Questions tagged [measurement]

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High-side, low-side pressure readings slow to equalize after turning AC off

I was helping a friend yesterday with their E53 X5's AC system when I noticed this strange behavior: Before turning the AC on for the first time both high-side and low-side pressures read the same ...
2
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1answer
777 views

Measuring crank and rod journals

Does anyone have any pointers for mic'ing main bearing and rod journals? My engine has all of the main caps cast as an integral part of the lower block so I can't see how I can reliably use ...
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0answers
71 views

Antilock braking system

The brake pedal of my friend's Nissan Terrano becomes spongy for short period of time while braking over bumps and the braking doesn't seem to slow down the vehicle for a short time.Braking under ...
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1answer
1k views

How do I find the width of a car? [closed]

Is there any statistics about the average widths of cars?
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0answers
221 views

Alignment Measurements after hitting a curb

I hit a curb with my front right tire. I hit with an angle and with 25-30 Miles per hour speed. I took my vehicle to an auto pair, and surprisingly they told me that nothing is bent or damaged. They ...
6
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1answer
172 views

How to measure a vehicles wheel bolt pattern?

How can I accurately measure a vehicles wheel bolt pattern, regardless if it is a car or truck? Are any special tools needed? Is there a certain process to measuring a pattern?
4
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1answer
482 views

When getting rotors turned should the thickness be exactly the same throughout?

I have to drop off my rotors to an auto parts store that does rotor turning in house and I wondered when I pickup my rotors and check it's thicker than the minimum thickness from the manufacture ...
11
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1answer
2k views

How does a dynamometer work?

I don't have much to add here. Pretty simple. How does a dynamometer work? How are Horsepower and Torque measured as separate figures during a single dyno run? There are quite a few components and ...
15
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1answer
1k views

Dynamometer Question - How is it operated and what are they doing?

When guys are doing dyno runs they to do it in a gear, interact with the keyboard and then do it again in another gear. It seems they do multiple runs in multiple gears. In this post Paulster ...
2
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1answer
106 views

How can I empirically evaluate the condition of my used motor oil at home?

I changed my oil recently, and my careful scientific observation led me to discover that it was black and a bit runny. Not clear golden like new oil, but neither tarry sludge like a haven't-serviced-...
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1answer
1k views

How to find the diameter of an automobile inner tube

I'm trying to determine the diameter of several automobile inner tubes (ranging from compact cars to semis); as in the diameter within the tube itself (possibly the "width", or even circumference of ...
2
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1answer
56 views

Converting Cylinder Compression Specs to Inches of Vacuum

If I have the specifications for cylinder compression can I convert that to how much intake vacuum the engine should be pulling? For example, if I have a 4 cylinder engine that is supposed to have ...
7
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1answer
94 views

In a clip, what does the “Stem Length” mean?

I am currently trying to find replacement fender clips for my car. The OEM part numbers are 01553-09321 (Nissan), 90044-68320 (Toyota), and MR328954 (Mitsubishi). I have the hole size (7.7mm), and ...