Is it on its way out?

[Mark Halligan]

I have noticed that I have a knocking/tapping noise on acceleration, it doesn't last for long and doesn't happen all of the time. It mainly happens at part throttle but and never at full throttle. Strangely I can only hear it with all the windows closed and never open.......actually thats not suprising as it is probably drowned out by the intake suction, dump valve and exhaust noises anyway!
Oil (Castrol 10W60) pressure is good, 2bar at idle and 4.5 - 5bar at the higher rpm's, I've just spent the last two hours tooling about in it, and the car still goes like the Starship Enterprise.

Could this be the big ends or mains going South, maybe 1.9 bar boost and 1.6 at redline has taken its toll.

What does it sound like when the 'ends' start going?

I really need this like a hole in the head at the moment .

Cheers,

Mark.

[Doug_RS2]

Mark - I hope it is something stupid like a heatshields rattling under the car - don't take the engine to bits for a look - you'll never stop changing bits

[A6 AVANT]

Hiya Mark, Don't want to worry you but if this knocking/tapping sound is big/little ends/piston slap etc. you don't want to end up with a conrod throught your block! Might be worth examining before you do some serious damage and being off the road for a long time!
Hope it's something simple,
Regards
Chris

[Graham]

Could it be something as stupid as loose spark plugs?:confused:
Hope it isnt too serious
Graham

[horvathg]

Is Xanax available in Britain? It is a modest sedativum. because there is nothing more annoying than what you hear and dont know the reason for. I hope it is just your screwdriver that you left under the bonnet when you chenged your oil last time.

Gabor

[Mark Halligan]

I've had a look and I cant see anything that could be making the noise, so I dont know.
I have it in my head to build a short block now, I have an ABY, can anyone tell me if I can use a 3B block and crank, are they compatable, could I use one of these if I cant find an ABY,ADU,AAN block?
The only donor parts I would be using is the block, crank, flywheel and front pulleys, I know the flywheel is lighter than the dual mass ABY so that would be a bonus.
I use the car daily so I cant really afford to have the engine out for too long so it will be easier but more expensive to rebuild another short block, and put my new cylinder head on that.

Happy days .

Mark.

[Beetie]

I know that allaudi have a block for around 450+vat. As far as im aware they are the same, the aby differing as its got a blanking plate for the dizzy. Going on my experiences at the minute i wouldnt want to blow mine up again so id get it checked out somewhere just for peace of mind... Annoying isnt it!

[newsh]

AFAIK the 3B flywheel won't work with the 6 speed.

[Beetie]

can the aby flywheel be fitted to the 3B block though....

[porkkis]

Originally posted by Mark Halligan
I have it in my head to build a short block now, I have an ABY, can anyone tell me if I can use a 3B block and crank, are they compatable, could I use

Yes but no. Or perhaps
The 3B block misses few threads and holes for the newer style timing belt tensioner. They could probably be drilled on a 3B block if using good measurements. Otherwise no problems. I did this the other way and naturally the few extra holes weren't a problem of anykind.

You could use AAN from urS4/S6 without any need of modifications.

And AFAIK the s2 6 spd box fits perfectly to the 3B but there are different types of 6 speed boxes. Other have shorter and other longer main shafts.

Note when mixing components from different engines that you have to balance the crank+flywheel assy as one.

[Mark Halligan]

Porkis,

thanks for that, I hadn't thought about the timing belt tensioner.

Considering all the extra hassle this is going to give me now to have to do this, I will get the whole rotating assembly balanced as one, especially considering what I plan to do to it (with Mihneas help ) once its run in .

Cheers m8,

Mark.