Questions tagged [engine-theory]
Use this tag when asking questions about the theory of engines. Do NOT use for practical problems, only theoretical questions
423 questions
0 votes
1 answer
35 views
Theoretical question
I have been told that there should be no electrical continuity between a running engine crankshaft and the engine block. In other words, the cranks should be running on an oil film that would ...
3 votes
5 answers
1k views
I'm having a hard time intuiting throttle position to engine rpm consistency between gears -- why do cars behave in this observed way?
When I drive, I typically allow my auto-stick to handle the gearing. Occasionally, I'll put it in sport mode and manually handle the gearing myself. When I do this, I sometimes forget to take it out ...
- 1,180
4 votes
2 answers
1k views
What are the potential effects on the engine if water is added to gasoline or petrol?
Due to heavy rainfall, my motorcycle was parked outside and rainwater may have entered the fuel tank. Although the engine started initially, it stopped after running for a short time. what happens ...
- 169
1 vote
1 answer
196 views
Piston ring wear and gap
I have few questions about rings, their wear and their gap. What makes the worn ring "worn". Is it the ring gap that widens when ring wears down? Or is it mostly the edges of the rings that ...
- 41
0 votes
1 answer
62 views
Inertia force balancing of 6 cylinder engine
There are different types of IC engines. A 6-clinder engine is considered to be fully balanced for all inertia forces and couples due to reciprocating masses. What is the specific order of firing ...
0 votes
1 answer
180 views
Can I drive without changing my engine oil for an extended period?
Is it possible to continue driving my Honda Civic without changing the engine oil for an extended period, and how does this affect engine performance, potential damage to the engine, or overall ...
- 169
0 votes
1 answer
105 views
What are differences between power curve of turbo vs NA engine?
What are differences between power curve of turbo vs NA engine? At operating window at max power, which engine have more area under curve? If we look at both engine with same peak power.
- 111
0 votes
2 answers
693 views
Why aren't we using compressed air cars?
Today cars are predominantly powered by an internal combustion engine burning liquid fuels, electricity from a battery or both. Niche cars may use compressed methane or compressed hydrogen. Electric ...
- 15.6k
0 votes
2 answers
134 views
Does increase of effective compression ratio increase thermal efficiency?
Does increase of effective compression ratio increase thermal efficiency of a turbo engine or does efficiency only depend on static compression ratio? Is high effective compression ratio a reason why ...
- 111
1 vote
2 answers
174 views
How turbo engines increase efficiency if have lower compression ratio than naturally aspirated engines?
I know that efficiency depends on compression ratio(CR), NA engines always has higher CR than turbos,so how turbo engine can have better thermal efficiency? Please explain using Otto cycle, how ...
- 111
0 votes
1 answer
670 views
How Long Can I Drive A Car Without Coolant?
Ive been driving without coolant for some time. Just noticed there wasn't any in there. Car runs fine and never noticed it was empty. I filled it back up. No leaks. Should I be extra cautious get my ...
- 169
1 vote
1 answer
312 views
What does the crankcase breather do?
I have seen multiple Honda motorcycles list "crankcase breather" cleaning as a regular maintenance item. It involves just emptying out the oil collected in a small reservoir tied to a hose. ...
- 473
1 vote
1 answer
95 views
working engine temperature oil vs coolant
When we say that the car must be at working temperature, i.e. (90 C, 194F) is this temperature that of the coolant or the oil? Thanks.
- 127
1 vote
2 answers
142 views
Can LPG be used as fuel for cars?
I have a petrol engine car but I want to know that can I use LPG as a fuel for my petrol engine. I know I have to do customization for it but can I use LPG in a normal Petrol engine or does it affect ...
- 169
0 votes
1 answer
443 views
Is it possible to run a car without a carburetor?
Is it possible to run my car without a carburetor, or will doing so cause damage and prevent it from running? Does it damage or wear anything? what actually happen to the car.
- 169