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

learn more… | top users | synonyms

6
votes
1answer
35 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
1answer
185 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 ...
8
votes
3answers
1k views

Looking for suggestions about what to try and fix on my tecumseh snow blower engine that stalls after you stop putting load on it

I have a troy bilt snow blower with a tecumseh engine and it starts great and runs great. Most of the time, anyway. It will scoop up snow and throw it just fine, and then for no obvious reason it ...
6
votes
1answer
197 views

why is it not good to stall a cold engine

I've always known that you cannot stall (regular turn off by turning key (i'm not sure how that's called in english)) an engine if it is not yet reached it's work temperature. For example, if i go to ...
5
votes
3answers
108 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 ...
2
votes
0answers
20 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 ...
6
votes
1answer
71 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 ...
6
votes
1answer
45 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 ...
12
votes
4answers
6k views

Car crash: when does a car catch fire?

Which kind of crash does it need for a car to catch fire? I'm asking because I was discussing about an accident where a car crashed into a full-grown brown bear. Is it realistic under normal ...
9
votes
3answers
241 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 ...
5
votes
2answers
777 views

Cadillac CTS 2007 3.6 oil consumption

3 months ago I bought Cadillac CTS 2007 3.6 with 31k miles, next day I went to local garage and changed the oil, filters, etc. I have driven 7k miles since and when driving last week car started ...
1
vote
2answers
54 views

Does a 2010 volkswagen jetta 2.5 have a timming belt or timing chain or both

Does this 2.5 volkswagen jetta se 2010 have a timing chain or timing belt or both. And need to know how to time it
8
votes
3answers
117 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 ...
7
votes
1answer
36 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; ...
10
votes
2answers
2k views

How does ambient temperature affect engine efficiency and fuel consumption?

I remember from my physics class that the ideal-gas Carnot engine is more efficient if the temperature difference between the heat source and the thermostat ("heat recipient") is larger ...
12
votes
2answers
688 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 ...
11
votes
2answers
825 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 ...
7
votes
2answers
461 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 ...
9
votes
1answer
571 views

Brake Specific Fuel Consumption of 2-stroke vs 4-stroke

How much fuel do various types of engines burn per power output? I'm especially interested in naturally aspirated piston engines, and comparing two-stroke to four-stroke. The wikipedia article gives ...
1
vote
0answers
27 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
28 views

Toyota corolla verso 1.794 petrol vvt-1-t2 [on hold]

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 ...
29
votes
9answers
5k 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 ...
14
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 ...
1
vote
0answers
46 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 ...
4
votes
2answers
54 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 ...
5
votes
1answer
105 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 ...
8
votes
2answers
48 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 ...
8
votes
1answer
56 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? ...
6
votes
0answers
40 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 ...
5
votes
2answers
170 views

Reaching top speeds to maintain engine tuned

I live in Central America. Driving is different than in 'Western' countries. Roads are often in bad shape, and it is very common to encounter people / cows / carts / painfully slow cars on the ...
8
votes
5answers
8k views

Why does a diesel sound like that?

My car is in the shop for a repair, and they gave me a loaner. It's a Chevy Cruze Diesel. Sitting on the driveway, my wife said, "It sounds like a truck". It does. So what exactly it is about ...
19
votes
2answers
1k 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 ...
6
votes
3answers
237 views

What is the effect of adding more cylinders to an engine design?

I was trying to understand more about torque when I was comparing two engines, totally different engines. one engine ( Straigh 4 ) that produces 149 ft-lb at the maximum HP given (237HP@8300) the ...
3
votes
1answer
31 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 ...
6
votes
1answer
37 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 ...
10
votes
1answer
45 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, ...
5
votes
2answers
200 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 ...
3
votes
1answer
19 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 ...
3
votes
1answer
717 views

Does using the entire rev range of a car damage it?

On my standard 2000 1.2 Opel Agila, I often have to get to about 5000RPM to join a fast road on a steep (1 in 10) hill, as it is gutless on hills. I have to do this almost every day, and I have ...
5
votes
3answers
2k views

Does revving a car when cold make it warm up faster?

As winter comes along, I've always thought that revving the car would make it warm up faster, so the heating works better to clear the icy/steamed up windows. Does revving my car at idle to about ...
5
votes
1answer
37 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
32 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 ...
7
votes
3answers
297 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 ...
4
votes
3answers
17k views

Burning Smell and Faint White Smoke

I have a 1999 Audi A4. Recently there is a burning smell when driving that is noticeable when stopped after driving. At night I noticed a faint white smoke blowing out of the front in the headlights. ...
9
votes
1answer
135 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 ...
10
votes
2answers
107 views

Motorcycle Four Body Carburetor Synchronization Balancing

I would like to adjust four-body carbs by myself, in order to avoid spent money every time. What are the basic rules, tools and secrets of synchronizing multiple carburetor bodies?
5
votes
1answer
67 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 ...
4
votes
0answers
46 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 ...
3
votes
1answer
129 views

what engine oil does a 1992 subaru liberty auto stationwagon need? Answers in “W” units please

What engine oil does a 1992 Subaru Liberty auto station wagon need? Answers in "W" units please. I need to add oil and I cannot find a good reference as to what to use - the oil at the garages are ...