrack
@overdrive
Club Retro Rides Member 134
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Aug 17, 2011 16:46:58 GMT
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If i wind back pistons on brake calipers, in particularly twin pots, should i bleed them?
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Aug 17, 2011 23:42:01 GMT
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shouldn't need to
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theres more to life than mpg & to much power is just enough.
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Tim
Posted a lot
Posts: 3,340
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But if the brake fluid has been topped up over the time the pads have worn, it might overflow as you force them back in.
And if your me, drip on your face :X
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Aug 19, 2011 12:15:42 GMT
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A trunnion is a joint usually at the bottom of a kingpin/upright that provides for the suspension and steering movement. Does the same thing a ball joint does but in a more agricultural way. Usually made out of a Copper/Brass alloy. Wishbone pivot bolt/bushes go through that open hole and the steering swivels using an thread on the upright. As the steering is actually on a thread the car will rise/fall a bit as you go fro lock to lock. "Upper Trunnion" is a technical term for shirt potatoes!
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Topping up your oil if you don't know which type of oil is already in your car. OK need to top up my Alfa 2.4 jtd but haven't a clue which or what type of oil is already in it(mineral/semi-synth/full-synth 10/40w ect) will i be ok to use general 10/40w semi-synth as a top up around a liter. Thanks
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The louder you Scream the faster we go
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mk2cossie
Club Retro Rides Member
Posts: 3,028
Club RR Member Number: 77
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Daft question amnestymk2cossie
@mk2cossie
Club Retro Rides Member 77
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Aug 21, 2011 13:57:52 GMT
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Topping up your oil if you don't know which type of oil is already in your car. OK need to top up my Alfa 2.4 jtd but haven't a clue which or what type of oil is already in it(mineral/semi-synth/full-synth 10/40w ect) will I be ok to use general 10/40w semi-synth as a top up around a liter. Thanks 10w40 semi synth should be fine, as thats what they were recommended to use at the dealer i worked for ;D
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Aug 21, 2011 22:18:14 GMT
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Ok bit of a long-winded question, but the basic point is fairly simple....
A friend of mine is a bit obsessed with fuel economy. He saves fuel by never revving above 3K and by sticking to a high gear. Once he was rumbling up a hill, and I told him that even though the engine isn't revving high, because he's in high gear he's using a lot more fuel, as he had his foot down more and the amount of fuel going into the engine is set by the accelerator pedal. He said that his modern(ish) car should be clever enough to work out that it's wasting fuel, and not put so much into the engine. Is he right??
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Aug 21, 2011 22:30:37 GMT
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Throttle will be buried further into the carpet to keep the same speed in a higher gear, so should be using more fuel... If he's that anal about it, I bet he writes down the mileage between tanks. He could try it your way and look for a difference. I'm betting he won't even consider it though.
It's the throttle that controls how much fuel goes in, regardless of revs. Floor it, it's going to dump more in until you back off the throttle.
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All driving instructors here claim that maximal fuel economy is achieved by accelerating to the desired speed as fast as possible, and then driving as steady as possible. I take that as redlining it in each gear until desired speed is achieved
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Aug 22, 2011 12:49:23 GMT
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High gear full throttle doesn't use as much fuel as low revs light throttle. Probably.
The throttle doesn't directly control how much fuel is dumped in - it just controls the amount of air going into the engine as a proportion of the maximum possible amount at a given engine speed (more rpm = more air at Wide Open Throttle [what] = more power).
The fuelling system provides the right amount of fuel for however much air going into the engine - either by careful carburettor design or by the fuel/air map.
If the car is seeing the same amount of power at the wheels in each situation (ie travelling at the same speed and accelerating/decelerating at the same rate) the slower turning engine will be producing (slightly) less power since the frictional losses are lower.
Further, the throttle itself introduces pumping losses - the engine puts quite a bit of power into 'sucking' the fuel/air mix in. In a high gear with more throttle, these pumping losses are lower. This is one of the reasons that diesels are more economical - they don't have a throttle restricting the air intake. Finally, very modern cars are starting to implement fly-by-wire throttles and variable valve timing in an attempt to reduce these pumping losses - at cruise, the throttle is wide open and the power output is managed by altering the valve timing, ignition timing and fuelling.
Since the overall losses are lower, the higher-geared engine will need less fuel/air mix to deliver the same amount of power to the wheels.
Of course, this ignores the alteration in fuel/air mix that is dictated by the mapping - for example light throttle at 3000 rpm (economical cruise) is often mapped leaner than full throttle 3000 rpm (acceleration), which itself is leaner than what at 6000 rpm (full power please-god-don't-melt-mixture). However, since the engine isn't operating at extremes of power in either case the mix is likely to be similar.
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Aug 27, 2011 12:31:35 GMT
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Why are wheels widths still measured in inches, while offset is measured in mm's?
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CIH
Posted a lot
Posts: 1,466
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Aug 27, 2011 19:16:04 GMT
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Why are wheels widths still measured in inches, while offset is measured in mm's? Just the way it is. Rmember tyres are a weird combination of metric and imperial dimensions. Michelin tried full metricin the 1980s (as I'm sure you know) but it didn't catch on.
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Aug 27, 2011 23:07:56 GMT
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Why are wheels widths still measured in inches, while offset is measured in mm's? Because a 9" wide wheels sounds sexier than a 226.8mm wide wheel, but offset and tyre size in mm looks technical ;D
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1989 Peugeot 205. You know, the one that was parked in a ditch on the campsite at RRG'17... the glass is always full. but the ratio of air to water may vary.
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I'd say it's more a combination of old accepted standards and being that awkward country where everyone counts in inches and millimetres ET is an abbreviation of the german for 'inserton depth' but if you look at many American sites, you'll still see reference to 'backspacing' instead. And it'll be measured in inches.
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...proper medallion man chest wig motoring.
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Aug 28, 2011 10:20:30 GMT
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I'd say it's more a combination of old accepted standards and being that awkward country where everyone counts in inches and millimetres ET is an abbreviation of the german for 'inserton depth' but if you look at many American sites, you'll still see reference to 'backspacing' instead. And it'll be measured in inches. I gotta say, I find the concept of backspacing much easier to understand. Less calculations= less chance of me getting it wrong!
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1953 Minor (Long term project) PT Cruiser
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Sept 4, 2011 21:58:53 GMT
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I've got fairly new wiper blades but in the rain the first wipe or two makes my screen sort of greasy looking instead of clearing it, is this normal? The screen itself is quite old and has a couple of chips and delamination (saving for a new one). Screen wash makes little to no difference and I keep the screen clean.
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Sept 4, 2011 22:05:04 GMT
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Try cleaning the wiper blades with some water and soap? Probably, they are bit greasy.
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Click picture for more
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Sept 4, 2011 22:08:12 GMT
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I had not thought of doing that (and feel just a little bit stupid for not thinking of doing that). Shall give it a try tomorrow, thank you.
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