Motor Vehicle Maintenance & Repair Stack Exchange
Motor Vehicle Maintenance & Repair Stack Exchange

Questions tagged [piston]

63 questions
14
votes
4 answers

Do pistons keep moving when the car stops?

When you are driving and stop at a light, do the pistons still move up and down due to combustion? If not how will the engine know when to combust the fuel to keep it moving?
LostPecti
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11
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1 answer

Interference vs non-interference engines

What do people mean when they say that an engine has an interference design? How does it differ from a non-interference engine?
Zaid
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10
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2 answers

What's gonna happen if I disconnect 'single piston'

I saw similar topics but that did not explain my things... As we can see 4 stroke engine with 4 pistons Is there any chance (only for test) to 'switch-off' two pistons? For this example I'm talking about spark plug/EFI disconnect of two pistons. Is…
dexzuo
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1 answer

What exactly is a "knurled piston"?

Recently I came across the term "knurled piston" and I don't know what it means. What is a knurled piston? What is the difference between that and a normal piston? Why should you use a knurled piston rather than a regular piston (or not, as the…
Max Goodridge
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9
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3 answers

3 rings vs 4 rings pistons: which design is better?

The engine I'm rebuilding (Skoda Estelle/120, 70's, RWD, rear mounted engine) was manufactured with two different pistons, depending the fabrication years: one piston kind has 4 rings and a cut from the oil ring to the bottom, at one side, and has a…
Aram Alvarez
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7
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2 answers

Where does the piston stop after the ignition is turned off?

Compression stroke at TDC or Exhaust at TDC or somewhere else? Is this position fixed or does it depend on other conditions?
Sameer Deshmukh
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2 answers

Safe to buy new piston for your two wheeler engine

I own a Honda Stunner 125 CC motorcycle. I bought it in 2009. Since last year I have observed that it is emitting white smoke. Mechanic recommends that I purchase new pistons or after some time engine would seize and then I would be paying for…
paul
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7
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3 answers

What is an inverted triangle piston skirt?

The recently launched Suzuki GSXR150 boasts an inverted triangle piston skirt. From what I have been told, it seems to be MotoGP technology which has been stripped down to suit a 150cc bike. Kindly explain.
You_Shall_Not_Pass
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6
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Do my new oil rings have an excessive gap?

Today I measured the new piston rings I will use while rebuilding my old Skoda Estelle engine. Skoda Set They are new from the Skoda factory (or that's what the box says), but they were manufactured in the late '80s! :) They are in pristine…
Aram Alvarez
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5
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2 answers

Rebuilding an engine: pistons installed, crank rotation "very" stiff

As I'm assembling my engine back (Skoda Estelle 120, 70s, RWD, rear mounted engine) I have the following issue: installed crankshaft, camshaft and distribution chain, torqued as manual recommends, it turns freely by hand (a little bit stiff). Then…
Aram Alvarez
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5
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3 answers

Extracting piston rod's "wire" C clips

So now that I'm getting ready (soon :) ) to fit new pistons in my old Skoda Estelle engine, I found that the piston rods have "wire" C clips. I mean, they look like a piece of wire, no "eyes" or tabs with holes in which we normally put the pliers to…
Aram Alvarez
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5
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2 answers

Cleaning pistons and cylinders with oven cleaner

Can I use oven cleaner (composition: 5-15% aliphatic compounds, 2-aminoethanol, butane and propane...) to clean the carbon off the cylinders and pistons of my BMW R80GS 1991 Motorbike (without damaging it)? I believe they are Nikasil coated, the…
Max
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5
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2 answers

Pivoted curved-path piston engine

Years ago, I saw a documentary about engine efficiency where people were testing a pivoted, curved-path piston engine. The claim is that the standard piston engine, with straight up-and-down path, causes lots of friction with the walls while the…
fernacolo
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4
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2 answers

Motorcycle 125cc question about PISTON condition and battery

Last year I bought a 125cc bike, Modenas brand, most likely unknown to you. It is a moped. http://www.modenas.com.my/v2motorcycle.asp?id=70 It can go as fast as 110 km/h enough for the city, However, I gave it to a family person for a while and…
GorillaApe
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4
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1 answer

Pistons ordeal: more pistons problems; two issues in one question

So, still having problems rebuilding this old engine (Skoda Estelle 120, 70's, RWD, rear mounted engine). First of all: getting new parts is out of the question since I have no access to those. So I need to get this done with whatever (s)crap I have…
Aram Alvarez
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