Chimeara V8 knocking when hot

[malloryn]

Had this since I've had the car (TVR chim 4ltr RV8.
When the engine is hot and idling there is a knocking sound coming from the engine, top end towards the bulkhead. Putting on a few revs, it goes away and is never present when cold. The sound is almost like very bad piston slap and does seem to tie in with engine revs.

The milage is 80,000 miles plus and as far as I know is still on its first timing gear set. I have heard things about the back of the cam not getting as much oil as the front. Could this be someting like cam bearing wear at the back?

The engine hot would mean either someting is expanding or the oil is thinning.

Anyone experienced with the RV8's?

[350zwelgje]

As you mentioned, piston could cause the noise.
But as the RV8 uses cilinder liners in the alloy block, it could be that a liner became loose. It is rare, but not unkown to happen.

A camshaft bearing causing this sound seems unlikely to me.

You mentioned a knocking sound, so this would eliminate a ticking sound that could indicate excessive wear on a pushrod, follower, rocker.


Rob (TVR 350i)

[kevinday]

It does sound like time for a rebuild I'm afraid. In my experience it is normally front end cam problems I have had 2 RV8s with ticking from front end, both in excess of 80K miles).