RS2.... knocking engine starting from 2500rpm

[Avantus]

Hi all,

Went for a ride this evening in my RS2. Warmed it up for about 15 miles, and after that I gave it some go for 2 or 3 times. A friend jumped in, we drove off, and we both heard a ticking/knocking noise around a steady 2000rpm. Drove a little further, and while accelerating you couldn't hear it, only just when gently stepping of the gas, or holding it steady. Didn't dare to go over 3000rpm, because then it got louder and gave harder knocks...

Drove towards home verrrrry gently nog going above 2000rpm, and when I got home it had gotten a little bit worse. It knocks on just revving it a bit, and it still knocks badly starting from 3000 rpm.

Idle is perfect, oilpressure and level OK, oil itself looks OK, runs OK. It has had a rebuild about 10.000 miles ago, with the big end bearings having been replaced.

main bearings? bent rod? ...


bad video, but you get the idea. The knocks in real life are more 'metallic'.

http://www.youtube.com/watch?v=pnKNLbctqnc

thanks already!

[A80Avant]

could this be a lifter sound?

[nip]

Hi all,

Went for a ride this evening in my RS2. Warmed it up for about 15 miles, and after that I gave it some go for 2 or 3 times. A friend jumped in, we drove off, and we both heard a ticking/knocking noise around a steady 2000rpm. Drove a little further, and while accelerating you couldn't hear it, only just when gently stepping of the gas, or holding it steady. Didn't dare to go over 3000rpm, because then it got louder and gave harder knocks...

Drove towards home verrrrry gently nog going above 2000rpm, and when I got home it had gotten a little bit worse. It knocks on just revving it a bit, and it still knocks badly starting from 3000 rpm.

Idle is perfect, oilpressure and level OK, oil itself looks OK, runs OK. It has had a rebuild about 10.000 miles ago, with the big end bearings having been replaced.

main bearings? bent rod? ...


bad video, but you get the idea. The knocks in real life are more 'metallic'.

http://www.youtube.com/watch?v=pnKNLbctqnc

thanks already!

Check spark plugs sounds like 1 or more could be loose

[Avantus]

All 20 were replaced with the rebuild, and the knocking is much worser than on the crappy video (have heard bad lifters, and this is worse). I don't dare to get put it above 3000rpm again, but i can asure you that it gets really hard metallic knocking.

it gets the 'random' knocking like you can hear on this video:

http://www.youtube.com/watch?v=Z2rbmkzsY0M

[Avantus]

oh yes spark plugs already checked, all ok.

thanks for thinking with me all!

[Ross]

I wouldn't drive anywhere. In my Avant, i heard a noise like that for a matter of seconds before the bigend gave out, the rod snapped and the block was written off. Cause was a bigend bearing that had failed.

[Avantus]

Might be better to call my mechanic and let him pick it up tomorrow.

When driving gently with max 2000rpm (like i drove home with it for 15 miles) it doesn't make any sound however yet (at least not to be heard inside).

better safe than sorry I guess

thanks!

[terrybullwon]

If you could turn the motor by hand you will feel if its really bad.

[Ian Simmonds]

Our WR sounded almost identical to that, I convinced myself it was everything but the big end bearings....

And, I was wrong... No3 shells fell out the sump in 4 parts... Knackering the crank and the rod...

As above... Don't run it until you've dropped the sump pan to see what's happening.



See what I mean...

[Avantus]

will take that good advice, not starting it anymore

[GT500]

This was my noise, might help?



Thread here:

http://www.s2forum.com/forum/showthread.php?t=20541&highlight=RS2+engine

[URQguy]

Transmissions can sometimes make "knock" sounds that sound like engine knock. This probably is not the case, but get it on a lift and isolate the noise before you rip into it.

[Avantus]

Thanks GT500, good idea to have the oilpump checked too! On video it sounds pretty much the same. Did it also get even worse at higher revs?

My mechanic came this morning (what a service!) and he certainly thinks it's something from the bottom end.
When started cold it didn't do it for the first 20sec. I could rev it up to 2-3000 rpm without really hearing anything. Above 3000 it came back. When it warmed up a bit after a few minutes, it got back to like it was yesterday evening.

He's picking it up on monday or tuesday, and for starters he'll take off the sump and check play on the rods. I just hope the head doesn't need to come off.... just been done

Keep you guys posted, and thanks again!

[Avantus]

GT500, was your oilpressure still ok?

I had 1 bar on idle yesterday evening (oil at 90°C), but it climbed up ok till 4 bar when going to 2500-3000rpm.
Coldstart this morning was 5 bar, but I turned it off after letting my mechanic listening for a bit.

Possible that the oilpump makes such horrible metallic noises with still delivering ok oilpressure?

[A80Avant]

it should never be at 1bar
it should be at least at 1.8bar. on hot idle