over cammed

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20:06 Jul 1, 2018
English to Polish translations [PRO]
Tech/Engineering - Automotive / Cars & Trucks
English term or phrase: over cammed
What engines do respond to is a whole raft of changes which improve volumetric efficicncy, such as a modified cylinder head,
better carburation, better exhaust system and a better ignition system to ignite the charge at the correct time in the cycle.
The actual point of ignition (degrees BTDC) that the ignition is actually fired at must be one of the least considered aspects of many high performance engines,
but one that causes a huge power loss if not right! (see ‘Tlow to Build & Power Tune Distributor-Type Ignition Systems" by Des Hammill from Veloce Publishing). One problem that causes an engine to end up 'over cammed’ is the fact that all high performance camshafts cost a similar amount, so the mistaken idea of getting maximum duration for the money seems to prevail.
Local time: 07:35

Summary of answers provided
4za ostry wałek rozrządu
3wałek rozrządu ze zbyt długim czasem otwarcia zaworu
Frank Szmulowicz, Ph. D.



1 hr   confidence: Answerer confidence 3/5Answerer confidence 3/5
wałek rozrządu ze zbyt długim czasem otwarcia zaworu

street use because it produces so little power at low RPM, causing poor drivability. (See What's a 3/4 Race Cam?)

In order to gain power with a high performance (longer duration) camshaft, you must have an engine which is capable of reaching the higher RPM levels. For example, no matter how much duration you have, a stock Model T motor is never going to turn 5,000 RPMs. To achieve higher engine speeds you must have a head and manifold that will flow freely and a high enough compression ratio.

As an example, a stock Model T has a 4:1 compression ratio, poor air flow and a poor head design. Several years ago, we discovered that all of the reground camshafts available were too big, i.e. too much duration. This is called overcamming an engine - a very common mistake when building an engine (see Monroe). One dyno test showed that a stock cam (218 degrees duration) produced the same peak horsepower and up to 15% more midrange power. The midrange power is extremely important for driveability with only two forward gears.

Note added at 2 hrs (2018-07-01 23:03:15 GMT)

Po angielsku się też mówi o aggressive camshaft, czyli o wałku z agresywnymi krzywkami, więc overcammed byłoby ze zbyt agresywnymi krzywkami.

Frank Szmulowicz, Ph. D.
United States
Local time: 01:35
Specializes in field
Native speaker of: Native in EnglishEnglish, Native in PolishPolish
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22 hrs   confidence: Answerer confidence 4/5Answerer confidence 4/5
za ostry wałek rozrządu

Skoro autor używa nieprecyzyjnego kolokwializmu, to należy pozostać przy nieprecyzyjnym kolokwializmie.


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