Internal Combustion Engine. Most engines in road going vehicles are 4-cycle internal combustion gasoline engines.

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7
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1answer
59 views

Dirty air filter seal

Whenever I have had work done in the past that I can't perform myself, timing belt etc every garage I have been too has made a real mess with my air filter. When I check the filter there is always ...
4
votes
1answer
57 views

Poor battery condition, replacement required! Or is it?

I drive a 2004 VW Passat B5. Recently, my insurance company came round to fit a black box to my car as part of the terms and conditions of my car insurance policy. Whilst they were doing this they had ...
8
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3answers
128 views

What prevents engine oil from mixing with petrol in motor bikes?

Engine oil is used in the lubrication process, at the same place petrol is also there. What prevents engine oil mixing with petrol in motor bikes?
5
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3answers
1k views

What exactly is a clutch?

I found out recently that the flywheel, driven by the crankshaft, is connected to (or part of) the clutch. I have a basic understanding of what a clutch does due to the fact that I know how to drive a ...
17
votes
2answers
685 views

What does a flywheel do and what is it connected to?

I understand roughly how an engine works and that there is a crankshaft which is able to turn the flywheel using internal combustion. I have just realised that I have got absolutely no idea how the ...
6
votes
2answers
276 views

How exactly does an increase in engine temperature cause a car to breakdown?

I have an engine temperature gauge on the dashboard of my car (as most people do), but if for some reason the engine temperature is caused to increase (due to a lack of cooling or what have you), the ...
32
votes
9answers
25k views

What actually happens when there is not enough oil in a car engine?

When a car is topped up with oil, it clear to most people that you are supposed to fill it to the recommended amount as specified by the manufacturer (normally on a dip stick). What exactly are all ...
9
votes
1answer
74 views

What exactly is a piston?

Here is a diagram of a disk brake. Notice that there is a piston (in red): This is a piston, most commonly used inside the internal combustion engine: Image 1 Source: ...
17
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4answers
846 views

What is regenerative braking and why don't we use it?

I know that many electric cars use regenerative braking to enable the car to become more efficient by converting what would otherwise be lost heat energy in to a more useful, reusable form of energy. ...
10
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2answers
109 views

1982 Yamaha Virago - Several things are wrong and i'd like to repair myself

Several things have happened in the past couple days and I would like to know what could possibly be wrong before I take it all apart. Engine dies after letting off the throttle while on the road. ...
7
votes
1answer
142 views

What are crankshaft bearings and how are they different from camshaft end bearings?

I hope the answer is not too similar to this question. I have a basic understanding of the role a crankshaft plays in the internal combustion engine, which leads me to ask: Crankshaft Bearings ...
4
votes
1answer
64 views

What are cam shaft end bearings?

I now have a basic understanding of the role a cam shaft plays in the internal combustion engine, but what is a bearing? Or more specifically, what exactly is a "cam shaft end bearing"? Also, where ...
22
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1answer
440 views

5-Stroke Engines - What are these things?

What is a 5 stroke engine? Why aren't they using them in vehicles right now? Is this a new thing or has it been around for a while?
4
votes
1answer
43 views

1997 Ford Fiesta Strange Ticking Noise

The 1997 Ford Fiesta I sometimes drive has started to make a strange sound. It has started to make a ticking sound after I was pushing the tiny little 1.25L engine very hard on the way up North with ...
9
votes
2answers
193 views

What are Performance Camshafts?

I read the following question recently: What is it about performance cams that make engines produce more power when they are installed? I know there are a few components for cars that have "cam" ...
5
votes
1answer
87 views

How to increase horsepower? [closed]

How can you increase horsepower on an engine through general modifications without modifying the internals of the engine? Are there benefits or tradeoffs from doing so? What kind of things could I ...
10
votes
1answer
543 views

What is a 6 Pack and will it add performance to my engine?

What is a 6 pack in the hotrodding world? Does it improve performance of my engine?
5
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0answers
79 views

Can you identify this part?

I have just had the cam belt and water pump changed at my local VW dealership on my 2004 VW Passat B5 and on the technical report they were kind enough to point out everything else they wanted to ...
4
votes
1answer
111 views

Cam Belt vs Belt Drive vs Serpentine Belt vs Fan Belt vs V Belt vs Timing Belt

I have a 2004 VW Passat B5 and having started to learn a bit more about engine theory, I was wondering how many belts I have and what names each of the belts have. So, I have a two part question: ...
5
votes
0answers
33 views

Ford F-150 4x2 4.9l straight 6 misses after lots of work

Just seems like plug wire, plug, or something missing shakes whole truck. It's acting like it's starving for gas. New plugs, plug wires, MAF sensor, idle control sensor, cleaned and still can't figure ...
12
votes
4answers
317 views

2000 VW Polo struggles to/won't start when engine warm

My 2000 1.4 petrol polo struggles to start when warm and sometimes will not start, until the engine has cooled down a bit, when the engine is on the hot side of warm. Embarrassingly, I have lived ...
1
vote
0answers
43 views

hi I've just done engine overhaul car is not starting [closed]

Good day. I've just done an engine overhaul of a Fiat Palio 16. When I try to start it the is swing but not start.
5
votes
0answers
98 views

Remanufactured 5.3 engine not firing on one bank

2007 Chevy Avalanche 5.3 vin 3. Bought a remanufactured engine, after install truck runs only on bank 1 (1,3,5,7). Have power to coil packs on bank 2 (2,4,6,8) but no spark. Put in new cam sensor, ...
12
votes
2answers
105 views

What is meant by degreeing a cam?

In the hot rodding world, "degreeing the cam" is an often used term when installing an aftermarket camshaft. What does the term mean, what does it do for you, why should you do it, and what are the ...
24
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1answer
2k views

Why are the blades of old car radiator fans unevenly spaced?

Fans that look like this: Is it to somehow help the balance of the engine?
10
votes
1answer
96 views

Formula 1 valve trains

There was a statement in a post regarding Formula 1 valve trains being pneumatic or magnetic. Are there valve trains driven magnetically or pneumatically that are on the market? When did they start ...
8
votes
1answer
72 views

How does Valve Overlap affect emissions?

In this question, it is suggested that valve overlap can affect emissions. In what way can valve overlap affect emissions?
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2answers
398 views

Why do Formula 1 cars use engines with many volumetrically small cylinders?

What's the benefit to Formula 1 using engines like a 3.0L V8 or a 2.4L V8? I read this Reddit discussion on why it's not practical to put small many-cylindered engines into production cars. Cost ...
10
votes
1answer
59 views

What Can I Learn From Exhaust Manifold Temps?

I was wondering what I can learn from the temperatures on the individual exhaust pipes coming out of each cylinder. The question is general, and my specific example is on my 98 Mazda 626 GF 2L. Last ...
15
votes
1answer
115 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 ...
8
votes
1answer
445 views

How to use an engine stand

This is one thing which I have asked many times on a car forum and never received a satisfactory response for. I know that the engine block is somehow bolted onto an engine stand like the one ...
7
votes
2answers
495 views

Two-Stroke Diesel Engine - Do they use forced induction on them?

As I have indicated before, I'm very diesel ignorant. I just know the basics, very basics. In a two-stroke diesel engine using forced induction seems necessary but at the same time I see challenges. ...
6
votes
1answer
148 views

Two-Stroke vs. Four-Stroke Diesel Engines - What is most commonly used in heavy vehicles?

I am not well versed in diesel engines. To prove my point, I've learned in the last month that a two-stroke diesel engine actually exists. My Question. What kind of diesel engine (four-stroke or ...
9
votes
1answer
89 views

What is Lobe Separation Angle (LSA)?

What is Lobe Separation Angle (LSA) and how is it used in camshaft design? How is it measured? What difference does a long or short LSA make?
6
votes
4answers
207 views

Cheap vs Expensive Fuels [closed]

What is the difference between the cheapest fuels in a place like Tesco's and the 'high quality', highly priced competitors? Is there actually any noticeable difference in available power, engine ...
5
votes
2answers
71 views

2004 VW Passat B5 Peculiar Engine Noise

Recently I have noticed that whilst driving there is a very high pitched whining coming from the front of the car. On closer visual inspection with the engine running I opened the bonnet to try to ...
3
votes
0answers
40 views

Break-in engine [duplicate]

I am going to buy new car Mitsubishi Pajero Sport (Model: MBS MT 4x4). I've heard stories of people 'breaking in' engines for the first few hundred or couple thousand kilometers using methods such as: ...
8
votes
2answers
259 views

Fiat Punto Wont Start. Fuel Light & Three warning lights flashing

My Fiat Punto 1.2 Year 2000 MK2 (I believe) will not start. The engine turns over but the car won't start. The fuel light is flashing and petrol gauge says empty which isn't the case. There are three ...
16
votes
4answers
2k views

When does it make sense to replace a camshaft?

Preamble (Rant) I was reviewing this question in which the OP presents a repair quotation that includes replacing the "intake camshaft" to fix an engine that had overheated. To me this ...
3
votes
1answer
224 views

VW Passat B5 EPC Light on Dashboard

There is a yellow light on my dash that says 'EPC'. I have no idea what this could mean on my car as I haven't noticed any difference in the way it drives, nor are there any unusual sounds other than ...
7
votes
1answer
195 views

What should one do to reduce the HP lost at the wheels on an automatic transmission?

I have a 1990 Toyota Supra Turbo 4 speed auto. I've done some research about automatic transmissions and manual transmissions and what are the positives and negatives of each. (For example, MT is said ...
6
votes
2answers
124 views

RPMs jump to 2500 when clutch is disengaged or transmission put in neutral

Good morning all. I drive an 05 Chevy Cavalier, 2.2L, 5-spd manual trans. Lately I've been having issues which I am told is throttle related. As I'm driving for a little bit (time varies) I go to ...
4
votes
2answers
116 views

Engine idle surging on startup & sputters during acceleration

So I don't know anything about cars. But my truck has been having a few problems. It starts up fine and then the idle is really weird, the RPM's surge. The motor keeps bogging down and when you try to ...
5
votes
1answer
58 views

New fuel pump and spark plugs but gas pedal still not responding

I have a Ford Explorer 2007 and I'm experiencing the car cutting out on me. For example, when turning a corner with the engine revs low, the gas pedal wouldn't respond and then the car cut out. It ...
14
votes
3answers
487 views

What is valve float and how does it impact engines?

The Wikipedia entry is hard to grok: Valve float is an adverse condition which can occur at high engine speeds when the poppet valves in an internal combustion engine valvetrain do not properly ...
4
votes
1answer
80 views

Can snowblowers auger belt weaken or is this just wet snow

So I have an old Toro 824 used snowblower from the mid 90's. The last two times I used it we had wet snow. Snow kept getting clogged and I had to break it up with broom and then it would just clog ...
15
votes
2answers
558 views

Why did Ducati decide to use the desmodromic valve train rather than a more tradition valve train?

Ducati's use a unique method to open and close their valves. It's called the desmodromic valve train. The desmodromic valve system does not use springs to close the valve, it uses the cam and has a ...
7
votes
3answers
302 views

Why don't all diesel engines have throttle plates?

I learned recently that many older and some newer diesels don't have throttle plates to control airflow. I was also quite shocked to learn about a condition called diesel engine runaway. Apparently ...
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0answers
43 views

My 94 Toyota 4runner doesn't seem to gain speed even while I'm flooring the gas pedal…whats the issue and how can I fix it? [closed]

94 toy 4runner 6 cylinder. Just replaced sparkplug wires and distributor cap..
7
votes
1answer
138 views

Scatter Camshafts - What are they and why do I want one?

It seems in the world on mini's as in Mini Cooper, there is a camshaft called a scatter cam. It changes the timing for cylinders 2 and 3. I've heard of changing the timing to have 1 and 4 firing at ...