- Do cars lose horsepower with age?
You can get cars ‘compression tested’ where each individual cylinder is checked by the garage to see how much power goes to the engine and how much blows back down the sides of the cylinder (sorry if someone has already said this above, not read it all).
They will have a table that says what mark you car should hit.
Mine got a ‘very good rating for its age’ at around 200,000 miles. Its age at the time being around 16 years. Its loosing power now at 220,000 but not sure if thats the cylinders or some other issue messing stuff up a bit.Posted 7 years agoTuckerUKMember
IMHO, and FYI:
HP: mathematically calculated engine output using such variables as coefficients of friction, calorific value of fuel, etc etc.
BHP: engine crankshaft output measured on engine Brake (Dynamometer)
Then of course there is the output measured by rolling roads (Chassis Dynamometers), more accurate than a guess, but only just. Don’t believe it? take a car to as many rolling roads as you want, test in all different gears, wonder why no two results are the same? QED.
I guess the answer to the OPs question depends on many variables: quality of original engine (design and materials), expected service life, servicing, usage, etc.Posted 7 years ago
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