Measure of the force applied to an object that causes it to rotate.

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24
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6answers
2k views

When is a cold air intake system beneficial?

Cold air intake must be one of the popular mods there is, and one subject to the most controversy as well. Manufacturers of such systems advertise 5-20 HP gains, yet there are claims that this mod ...
19
votes
4answers
2k views

Why would I want to measure torque while loosening a bolt or nut?

An answer to a question asking about torque wrench maintenance mentions to not use a particular kind of torque wrench for loosening bolts. This got me thinking. I would think it'd be preferable to ...
16
votes
2answers
1k views

Should a mechanical “click” Torque Wrench be set to zero when not in use?

I have a standard click torque wrench. I was told I should set it to zero when not using it in order to keep the accuracy high. Is this true? Secondly, I have not been doing this since I purchased ...
15
votes
6answers
707 views

What is the difference between torque and horsepower?

A very basic question - what is the difference between torque and horsepower? Its all over Google, but I am really confused and can't get any satisfactory answers. I'll tell you my confusion: Torque ...
10
votes
2answers
211 views

Horsepower at wheels calculation

I have used Torque Pro App for sometime in my Hyundai i10 Era (2011 model) and it gives me Horsepower at wheels. But the values seems to be much less. To find out the problem, I logged the car OBD ...
10
votes
2answers
1k views

Is double-clicking a mechanical torque wrench just a habit?

I'm wondering if there is any benefit behind double-clicking when using a mechanical torque wrench. Could it be that some folks do it to compensate for slack in the ratcheting mechanism? In other ...
10
votes
1answer
124 views

Computing Wheel Torque From Engine Torque

It seems possible to obtain engine torque and RPM from a truck CAN bus. I'd like to estimate tractive force at the wheels given these two values. How should I go about computing torque at the wheels? ...
9
votes
1answer
763 views

Torque spec variance with Anti-Seize

I see a lot of variances with torque specs when a fastener is lubed with anti-seize. Some places say 25% less torque is required for same clamping load, some places say 40% less is required. I'm ...
8
votes
6answers
525 views

Are there “standard” torque values for fasteners?

For "normal" applications (say attaching the oil pan or valve cover) are there standard or typical torque values for fasteners? I'm wondering if it is possible to use a rule of thumb for those ...
8
votes
3answers
583 views

Does using a ratchet size adaptor on a click-type ratchet wrench reduce the applied torque?

Long story short, I have to purchase a torque wrench which I will use to torque things like brake calipers, wheels and the like. To make things interesting, I will have to buy it a different size ...
8
votes
3answers
5k views

Does accelerating faster worsen fuel efficiency?

I've often heard that accelerating harder makes for bad fuel efficiency, but have yet to be given a sound explanation of why. Naturally this makes me question this advice. Now obviously when you ...
8
votes
1answer
103 views

Where can I get my torque wrench calibrated?

I have a couple of torque wrenches and a torque screwdriver that I've had for some years. None has ever been recalibrated and although they haven't been abused and they seem to have good agreement ...
7
votes
5answers
179k views

What is the meaning of BHP and torque in bikes or cars?

BHP = Brake horse power. It says that it is brake horse power but it is generally relates with high pick up (your bikes reaches top speed in lesser time). So what does this actually mean?. Torque = ...
7
votes
4answers
150 views

“Always Replace” (torque-to-yield) Bolts

I'm working on a VW Jetta and have pulled one of the suspension ball joints to replace a drive shaft. The three bolts holding the ball joint to the lower control arm are marked in the Bentley service ...
7
votes
3answers
2k views

Torque curve on modern turbo-charged petrol engines

How can modern turbo-charged petrol engines have such constant torque plateaus over a broad rpm range. Does the mathematical relationship between torque and power still hold here? This looks totally ...
7
votes
2answers
1k views

Do I need to lift my car up before adjusting lug nut torque?

I recently put new wheels on my car. I don't have off-street parking, much less a garage to work in, so I had the wheels installed by a mechanic. Since they were installed, they have been driven ...
7
votes
1answer
175 views

Will increasing line pressure increase torque capacity?

I was wondering if one were to increase the line pressure sent to the clutch packs/bands on an A/T would that increase the torque capacity of said transmission? I figure it would because it would ...
6
votes
3answers
399 views

Uses of small sized 1/2" drive sockets

I'm currently a first year apprentice and building my tool kit as I go. I see often larger socket sets include 1/2" drive sockets ranging from 8 or 10mm. Is there a reason that 1/2" drive sockets of ...
6
votes
4answers
2k views

How to measure angle when ratcheting a bolt?

The torque spec for my Tacoma says that cylinder head bolts should be torqued (in a specific sequence) to 27 ft/lbs initially and then again each should be turned another 180 degrees in the same ...
6
votes
4answers
5k views

Torque wrench vs regular ratchet

What is the difference between a torque wrench and a regular ratchet that you'd normally use with sockets? When should you use one vs. the other in automotive applications?
6
votes
3answers
85 views

How to lock crank shaft while torquing central screw?

It seems I have to replace the oil seal at the pulley-side of my crankshaft. According to the technical manual of my car, the central screw should be torqued with 120-145Nm. I don't know how much ...
6
votes
4answers
6k views

Aligning a castle nut with a torque spec to a cotter pin hole

The nuts at the knuckle on my outer tie rod ends are castle nuts, which are locked by cotter pins fed through holes in the studs. The nuts also have a torque spec (27.0±2.5 N∙m, in this case). If I ...
6
votes
2answers
273 views

Wheel re-torqueing, how is it done?

When putting wheels back on a car, you place them on and torque them to spec. Now, most if not all manufacturers say to re-torque them after 50 miles. What is the procedure for this? Do you just ...
6
votes
1answer
855 views

Measuring Horse Power and torque without a dynamometer

I know I can take my car to a workshop and have a Dyno Run and can read the HP and torque figures from that. What I want to know, is there an alternative way to know the HP and Torque figures without ...
6
votes
1answer
38 views

On-Board Diagnostics (OBD) Readiness Monitors

I would like to know how does apps like Torque calculate if my car (Hyundai i10 Era) is 'Not ready' yet? What are the factors (complete list) do one checks to decide? Is there any formula to calculate ...
6
votes
4answers
2k views

Why does the power output peak and then drop as engine speed increases?

I have been looking at the power bands for my car (2000 Opel Agila 1.2) recently, as I want to work out when it is best to change gear and stuff, as I have no life! This is the approximate graph I ...
5
votes
2answers
125 views

Increasing rear sprocket size for torque gains, will a dyno tune be required?

In order to get some mid range and torque gains, I've decided to replace my rear sprocket with a bigger one. I asked a friend of mine (experienced motorcyclist, been riding for decades) and he said I ...
5
votes
2answers
621 views

engine underpowered in idle - what can be done to improve a diesel engine power at low RPM just a bit?

There is an engine which is a bit underpowered when idling, it can not even keep the car moving on a flat road when in gear and idling at 700..800 RPM - see link. What can be done to improve its ...
5
votes
1answer
88 views

How can you assure a torque wrench is working properly?

Torquing to a manufacturer's spec is important when working on an engine but I've wondered how do you properly determine if an adjustable torque wrench has been zeroed out over it's life and is still ...
5
votes
1answer
156 views

Lexus RCF - Torque Vectoring Differential, How Does it Work?

I was reading about the Lexus RCF and how it has a torque vectoring differential and how this differential has the ability to put more torque on the outer turning wheels rather than on the inside ...
5
votes
1answer
77 views

What is the general rule, if one exists, for determining the difference between crank horsepower and wheel horsepower?

If a vehicle has a known crank or wheel horsepower rating, is there a method that can reasonably estimate what the other horsepower value should be? If so, what is that method? For example, if a ...
5
votes
1answer
439 views

What is the difference between an automatic torque wrench and a click wrench?

What is the difference between an automatic torque wrench and a click torque wrench? Right now the 1/2inch torque wrench I use on my Jeep is a really cheep one I bought on amazon and it clicks when ...
4
votes
1answer
549 views

Is each turn with a beam torque wrench additive?

If I need to turn a bolt to 50 ft-lb with a beam torque wrench, and I turn it until the needle points to 20, then I need to stop applying pressure for some reason. Do I just apply another 30 ft-lb ...
4
votes
2answers
230 views

Does torque decrease mathematically?

There are 2 cars, car A and car B. Car B is 20% heavier than car A. We all know that this means that these 2 cars will have same power if car B at the same RPM (revolution) has 20% more Nm. Can the ...
4
votes
1answer
104 views

what damage or extra wear (if any) is caused by turning over the engine while in gear (manual transmission)?

While newer cars never allow you to turn over the engine without the clutch depressed, in some older cars, if you do leave the transmission in gear, do not depress the clutch and turn the key, the car ...
4
votes
2answers
149 views

Given the following scenario, what type of engine (diesel or petrol) allows for greater acceleration and/or top speed?

I know this isn't exactly a Motor Vehicle Maintenance & Repair related question but this seems the most appropriate StackExchange community to ask it. I apologize if I am being wrong in my ...
4
votes
1answer
212 views

What is the maximum torque a 1/2 drive can withstand?

I just broke two 3/8 in. extensions trying to crack an underdrive pulley loose (specs say the pulley is at 130 ft/lbs, but feels much higher than that). This begs the question: are there standard ...
4
votes
1answer
177 views

Could 1.9 Nm be enough to accelerate 130kg electric go-kart?

I'll apologize in advance for a fuzzy question. My problem consists of two parts. For starters, I'm trying to buy a DC engine for learning purposes and most of them only specifies the watt (which I ...
4
votes
2answers
77 views

Engine rev in motorcycle

I somewhere read that for a good launch we should hold engine revs at peak torque, not peak horsepower. What does "hold engine revs at peak torque, not peak horsepower" means? How can I hold engine ...
4
votes
2answers
201 views

If I were to convert a gas powered automobile to an electric car, would a difference in specs possibly damage the car?

I would like to convert a Mazda Miata into an electric car, I plan to remove the engine and the gearbox, and have the car be a direct drive. The motor I intend to use has twice the torque of a ...
3
votes
2answers
434 views

Can I use my 1/2 inch torque wrench with smaller sockets?

I have a relatively expensive 1/2-inch torque wrench. Not all of my sockets are 1/2" and many of them are smaller. Is there any problem with using a socket adapter, so I can use my 1/2-inch torque ...
3
votes
1answer
115 views

How do I find out the proper torque number that I need to apply to an oil filter?

I am hearing mixed opinions how much should I tighten an oil filter. Does it depend on car or filter type? How do I find out the proper torque number that I need to apply to an oil filter? Thank you. ...
3
votes
1answer
21 views

Installing Moog stabilizer / sway bar links on 2002 Ford Focus

I am installing both front sway bar links on my 2002 Ford Focus SE wagon. I ordered a pair of "MOOG K80066 Stabilizer Bar Link Kits". They did not come with any instructions, and I am totally new to ...
3
votes
0answers
103 views

Question about Ryobi P261 Impact Wrench Torque

I am planning to buy this Impact Wrench: http://www.homedepot.com/p/Ryobi-ONE-18-Volt-1-2-in-Cordless-3-Speed-Impact-Wrench-Tool-Only-P261/205885687 This Impact Wrench has 3 speeds: 0-2,900 RPM for ...
2
votes
2answers
60 views

Torque reduces gradually after certain RPM

I just know the plain definition of the Torque. Torque: Definied as the force applied to the object to rotate on its axis The torque will be increased only upto a certain RPM and it will gradually ...
2
votes
1answer
104 views

How to measure torque statically?

I am familiar with the concept of torque wrench. However, with a torque wrench, one can only apply a desired amount of torque. Is there a way to measure how much torque has been applied to a certain ...
2
votes
3answers
2k views

What is the torque and sequence for a '99 Jetta Oil Pan?

I have a '99 Jetta TDI (diesel) with a cracked oil pan. I'm looking for the sequence of tightening the bolts and the torque needed for each bolt. I've been doing to google-fu but can't seem to find ...
1
vote
1answer
243 views

Changing gears at what speed? [closed]

Can someone please link me to a website where I can get the speed at which a car must shift gears, (manufacturer wise would be better). Or maybe, link to a website where I will be able to calculate ...
1
vote
1answer
151 views

Engine torque throughput curve is flat or wavy in low gears between 2000 and 4000 rpm

As the title says BMW's (93 E34 525i M50B25TU) engine misbehaves in low gears, namely in 1st and 2nd, most of the time when the engine is cold but sometimes even when it is properly warmed up. The ...
1
vote
0answers
80 views

OBD-II Enhanced PIDs

I was looking at the Torque Pro app and in the section where there is a list of custom PIDs that can be used, one is a Transmission Temperature PID. But it is exactly same as Engine Coolant ...