Hot answers tagged

75

tl dr: Kwik Fit is full of crap. It's good to rotate tyres (and tires, too :o). The entire idea of rotating tires is to keep the wear relatively similar (or even), front to rear. If rotation is done at the specified intervals, the only time you'll have a weaker tire of appreciable wear is when it's time to replace all four. I don't know what the end goal ...


49

Just thought it was an interesting topic, so googled around a bit for actual sources. First of all, some (or maybe all) BMW's actively recommend NOT rotating tyres. Cartalk covered this in one of their shows, and here are the most notable quotes: TOM: We've always felt that tire rotation is of marginal value in terms of saving you money. Why? Because the ...


15

They're used - you can see the marks on the center where they've been attached to a wheel. They also look scored - run your fingernail across those scatches; if you can feel the ridges, it needs resurfacing. Have a look at a few Youtube videos on installing and cleaning new rotors, and you'll see what a new one looks like. Basically, it'll be in a plastic ...


15

Obviously I'd recommend taking your car to the track and avoiding this kind of behavior on public roads. With that said, as long as you're not doing it for prolonged intervals, and you're only doing it on wet pavement, there won't be too much abnormal wear caused by occasionally hanging your tail out. Reagrdless, I would recommend attending a local autox or ...


13

From advanced-auto-maintenance.com: It’s widely acknowledged by automotive engineers that most engine wear occurs within this first ten minutes of driving before the engine has reached its highest, normal operating temperature. From bloomberg.com: When you first start the vehicle, do not race the engine. Accelerate gradually until the engine (and the rest ...


12

You always fit the best tires on the rear. Why? They don't motor*, don't steer and barely brake - why can't rear wheels just be casters? The rear tires are your rudder They keep your car from spinning out. To be technical, they provide stability in yaw, and they don't steer, so vertical stabilizer is more correct. Ever seen those on the front of an ...


10

When your engine is cold, the gasoline is less likely to evaporate and create the correct ratio of air and vaporized fuel for combustion. Engines with electronic fuel injection have sensors that compensate for the cold by pumping more gasoline into the mixture. The engine continues to run rich in this way until it heats up to about 40 degrees Fahrenheit. ...


9

For the majority of brakes, they should be fine after a track day, but the real risks come from significantly overheating the brake fluid, or from stopping with hot brakes and having them cool while parked. This is why at track days it is always recommended that you stop after ten or so laps, if you have standard brake systems, to allow your brake fluid and ...


9

Pulling the hand brake without pushing the button has no effect on the service life of the parking brake. The only thing that will wear is the ratcheting lock mechanism, and I doubt you could wear it out. The purpose of the button is to release the locking mechanism. These are typically simple tooth and claw ratchets.


8

When you are traveling 20-30 mph, shift into high gear (6th IIRC) and push the gas 1/2 to 3/4 of the way down. If you see the RPM rise with no immediate increase in speed, the clutch is worn to the point that it is slipping. The amount of time between slight slippage and total failure is usually not very long. For a higher power car, you can expect to ...


7

In a manual tranmission car, the clutch is 'meshed' only when both sides of the clutch - the engine side and the wheel side - are running at the same speed. Downshifting Example I'll make up some numbers for an example: Say you're at 3rd gear, going 45 miles an hour and the engine is at 2.5k RPM. If you downshift while still going 45 miles an hour, the ...


7

wear is increased at engine start When you have no oil pressure and you start the car, that is when the most wear occurs on your bearings. Crank bearings in most cars are not roller bearings anymore. They are called plain bearings and rely on hydro-dynamic lubrication. Here is answer related to crank bearings with illustrations so you can understand ...


7

fuel injected vehicles don't require a crazy amount of fuel to get started, in terms of fuel economy alone anything over 30 seconds should be safe (although we are talking about levels of fuel only eco-modders care about). If you are concerned about wear, there's no good way to tell which is better. If you change oil regularly I wouldn't worry about the wear ...


7

There are 3 key factors to work on when uprating for higher revs: Moving parts Spinning a rod, cam or flywheel faster than it is rated for will result in it destroying itself, often spectacularly, as the stresses become too much. Moving linkages and pistons back and forth also takes a lot of energy - Kinetic energy = 1/2 m v squared, and it is that squared ...


7

Check with the tyre manufacturer. If anyone would know, it'd be them - not a shop full of work experience kids. When rotating tyres, move the fronts to the back, and the backs to the front on the same side. Do NOT cross-rotate them; that can cause premature wear. Why is the UK different? Because of consumer expectations driven by marketing. In the UK, I ...


6

Since you're asking specifically about a conversion van, and the mileage on both is relatively low, I'd say in this case age is going to be the most important. There are not enough miles on either van to cause any significant mechanical issues. Age on the other hand will "wear out" rubber components, electronics, and most importantly for a van it will have ...


6

I guess finished means completely outworn. This sounds like a seized caliper on that side, which always brakes a little and so wears the pads. It does not have to brake that much that you notice it, but typical signs are a hotter wheel on the one side compared to the other side after some (especially fast) driving and a wobbling noise which often occurs ...


6

The rev limiter would have to be removed. This would be involved in a custom DME. With the limiter removed then you'd be able to blow it up if you wanted to. To support the higher revs, the vehicle would need the engine internals worked on. Stronger camshaft(s), valves, valve springs. (Head work). Depending on the strength of the rotating assembly at the ...


6

Are there any other precautions that I should take when using snow chains? Not really ... what they give in the instructions are spot on. DO NOT exceed the 40mph or vehicle damage will ensue. You can also lose control of the vehicle if running faster than recommended. Running chains on bare roadways will cause damage to the road surface. Why can't I use ...


6

No not at all, the horn is not gonna get damaged. My old Nissan Maxima once had a faulty hood lock switch and the alarm went off during night. The alarm was on for almost all the night and the horn was honking too, I knew it the next day when there was a notice hanging on my apartment door.


6

My experience, limited to a few very specific configurations is: I've never had rotor warping issues even after a LOT of heat in the brakes (both from track days and also stuck brakes while driving on the express way). I've used generic NAPA rotors, OEM rotors, and fancy heat/cryo treated ones. I can't tell any difference between any of them. They all ...


6

Your final thought is correct. Only 1 calliper was faulty. You said it that the pads on the faulty calliper had even wear, which indicates that the slider mechanism was not seized. The piston on the faulty calliper was clearly seizing out and not freeing the pads when the brake was released. If this had been on the front wheels you would likely have felt ...


5

"Blipping" the throttle just means giving it a very short (half a second) stab raising the RPM for a short time. It creates smoother down shifts because it raises the RPM to where it's going to be after the shift so the synchros have less work to do.


5

That's a broad question, and I'm a Subaru geek, not a VAG geek, but I'll share my never-humble opinion. Any flash that increases performance obviously increases stresses. A proper remap with careful logs and monitoring might improve the longevity of any performance enhancement. Then again, you never get something for nothing (despite the billion-dollar ...


5

Spark plug cables can suffer from a few different things: cumulative heat stress from being near the engine cumulative electrical stress from the high voltages they carry chafing against nearby things Normally, I inspect them whenever I replace the plugs. Look for cracks or breaks in the outside insulator, damage to the boot, and if you have a multi-meter ...


5

The ideal method requires a moderate level of mechanical skills. There is a tool available (small block Chevy oil pump primer) that turns the oil pump with out cranking the motor over. The distributor is removed, the tool is essentially a distributor shaft with most of the parts missing. The end of the tool turns the oil pump which circulates the oil through ...


5

I agree with the accepted answer by @HandyHowie, but here is a heads-up: watch that new caliper, and check its temperature against the others in a few days and again in a few weeks. Here's why: sometimes a caliper just seems to be defective when the real culprit is the brake hose serving that caliper. The internal lining of the brake hose can collapse and ...


4

I base my decisions on several factors when purchasing used vehicles. I research the history of the vehicle to see if at any mileage interval the vehicle has reported issues. Another issue would be if you can even get parts at the parts store or would you have to go to a junk yard. Last, what are the insurance premiums on either vehicle based on the ...


4

Uneven tire wear is typical caused by improper tire pressure, misalignment or both. It is unusual for all the issues to be located a one specific axle. There may be a number of things going on or one major thing causing many issues. The brakes wearing unevenly is not common, but could be result of being improperly installed to faulty pad material. I would ...


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