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

learn more… | top users | synonyms

7
votes
5answers
268 views

Fuel consumption at same speed of different engine

I am wondering why two car running at 100 km/h for example with a 100 hp consume less fuel that an engine of 300hp. Even if I take a supercar lighter and more aerodynamics it will consume more. But ...
7
votes
5answers
67k views

Cold start squeaking noise in engine

I just purchased a used 2010 Corolla 3 days ago. I've only now noticed that when I start the car, there is a squeaking sound coming from the engine. It lasts no more than a second. Sounds like it ...
7
votes
3answers
80k views

Car temperature displaying below Cold or just above Cold always?

I've noticed on my 94 Integra (bought used about 2 weeks ago) that the thermostat is often below cold, sometimes above cold but never up to the center mark. Today I was boiling inside my car as it ...
7
votes
3answers
32k views

Oil in coolant - how much trouble am I in?

I have oil in my coolant reservoir. Could it just be the head gasket or is it almost certainly the entire engine or might it be something else entirely? Thanks in advance...
7
votes
3answers
2k views

Car won't start, possibly due to ants in batteries

Yesterday there were a ton of ants crawling out of some hole in my backseat. I sprayed the shit out of them. This morning, when I try to start the ignition, my engine clicks a lot but won't turn ...
7
votes
3answers
85 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?
7
votes
1answer
176 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 ...
7
votes
3answers
170 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 ...
7
votes
2answers
2k views

2004 Ford Focus engine cover would not budge after all screws are removed

I have a 2004 Ford Focus SE 2.0L. There’s some oil leak on the engine. A mechanic told me it could be the engine valve gasket being cracked (the car is pretty old and never had a valve gasket change). ...
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 ...
7
votes
1answer
206 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
3answers
17k views

2009 Toyota Camry 2AZFE idle vibration remains after new motor mounts

My wife's Camry went in to the shop 2 months ago for a rough idle. We bought the car used in February with 72K miles. We've put on 10K and decided to have a mechanic look it over and tell us what it ...
7
votes
3answers
5k views

Motorcycle popping on acceleration

I have a 1975 Honda XL250 that I bought earlier this summer. Up until recently its been running great. It was leaking a little gas, but nothing too serious. When it started to get worse, I opened up ...
7
votes
3answers
2k views

Effects of leaky exhaust valves

While rebuilding my valves, I noticed that 4 out of 6 exhaust valves on one side of the V6 engine were leaking after lapping and I had to relap them. I determined that by doing a water test. I am ...
7
votes
6answers
82k views

Car shakes when in gear at red light

I bought a '96 Toyota Camry about a month ago. When I first turn the car on and the engine is cold, I can have the car stopped (in gear) and it will not shake. The idle RPMs will be at 1000. After ...
7
votes
2answers
1k views

What is the likelihood that my crankshaft is warped?

This may be an involved question so bear with me. :) I have a 1998 Honda Accord EX (4cyl) with 281xxx KM, and last week I was told by my mechanic that the harmonic balancer is warped. And in fact, ...
7
votes
1answer
64 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?
7
votes
1answer
74 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 ...
7
votes
1answer
47 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 ...
7
votes
4answers
102 views

2002 Ford F350 Superduty 7.3L Turbo diesel using a quart of oil every 43 miles

This Diesel engine has been rebuilt and it didn't use any oil till the HPOP went out. I replaced the oil pump and then I noticed my turbo when going up a hill and the Turbo would sound like a sneeze ...
7
votes
1answer
716 views

Why does an engine's idle RPMs take time to settle from a cold start?

I've noticed my car's (healthy) engine will idle at a slightly higher RPM for a few moments after it's been started from cold/not run for a day. I also noticed that my (somewhat less healthy) other ...
7
votes
2answers
10k views

Why would my engine temperature raise from normal to high and drop back down again?

I have a Nissan Micra (UK, 51-plate, 2001 model) that I have been using to drive to work on a daily basis - 10 miles each way a day on a variety of roads - streets, main roads, main roads in traffic, ...
7
votes
1answer
392 views

Ants in my lawn mower engine

Related questions: Are small engines on topic? (meta) Reviving a vehicle that has been idle for a long time. With the arrival of Spring, I went to dust off my riding lawn mower. It had been sitting ...
7
votes
1answer
37 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
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; ...
7
votes
3answers
9k views

What happens when you run out of fuel?

My question is specific to diesel or gasoline (petrol) engines. Many people told me that it is very bad to run out of diesel since it can damage the engine and it's difficult to re-engage it ...
7
votes
2answers
8k views

OHV vs. OHC: which is faster in speed, horse power?

What are the main differences in OHC and OHV engine designs, and which is faster or more powerful? Also, which is more reliable?
7
votes
3answers
298 views

Will I be okay running thinner oil with a minor oil leak on an older car?

Recently when I had some work done I was shown a minor leak, I believe he told me it was the oil pan. It doesn't drip out onto the ground, but if you look closely you can see condensed oil drops on ...
7
votes
2answers
45 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?
7
votes
0answers
71 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. ...
6
votes
8answers
10k views

What would cause motor mounts to go out on a factory engine?

I got my factory motor mounts replaced on my 2000 eclipse at 175k miles. I am now at 189k and the mounts blew again. I can hear the same rattling and squeaking. I had the spark plugs and valve cover ...
6
votes
2answers
785 views

Why would I paint my car engine?

I've been watching Pete's Garage on YouTube and the guy is absolutely amazing and very enlightening on the subject. He has at least one video on engine painting but he mentions it in a number of ...
6
votes
4answers
647 views

2015 Honda Fit iVTEC - Shifted into 2nd Gear at Highway Speeds

I was just driving on the highway and went to pass someone uphill, so I went to put it into 4th gear (from 5th or 6th). I somehow made the mistake of putting it into 2nd and the engine screamed and ...
6
votes
3answers
499 views

Trying to figure out the name of this car part!

I got new tires today and saw that the part that's circled is broken on my car. It looks like it just snapped at the top because part of the bolt appears to still be in whatever the tube is. Anyone ...
6
votes
2answers
872 views

Do valves rotate over time?

As I was doing my valve servicing, one question came to mind: As valves undergo millions of cycles of reciprocating motion, do they actually rotate or is their position relative to the seal fixed? Or ...
6
votes
2answers
18k views

Engine Size and Fuel Consumption

I have this weird misconception that the engine size is related to the amount of fuel being burned in one cycle(4-stroke engine). I know this is stupid but how does engine size relate to the amount of ...
6
votes
3answers
2k views

What kind of engine oil should one use in a diesel?

I got an 1987 Toyota Land Cruiser with a 2H diesel engine. I never changed oil on a diesel engine prior to this truck, so I'm a little confused. Toyota Factory Shop Manual recommend API CC oil type, ...
6
votes
3answers
3k views

Is it bad to drive slow at low rpms in 4th or 5th gear? Do you get better gas mileage?

Obviously running your engine at too high an RPM for too long isn't good. But what about running it too low? not so low that it stalls or lugs, but within around 1,000 RPM? Would you get better ...
6
votes
4answers
3k views

Why does my car scream on cold start?

My 1988 Subaru XT6 2.7L engine screams at me on a cold start then it will stop and then do it again when I take it out of park, but then it stops. Also, my car is losing antifreeze. Any ideas why?
6
votes
4answers
191 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 ...
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 ...
6
votes
1answer
328 views

Why are V engines less smooth?

I'm learning how to ride a motorcycle on a Suzuki Gladius SFV650, with a V-twin engine. But I also had the chance to ride a Kawasaki ER-5, which has a parallel twin engine (550cc). I've noticed that ...
6
votes
3answers
12k views

How do I find a vacuum leak? I'd highly prefer not to use a carb cleaner spray

The car is a 1998 Oldsmobile Intrigue with 3.8L V6 engine (3800 Series). I've been doing my research and due diligence, but please understand I'm very inexperienced with automobiles. I went to ...
6
votes
2answers
126 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" ...
6
votes
3answers
162 views

Can a valve suddenly break in half? Versys 650 destroyed engine

this week-end, I had to disassemble an engine from a kawasaki versys 650 (early). The bike lost power while making ugly metal sounds. It never started again. RIP. context: 108.000km, mostly higway ...
6
votes
2answers
695 views

Do you need charged battery for car to Idle

I am planning to acquire a 2001 Mitsubishi lancer 1.5 the car runs perfect but the it has an almost flat battery, even the horn doesn't work unless driven around.(No starting Problem though weirdly) ...
6
votes
3answers
63 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
33 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?
6
votes
1answer
419 views

Two-stroke dirt bike piston running into spark plug

Recently, I submitted a post on here regarding a broken ground electrode on the spark plug of my 2005 Suzuki RM125: Bottom piece of spark plug broke off in motorcycle engine Well, I found out what ...
6
votes
4answers
76k views

Slow Accleration And Moving RPMs

UPDATE: I bought a scan tool and downloaded the torque app. I don't get any error codes. I decided to drive it again today. I drove about a quarter mile and barely got to 20MPH. I turned around and ...