General internal combustion engine questions.

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7
votes
2answers
5k 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?
4
votes
2answers
142 views

How much fuel does it take to start an engine?

I appreciate this is a question that can't be answered in facts and figures, so I'm after a general idea. I drive a 1986 Supra, which has a modest 2.8-litre engine. I often shut the engine off while ...
2
votes
0answers
18 views

My BMW X5 won't stay running

Hello I have a 2003 BMW X5. I just got the engine replace a couple days ago. I went to pick it up but because the shop was done installing the motor but now I have to deal with the other problems I ...
2
votes
4answers
988 views

Problems in building higher displacement 2 stroke engines

I understand(from preliminary research) that when engine gets bigger(higher displacement) it is practically not possible to have a two stroke engine. What are the implications in building a higher cc ...
7
votes
3answers
1k 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 ...
2
votes
1answer
106 views

Ticking/clicking when accelerating 1997 Dodge Caravan

My caravan began ticking when accelerating yesterday. It ticks fairly loudly when accelerating and much softer and slower when idle, or slowing down. Ticks slow and steady when idle or in park. Does ...
2
votes
1answer
185 views

Engine, sudden reduced power with soft shaking

I have a 2007 Holden with a 2.0 Turbo engine. On one day I decided to go through a light that had just turned orange- so I pressed down, not completely as I new how much power I needed to go through ...
0
votes
0answers
9 views

changed my engine in my 2009 Volvo s40 lost power

I had an engine issue and end up changing my engine in my 2009 Volvo s40 The new engine does not have the same power that the other one had.. When acceleration in the highway It feels so slow until ...
2
votes
1answer
43 views

Engine Reving Up in Park and Neutral?

I have a 2001 Chevy Silverado 1500, it has about 118000 thousand miles on the engine, lately it is taching up to over 2000RPM only when i put it in park or neutral. Once i put it into drive or any ...
1
vote
2answers
34 views

Which Engine is more powerful?

Engine A Specifications: Displacement: 1198 CC Max Power (bhp @ rpm): 87 @ 6000 Max Torque (Nm @ rpm): 110 @ 4800 Engine B Specifications: Displacement: 1197 CC Max Power (bhp @ rpm): 82 @ 6000 ...
1
vote
2answers
1k views

Peugeot 206 engine occasionally cutting out when idle

Sorry if this is vague, I don't know very much, but I'll do my best. I want to have as much information possible before taking it to a garage to do anything. I have a 2003 Peugeot 206 1.1l which has ...
2
votes
2answers
100 views

Engine jerking and revving, multiple failed ignition coils

This problem started a month ago. My Aveo started revving and jerking when it was sitting at a light on my way home (2 blocks from my house) and the engine light came on. I drove it home. The next ...
1
vote
1answer
27 views

2006 Pontiac g6 rough idle and intermittent spongy brake and starting issue

I have a 2006 Pontiac G6 with 160k on the 3.5 motor. Around 155k the brake pedal went hard and spongy. Also, about 1 in every 40-50 times I start it cold, the starter will turn without a successful ...
6
votes
2answers
137 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 ...
2
votes
1answer
420 views

Does stalling damage my car?

I sometimes stall my car, as I have a new one and the biting point is so high. Anyway, someone told me stalling damages my car, but all it does is force the engine to a stop... Does constant ...
1
vote
2answers
58 views

2001 GMC Jimmy wont start?

Hi I have a 2001 GMC Jimmy it was running fine, then parked it. it starting acting funny, sometimes would take a couple times to start, so checked my oil dipstick, it read a little high and smelt ...
1
vote
1answer
62 views

Had major overheat issue but engine was rebuilt 3 months ago

I had my engine completely rebuilt three months ago (new gaskets, timing belt, water pump, etc.) and yesterday the engine completely overheated (temperature was at the mid-line, then 10 minutes later ...
3
votes
2answers
45 views

What are the implications of driving through flood water when I have a high air intake?

My 2003 Opel Agila 1.2 Petrol, has a high air intake. Here is the approximate location of it: [ Here is the engine bay, showing the air intake on the left. Is the height of the bottom of the ...
1
vote
1answer
25 views

what engine came in 2007 chevrolet avalanche LTZ?

I have a 5.3 Liter engine from a 2007 Chevy Avalanche LTZ. I removed it and swapped in a 6.0 for a customer. What is the name given to this V8? It has an aluminum block and cast 243 heads. I need to ...
1
vote
0answers
17 views

2000 Toyota Celica GT stalls with acceleration few minutes after starting

I have a 2000 Toyota Celica with about 180k miles. When my car has been off for a few hours and I try to start it up, if I try to press on the gas (either in drive, reverse, or park) within a few ...
2
votes
3answers
198 views

Why are most engines made with even numbers of cylinders?

Why are most engines made with even numbers of cylinders? Are odd numbers of cylinders somehow less efficient than even ones?
2
votes
1answer
46 views

ENGINE OIL BEEN FOUND IN THE RADIATOR

what could be the possible cause of oil leaking into the radiator when the engine is running. I have changed the O-rings on the oil cooler and pressure tested the cooler
0
votes
0answers
42 views

Losing power on acceleration and top end speed

I have a Big Boy GPR 250. When I ride the bike, I can feel a clear lack in power when accelerating. Also, revs are very low when riding at top end. I've also noticed my top end has lowered by 20kmph ...
1
vote
0answers
14 views

Changing Freeze Plugs on a Mazda 626

On a 98 Mazda 626 4 cylinder 2L engine where are the freeze plugs and how hard is it to replace them?
15
votes
6answers
54k views

What are the risks of overfilling a small engine with oil?

I recently overfilled a 4 stroke lawnmower engine with oil. It has been run for about 1.5 hours while overfilled. It smokes a lot right after being started but after 30 seconds or so the smoke clears. ...
0
votes
3answers
55 views

Do I have battery or engine problems?

Yesterday, I used my car to drive literally 2mins. Away from my dorm building to get to my class building and back because of bad weather. 30+mins. Later I come back outside and use my remote to ...
2
votes
2answers
45 views

Needle Going Wild in Engine Vacuum Test

My '96 Saab 900S has multiple symptoms, and I suspect multiple problems. For one thing, it gets the error code: P0422 Main Catalyst Efficiency Below Threshold (Bank 1) I made a video of my vacuum ...
2
votes
2answers
98 views

How long does items in the engine last in general for standard size cars?

I have a volkswagon passat wagon. It just reach 70000M and it is 2007 model. I recently check the engine at the dealership. Now they asked me to replace all the following items to fix engine overheat ...
2
votes
1answer
355 views

Car won't start problem

I have a problem with my car it won’t start. Just a little background on my car, I have a 2008 Nissan Versa and I have a cold air intake installed in my car with a hydro shield covering the air filter ...
-1
votes
0answers
17 views

Ford explorer 4.0L working battery engine wont turn over

After getting home last night I parked my car as usual. The next day I went to start it and nothing happens. All interior lights and Windows work so it's not the battery. Anyone have any idea what I ...
5
votes
2answers
556 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 ...
3
votes
1answer
38 views

How often to start/drive a vehicle to keep it healthy?

In order to keep a gasoline-powered vehicle healthy, how often does it need to be started or driven? Please specify if it actually needs to be driven, or if just starting it and letting it run is ...
0
votes
1answer
62 views

MG Rover Immobiliser removal

I have a 2003 MG Rover Streetwise, I need to remove or at least completely bypass the OEM Immobiliser. Driver door lock is broken due to attempted theft, so no point trying to enter the code, the key ...
2
votes
0answers
35 views

Engine Running Fast in Park

Never had this issue before but I just started my vehicle and the tac automatically revved up to 1500 rpm when I cranked it. It didn't go back down while in park, it basically idled at about 500 rmp ...
4
votes
2answers
113 views

What damages may I have caused draining oil by filter?

My ATV oil drain plug is an allen 6mm bolt. The bolt was all rusty, and what I expected to happen happened - I stripped it. Instead of wasting times trying to remove the stripped bolt I drained oil ...
2
votes
3answers
2k views

Why would welch plugs start leaking?

I have a VW Citi Golf, and the Welch plugs on the engine block suddenly started leaking water. The engine sounds fine, but it obviously leaked a lot of water and although I didn't drive far, I'm not ...
2
votes
0answers
42 views

Why is lugging hard on connecting rods?

I was researching the effects of lugging and came upon this thread, one of whose answers claims that lugging is really hard on the connecting rods. but without explaining why. Can you explain ...
1
vote
1answer
82 views

Why my bike shows petrol missing before 2000 RPM in all gears?

I am using Hero Karizma R (225cc, 5 gears). Recently I feel a missing in all gear befor 2000 RPM. Sometimes my bike turn off due to this missing. Usually it happens at 1st/2nd gears. After 2000 RPM ...
2
votes
0answers
19 views

Inconsistent warm engine tick sound in 2013 F-150

I'm the original owner of a 2013 Ford F-150 XLT 3.7 which now has 30,000 km. After the last oil change, the engine is making an inconsistent tick sound when warm and also vibrates a little. The ...
2
votes
2answers
69 views

Why use a 12-cylinder engine over a 8-cylinder engine

When I look at Laborghini Veneno and compare it for example to the Ferrari 458 Italia I can see that Lamborghini used a V12 while Ferrari placed a V8 inside the 458 Italia. I wonder why Lamborghini ...
6
votes
3answers
5k views

Coolant/antifreeze leaking out of engine block (See photo/video)

I'm not sure exactly what is going on with my vehicle ('98 Wrangler, 4.0L), but it's pretty obvious something is wrong. I think I might have had some minor coolant leaking after the past few times ...
3
votes
3answers
55 views

After five years in garage diesel car wouldn't start, what should be done?

One of my friends left his car in the garage since five years back and he has lived abroad since then. He left it with a full tank(its a diesel), and it ran perfectly well back then. Now he's back and ...
2
votes
2answers
48 views

Car wont turn over after trying to get it out of snow

I have a 1998 Mustang V6. Last winter I attempted to get it out of the snow on an inclined driveway. I revved it apparently too hard and the engine sputtered for a moment and stopped. Since then it ...
2
votes
1answer
634 views

my car acts like its going to stall at a stop

my car drives fine but when i come to a stop light or any stop it acts like it will stall but never does. did some easy things like oil change. no check engine light is on but it seems to keep ...
5
votes
3answers
2k views

Add 2 stroke oil to a 4 stroke petrol engine during burn-in period

I'm planning to get a new petrol (gasoline) car soon. A friend of mine, who worked as a motorbike mechanic when he was young, told me he puts a small quantity (125 ml / 4 oz) of 2 stroke oil in the ...
0
votes
1answer
50 views

Acceleration and engine issues

So I have a manual 02 Chevy Cavalier with 147000 miles 2.2L. I have been noticing that when I fully step on the gas I get zero acceleration. It gets even worse when I'm in either 4th or 5th gear after ...
3
votes
10answers
7k views

What can I do to give my lawn mower more power?

I have a 21" Craftsman push lawn mower with a Briggs and Stratton 7 hp engine that is about 6 years old. I've got it cutting on the highest setting, and it still has issues cutting the grass without ...
4
votes
2answers
434 views

Parking a motorcycle with hot engine

I have a question regarding my motorcycle (Yamaha FZ8 - 4Zylinder 800cc). At the weeksend I was driving through a town. It was very hot outside and I parked the bike. The coolingwater-temperature was ...
5
votes
2answers
243 views

Reboring a cylinder: compression ratio of new piston

I'm going to have the cylinder of my 2004 TT600RE motorcycle rebored (because it's damaged, not to increase power). The manual says the piston size is 95mm and the compression ratio is 8.5 : 1. I'm ...
2
votes
2answers
24k views

Rough Acceleration & ticking noise

Vehicle: 2000 Blazer 4WD Automatic 260,000+ miles (Runs perfectly if not for something going wrong every two weeks) Symptoms: Engine sounds rough when accelerating When accelerating there's a ...