Questions tagged [measurement]
21 questions
15
votes
1 answer
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 explained how dynamometer functions.
I would like to…
DucatiKiller
- 32,976
- 22
- 150
- 267
11
votes
1 answer
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 there is a component that provides resistance to…
DucatiKiller
- 32,976
- 22
- 150
- 267
7
votes
1 answer
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 overall length (22mm), which were measured with a…
Nick
- 1,945
- 4
- 20
- 30
6
votes
1 answer
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?
Jonathan Musso
- 4,740
- 11
- 30
- 52
4
votes
1 answer
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 should the rotor thickness measurement be the exact…
Hᴇʀʙɪᴇ
- 3,737
- 8
- 36
- 67
3
votes
1 answer
is it OK to use multiple blades of a feeler gauge to measure a larger gap
This feels like a bit of a silly question because I don't see any reason why it won't work fine - but I wanted to get some experienced/pro feedback. I need to measure a gap of .035 inches, my feeler gauge ranges up to .025 . My plan is to measure…
Cameron Roberts
- 783
- 7
- 18
2
votes
1 answer
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 plastigage.
Mobius
- 1,318
- 9
- 13
2
votes
1 answer
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-it-for-two-years oil. That's essentially my…
andrewb
- 1,056
- 6
- 14
- 22
2
votes
1 answer
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 about 180psi per cylinder can I convert that to an…
Robert S. Barnes
- 15,780
- 72
- 157
- 249
1
vote
0 answers
Oil Pressure: Bad Indication?
1997 Jeep Wrangler, 4.0L I6. Cam-driven mechanical oil pump. New engine in January 2018. 5-speed manual.
I've had the oil pressure gauge (top-right) drop to zero and the alarm go off, far too often for my comfort. Most of the time, it comes…
AaronD
- 622
- 1
- 5
- 13
1
vote
0 answers
how to Tee in a fuel pressure gauge to line on 2009 toyota corolla
Does anyone have experience teeing a fuel pressure gauge into the fuel line of a 2009 toyota corolla (specifically 1.8L) ? The 2010 model is virtually identical.
The service manual says to connect it to the fuel main tube. It also lists a tee…
kinidkinid
- 23
- 3
1
vote
0 answers
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
After turning the AC on the high-side pressure…
Zaid
- 39,276
- 50
- 151
- 294
1
vote
0 answers
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 normal conditions is OK but it's not so on bumps.I…
user402705
- 11
- 1
1
vote
0 answers
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 only aligned the vehicle and gave me the below…
Admia
- 123
- 1
- 4
0
votes
0 answers
Sizing a crush washer
This is a general question. Repair manuals often don't state the dimensions or materials of crush washers. If you Google it, crush washer dimensions are only reported in terms of the OD (outer diameter) rather than the (ID) inner diameter and they…
AdamO
- 360
- 1
- 3
- 15