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

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53 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; ...
8
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1answer
158 views

newly rebuilt engine, long warm-up & severe shaking

I have a 2002 Toyota Celica GT with a newly rebuilt engine (ran out of oil and threw rods) but problems still persist. I was told by the mechanic to allow myself a 500 mile break in time of not ...
8
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1answer
157 views

R32 Skyline GT-R low power

EDIT: Added info from comments to bottom of question. My friend recently imported a right-hand drive 1990 Nissan Skyline GT-R (R32) with the RB26TT motor into the states. It's beautiful, and I'm ...
8
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0answers
135 views

Clunking sounds when decelerating or idle with clutch engaged

I have an issue with a 2010 Opel / Vauxhall Insignia 2.0 CDTI Sports Tourer (aka Buick Regal in the States if I'm not mistaken) and I'm having difficulties pinning it down. It's going to be a lengthy ...
8
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2answers
418 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 ...
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4answers
2k views

why do engines have so much unused horsepower?

I've looked at the power rating of an engine used in a Humvee (5500 lbs) and was surprised it's only ~190 horsepower, which is exceeded by many 4 door sedans. So an obvious question is why doesn't my ...
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3answers
1k 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 ...
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4answers
34k views

Is engine braking harmful? [duplicate]

Possible Duplicate: Does Downshifting (Engine Braking) Cause Extra Wear and Tear? My wife and I have a disagreement about a practice of mine--engine braking. When I'm driving her manual ...
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2answers
544 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. ...
7
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6answers
42k views

How to get a motor to Top Dead Center

I'm not sure how specific to my car this is or not, so I will include my car information just in case: It's a 1991 Honda CRX, base trim(the motor is the d15b2). On to the question: How do I go about ...
7
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4answers
727 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 ...
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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, ...
7
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2answers
493 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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3answers
16k views

What is a rod knock?

What is a rod knock? What causes a rod knock, how bad is a knocking rod, and how can I tell if a rod is knocking?
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2answers
331 views

How do modern engines differ than older ones

Modern engines produce more horsepower with more fuel economy but with the same procedure of burning the fuel air mixture and moving the piston, but the old ones and new ones are both four cylinders ...
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3answers
165 views

What are some typical maintenance things that every owner should do regularily?

Right now I just get a car wash every month, and my oil changed and whatever is included in that. Usually just a quick "inspection". Is there anything else I should be doing for my car? Or also, is ...
7
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2answers
21k 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 ...
7
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1answer
557 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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5answers
74k 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
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3answers
97k 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
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2answers
563 views

How can I be sure that a rod knock is actually a rod knocking?

I have a 2005 Ford Escape 2.3 L engine, there is a knocking type sound as soon as the engine is started and the speed of the "knocking" follows the RPM. How can I be sure that it is in fact a rod ...
7
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1answer
209 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 ...
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3answers
451 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
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1answer
163 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 ...
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2answers
317 views

Why do engines run badly below the normal idle speed?

When the engine speed in my petrol car drops below about 650-700 RPM - the normal idle speed - it starts to shake and judder. This could be because say, I didn't give enough gas when pulling away. ...
7
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1answer
452 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 ...
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2answers
350 views

Okay to add new oil to old?

Title pretty much explains, I change my oil every 4-6k miles depending on how generous I’m feeling, however will the oil dirty oil that’s already in the sump mix with the clean oil when topping up? ...
7
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1answer
203 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 ...
7
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3answers
272 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 ...
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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
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3answers
6k 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
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2answers
107 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 ...
7
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3answers
1k 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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3answers
5k 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
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1answer
128 views

Small crack/gap between cylinders on block

I was doing a head gasket replacement onnmy 86 Kawasaki ninja gpz1000 and I while cleaning the gunk off the top of the block I noticed a small gap/crack in between two cylinders (Pictures are linked ...
7
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2answers
48 views

How to flush engine coolant system after oil intrusion

My 02 Buick LeSabre has oil coming from the radiator into the coolant reservoir. Just recently I had a new motor put in to fix the issue. What would be the best/proper way to flush the radiator? It ...
7
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1answer
98 views

Does free revving a diesel engine to 4000 rpm (1.6 crdi- hyundai) cause any damage?

It's a Hyundai CRETA/ ix25 model... clocked 1800kms on the odometer, diesel spec engine 1.6 crdi unit, manual transmission! It has redline at about 4800rpm in the tachometer. When i took it for ...
7
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1answer
220 views

Why do electric motors produce peak torque instantly vs gasoline engines

On a separate forum someone had asked why do electric cars do not have a transmission. The simple answer was that electric cars produce peak torque at any RPM but the gasoline engine needs to rev ...
7
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1answer
214 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 ...
7
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1answer
580 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 ...
7
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1answer
37 views

2015 Honda Mobilio - Car shakes when started

I have a 2015 Honda Mobilio with a manual transmission. I have had this car for 6 months and have not experienced any problems until yesterday morning. When I start my car, the engine shakes badly. ...
7
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2answers
79 views

How do I remove oil sludge from an installed engine?

What's the preferred, non-chemical/non-additive method for removing oil sludge from an engine that's still installed in the vehicle? I'll have the head and oil pan removed. How do I clean out the ...
7
votes
1answer
104 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
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1answer
76 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?
7
votes
1answer
134 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 ...
7
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3answers
173 views

Will an old engine have worse fuel efficiency than a new engine?

I have a gasoline-engine car that is four and half years old and has been driven for 60 000 kilometers. I have noticed that the fuel efficiency is not what it was when the car was new. However, I ...
7
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2answers
2k 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
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1answer
68 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
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4answers
183 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
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1answer
158 views

Car can't start after rocker gasket change

I have a 2008 BMW 120d LCI with N47 engine. Recently was diagnosed with some oil leak on the rocker gasket near the injector area. Were advised to change the rocker gasket seals. So I did change the ...