Engine Capacity and Power Relationship

Everything related to Machine problems, Balancing issues, Vibration / Thrust diagnostics & analysis, etc.
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IrfanAli
Posts: 3
Joined: 16 Jul 2010, 09:27
Area of interest: Mechanical Engineering

Engine Capacity and Power Relationship

Post by IrfanAli »

I wonder if there exists a relationship between engine capacity and its power. If not theoratically can we relate them by some rule of thumb.
mechcolor
Posts: 258
Joined: 17 May 2010, 18:05
Area of interest: Manufacturing Engineering

Re: Engine Capacity and Power Relationship

Post by mechcolor »

You are right, nothing such exists.
See this interesting link http://www.simetric.co.uk/si_cc2hp_data.htm
IrfanAli
Posts: 3
Joined: 16 Jul 2010, 09:27
Area of interest: Mechanical Engineering

Re: Engine Capacity and Power Relationship

Post by IrfanAli »

Actually the site compares various production automobile or marine applications. I am interested in the engine standing alone, forgetting the transmission, body structure and load.
arcpro
Posts: 356
Joined: 16 Apr 2010, 18:46
Area of interest: Manufacturing Engineering

Re: Engine Capacity and Power Relationship

Post by arcpro »

No direct relation.
A thumb rule which may work sometimes:
1 horsepower with one cubic inch of capacity.
ibrahim
Posts: 80
Joined: 19 Apr 2010, 14:25
Area of interest: Chemical Engineering

Re: Engine Capacity and Power Relationship

Post by ibrahim »

irfanali, CC basically represents the size of engine (combustion chamber) of any machine/car. For a constant "cc" engine, hp will change with change of fuel type, RPM, concentration of combustion air and fuel flow-rate.
acrpro is right in this regard. Anyhow, for gasoline as fuel, an optimum conversion of an average size car engine will be as follows;
15 ~ 17cc = 1 hp OR ~ 1 cu.in. = 1 hp
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