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

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6
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1answer
165 views

What is the effect of the throttle body on the power curve produced by the engine?

I heard from another member of this community that the throttle body, among other things, has the ability to change the power curve of the engine. What exactly is a throttle body? How might the ...
3
votes
2answers
85 views

Why might you choose to change to using an aftermarket throttle body?

I have heard that some people might want to buy an aftermarket throttle body. Is the reason for this simply to replace a broken one or are there also other specific advantages (and disadvantages) to ...
10
votes
1answer
148 views

Coolant Reservoir

Two questions, One, is there any reason why some coolant bottles are shaped in this way? Two, if this coolant bottle was placed on its side such as in the image below for example would coolant ...
7
votes
1answer
111 views

What is a Blower?

I've heard of this component being used on Hot Rods. What is a blower? What does it do? Are there specific requirements for utilizing one? Are there any disadvantages of using a blower?
6
votes
1answer
82 views

What is the problem if my car's engine stops running in the middle of a ride?

My car's engine frequently stops in the middle of a ride. Its an old model of Hyundai Sonata 2004. This happens especially in high gears(3,4) and faster speeds (like 60-70 mph). It has also happened ...
4
votes
2answers
111 views

What is wrong with my car?

My car had a broken piston, and broke down completely. I bought a new engine, and had it installed. everything seemed to be working aside from a low clicking sound when driving coming from the engine. ...
1
vote
0answers
21 views

1999 Ford F250 xlt super duty

My truck has the 6.8l V10 Triton engine in it when I got it there was a lot of oil in the cooling system but no water in the oil it ran hot once but didn't do it again would it be the head gasket and ...
12
votes
2answers
102 views

How to Remove Core Plugs? (aka Freeze Plugs)

I have been removing core plugs from an engine I'm rebuilding with varying levels of violence. The engine block is aluminium and I'd like to reduce the chance of of me damaging it. How do I remove ...
5
votes
1answer
103 views

Brake Mean Effective Pressure, how is this an effective measurement tool for engines?

Many engine designers measure success with Brake Mean Effective Pressure What are the equations used to calculate Brake Mean Effective Pressure? Why is this a more or less effective measurement ...
8
votes
1answer
90 views

Pneumatic Valve Spring Operation in Formula 1

In the 2006 Formula 1 World Championship the rules allowed for pneumatic valvesprings. These engines were required to have a 90° V8 engine with 2.4 liters of displacement, 4-valve-per cylinder layout ...
7
votes
0answers
57 views

My engine stalled and wont restart - after downshifting - Automatic Trans [closed]

My engine stalled and wont restart - All I did was downshift... 2005 Chrysler Town & Country Limited. V6 - 3.8 Liter EFI. For some history, a couple days ago I noticed a clicking sound - it ...
3
votes
1answer
68 views

1995 Mercury Grand Marquis, loud whine corresponding to engine revving

My '95 Grand Marquis (or as I like to call it, a Grandma Rquis) is suddenly very loud. There doesn't seem to be any issue with the performance, and when it's idling, it's as quiet as can be. I'm ...
15
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6answers
2k views

Why or why not increase engine efficiency by running the car “fuel-lean” (using a turbo or supercharger)?

Everyone wants their cars to use less fuel, right? I read the following passage about running the car fuel lean from this website: Run the engine fuel-lean, that is, use excess air. It is well ...
4
votes
1answer
26 views

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
votes
1answer
64 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
votes
2answers
124 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
votes
3answers
113 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
votes
1answer
356 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
votes
1answer
628 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 ...
2
votes
0answers
29 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
votes
2answers
145 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
votes
3answers
110 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
votes
1answer
86 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 ...
1
vote
1answer
28 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
votes
3answers
386 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
votes
1answer
55 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
votes
3answers
3k 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 ...
21
votes
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
1k 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
574 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
68 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
909 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 ...
8
votes
2answers
62 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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vote
0answers
102 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 ...
1
vote
0answers
37 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
38 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
109 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 ...
20
votes
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
211 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
votes
2answers
78 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
votes
1answer
91 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
95 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
107 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 ...
4
votes
1answer
25 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 ...
19
votes
3answers
1k 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
votes
1answer
140 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 ...
9
votes
1answer
174 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 ...
-1
votes
1answer
107 views

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
290 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
votes
1answer
129 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 ...