Engine knocking
 

Afternoon one and all, i'm after a bit of help.
Can anyone tell me what would be making this knocking noise from the head before i start tearing into it? My initial thoughts are the rockers.

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Cheers

Tom

That is a small person trapped in your engine bay sending morse code messages

Weird sound

Shouldn't be, De dwarfed it not 3 months ago!

Use a mechanics stethoscope and you should be able to locate it.

-Brian.

Its weird as its inconsistent, not a tap, tap, tap

Similar (although louder and more prominent) to the noise mine makes. Seems to be a normal piston slap noise when cold, consensus of the many people who listened to it. It's never been as loud as yours though.

Have been able to narrow it down to the head using the age old screwdriver on ear technique. It only does it when warm, quiet as a mouse when cold.

I might get flamed but it could be TCT timing chain tensioner, mine was not too dissimilar and it was fine when cold

I had a similar noise. Could only be heard when the engine was hot.

Oil pump was faulty and the little ends were rattling. Engine had done 17k miles and was replaced under warranty.

Mine makes a similar noise when revs drop below 900 rpm when the engine is cold on a cold (sub 5c) day.

Cannot be heard once warmed up. My engine has 107k but had a new oil pump at 99k.

Have you taken the rocker cover off? Just to check there is nothing loose in there?

I guess you could also try a thicker oil which if that solves it would indicate bearing wear.

Have you checked the valve clearances?
Nice to see another ITB setup btw :)

Have you also checked the tensioner pulley / bearings?

Going to whip the cover off this weekend and see if I can see owt, I do have some cams to throw in it so will rebuild the head when I do that. If it still knocks then poo...
I may order an oil pump

Flanders - the itb's are fantastic!

:thumbup:

I can't remember exactly how mine sounded, but it's worth checking these.

The Engine in my old S2000 used to make the exact same noise, A lot of people over in the US also used to and still do have the same noise and there are many threads on it.

I found the noise changed if you pulled out the coils one by one, suggesting that it is a piston/bottom end related noise

No one actually knows for sure what it is but the majority think it is Piston Slap as it is only there at Idle. I worried about it for months with my last car and eventually just decided that its not worth worrying anymore. Lots of people said that had they have had the noise for years, but i have never seen any threads say that the noise resulted in any engine failure.

Also out of interest what year is your engine?

Ill try to find some of the threads.

Have a read of this: https://www.s2ki.com/s2000/topic/110...age__hl__knock

Cheers fella, I will have a read of that thread tonight.
Car's a 99 but had a spoon bottom end put in in 2004.

I think it could be in head as it was first apparent after we re fitted the head a couple of years ago, I had completely forgotten about it till my mate told me last night.