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

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Valve Guide Replacement - 1988 Jeep Wrangler

I've done some valve guide replacements on motorcycles. In the process I've typically done I heat the head up in an oven to about 300 F and shoot nitrogen into the guide which shrinks it and it ...
8
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1answer
59 views

Would bored out 307 need new heads

I have a Chevy 307 with casting number 3970020 and everything I've read says this particular block can be bored out to 4" effectively making it a 327. I plan to have my machine shop test it and make ...
7
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2answers
85 views

How can head port volume affect the power curve of an engine?

Recently I learned that even more things other than the ones already mentioned here can effect the power curve that is produced by the engine. Here is an example of one. I understand that there are ...
8
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3answers
102 views

What are common cold weather starting issues with cars?

Based upon the current weather in parts of the Northern Hemisphere, I would imagine there are some people suffering from all manner of cold related vehicle issues. What are some of the leading issues ...
9
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1answer
193 views

How does intake manifold runner length effect the power curve of a car?

Recently I learned that a number of things such as the cam profile, compression ratio and the intake manifold runner length and volume can all effect the power curve of the engine. Here is an ...
7
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1answer
404 views

What is a head?

Due to this question I now have a fairly well-rounded understanding of what a head gasket is. I assumed that sometimes, when people would talk about "heads" that this was just an abbreviation of ...
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0answers
21 views

What actually is brake horsepower (BHP)? [duplicate]

I know that BHP is the measure of power of an engine. I realised that I have no idea how the number (for example 540 BHP) relates to the engine itself. Does 1 HP mean one rotation of the crankshaft ...
8
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2answers
142 views

Natural Gas Engines - What are these things?

Someone I knew when I was younger converted a car to run on compressed natural gas (CNG) because CNG was extremely cheap in comparison to petrol or diesel. How can cars be converted to run on CNG and ...
6
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3answers
102 views

Steam Engines - What are these things?

I know that steam engines are considered to be old fashioned, impractical and rarely used. Why are they considered impractical therefore rarely used? How exactly might a steam engine work to power a ...
6
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1answer
73 views

External Combustion Engines - What are these things?

What are external combustion engines? How do they work? What types of external combustion engines are there? What are all the common advantages and disadvantages of external combustion engines in ...
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1answer
25 views

What “type” of engine does a Ford Fiesta, 2008, style climate D, 1.4 TDCi have? [duplicate]

a mechanic asked me this and I didn't know the answer.
9
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3answers
280 views

Location of exhaust manifold

In four cylinder engines, why are some cars designed with the exhaust manifold towards the front of the car while other cars have it towards the back? Is there any advantage in one design over the ...
8
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1answer
48 views

Roller rockers to a stock valve train

78 Nova but the engine is from a different car; casting # V0707CMH. I have a 350 with 305 heads. Stock valves, pushrods, cam, and lifters. The nuts on my stock rocker arms are in need of replacement; ...
9
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3answers
363 views

Why does my RPM drop when sitting idle at traffic lights?

While I'm sitting idle at traffic lights I put the car into neutral. The engine stays idling at about 1000 RPM. However every now and then it drops down to about 500 RPM and then quickly back up to ...
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4answers
2k views

How do you un-seize an engine?

I have an older engine that is seized. It is a 1953 Desoto Hemi. How can I un-seize it? I have sprayed Sea Foam Deep Creep down the plugs and let sit for weeks. As well as transmission fluid. To no ...
10
votes
4answers
380 views

Can you run an engine without a radiator?

I've heard of people starting engines in a build without a Radiator hooked up, to see if it fires. If you have an old engine and want to see if it will run: Can it be started without a radiator? ...
8
votes
2answers
506 views

Why is the effect of a bad fuel pump more noticable at higher speeds?

I get that the main effect of a bad fuel pump is that the engine will cut out at higher speeds, and that this is often not easily noticeable until that happens because there are little or no prior ...
4
votes
2answers
55 views

Why does my car die completely (after a battery recharge)?

Recently, the keys in my car were left in the ignition in the 'on' position and my battery was drained. I posted a question about replacing v. recharging (24930). I removed the battery from the car ...
14
votes
2answers
885 views

Why is a W-16 called, well, W?

The term "W-16" seems to imply some sort of configuration that resembles the letter W, which implies three banks of cylinders with one sharing a common cylinder head. In fact, the Bugatti W-16 in the ...
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2answers
55 views

Proper glow plug operation

Are glow plugs supposed to stay on after the engine has started to help with the firing of the first few revolutions?
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73 views

My mechanic forgot to put Coolant and now my car is not work! what can i do? or who should i blame [closed]

I had a small accident and I hit the whole front of my car and the radiator was damage. I took it to my friends mechanic (which i though i could trust) and asked for an estimate. He owes a Bodyshop ...
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0answers
36 views

The critical components that define an Adv tourer from other motorcycles [closed]

Mainly want to understand the running of an adv tourer. 1) what is the basic difference between the showa suspensions,WP suspensions and an upside down fork? Advantages & disadvantages of the ...
5
votes
1answer
33 views

Toyota corolla verso 1.794 petrol vvt-1-t2 [closed]

Recently Purchased Vehicle @milage 81.075 in the past vehicle has consumed 5.25 Litres of oil a full oil composition test was carried by my Garage. They also advise it is an uneconomical repair it has ...
4
votes
2answers
79 views

What is meant by bore and stroke?

All engine specifications reflect a bore and stroke number. Example Aprilia Tuono V4 R 2012 Four stroke, longitudinal 65° V four , DOHC, 4 valves per cylinder 998.9 cc / 60.96 cu in Bore x ...
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4answers
1k views

What are the benefits of a dry sump?

I've heard references to dry sumps, usually in reference to racing engines. But more recently I came across an article about a 'supercar' which stated that it had a dry sump. What are the benefits of ...
7
votes
1answer
187 views

How do old cars actually lose horsepower?

I have heard that when a car gets old it slowly but surely loses its horsepower to some degree. For example, I used to drive a 1997 Ford Fiesta with a 1.25L 1242cc engine that supposedly produces a ...
9
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2answers
59 views

How do I go about replacing the head gaskets in my Dodge truck?

It's a 1999 Dodge Ram 1500 4x4, Laramie SLT, automatic transmission, 5.9l magnum engine, and crew cab (222k mi). It seems to have some head gasket leaks, as there is some coolant burning. I have only ...
5
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1answer
59 views

Are there any vehicle engines that don't have a mechanical oil pump?

I my answer to How to move car a small distance without tow dolly I suggested putting a manual transmission vehicle in 3rd gear while towing with a rope or strap to apply back pressure and help keep ...
10
votes
1answer
77 views

What is the efficiency delta between rotary and modern four-stroke engines

Background There is a lot of opinion out there regarding the efficiency delta between wankel rotary engines and four stroke engines of various configurations (forced induction, etc). This delta, ...
6
votes
1answer
67 views

What are the basics of the combustion cycle in wankel (rotary) engines?

I'd like to understand more intimately the basics of the wankel engine combustion cycle. What I find interesting is: Simplicity of design Use of ports for intake and exhaust Conversion of energy to ...
9
votes
1answer
78 views

Ford Tractor 5600

This is a older tractor. My question relates to the fuel system. The older fuel injectors don't have any external seals? All of them seat and 3 don't leak but one does. I was looking for a seal but ...
4
votes
1answer
24 views

2003 Chevy Malibu Deluxe. Engine counter balancer timing

I replaced my timing belt. Now the engine vibrates horribly. I believe the cam timing is 100% but I believe I didn't time my counter balancer correctly. The Haynes manual photos and description ...
18
votes
3answers
882 views

What does under-square and over-square mean?

When building an engine, the terms over-square and under-square come up. What do these terms mean? How do they apply to engine building? Which is better for what purpose? Can you give examples ...
6
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1answer
111 views

What exactly is an “idle jet”?

I think this thing has something to do with injecting fluids in to the engine. What exactly is an "idle" or "pilot jet"? Does every car have one? What is their functional purpose (i.e. what do they ...
7
votes
1answer
121 views

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 ...
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1answer
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2010 Hyundai Accent starts but won't stay running

Car would stop running while driving it and wouldn't start after that; changed the alternator and now it will start but it doesn't stay running. It stalls every time I try to put it in gear to drive ...
10
votes
1answer
197 views

How do I get more power out of a rotary engine?

Background I'm looking at a few cars for a track day car that I can abuse. One of the vehicles I'm considering is an older Mazda RX7. The primary reasons being that it has a rotary engine as well ...
5
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1answer
95 views

Why do casting numbers on engine blocks matter?

In this question the OP references the block casting number his 454 GM motor. Why is the block casting number relevant information when talking about an upgrade to an American V-8 engine? Is this ...
7
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3answers
409 views

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

I know that a lack of engine oil can destroy an engine, so I was curious as to whether it is just as bad to drive a car with a very low engine coolant. What is engine coolant? What exactly are all ...
7
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2answers
307 views

What are all the different types of fluid in a car and a short summary of their use?

A fluid is defined as anything that flows, hence for our purposes a gas or a liquid. I know that there is fuel, engine oil, engine coolant and brake fluid. Also air is normally taken in through a ...
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0answers
58 views

What will upgrading the Camshaft do to my BBC 454?

I have been told that upgrading the Camshaft in my GM 454 will increase performance. What will this do exactly and what will the engine actually gain? 10069286 block casting 454cu '90-'91 MY, Mark ...
22
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2answers
2k views

Why do two-stroke engine exhaust pipes look so strange?

Two stroke gasoline engine exhaust pipes are shaped strange. They expand into a wide diameter and then shrink down to a very small diameter where the exhaust gasses emerge into the environment. Why ...
4
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0answers
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Vauxhall Vectra engine (1.6 petrol) cuts out

My beloved Vectra C (2006) a previous story here developed a new "symptom": engine cuts out while driving. Since there are other (possibly connected) symptoms I am going to list them one-by-one: ...
13
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2answers
383 views

Why do Harley Davidson engines suffer from such poor performance?

The modern Harley Davidson engine has very poor power output. Even when highly modified a 130HP engine can cost tens of thousands of US Dollars. Here are specs on one of the modern engines. ...
8
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3answers
200 views

What do the terms “combined port” & “direct injection” mean?

I heard these terms recently as part of the description of a new car. I know that there are intake and exhaust valves in the engine that are controlled by cams on the camshaft (if that helps you ...
5
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2answers
57 views

What exactly is an intake manifold?

This is one of those phrases I have heard a lot but never bothered to ask what it meant. Until now. What exactly is an intake manifold?
7
votes
1answer
69 views

What exactly is a head gasket?

From what I have gathered, a "head gasket" is an important part of the engine on most cars, but that is about it. What is a head gasket? Where is a head gasket? Why is it necessary?
8
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3answers
893 views

What actually happens when there is way too much oil in a car engine?

I saw the answers to a question I posted recently highlighting the disadvantages of having too little oil in an engine, but that got me wondering what if the complete opposite were to occur! I know ...
7
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1answer
117 views

What exactly is meant by “engine coolant”?

I know that engine coolant is a fluid in the engine used to dissipate heat spots and keep the engine cool in general as the moving parts generate heat. In this context, I would call the oil an "engine ...
10
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1answer
78 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? ...