knocking noise when idle

CharlesY said:

Gosh, each valve operates every THIRD revolution!

I thought these were FOUR stroke engines, but clearly I am wrong because

Mr DiscoTDi makes it clear these are SIX stroke cycle engines ....

Let me see .... suck .... squeeze ... bang .... blow ... and another two.

Beats me.

CharlesY

Click to expand...

mmm, all I said was each valve opens every third revolution ?

It's a bit complicated I know, so I'll go slowly :

commence 1st revolution
Induction
Compression

commence 2nd revolution
Power
Exhaust

commence 3rd revolution
Induction
Compression
and so on....

Basic stuff I would have thought.

Also you seem to think that if the engine was a six cylinder then this would be OK, which is somewhat strange, as the number of times a valve is depressed per revolutions of the crankshaft is the same regardless of the number of cylinders. Using your logic an eight cylinder engine would operate a given valve 4 times for every two revolutions which is novel.

DiscoTDi said:

mmm, all I said was each valve opens every third revolution ?

It's a bit complicated I know, so I'll go slowly :

commence 1st revolution
Induction
Compression

commence 2nd revolution
Power
Exhaust

commence 3rd revolution
Induction
Compression
and so on....

Basic stuff I would have thought.

Also you seem to think that if the engine was a six cylinder then this would be OK, which is somewhat strange, as the number of times a valve is depressed per revolutions of the crankshaft is the same regardless of the number of cylinders. Using your logic an eight cylinder engine would operate a given valve 4 times for every two revolutions which is novel.

Click to expand...

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regards

Dave