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Jan 15, 2010 19:50:44 GMT
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leaf springs do have some advantages over coils, but the extra weight and space they take up outweighs them, Ford used slipper springs on some of the escort/cortina rally cars, these are leaves that have no locating eye at the front, instead the end is flat and slides between rollers, as the axle is no longer located by the spring they used 4 links running forwards to the body and a panhard or watts linkage to locate it sideways.
mainly done to keep within class regs it worked really well and allowed the axle to run upright turreted shocks and be be set up for anti squat, anti tramp, etc etc.
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Volvo back as my main squeeze, more boost and some interior goodies on the way.
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bxer
Part of things
Posts: 457
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Jan 15, 2010 20:00:59 GMT
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^^ dwell angle is the amount the crankshaft rotates between the points opening and closing in the distributor. You measure it with an automotive multimeter, then set the points based on what the meter says. If you are lucky, there is an adjustment hole so you can set the points gap with the engine running (rover v8 springs to mind) Being pedantic here ;D, isn't dwell the time the points stay closed? The idea being that while the points are closed, the current flowing through the coil generates a magnetic field. Once the points open, the field collapses 'cos there's nothing to keep it there, and as it collapses, it changes back to electricity in the secondary (output) coil of the coil. Because the secondary has thousands of times the number of turns of the primary, that electricity becomes a really high voltage (but really low current) all ready to head through the dizzy and jump the gap of the next plug. As mentioned, as long as there's enough of a gap, and the dwell time is correct, then the actual gap isn't important.
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Jan 15, 2010 20:16:51 GMT
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^yes. duh... it is. open and closed the wrong way round (doing 3 things at once...lol) proves I'm actually writing the answers and not wiki-ing it anyway I have one for you all to answer anyway. Why is a brake servo called a servo (when it isn't actually a servo at all)
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To get a standard A40 this low, you'd have to dig a hole to put it in
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Jan 15, 2010 20:22:42 GMT
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Leaf springs (when set up right) can work very well in drag racing. Simple can be good.
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1937 Austin Street Rod - 1941 Wolseley Not Rod - 1956 Humber Hawk - 1957 Daimler Conquest - 1966 Buick LeSabre - 1968 Plymouth Sport Fury - 1968 Ford Galaxie - 1969 Ford Country Squire - 1969 Mercury Marquis - 1970 Morris Minor - 1970 Buick Skylark - 1970 Ford Galaxie - 1971 Ford Galaxie - 1976 Continental Mark IV - 1976 Ford Capri - 1976 Rover V8 - 1994 Ford Fiesta
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Jan 15, 2010 20:22:57 GMT
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It isnt? i thought a servo was a device that took a movement added some extra muscle and then put out the same movement but with more force? (sorry for the non technical description, i know what i mean.)
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Volvo back as my main squeeze, more boost and some interior goodies on the way.
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Jan 15, 2010 20:32:34 GMT
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no, thats just an amplifier. a true servo can adjust its operation based on its position.
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To get a standard A40 this low, you'd have to dig a hole to put it in
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Daft question amnestyBenzBoy
@benzboy
Club Retro Rides Member 7
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Jan 15, 2010 20:43:40 GMT
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Similarly, shock absorbers shouldn't be named such, as the component which absorbs the shock is the spring. ;D
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Jan 15, 2010 21:01:47 GMT
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no, thats just an amplifier. a true servo can adjust its operation based on its position. I'm none the wiser. lol do you mean it can vary the extra power it adds during its movement rather than just giving a constant boost?
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Volvo back as my main squeeze, more boost and some interior goodies on the way.
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markbognor
South East
Posts: 9,968
Club RR Member Number: 56
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Daft question amnestymarkbognor
@markbognor
Club Retro Rides Member 56
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Jan 15, 2010 21:05:06 GMT
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Could I drill a little hole on the side just down from the top of my sealed dampers (actually a mcphearson strut) and drain out the oil. Could I then replace with a heavier weight oil and fill the hole with a small screw and rubber washer seal.
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Jan 15, 2010 21:06:52 GMT
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aaahhh.... lol
ok, a servomotor has 2 parts, one is the motor (which moves) and the other is a sensor that reads the position of the motor. That way you can tell it to move, but only this far..
A brake servo amplifies the pedal pressure using a vacuum and bellows arrangement. No position reporting or feedback, straight linear relationship between input and output.
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To get a standard A40 this low, you'd have to dig a hole to put it in
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Jan 15, 2010 21:09:06 GMT
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Could I drill a little hole on the side just down from the top of my sealed dampers (actually a mcphearson strut) and drain out the oil. Could I then replace with a heavier weight oil and fill the hole with a small screw and rubber washer seal. I know a man who does this.. seems to work in a low-tech temporoary fix sort of way. Shockers on old bikes often have a "top up" screw anyway... Just make sure it's not a gas damper before you drill the hole, lol.
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To get a standard A40 this low, you'd have to dig a hole to put it in
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markbognor
South East
Posts: 9,968
Club RR Member Number: 56
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Daft question amnestymarkbognor
@markbognor
Club Retro Rides Member 56
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Jan 15, 2010 21:14:19 GMT
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Cool. Though I don't suppose telling weather they are gass filled or not is that easy if you don't know what brand they are.
Will using spherical/rose joints at either end of a panhard rod on a beam axle on the rear of a small car cause a huge ammount of noise/vibration in the passenger compartment, or is it likely to not be that noticable.
I may as well get 'em all out of the way!
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BiAS
Club Retro Rides Member
Insert witty comment here
Posts: 2,230
Club RR Member Number: 147
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Daft question amnestyBiAS
@cheeqi
Club Retro Rides Member 147
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Jan 15, 2010 21:32:47 GMT
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As SOC says Mark, yes you can put heavier oil in oil dampers, just make sure they're not gas. And yes spherical/rose joints will increase noise transference to the cabin, removing rubber and having direct contact always does, it's just by how much. Even polybushes or harder rubber ones increase noise/vibration. The advantage is that the removal of the squishiness in stock bushes keeps the suspension geometry more accurate in cornering etc.
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(car+wheels)-rideheight=WIN
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robg2
Part of things
Posts: 815
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Jan 15, 2010 21:34:41 GMT
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I believe that the twin dual circuit is that diagonally opposite wheels are on the same circuit that way if you get a leak on one circuit, you can stop slightly safer. The two circuits will come from the Master Cylinder or the Servo so you will only get one line to each wheel. At least, this is my understanding of it - I stand to be corrected though! Rysz. That's right, dual circuit is the safety concept that provides two individual brake circuits from master cylinder down to the brakes. It's normally a 'diagonal' setup in which front left and rear right brakes are connected together and vice versa, but it can be both fronts and both rears connected together instead. The configuration depends on the vehicle weight and brake sizes. Occasionally (early Metro, Rolls Royce Silver Shadow etc) there's a layout where one piston of each front cyclinder is connected together, as are the other piston at the front and those at the rear. The safety benefit is significant if you consider that the most likely brake system failure mode is a fluid leak due to pipe or hose failure, but it doesn't protect against pedal / pedal box failure or certain master cylinder failures. Nonetheless a 'half system failure' as its know (when one circuit fails) is still an unpleasant event as the pedal travel is drastically increased, and in a car without ABS it's easy to lock the remaining brakes when braking on only one circuit. The regulations to which brake systems are designed actually defines how hard you can brake before such wheel lock occurs. For motorsport cars (especially rallying), people modify the setup to make sure that the configuration is: both rears connected in one circuit and both fronts connected in the other. The reason is that an additional valve can then be added which allows the front to rear brake bias to be varied, or a hydraulic handbrake to be added. The downside to this is that the master cylinder is designed according to the original circuit split, and it won't necessarily work in a failure condition if the setup is changed. That's normally overlooked though. So... What's a banded rim? And what's a tubbed arch?
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purplevanman
Posted a lot
Way too orangey for crows
Posts: 3,829
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Jan 15, 2010 21:59:09 GMT
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So... What's a banded rim? And what's a tubbed arch? I know one banded rim is a wheel that has been cut around its circumference and a "band" of steel welded back in making the wheel wider, usually done on the front on the wheel to give a deep dish Can be seen here AFAIK tubbed arches are where the inside on the arch is cut off and a band welded in to make the arch wider inside the car, I guess narrow axle is then used so you can fit really wide rubber without sticking outside the car
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Dom
Part of things
Limey
Posts: 617
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Jan 15, 2010 23:23:56 GMT
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Thanks for the gear explanation Blown Imp. I'll have to read that again when I'm more awake.
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Jan 15, 2010 23:42:58 GMT
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Since I've spent most of this week playing with carbs (and failing)
What is a venturi?
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...proper medallion man chest wig motoring.
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10mpg
Club Retro Rides Member
Posts: 4,253
Club RR Member Number: 204
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Daft question amnesty10mpg
@10mpg
Club Retro Rides Member 204
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Similarly, shock absorbers shouldn't be named such, as the component which absorbs the shock is the spring. ;D That's why in this country they're called dampers... Since I've spent most of this week playing with carbs (and failing) What is a venturi? a venturi is simply an narrowing in a cylinder/tube or similar passage to increase the air/fluid speed and thus drop the pressure at that point this is used in things like carbs and spray guns as the area of low pressure generated by the faster moving/low pressure air/fluid sucks in the fuel or paint or whatever your trying to suck up! the disadvantage is that there is an impediment in the way reducing the overall flow, which is where the term choke comes from in carburettors as with a flap you increase this low pressure and effectively 'choke' the engine making the fuel/air ratio very rich... Hmm sort of makes sense..
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Last Edit: Jan 16, 2010 0:10:22 GMT by 10mpg
The Internet, like all tools, if used improperly, can make a complete bo**cks of even the simplest jobs...
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Daft question amnestyBenzBoy
@benzboy
Club Retro Rides Member 7
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Similarly, shock absorbers shouldn't be named such, as the component which absorbs the shock is the spring. ;D That's why in this country they're called dampers... And maybe why in the US a servo is called a brake booster - maybe a more accurate name? ;D I've seen them referred to as shock absorbers, shocks or shockers by garages, even by large chains, displayed on their signage. Wrong term I know, but I don't think it's limited to the USA.
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Since I've spent most of this week playing with carbs (and failing) What is a venturi? a venturi is simply an narrowing in a cylinder/tube or similar passage to increase the air/fluid speed and thus drop the pressure at that point this is used in things like carbs and spray guns as the area of low pressure generated by the faster moving/low pressure air/fluid sucks in the fuel or paint or whatever your trying to suck up! the disadvantage is that there is an impediment in the way reducing the overall flow, which is where the term choke comes from in carburettors as with a flap you increase this low pressure and effectively 'choke' the engine making the fuel/air ratio very rich... Hmm sort of makes sense.. Makes perfect sense. Thanks
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...proper medallion man chest wig motoring.
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