Questions tagged [torque]

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

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29 votes
7 answers
20k 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 ...
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23 votes
5 answers
5k 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 ...
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  • 1,195
17 votes
3 answers
2k 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 ...
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  • 3,595
16 votes
6 answers
4k 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 ...
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  • 1,511
16 votes
4 answers
21k 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 ...
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  • 1,036
13 votes
6 answers
9k 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 ...
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  • 39k
12 votes
6 answers
6k views

Why tighten down in a criss-cross pattern?

I believe almost everyone working on a car in any capacity has heard this, many things should be tightened down in a criss-cross pattern. Why? What is the rationale behind it? I can imagine several ...
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12 votes
4 answers
14k 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 ...
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  • 243
11 votes
5 answers
543k 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 = ...
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  • 365
10 votes
5 answers
3k views

Can I use a 15lbs torque wrench for 13lbs spark plug job

My civic has 100,250 miles and the service came up for the spark plugs. B124, I am reading and it says after replacing the plugs to torque it to 13 Lbs. The only torque wrench I have is minimum 15 LBS....
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  • 133
10 votes
3 answers
24k 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 ...
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  • 1,755
10 votes
5 answers
21k 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 ...
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  • 1,413
10 votes
2 answers
6k 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 ...
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  • 1,511
10 votes
5 answers
20k 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 ...
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  • 6,515
10 votes
2 answers
1k 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? ...
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9 votes
3 answers
3k views

Torque wrench or impact gun on large bolts

For very large bolts (example: axle nut) I often see mechanics just use an impact wrench, typically they let it "rattle" a certain time and then they consider the bolt tightened. Is this also common/...
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  • 7,828
9 votes
6 answers
6k 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 ...
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  • 14.3k
9 votes
2 answers
3k views

I stored my click torque wrench in a mid-high setting. Is it ruined?

It's an EPAuto 1/4" drive 20-200 in-lbs. I stored it at mid to high setting, and it stayed that way for months, unfortunately. Is it now significantly off from calibration?
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  • 211
9 votes
1 answer
5k views

What fasteners should not be loosened using an impact wrench, and why?

Which bolts and other fasteners should not be loosened using an impact wrench? For example, I've heard that it's not generally recommended to loosen spark plugs with an impact. Nor is it recommended ...
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  • 700
9 votes
2 answers
8k views

Impact sockets with a Torque wrench reduce accuracy?

So I have read that impact sockets are generally made of Chrome Molybdenum and are supposed to be a little softer so they can absorb the impact of an impact gun, whilst Chrome sockets are harder and ...
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  • 716
9 votes
2 answers
7k 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 ...
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  • 2,827
8 votes
4 answers
5k 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 ...
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  • 14.3k
8 votes
3 answers
16k 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 ...
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  • 203
8 votes
3 answers
11k 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 ...
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  • 213
7 votes
5 answers
55k 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 ...
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  • 6,371
7 votes
2 answers
546 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 ...
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  • 143
7 votes
3 answers
42k 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 ...
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  • 6,997
7 votes
2 answers
2k 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 make ...
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  • 4,081
7 votes
1 answer
6k 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 ...
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7 votes
2 answers
2k views

25Nm vs 28Nm - How accurate should a torque wrench be?

I am soon doing a coolant change on my car, including draining the coolant from the block using the drain plug, and I have heard of a few people apparently snapping these off due to over torquing them,...
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6 votes
9 answers
35k 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 it feels much higher than that). This begs the question: are there standard ...
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  • 289
6 votes
4 answers
31k 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?
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  • 6,371
6 votes
3 answers
3k 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 ...
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  • 456
6 votes
3 answers
4k views

Why do service manuals specify a range for torque? Are there any reasons for being at one end or the other?

The service manual for my vehicle specifies torque for most nuts and bolts in ranges. Are there any reasons to be at the lower or higher end of the range, or somewhere in between? Different expected ...
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  • 255
6 votes
3 answers
22k 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 ...
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  • 8,926
6 votes
1 answer
2k 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 ...
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  • 163
6 votes
2 answers
1k 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 ...
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  • 1,334
6 votes
2 answers
2k 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 ...
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  • 1,195
6 votes
1 answer
1k 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 ...
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  • 32.8k
6 votes
2 answers
509 views

How to re-torque a partially loosened overhead camshaft?

While doing a timing belt service on my 17 year-old, 57K-mile truck (DOHC), I was having a very hard time getting it to let go of the front oil seals on the intake camshafts.1 I eventually realized ...
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5 votes
1 answer
582 views

How many times can you go through a torque sequence when installing heads? I'm worried I messed up and should try again but don't wanna make it worse

2002 Ford Escape Cylinders 123 456 Rear Bolt Order (see picture below) 8426 7135 Front Bolt Order 7135 8426 Torque Sequence 1 30 ft lb 2 tighten 90 deg 3 loosen 360 deg 4 30 ft lb 5 turn 90 deg 6 turn ...
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5 votes
2 answers
567 views

Torque specification thread lubricant best-practice as specified by manufacturers

I've been working recently from a Honda service manual. There are, of course, torque specifications documented for various fasteners used throughout the vehicle. I cannot find, however, any mention of ...
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  • 153
5 votes
2 answers
6k 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 ...
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5 votes
2 answers
420 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 ...
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  • 6,371
5 votes
1 answer
1k 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 ...
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  • 1,557
5 votes
2 answers
279 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 ...
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5 votes
1 answer
120 views

Digital torque adapters minimum setting

I'm considering purchasing a digital torque adapter, so I can measure torque with my current ratchet wrenches. I find it curious that almost all the adapters have a minimum setting of around the 20 ft/...
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  • 3,296
5 votes
1 answer
182 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 ...
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  • 1,511
4 votes
1 answer
698 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 ...
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4 votes
3 answers
503 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 ...
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